CN110566620A - Negative-stiffness unit-cell honeycomb vibration damping structure - Google Patents
Negative-stiffness unit-cell honeycomb vibration damping structure Download PDFInfo
- Publication number
- CN110566620A CN110566620A CN201910938290.7A CN201910938290A CN110566620A CN 110566620 A CN110566620 A CN 110566620A CN 201910938290 A CN201910938290 A CN 201910938290A CN 110566620 A CN110566620 A CN 110566620A
- Authority
- CN
- China
- Prior art keywords
- double
- damping structure
- energy consumption
- curved
- negative stiffness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000013016 damping Methods 0.000 title claims abstract description 24
- 238000005265 energy consumption Methods 0.000 claims abstract description 50
- 239000003190 viscoelastic substance Substances 0.000 claims abstract description 13
- 238000010146 3D printing Methods 0.000 claims abstract description 6
- 238000005516 engineering process Methods 0.000 claims abstract description 5
- 238000005452 bending Methods 0.000 claims description 41
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 claims description 26
- 238000003825 pressing Methods 0.000 claims description 8
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 claims description 4
- 229920000299 Nylon 12 Polymers 0.000 claims description 4
- 230000001413 cellular effect Effects 0.000 claims 4
- 229910003460 diamond Inorganic materials 0.000 claims 1
- 239000010432 diamond Substances 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 11
- 238000006073 displacement reaction Methods 0.000 description 8
- 210000004027 cell Anatomy 0.000 description 7
- 230000000452 restraining effect Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 239000012792 core layer Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000009102 absorption Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000009103 reabsorption Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000000110 selective laser sintering Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
- F16F7/121—Vibration-dampers; Shock-absorbers using plastic deformation of members the members having a cellular, e.g. honeycomb, structure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
- F16F7/128—Vibration-dampers; Shock-absorbers using plastic deformation of members characterised by the members, e.g. a flat strap, yielding through stretching, pulling apart
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
The invention discloses a negative-stiffness single-cell honeycomb vibration damping structure which is prepared by a 3D printing technology through a viscoelastic material and comprises an external energy consumption unit and a central energy consumption unit, wherein the whole structure is integrated and is symmetrical about the center. The invention is based on the viscoelastic material, when the external dynamic load is small, the energy is consumed mainly through the external energy consumption unit, and the vibration is isolated; when the load is large, the central energy consumption unit plays a role in bearing and consuming energy; the structure has high bearing capacity and double-stage energy consumption mutual conversion function under dynamic load, thereby improving the bearing capacity, the energy consumption and the reusability of the structure.
Description
Technical Field
The invention relates to the field of design of vibration damping devices, in particular to a negative-stiffness single-cell honeycomb vibration damping structure.
Background
The vibration is widely existed in nature, particularly for ships and ocean engineering structures, the vibration is harmful under most conditions, for example, excitation generated by mechanical equipment such as a diesel engine, a slurry pump and a water pump in an ocean platform is unavoidable, the duration is long, the excitation value is large, violent vibration is not easy to attenuate and is rapidly propagated in a high-rigidity structure, normal operation of the equipment is influenced, fatigue damage of the structure is caused, and the health of workers is harmed. Therefore, it is important to take effective measures to reduce the harmful vibrations. At present, the local vibration generated by the ocean platform on mechanical equipment is generally controlled passively, for example, a viscoelastic damping layer is laid on a bulkhead, but the traditional basic vibration isolation and damping structure not only has large mass, but also increases the overall rigidity of the structure to different degrees, so that the natural frequency of the structure is increased, and the control on the middle and low frequency vibration is not facilitated. Therefore, a light-weight, high-energy-absorption, high-rigidity vibration damping device is receiving more and more attention.
The traditional honeycomb sandwich plate consists of an upper layer of high-strength thin panel and a lower layer of high-strength thin panel and a honeycomb core layer sandwiched between the upper layer of high-strength thin panel and the lower layer of high-strength thin panel, and has the excellent performances of light weight, high strength, high rigidity, convenience in molding and the like. The honeycomb core layer generally adopts a hexagonal single cell structure, under dynamic load, the honeycomb wall bears compressive load, the stress rises rapidly, and after the critical pressure is exceeded, the honeycomb wall generates plastic deformation under the compressive and bending loads, and the structure is densified. Therefore, the traditional honeycomb plate structure absorbs energy through plastic buckling of cell walls, but the plastic buckling cannot be recovered, and the honeycomb plate is crushed after one-time energy absorption and cannot be reused, so that the energy reabsorption and the service life of the honeycomb plate are limited.
Disclosure of Invention
The invention provides a novel negative-stiffness single-cell honeycomb vibration damping structure aiming at the problems of the existing honeycomb plate. It can exhibit recoverable elastic buckling, can also bear large loads, and consumes a large amount of energy.
The purpose of the invention is realized by the following technical scheme:
A negative-stiffness single-cell honeycomb vibration damping structure is prepared by adopting a viscoelastic material through a 3D printing technology and comprises an external energy consumption unit and a central energy consumption unit, and the whole structure is integrated and is symmetrical about the center.
Further, the purpose of the invention can be realized by the following technical scheme:
the external energy consumption unit includes: the device comprises a pressing plate, a vertical connecting beam, a transverse outward-bending double-curved beam and two side upright columns, wherein the middle part of the pressing plate is connected with the top part of the transverse outward-bending double-curved beam through the vertical connecting beam, and the upper ends of the upright columns are connected with the end parts of the transverse outward-bending double-curved beam.
The central energy consumption unit includes: the energy-saving energy-consuming unit comprises a transverse restraint beam, a longitudinal inner-bending double-curved beam, a rhombic traction beam and a horizontal connecting beam, wherein the end part of the transverse restraint beam is connected with the end part of the longitudinal restraint beam, the upper end and the lower end of the longitudinal inner-bending double-curved beam are fixedly connected with the transverse restraint beam, the upper end and the lower end of the rhombic traction beam are connected with the middle part of the transverse restraint beam, the horizontal connecting beam is connected with the horizontal two ends of the rhombic traction beam and the middle part of the longitudinal inner-bending double-curved beam, and the transverse restraint beam is connected with upright columns.
the double-curved beam is a prefabricated stress-free double-curved beam and consists of a pair of parallel coupled curved beams in opposite directions, the shape of the double-curved beam is similar to that of a cosine beam, and two ends and the top of the double-curved beam are fixedly connected and are respectively tangent to the horizontal direction.
The length-to-height ratio K of the double-curved beam characterizes the curvature of the double-curved beam, and the curvature of the double-curved beam is designed to be 8< K < 12.
The top of the longitudinal inward-bending double-bending beam is arranged outside the upright posts on two sides of the external energy consumption unit.
The restraint beam is a variable-thickness beam with two wide ends and a narrow middle part.
The rhombic traction beam consists of a pair of triangular corrugated beams in opposite directions.
The triangular vertex angle of the triangular corrugated beam is 60 degrees, and the thickness of the rhombic traction beam is the same as the thickness t of the hyperbolic beam.
The viscoelastic material is nylon 12.
Principle of operation
When the energy dissipation device is used, the pressure plate of the external energy dissipation unit is respectively fixed with the isolation body and the isolated body, and the structure mainly generates a primary negative stiffness behavior generated by buckling of a transversely outward-bent hyperbolic beam of the external energy dissipation unit under a small vertical dynamic load, and corresponds to primary energy dissipation; when the load is continuously increased, the rhombic traction beam plays a certain bearing role; a part of load is distributed into the horizontal connecting beam, when the horizontal component is increased to the critical value of buckling of the longitudinal inward-bending double-bending beam, the transverse restraining beam bends towards the center, and the bidirectional characteristic of the compression motion of the rhombic traction beam is utilized to push the longitudinal inward-bending double-bending beam to buckle outwards to generate a secondary negative stiffness behavior, so that the secondary energy dissipation is realized; and in the unloading process, the structure is gradually restored to the original shape by virtue of the viscoelasticity of the material, so that a force-displacement hysteresis curve of the structure in one period is formed. According to the honeycomb wall single-cell structure, the function interconversion of the two units is realized through the rhombic traction beam, a larger load is borne, the structure can generate one-stage or two-stage energy dissipation under vertical dynamic loads with different sizes, middle and low frequency vibration is effectively isolated, the energy consumption capacity, the bearing capacity and the reusability of the structure are improved, and the problems that the traditional honeycomb plate cannot be recovered after plastic deformation and the common honeycomb wall single-cell structure with negative rigidity is low in bearing capacity and energy consumption capacity are solved.
Advantageous effects
The negative-stiffness single-cell honeycomb vibration damping structure is composed of an external energy consumption unit and a central energy consumption unit. When the vertical dynamic load is small, the transverse outward-bending hyperbolic beam of the external energy consumption unit of the structure is mainly bent to generate a primary negative stiffness behavior, and the primary negative stiffness behavior corresponds to primary energy dissipation; the load is continuously increased, and the rhombic traction beam of the central energy consumption unit has higher rigidity and can bear larger load; a part of load is distributed into the horizontal connecting beam, the rhombic traction beam is subjected to pressure two-way motion to push the longitudinal hyperbolic beam to buckle to generate a secondary negative stiffness behavior, and the secondary negative stiffness behavior corresponds to secondary energy dissipation; in the unloading process, the material viscoelastic structure returns along the original path to recover the original shape, and a force-displacement hysteresis curve is formed. In the whole process, the structure combines the external energy consumption unit and the central energy consumption unit by utilizing the rhombic traction beam, so that the function of high rigidity and double-stage energy consumption interconversion is realized, the whole structure has the advantages of light weight, high strength and high energy consumption, and in addition, the structure also has the advantages of simple type, convenience in manufacturing, rapidness in installation and the like, and middle and low frequency vibration can be effectively isolated.
The invention is based on the viscoelastic material, when the external dynamic load is small, the energy is consumed mainly through the external energy consumption unit, and the vibration is isolated; when the load is large, the central energy consumption unit plays a role in bearing and consuming energy; the structure has high bearing capacity and double-stage energy consumption mutual conversion function under dynamic load, thereby improving the bearing capacity, the energy consumption and the reusability of the structure.
Drawings
FIG. 1 is a front cross-sectional view of a structure of an embodiment of the present invention;
FIG. 2 is a schematic structural view of the doubly curved beam of FIG. 1;
FIG. 3 is a schematic structural diagram of the central energy consuming unit of FIG. 1;
FIG. 4 is a schematic structural view of the restraint beam of FIG. 1;
FIG. 5 is a schematic structural view of the draft sill of FIG. 1;
FIG. 6 is a plot of the hysteresis characteristics of a unit cell structure in an on-off cycle according to an embodiment of the present invention;
FIG. 7 is a plot of the hysteresis characteristics of a unit cell structure in an on-off cycle according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a side-by-side array of unit cell structures according to an embodiment of the present invention;
Reference numbers in the figures: 1-1, pressing a plate; 1-2, vertically connecting beams; 1-3, transversely bending the double-bent beam outwards; 1-4, upright columns at two sides; 2-1, a transverse restraint beam; 2-2, longitudinal restraint beams; 2-3, longitudinally bending the double-curved beam inwards; 2-4, a diamond-shaped traction beam; 2-5, horizontally connecting the beams.
Detailed Description
in order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and techniques are omitted so as to not unnecessarily limit the invention. The described embodiments are only some, but not all embodiments of the invention. The embodiments are illustrative, and are not to be construed as limiting, and all other embodiments that can be derived by one of ordinary skill in the art without making any inventive step are intended to be within the scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
in the description of the present invention, it should be understood that the terms "axial direction", "center", "lateral direction", "longitudinal direction", "length", "width", "thickness", "vertical direction", "horizontal direction", "upper direction", "lower direction", "left direction", "right direction", "inner direction", "outer direction", "top direction", "bottom direction", etc. indicate orientations or relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments and should not be construed as limiting the scope of the present invention.
In the present invention, the terms "connected", "connected" and "fixed" are fixedly and directly connected and integrated, unless otherwise specifically defined and limited. A first feature may be directly on or directly under or directly to the second feature or indirectly on or directly between the first and second features via intervening elements, that is, the first feature may be oriented "above" or "below" or "left" or "right" or "between the second feature.
The embodiment relates to a negative-stiffness unit cell honeycomb vibration damping structure which is prepared from a viscoelastic material. Nylon 12 has the advantages of good performance, high molding rate and proper price as a typical viscoelastic material, and the 3D printing process has good integrity, is simple and quick, and therefore, nylon 12 is preferably prepared by a 3D printing technology (selective laser sintering, SLS).
As shown in fig. 1 to 6, the negative-stiffness single-cell honeycomb vibration damping structure is prepared by a 3D printing technology using a viscoelastic material and includes two parts, namely an external energy consumption unit and a central energy consumption unit. When the viscoelastic material is subjected to alternating load, the viscoelastic material shows a hysteresis effect due to asynchronous stress strain, so that the structure generates energy loss and has recoverability.
the external energy consumption unit includes: the device comprises a pressing plate 1-1, a vertical connecting beam 1-2, a transverse outward-bent double-curved beam 1-3 and upright columns 1-4 on two sides; the pressing plate 1-1 is an element for bearing external load, the transverse outward-bent double-bent beam 1-3 is an external negative rigidity element, the vertical connecting beam 1-2 is an element for transmitting external load, the pressing plate 1-1 and the top of the transverse outward-bent double-bent beam 1-3 are directly connected, and the upper end of the upright post is connected with the end part of the transverse outward-bent double-bent beam.
The central energy consumption unit comprises: 2-1 parts of transverse restraint beams, 2-2 parts of longitudinal restraint beams, 2-3 parts of longitudinal inner-bending double-curved beams, 2-4 parts of rhombic traction beams and 2-5 parts of horizontal connecting beams; the transverse restraint beam 2-1 is connected with the end part of the longitudinal restraint beam 2-2 and surrounds the outer side of the central energy consumption unit to play a role in restraining and keeping the negative rigidity of the double-curved beam; mainly prevents horizontal/vertical expansion of the transverse/longitudinal double-curved beam in the compression process and effectively keeps the negative rigidity behavior of the double-curved beam. The upper end and the lower end of the longitudinal inward-bending double-bent beam 2-3 are fixedly connected with the transverse restraint beam 2-1 and are central negative stiffness elements, the working mechanism of the central negative stiffness elements is the same as that of the transverse outward-bending double-bent beam 1-3, and the energy dissipation effect is achieved; the upper end and the lower end of the rhombic traction beam 2-4 are connected with the middle part of the transverse restraint beam 2-1, and are bearing and motion direction conversion elements of the structure, so that the vertical motion of the structure can be converted into horizontal motion, and the longitudinal inward-bent double-bent beam 2-3 is pushed to be bent outwards to generate secondary negative stiffness behavior. The horizontal connecting beams 2-5 are connected with the horizontal two ends of the rhombic traction beams 2-4 and the middle parts of the longitudinal inward-bent double-bent beams 2-3. The central energy consumption unit 2 is connected with the upright columns 1-4 at the upper side and the lower side of the external energy consumption unit through the transverse restraint beams 2-1. The whole structure is integrated.
The double-curved beam is a prefabricated stress-free double-curved beam and consists of a pair of parallel coupled curved beams in opposite directions, the shape of the double-curved beam is similar to that of a cosine beam, and two ends and the top of the double-curved beam are fixedly connected and are respectively tangent to the horizontal direction. The double-curved beam is used as a negative stiffness element of the structure and mainly plays a role in energy consumption. When the vertical dynamic load is small, the transverse outward-bending hyperbolic beam of the external energy consumption unit is mainly buckled to generate a primary negative stiffness behavior, and the primary negative stiffness behavior corresponds to primary energy dissipation; and the load is continuously increased, the rhombic traction beam bears and pushes the longitudinal inner-bending hyperbolic beam of the central energy consumption unit to buckle to generate a secondary negative stiffness behavior, and the secondary negative stiffness behavior corresponds to secondary energy dissipation. The both ends and the top of two bent beams are tangent with the horizontal direction, and the perpendicular distance of the top of roof beam to both ends point horizontal line is bent beam top height h, and bent beam's thickness is t, according to having the analysis: when the height-thickness ratio Q (Q ═ h/t) >2.3 of the bending beam, the bending beam can generate obvious negative stiffness behavior; because the second-order buckling in the buckling process of the bending beam can affect the bearing capacity of the structure and weaken the negative stiffness behavior, the second-order buckling can be limited by applying two parallel coupling bending beams and fixedly connecting the middle part and two ends of the two parallel coupling bending beams, so that the double-bending beam is suddenly changed from the first-order buckling form to the first-order buckling form in the opposite direction under dynamic load, namely the double-state sudden change, which is reflected on a force-displacement curve: the value of the force is firstly increased to the maximum along with the increase of the displacement, then the hyperbolic beam bends, the force is reduced along with the increase of the displacement, a negative stiffness region appears, and when the hyperbolic beam bends to an initial form in the opposite direction, the force is increased along with the increase of the displacement in the opposite direction.
in addition, the structure is optimally designed to obtain the following results: the length-to-height ratio K (K is L/h) of the double-curved beam represents the curvature of the double-curved beam, the curvature is small, the bearing capacity is large, the curvature is large, but when the curvature is too small, obvious third-order buckling is easily generated in the compression process, namely, the shape similar to two peaks appears when the double-curved beam deforms, and adverse effects can be generated on the recovery of structural deformation during unloading; conversely, if the curvature is too large, the negative stiffness is not significant, and the energy consumption is low. Therefore, the curvature of the double-curved beam is designed to be 8< K <12, the bending state of the double-curved beam is the best, and the bearing capacity and the negative rigidity can reach the optimal values. The top of the longitudinal inner-bending double-curved beam is arranged outside the upright columns on two sides of the external energy consumption unit, preferably, the top is arranged 3-5mm away from two ends of the transverse upper and lower layers of outer-bending double-curved beams, and the influence on the buckling of the inner side beam of the longitudinal double-curved beam when the transverse restraining beam bends downwards is mainly prevented.
The restraining beam is used as a restraining element of the end force of the double-curved beam, and plays a role in preventing the double-curved beam from horizontally/vertically expanding in the compression process and keeping the negative rigidity behavior of the double-curved beam. The transverse restraint beam 2-1 provides restraint for horizontal expansion of the transverse outward-bent double-bent beam 1-3; the longitudinal restraint beam 2-1 provides restraint for vertical expansion of the longitudinal inturned doubly curved beam 2-3. By optimizing the design, the restraint beam of the embodiment adopts a variable thickness beam with two wide ends and a narrow middle part, as shown in fig. 4.
The longitudinal inner-bending double-curved beam is connected with the two horizontal ends of the rhombic traction beam through the horizontal connecting beam and is surrounded by the horizontal and longitudinal restraining beams; the vertical two ends of the rhombic traction beam are connected with the middle part of the transverse restraint beam.
the rhombic traction beam consists of a pair of triangular corrugated beams in opposite directions. The rhombic traction beam is used as a bearing and movement direction conversion device of the structure, and has higher rigidity on one hand; on the other hand, a part of vertical compression load is divided into the horizontal connecting beam, the two-way moving performance is realized by combining the compression of the rhombic traction beam, the longitudinal inward-bending hyperbolic beam is pushed to bend outwards to generate a secondary negative stiffness behavior, the function of mutual conversion between primary energy consumption of the external energy consumption unit and secondary energy consumption of the central energy consumption unit is realized, and the bidirectional moving load is mainly used as a bearing and motion conversion element of a structure. Preferably, the triangular vertex angle of the triangular corrugated beam is 60 degrees, and the thickness of the rhombic traction beam is the same as the thickness t of the hyperbolic beam.
When the structure is pressed, a force-displacement curve is shown in fig. 6, and the specific expression is that when the load is small, the external energy consumption unit is bent through the transverse outward bending double-bent beams 1-3 to generate a primary negative stiffness behavior; when the load is continuously increased, the middle part of the transverse outward-bent double-curved beam 1-3 is contacted with the transverse restraint beam 2-1, and the rhombic traction beam 2-4 connected with the transverse restraint beam 2-1 is pressed to bear a certain load; along with load is distributed into the horizontal connecting beams, the transverse restraining beam 2-1 bends downwards, the traction beam 2-4 is pressed to move in two directions, and the horizontal connecting beams 2-5 on two sides are pushed to move transversely, so that the longitudinal inward-bending double-bending beam 2-2 bends outwards to generate a secondary negative stiffness behavior; during unloading, the original shape of the structure is restored by means of the viscoelasticity of the material, a force-displacement hysteresis curve is formed, double-stage energy consumption is achieved, and meanwhile the bearing capacity of the structure is improved.
The invention has the advantages that: based on the viscoelastic material, when the external dynamic load is small, energy is consumed mainly through an external energy consumption unit to isolate vibration; when the load is large, the central energy consumption unit plays a role in bearing and consuming energy; the structure has high bearing capacity and double-stage energy consumption mutual conversion function under dynamic load, thereby improving the bearing capacity, the energy consumption and the reusability of the structure.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and the double curved beams with different height-thickness ratios Q, widths b, and curvatures K can be prepared according to actual needs, and the single cell structure can be elongated according to the needs, or arranged in parallel to form a honeycomb shape similar to that shown in fig. 7, so that the novel negative stiffness single cell honeycomb damping structure can meet the bearing capacity and energy consumption needs of different fields.
Any equivalent embodiments that may be changed or modified into equivalent variations by those skilled in the art can be applied to other fields without departing from the technical scope of the present invention, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical scope of the present invention.
Claims (10)
1. The negative-stiffness single-cell honeycomb vibration damping structure is characterized in that viscoelastic materials are adopted to be prepared through a 3D printing technology, the structure comprises an external energy consumption unit and a central energy consumption unit, and the whole structure is integrated and is symmetrical about the center.
2. The negative stiffness unit cell cellular damping structure of claim 1, wherein the external energy dissipating unit comprises: the device comprises a pressing plate, a vertical connecting beam, a transverse outward-bending double-curved beam and two side upright columns, wherein the middle part of the pressing plate is connected with the top part of the transverse outward-bending double-curved beam through the vertical connecting beam, and the upper ends of the upright columns are connected with the end parts of the transverse outward-bending double-curved beam.
3. the negative stiffness unit cell cellular damping structure of claim 1, wherein the central dissipative unit comprises: the energy-saving energy-consuming unit comprises a transverse restraint beam, a longitudinal inner-bending double-curved beam, a rhombic traction beam and a horizontal connecting beam, wherein the end part of the transverse restraint beam is connected with the end part of the longitudinal restraint beam, the upper end and the lower end of the longitudinal inner-bending double-curved beam are fixedly connected with the transverse restraint beam, the upper end and the lower end of the rhombic traction beam are connected with the middle part of the transverse restraint beam, the horizontal connecting beam is connected with the horizontal two ends of the rhombic traction beam and the middle part of the longitudinal inner-bending double-curved beam, and the transverse restraint beam is connected with the lower ends.
4. The negative stiffness unit cell honeycomb vibration damping structure according to any one of claims 2 and 3, wherein the doubly curved beam is a prefabricated stress-free doubly curved beam, and is composed of a pair of parallel coupled curved beams with opposite directions, the shape of the doubly curved beam is similar to that of a cosine beam, and two ends and the top of the doubly curved beam are fixedly connected and are respectively tangent to the horizontal direction.
5. The negative stiffness unit cell honeycomb damping structure of claim 4, wherein a length to height ratio K of the doubly curved beam characterizes a curvature of the doubly curved beam, the curvature of the doubly curved beam being designed to be 8< K < 12.
6. the negative stiffness unit cell damping structure of claim 3, wherein the top of the longitudinally inner bent double curved beam is outside the pillars on both sides of the external dissipative unit.
7. The negative stiffness unit cell honeycomb vibration damping structure of claim 3, wherein the restraint beam is a variable thickness beam with two wide ends and a narrow middle.
8. The negative stiffness unit cell cellular damping structure of claim 3, wherein the diamond shaped drag beam is comprised of a pair of triangular corrugated beams in opposite directions.
9. The negative stiffness unit cell honeycomb vibration damping structure according to claim 8, wherein the triangular vertex angle of the triangular corrugated beam is 60 degrees, and the thickness of the rhombic traction beam is the same as the thickness t of the hyperbolic beam.
10. The negative stiffness cell cellular vibration damping structure according to any one of claims 1, 2, 3, 6, 7, 8, 9, wherein the viscoelastic material is nylon 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910938290.7A CN110566620B (en) | 2019-09-30 | 2019-09-30 | Negative rigidity single cell honeycomb vibration reduction structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910938290.7A CN110566620B (en) | 2019-09-30 | 2019-09-30 | Negative rigidity single cell honeycomb vibration reduction structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110566620A true CN110566620A (en) | 2019-12-13 |
| CN110566620B CN110566620B (en) | 2024-09-20 |
Family
ID=68783463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910938290.7A Active CN110566620B (en) | 2019-09-30 | 2019-09-30 | Negative rigidity single cell honeycomb vibration reduction structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110566620B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111102319A (en) * | 2020-01-17 | 2020-05-05 | 北京理工大学 | Low-frequency vibration isolation superstructure |
| CN112623109A (en) * | 2020-12-14 | 2021-04-09 | 中国海洋大学 | Vibration-damping sandwich beam and vibration-damping deck frame |
| CN113565908A (en) * | 2021-07-23 | 2021-10-29 | 中国工程物理研究院机械制造工艺研究所 | Repetitive memory alloy energy absorption structure and preparation method thereof |
| CN114658782A (en) * | 2022-03-24 | 2022-06-24 | 大连理工大学 | Bidirectional buffering energy-absorbing metamaterial with enhanced performance |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150014510A1 (en) * | 2011-09-15 | 2015-01-15 | Mapper Lithography Ip B.V. | Support module for lithography system |
| US20160032997A1 (en) * | 2014-08-01 | 2016-02-04 | Board Of Regents, The University Of Texas System | Negative stiffness honeycomb material |
| CN105774052A (en) * | 2016-03-16 | 2016-07-20 | 邓安仲 | Sandwich composite material of column cell structure formed by multilayer overlay of curved bodies |
| US10081391B1 (en) * | 2017-07-31 | 2018-09-25 | Ford Global Technologies, Llc | Bi-rectangular vehicle beam with cellular structure |
| CN109024385A (en) * | 2018-09-20 | 2018-12-18 | 华侨大学 | A kind of highway safety protective fence |
| CN210978325U (en) * | 2019-09-30 | 2020-07-10 | 中国海洋大学 | Negative-stiffness unit-cell honeycomb vibration damping structure |
-
2019
- 2019-09-30 CN CN201910938290.7A patent/CN110566620B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150014510A1 (en) * | 2011-09-15 | 2015-01-15 | Mapper Lithography Ip B.V. | Support module for lithography system |
| US20160032997A1 (en) * | 2014-08-01 | 2016-02-04 | Board Of Regents, The University Of Texas System | Negative stiffness honeycomb material |
| CN105774052A (en) * | 2016-03-16 | 2016-07-20 | 邓安仲 | Sandwich composite material of column cell structure formed by multilayer overlay of curved bodies |
| US10081391B1 (en) * | 2017-07-31 | 2018-09-25 | Ford Global Technologies, Llc | Bi-rectangular vehicle beam with cellular structure |
| CN109024385A (en) * | 2018-09-20 | 2018-12-18 | 华侨大学 | A kind of highway safety protective fence |
| CN210978325U (en) * | 2019-09-30 | 2020-07-10 | 中国海洋大学 | Negative-stiffness unit-cell honeycomb vibration damping structure |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111102319A (en) * | 2020-01-17 | 2020-05-05 | 北京理工大学 | Low-frequency vibration isolation superstructure |
| CN112623109A (en) * | 2020-12-14 | 2021-04-09 | 中国海洋大学 | Vibration-damping sandwich beam and vibration-damping deck frame |
| CN113565908A (en) * | 2021-07-23 | 2021-10-29 | 中国工程物理研究院机械制造工艺研究所 | Repetitive memory alloy energy absorption structure and preparation method thereof |
| CN114658782A (en) * | 2022-03-24 | 2022-06-24 | 大连理工大学 | Bidirectional buffering energy-absorbing metamaterial with enhanced performance |
| CN114658782B (en) * | 2022-03-24 | 2023-02-10 | 大连理工大学 | Bidirectional buffering energy-absorbing metamaterial with enhanced performance |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110566620B (en) | 2024-09-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110566620A (en) | Negative-stiffness unit-cell honeycomb vibration damping structure | |
| CN210978325U (en) | Negative-stiffness unit-cell honeycomb vibration damping structure | |
| KR950031494A (en) | Resin shock absorber | |
| CN109094139B (en) | Novel structural honeycomb sandwich plate | |
| CN105799231B (en) | The core filled composite material of opposite hemispherical Shell scapus born of the same parents' structure | |
| CN213539880U (en) | Self-resetting energy dissipation support | |
| CN102116055A (en) | Energy dissipation and shock absorption mechanism | |
| CN108952281A (en) | A kind of U-shaped two stages surrender metal damper | |
| CN105774052B (en) | The core filled composite material of multiple-layer stacked curved surface scapus born of the same parents' structure | |
| CN109629896B (en) | Combined type double-yield buckling restrained energy-dissipation brace | |
| CN211622802U (en) | Friction compound type buckling restrained energy dissipation brace | |
| CN210369407U (en) | Building shock attenuation power consumption structure | |
| CN217871118U (en) | Double-stage energy consumption damper | |
| CN114673758B (en) | Drilling device based on positive and negative rigidity vibration reduction technology | |
| CN109990193A (en) | A kind of multistage concertina honeycomb | |
| CN110820977A (en) | Viscoelastic coupling beam damper with unidirectional shearing deformation | |
| CN114182843B (en) | Buckling restrained brace adopting W-M fractal function | |
| CN211172524U (en) | Energy dissipation shock attenuation allies oneself with limb shear force wall | |
| CN212295148U (en) | Assembled buckling restrained brace component with negative poisson ratio structure | |
| CN214461377U (en) | Self-resetting buckling-restrained brace with replaceable energy-consuming inner core | |
| CN113374108A (en) | Metal composite energy dissipater with double-order yield point for seismic isolation layer | |
| CN103711222B (en) | The anti-buckling spacing energy-consumption supporting member of baffled formula steel pipe I-shaped internal withdraw type variable cross-section inner core in a kind of | |
| CN103711221B (en) | The anti-buckling spacing energy-consumption supporting member of a kind of I-shaped variable-cross-sectisteel steel core of channel-section steel open flume type | |
| CN113622535A (en) | Self-resetting damper based on zinc-aluminum alloy and manufacturing method thereof | |
| CN112575677A (en) | Pier anti-collision facility with negative Poisson ratio effect and design method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |