CN115978131A - Parameter continuously adjustable self-resetting eddy current inertial mass damper for model stay cable vibration reduction test - Google Patents
Parameter continuously adjustable self-resetting eddy current inertial mass damper for model stay cable vibration reduction test Download PDFInfo
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- CN115978131A CN115978131A CN202310056831.XA CN202310056831A CN115978131A CN 115978131 A CN115978131 A CN 115978131A CN 202310056831 A CN202310056831 A CN 202310056831A CN 115978131 A CN115978131 A CN 115978131A
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Abstract
The invention provides a parameter continuously adjustable self-resetting eddy current inertia mass damper for a model stay cable vibration attenuation test, which is applied to the model stay cable vibration attenuation test. The ball screw mechanism and the conductor plate are respectively arranged in the damper frame, the upper side of the damper frame is provided with a linear bearing and a supporting spring, and the supporting spring realizes the self-resetting function of the damper. A mass flywheel is arranged outside a ball nut of the ball screw mechanism and used for adjusting inertia mass; the damper frame is provided with an electromagnet to generate an electromagnetic field; the conductor plate moves among the electromagnets to cut an electromagnetic field to generate equivalent damping force, and the damping coefficient is adjusted by changing the power supply current of the electromagnets. The invention can continuously and highly precisely adjust the inertial mass and the damping coefficient and relieve the technical problem in the stay cable vibration damping test of the existing model.
Description
Technical Field
The invention relates to the technical field of building vibration such as civil engineering, traffic and the like, in particular to a parameter continuously adjustable self-resetting eddy current inertial mass damper for a model stay cable vibration reduction test.
Background
A damper is a device that provides resistance to movement and dissipates the energy of the movement. Because of the energy absorption and vibration reduction functions, the energy absorption and vibration reduction composite material is widely applied to the industries of aerospace, aviation, war industry, guns, automobiles and the like. Since the seventies of the last century, researchers gradually apply dampers to the structural engineering fields such as buildings, bridges and railways, and for example, the external damper is a common way to be used in stay cable vibration control engineering.
The guy cable is used as a commonly used support structure in the civil engineering and traffic structure engineering field and has the defects of high flexibility, low damping, low frequency and the like, so that the guy cable is easy to greatly vibrate under the action of external excitation, such as wind and rain vibration, vortex-induced vibration and the like. Moreover, with the increase of the design length of the stay cable, the traditional passive viscous damper cannot meet the requirement of vibration reduction control of the current stay cable. The passive damper with negative stiffness characteristic has attracted the attention and research of students due to its high damping effect. The inertia mass damper is a novel passive damper with negative rigidity, and researches show that the energy consumption capacity of the inertia mass damper is far beyond that of a traditional viscous damper. However, most of the existing research on the inertial mass damper is in a theoretical simulation stage, and therefore, whether the damping effect of the stay cable is high or not needs to be tested and verified.
The scale test is an important research means for verifying theoretical hypothesis, can effectively verify whether the damping effect of the inertial mass damper on the stay cable is consistent with the theory, and usually needs to carry out high-precision continuous adjustment on the damper parameters in the scale test, otherwise, the obtained test result is easy to have larger error with the theoretical result, and the analysis of error cause also brings difficulty. At present, the method for adjusting the inertial mass of the inertial mass damper in the scale test mainly comprises replacing mass flywheels with different masses or sizes, such as "an eddy current inertial mass damper" (application publication No. CN 111321820A) and "a parameter-adjustable inertial mass damper for model stay cable vibration damping test" (application publication No. CN 108662072A) in the patent documents. The damping coefficient of the inertial mass damper is adjusted by changing the number, size, air gap and arrangement mode of the permanent magnets, such as a gear and rack type inertial capacitance eddy current damper (CN 115539545A) in the patent document; there are also viscous damping fluids with different viscosity coefficients, such as "a parameter adjustable inertial mass damper for model stay cable damping test" (application publication No. CN 108662072A).
However, the above damper parameter adjusting methods cannot really achieve high-precision continuous adjustment. The continuity of the inertia mass test parameters cannot be ensured by changing the mass or the size of the mass flywheel; and change the size, quantity and arrange of permanent magnet, or use viscous damping fluid of different viscosity coefficients not only can't guarantee the continuity of damping coefficient test parameter, still can bring complicated operation procedure and have the hidden danger of taking place the test accident for the experiment.
Disclosure of Invention
The invention aims to solve the problems, provides the self-resetting eddy current inertial mass damper with double parameters of inertial mass and damping coefficient continuously adjustable for the model stay cable vibration attenuation test, can be used for the model stay cable vibration attenuation test under multiple working conditions, solves the problem that the existing parameters cannot be continuously adjusted with high precision, and provides an effective means for verifying the vibration attenuation effect of the inertial mass damper. Therefore, the invention adopts the following technical scheme:
a parameter continuously adjustable self-resetting eddy current inertia mass damper for a model stay cable vibration attenuation test is characterized by comprising a damper frame, a ball screw mechanism, a mass flywheel, a conductor plate, an electromagnet and a linear bearing;
one end of a screw rod in the ball screw mechanism is connected with the model stay cable, and the other end of the screw rod is connected with the conductor plate; a ball nut and the conductor plate in the ball screw mechanism are arranged in a damper frame, and the ball nut is axially positioned;
the electromagnets are fixed on two sides of the damper frame, the conductor plate is positioned in a magnetic field generated by the electromagnets, and the reciprocating motion of the conductor plate can cut magnetic lines of force; the linear bearing is arranged on the upper side of the damper frame;
the mass flywheel comprises a hub, spokes and a balancing weight; the spokes are distributed on the wheel drum at equal intervals; the balancing weights are detachably or/and adjustably arranged on the spokes in the axial position; the mass flywheel is sleeved outside the ball nut.
Further, the ball screw mechanism includes a screw, a ball nut, and a thrust bearing for axially positioning the ball nut.
Furthermore, the balancing weight can axially slide along the spoke, so that the rotational inertia of the mass flywheel is changed, and the purpose of adjusting the inertial mass is achieved; in the ball screw mechanism, only the screw rod generates axial linear motion along with the vibration of the model stay cable and drives the conductor plate to perform linear motion, and the ball nut and the mass flywheel both generate rotary motion.
Further, the upper end of the conductor plate is provided with a linear optical axis, and the lower end of the conductor plate is connected with the screw; the linear optical axis penetrates through the linear bearing; a supporting spring is sleeved outside the part of the linear optical axis passing through the linear bearing; the tail end of the linear optical axis is provided with a spring baffle; the supporting spring is limited on the linear optical axis through the spring baffle; the conductor plate only generates in-plane linear motion under the limitation of the screw and the linear bearing; the conductor plate does not have out-of-plane rotational movement under the restriction of the support spring and the spring retainer.
Further, a movable portion thereof includes the screw, the conductor plate, the optical axis and the spring stopper, and the weight of the movable portion is borne by the support spring; under the action of the supporting spring, the model stay cable cannot generate initial deformation due to the weight of the movable part of the damper, so that the test error of the model stay cable vibration test is reduced; under the action of the supporting spring, after each model stay cable vibration test, the model stay cable and the movable part can return to the initial balance position, and the self-resetting function is realized.
Furthermore, electromagnets are arranged on two opposite sides of the damper frame; the north and south poles of the electromagnets are oppositely arranged; the electromagnet generates an electromagnetic field through external power supply; the electromagnetic field intensity can be adjusted by adjusting the power supply current; the conductor moves in an electromagnetic field to generate equivalent viscous damping force, and the damping coefficient can be adjusted by changing the power supply current of the electromagnet.
The invention can continuously and highly precisely adjust the inertia mass and the damping coefficient, can be used for a multi-working-condition model inhaul cable vibration reduction test, solves the problem that the existing parameters can not be continuously adjusted at high precision, and provides an effective means for verifying the vibration reduction effect of the inertia mass damper.
Drawings
Fig. 1 is an overall schematic diagram of an embodiment of the present invention.
FIG. 2 is a schematic view of a damper frame according to an embodiment of the present invention.
Fig. 3 is a schematic view of a ball screw mechanism according to an embodiment of the present invention.
Fig. 4 is a schematic view of a mass flywheel according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a conductive plate according to an embodiment of the invention.
Fig. 6 is a schematic diagram of a model stay cable damping test.
Description of the main element reference numbers: 1: a damper frame body I; 2: a damper frame body II; 3: an electromagnet; 4: an electromagnet fixing bin; 5: a damper frame; 6: a linear bearing; 7: a support spring; 8: a spring retainer; 9: a ball screw; 10: a thrust bearing; 11: a ball nut; 12: a drum; 13: spokes; 14: a balancing weight; 15: a conductor plate; 16: a straight optical axis, a model stay cable 17 and a damper 18.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "inside", "outside", "upper side", "lower side", "both sides", "straight line", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
The invention provides a parameter continuously adjustable self-resetting eddy current inertial mass damper for a model stay cable vibration reduction test, which comprises an electromagnet 3, an electromagnet fixing bin 4, a damper frame 5, a linear bearing 6, a supporting spring 7, a spring baffle plate 8, a ball screw 9, a thrust bearing 10, a ball nut 11, a hub 12, spokes 13, a balancing weight 14, a conductor plate 15, a linear optical axis 16, a model stay cable 17 and a damper 18, as shown in figures 1 to 5.
The damper frame 5 is composed of a frame body two 2 and a frame body one 1 located at the lower end of the frame body two 2.
As shown in the figure, the lower end of the damper 18 provided by the invention is connected with a model stay cable 17 through a ball screw 9; a sensor can be added between the ball screw 9 and the model stay cable 17 to measure and record test data such as damping force and damper displacement; the upper end of the ball screw 9 is connected with a conductor plate 15; a wheel drum 12 of the mass flywheel is sleeved outside the ball nut 11; the spokes 13 of the mass flywheel are arranged outside the hub 12; the balancing weights 14 of the mass flywheel are arranged on the spokes 13; the ball nut 11 is arranged in the damper frame body I1; thrust bearings 10 are respectively arranged on the upper side and the lower side of the ball nut 11; the electromagnets 3 are fixed in electromagnet fixing bins 4 arranged on two sides of the damper frame body II 2 through bolts to generate electromagnetic fields; the conductor plate 15 is arranged inside the damper frame body two 2; the upper end and the lower end of the conductor plate 15 are respectively connected with the ball screw 9 and the linear optical axis 16; the upper end of the damper frame 5 is provided with a linear bearing 6; the linear optical axis 16 passes through the linear bearing 6; a support spring 7 is sleeved on the section of the linear optical axis 16, which exceeds the outer side of the linear bearing 6, a spring baffle plate 8 is arranged at the other end of the support spring 7, and the spring baffle plate 8 is connected with the linear optical axis 16 or limited on the linear optical axis 16; the support spring 7 is fixed between the linear bearing 6 and the spring retainer 8 to support the mass of the movable portion of the damper.
In the test, the vibration of the model stay cable 17 drives the ball screw 9 to axially and linearly move; due to the limitation of the thrust bearing 10, the movement of the ball screw 9 only causes the ball nut 11 to perform a rotational movement within the damper frame body-one 1. The ball nut 11 drives the mass flywheel to rotate, so that inertial mass is generated, and the damper has obvious negative rigidity.
Further, by changing the mass of the weight block 14 or the lead of the ball screw 9, the inertial mass provided by the mass flywheel can be adjusted in a larger range in the whole situation; and the position of the balancing weight 14 on the spoke 13 is changed, so that the aim of continuously adjusting the inertial mass in a local range with high precision can be fulfilled.
The movement of the ball screw 9 moves the conductor plate 15 within the electromagnetic field generated by the electromagnet 3. Due to the limitation of the linear bearing 6, the supporting spring 7 and the spring fastener 8, the conductor plate 15 only performs in-plane motion along the axial direction of the ball screw 9 in a magnetic field; the conductor plate 15 does not undergo a rotational movement along the conductor plate axis due to the limitation of the support spring 7 and the spring stop 8.
The movement of the conductive plate 15 within the magnetic field causes an electromagnetic induction phenomenon, causing eddy currents to be generated within the conductive plate 15. Because of the existence of the electric eddy current, the conductor plate 15 moving in the magnetic field is acted by an ampere force, and the ampere force is proportional to the moving speed of the conductor plate 15 according to the ampere theorem, so that the ampere force can be regarded as an equivalent viscous damping force, and the proportionality coefficient of the equivalent viscous damping force is the equivalent viscous damping coefficient.
Further, the equivalent viscous damping coefficient can be adjusted greatly from the whole situation by changing the size of the electromagnet 3, the winding density of the coil of the electromagnet 3 and the material or the size of the conductor plate 15; and the purpose of continuously adjusting the damping coefficient with high precision in a local range can be achieved by changing the power supply current of the electromagnet 3.
Preferably, the conductor plate 15 is suggested to use a copper plate.
The weights of the ball screw 9, the spring baffle 8, the conductor plate 15 and the linear optical axis 16 are all supported by the supporting spring 7, so that the influence of the weight of the movable part on the model stay cable can be reduced, the model stay cable is not initially deformed, the self-resetting function is realized, and the accuracy of a test result can be effectively improved.
Claims (6)
1. A parameter continuously adjustable self-resetting eddy current inertia mass damper for a model stay cable vibration attenuation test is characterized by comprising a damper frame, a ball screw mechanism, a mass flywheel, a conductor plate, an electromagnet and a linear bearing;
one end of a screw rod in the ball screw mechanism is connected with the model stay cable, and the other end of the screw rod is connected with the conductor plate; a ball nut and the conductor plate in the ball screw mechanism are arranged in a damper frame, and the ball nut is axially positioned;
the electromagnets are fixed on two sides of the damper frame, the conductor plate is positioned in a magnetic field generated by the electromagnets, and the reciprocating motion of the conductor plate can cut magnetic lines of force; the linear bearing is arranged on the upper side of the damper frame;
the mass flywheel comprises a hub, spokes and a balancing weight; the spokes are distributed on the wheel drum at equal intervals; the balancing weights are detachably or/and axially arranged on the spokes in an adjustable manner; the mass flywheel is sleeved outside the ball nut.
2. The self-resetting eddy current inertia mass damper with continuously adjustable parameters for the model stay cable vibration damping test according to claim 1, wherein the ball screw mechanism comprises a screw rod, a ball nut and a thrust bearing for axially positioning the ball nut.
3. The self-resetting eddy current inertial mass damper with continuously adjustable parameters for the model stay cable vibration attenuation test as claimed in claim 1, wherein the balancing weight can slide axially along the spoke so as to change the rotational inertia of the mass flywheel and achieve the purpose of adjusting the inertial mass; in the ball screw mechanism, only the screw rod generates axial linear motion along with the vibration of the model stay cable and drives the conductor plate to perform linear motion, and the ball nut and the mass flywheel both generate rotary motion.
4. The parameter continuously adjustable self-resetting eddy current inertia mass damper for the model stay cable vibration attenuation test according to claim 1, characterized in that the upper end of the conductor plate is provided with a linear optical axis, and the lower end of the conductor plate is connected with the screw rod; the linear optical axis penetrates through the linear bearing; a supporting spring is sleeved outside the part of the linear optical axis penetrating through the linear bearing; the tail end of the linear optical axis is provided with a spring baffle; the supporting spring is limited on the linear optical axis through the spring baffle; the conductor plate only generates in-plane linear motion under the limitation of the screw and the linear bearing; the conductor plate does not have out-of-plane rotational movement under the restriction of the support spring and the spring retainer.
5. The parameter continuously adjustable self-resetting eddy current inertia mass damper for the model stay cable vibration attenuation test is characterized in that a movable part of the damper comprises the screw, the conductor plate, the optical axis and the spring baffle, and the weight of the movable part is borne by the supporting spring; under the action of the supporting spring, the model stay cable cannot generate initial deformation due to the weight of the movable part of the damper, so that the test error of the model stay cable vibration test is reduced; under the action of the supporting spring, after each model stay cable vibration test, the model stay cable and the movable part can return to the initial balance position, and the self-resetting function is realized.
6. The parameter continuously adjustable self-resetting eddy current inertial mass damper for the model stay cable vibration attenuation test according to claim 1, wherein electromagnets are arranged on two opposite sides of the damper frame; the north and south poles of the electromagnets are oppositely arranged; the electromagnet generates an electromagnetic field through external power supply; the electromagnetic field intensity can be adjusted by adjusting the magnitude of the power supply current; the conductor moves in an electromagnetic field to generate equivalent viscous damping force, and the damping coefficient can be adjusted by changing the power supply current of the electromagnet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310056831.XA CN115978131A (en) | 2023-01-17 | 2023-01-17 | Parameter continuously adjustable self-resetting eddy current inertial mass damper for model stay cable vibration reduction test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310056831.XA CN115978131A (en) | 2023-01-17 | 2023-01-17 | Parameter continuously adjustable self-resetting eddy current inertial mass damper for model stay cable vibration reduction test |
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| CN115978131A true CN115978131A (en) | 2023-04-18 |
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| CN202310056831.XA Pending CN115978131A (en) | 2023-01-17 | 2023-01-17 | Parameter continuously adjustable self-resetting eddy current inertial mass damper for model stay cable vibration reduction test |
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- 2023-01-17 CN CN202310056831.XA patent/CN115978131A/en active Pending
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