JP5238324B2 - Soundproofing method for railcar panels and railcar soundproofing panel structure used therefor - Google Patents

Description

  The present invention specifically relates to a soundproofing method for various railcar panels such as floors, sides, ceilings, wives, and partition walls, and a railcar soundproof panel used therefor.

  Railcar panels generally employ a structure in which a face plate is applied to the front and back of a frame and bonded together, or a sandwich structure in which foamed resin is sandwiched between front and back face plates. In a floor panel structure or the like that is separate from the partition wall or the base frame that is the primary structure portion, the two face plates often use a metal face plate that is different from the primary structure portion. The space between these two face plates is often filled with a fiber insulating material that serves both as soundproofing and heat insulation. On the other hand, when the structure outer plate forms the primary structure portion of the vehicle, the face plate inside the vehicle is an interior decorative plate.

  By the way, as a method of improving soundproofing and sound insulation, it is already known to use a combination of a thin film and a fiber-based sound-absorbing heat insulating material (see, for example, Patent Documents 1 and 2), a lead plate, It is also known to use a combination of a sound insulating sheet composed of a lead foil, a lead foil laminate, a sheet layer containing lead powder, and the like, and a board-like synthetic resin foam layer (see, for example, Patent Document 3).

  The technique disclosed in Patent Document 1 is that the sound insulation sheet carried by adhering to the fiber heat insulating material causes resonance in the frequency band of the target sound for sound insulation, and the sound insulation effect is impaired. By applying an impact absorbing material on one side, a decrease in vibration energy absorption capability in the resonance region of the sound insulating sheet is prevented, and the applied impact absorbing material can also serve as the adhesive. Further, the fiber heat insulating material is such that the contact points between the fibers are bound by thermosetting resin, and the vibration of the sound insulation sheet is suppressed by restricting the freedom of the fibers.

  The technique disclosed in Patent Document 2 is that the reflected sound is considerably less than in the case of a non-porous metal foil by a large number of perforations provided in a metal foil sandwiched between felts or non-woven fabrics made of a plurality of inorganic fibers, and the transmitted sound is also low in the metal foil. By forming a multi-layer, a part of the reflection is transmitted between the metal foil of the next layer and a part of the sound is transmitted. The sound transmitted through the first metal foil is transmitted between the second metal foil and the second metal foil. The reflection and absorption are repeated and attenuated, and the attenuation rate increases as the number of layers increases. The first reflected sound is absorbed by the surface inorganic fiber layer, and the reflected sound from the other layers is the same as the transmitted sound. It is said that the reflection of sound will be very little. In addition, electromagnetic waves can be attenuated by the same mechanism, and since the entire structure is intertwined and integrated by needle punching, the boundary between the inorganic fiber layer and the metal foil is smaller than when an adhesive is used. It slides fairly freely, has a considerable flexibility as a whole, is familiar with curved surfaces and rounded portions, and does not cause problems of delamination or cracking due to bending.

The technology disclosed in Patent Document 3 is based on the fact that a rubber sheet similar to that described in Patent Document 1 is bonded to one side of a lead-based sound insulating sheet or foil carried on a synthetic resin foam layer, so that the target sound of the sound insulating sheet This prevents the sound insulation performance of the entire panel from being lowered due to the resonance of the sound insulation sheet. Therefore, each layer is laminated and integrated.
JP-A-10-196003 Japanese Utility Model Publication No. 63-121530 Japanese Utility Model Publication No. 1-162505

  However, since all of the ones described in Patent Documents 1 to 3 have a panel structure that is laminated and integrated, it causes an increase in cost by an amount that requires separate bonding work and needle punching work.

  In addition, the technique described in Patent Document 2 is based on the fact that the entire panel is integrated by needle punching and the sound absorption effect is reduced by the degree of freedom of inorganic fibers, and the sound insulating sheet is a lead-based foil or sheet. Damping and sound insulation can be improved, but in addition to weight, it is inferior to the environment, and increasing the number of layers of lead-based foils and sheets to enhance the sound insulation effect will further increase the complexity and cost of the structure. It is a cause and is unsuitable for railway vehicles in terms of weight and environment.

  Moreover, in the thing of patent documents 1, 3, after carrying the fiber heat insulating material bound with the thermosetting resin, or the synthetic resin foaming material, the vibration point of the sound insulation sheet is limited. Since a shock absorber or rubber is attached to prevent resonance with the target sound, the structure is further complicated and the cost is increased.

An object of the present invention is to provide a soundproofing method for a railcar panel that exhibits a higher soundproofing and soundproofing effect than before without increasing the complexity, cost and weight of the structure, and the soundproofing for a railcar used in the method. To provide a panel structure.

  In order to achieve the above-described object, the soundproofing method for a railcar panel according to the present invention is a panel used in a railcar, in which the front and back faceplates are placed in a grid between the faceplates applied to the front and back of the framework. Resonance with the target sound wave with a new technology that applies tension to the thin film stretched in parallel, and cushioning by this filled fiber group filled with free fiber sound insulation material between the front and back face plates By supporting innumerable, irregular, and varying contact structures with all the fibers, the vibration region of the thin film, the amplitude is miniaturized, randomized, and moved, the side of the thin film of the air vibration energy of the target sound wave One feature is to increase the efficiency of conversion into vibration energy and to convert the lateral vibration energy of the thin film into heat in the support structure by the filled fiber group between the front and back plates, and to provide consumption for sound insulation.

  In such a configuration, by applying tension to the thin film extending parallel to the front and back face plates in the mesh between the face plates applied to the front and back of the frame in the panel used in the railway vehicle, Resonance is achieved by supporting the thin film with a myriad of irregular and fluctuating contact structures with free fibers with cushioning from both sides by the filled fiber groups backed up by the front and back plates. The vibration region, amplitude, randomization, and movement of the thin film to be excited are excited by a wide range of frequencies and absorbed by the free and vigorous vibration of each fiber in the packed fiber group, and the vibration energy is efficiently converted into thermal energy. It can be converted, consumed and soundproofed and soundproofed.

  Such a soundproofing method is applied to a panel used in a railway vehicle, in order to resonate with the target sound wave in a grid between face plates applied to the front and back of the frame, and stretched parallel to the front and back face plates. The thin film and the thin film are supported by a myriad of irregular, fluctuating contact structures filled with free fiber sound insulation material between the front and back face plates, and with cushioning properties. The present invention is realized by a soundproof panel structure for a railway vehicle characterized in that it includes a group of filled fibers for miniaturizing, randomizing, and moving the amplitude.

  The soundproofing method for a railcar panel according to the present invention is also a panel used in a railcar, in which a face plate applied to the front and back of the framework is restrained by sandwiching a restraining type damping plate, for example, a resin film between metal plates. As a vibration plate, in addition to suppressing the vibration of the front and back face plates themselves by receiving the vibration propagated through the structure and the air propagation, the thin film that stretches in parallel with the front and back face plates in the mesh Applying tension to resonate with the target sound wave, and the thin film between the front and back face plates and countless and irregular with the fibers with cushioning properties by the filled fiber group filled with free fiber sound insulation , By supporting with a changing contact structure, and increasing the vibration range of the thin film, miniaturizing, randomizing, and moving the target sound wave, increase the conversion efficiency of the air vibration energy of the target sound wave into the lateral vibration energy of the thin film, The transverse vibration energy of this thin film Conversion to heat in the support structure by filling fiber group of the back plates, and another, characterized in that soundproof subjected to consumption.

  In such a configuration, in addition to the case of one feature, the face plate applied to the front and back of the frame is a vibration control plate in which the resin film is sandwiched between the metal plates, so that the vibration propagated individually through the structure In addition, it is possible to suppress the vibration of the front and back face plates themselves due to vibrations propagated in the air and to generate sound, thereby enhancing the soundproofing function.

  In such a soundproofing method, in a panel used for a railway vehicle, a face plate applied to the front and back of the frame is a resin type with a restrained vibration control plate, for example, a vibration control plate sandwiched between metal plates. A thin film stretched in parallel with the front and back face plates by applying tension to resonate with the target sound wave in the mesh between the applied face plates, and a free fiber sound insulation material between the front and back face plates. With an infinite number of irregular and irregular contact structures with fibers filled with cushioning properties, and a filled fiber group for thin film vibration range, amplitude miniaturization, randomization, and movement This can be realized by a soundproof panel structure for a railway vehicle having another feature.

  In the above, the thin film may be a metal foil such as aluminum or a synthetic film of a metal foil and a resin, and the film thickness in the case of aluminum may be about 45 to 55 μm.

  In such a configuration, in addition to the above, the thin film can improve the soundproofing effect as the film thickness is thin. However, in the case of aluminum foil, it is possible to achieve soundproofing in a range that can be perceived by humans as 55 μm or less, and 45 μm or more. Durability to withstand practical use can be ensured, and 50 μm is the optimum value.

  In the above, the tension applied to the thin film may be about 1 to 10 MPa.

  In such a configuration, in addition to the above, the resonance action is further increased at 1 MPa or more, and by setting the pressure to 10 MPa or less, the thin film is prevented from being torn or torn by tension, and a wide range of 500 Hz to 5000 Hz is obtained. Therefore, a sound insulation effect of 5 dB at the maximum can be obtained as compared with the conventional structure by efficiently converting and consuming the heat energy by resonance with the transmitted sound frequency band.

In the above, the filled fiber group may be filled and used so as to have a weight density of about 10 to ³⁰ kg / m ³ .

In such a configuration, in addition to the above, the weight density of the filled fiber group is set to 10 g / m ³ or more, and the vibration range of the resonating thin film, the amplitude is miniaturized, randomized, and the frequency of a wide range is achieved. The effect of efficiently converting and consuming vibration energy into heat energy while absorbing with excitation and free and vigorous micro vibrations of each fiber of the filled fiber group is obtained, and the weight is practically used for railway vehicles as 30 kg / m ³ or less. The soundproofing and sound insulation effects can be further enhanced within the range that can be achieved.

  Further objects and features of the present invention will become apparent from the following detailed description and drawings. Each feature of the present invention can be employed alone or in combination as much as possible.

According to the soundproofing method and soundproofing structure for a railcar panel of the present invention, tension is applied to the thin film extending in parallel with the front and back face plates in the mesh between the face plates applied to the front and back of the frame, and this is applied to the front and back plates. A panel suitable for a railway vehicle with a simple, low-cost and lightweight structure that is supported from both sides by a group of filled fibers composed of free fibers backed up at A wide range of frequencies are excited by support from both sides by free fibers of a packed fiber group backed up on the front and back plates of a resonating thin film, and the vibration energy is converted into thermal energy by absorbing free and vigorous vibrations of each fiber. efficiently converted consumption to high soundproof effect compared to the conventional, it is possible to exhibit the sound effect shielding, the vehicle floor, side, ceiling, in such wife, rolling sound emanating from between the wheels and the rail And tunnel reflection sound inside the car Soundproofed to, which is suitable to improve the sound insulation.

  In addition, the face plate applied to the front and back of the skeleton is only a resin-type restraint type damping plate, and it receives vibrations propagated individually through the structure and vibrations propagated through the air without making the structure particularly complicated. The front and back face plates themselves can be prevented from vibrating and sounding, and the soundproofing and soundproofing functions can be further enhanced, which is suitable for floor panels that have a large problem of transmission and transmission of rolling noise of vehicles.

  Hereinafter, a soundproofing method for a railcar panel according to an embodiment of the present invention and a railcar panel structure used therefor will be described with reference to the drawings for understanding of the present invention. The following description and illustration are specific examples of the present invention, and do not limit the description of the scope of the claims.

  In a railway vehicle, the frequency band of noise transmitted from the outside of the vehicle to the inside of the vehicle is generally about 500 Hz to 5000 Hz. Further, experience has shown that solid vibration transmission sound is often about 50 Hz to 500 Hz. By properly insulating and suppressing the frequency band of transmission noise and solid vibration transmission, it is possible to maintain a quiet interior environment and provide a comfortable passenger service.

The soundproofing method for a railcar panel according to the present invention is applied to a panel 1 and the like schematically illustrated in FIG. 1 used for a railcar mainly for the purpose of mainly improving sound insulation against transmitted sound. The panel 1 is formed by applying face plates 4 and 5 to the front and back of a frame 3 having a quadrilateral frame made of a brazing material and a grid 2 made of a brazing material etc. that is fixed in the four-circumferential frame vertically and horizontally by welding or the like. It is integrated by welding. The illustrated panel 1 is an example in the case of a floor panel of a railway vehicle, and the front and back face plates 4 and 5 have the same thickness and the same structure in terms of strength, soundproofing and vibration control. However, in the panels such as the side, the ceiling, and the wife, the face plate 4 on the front side is a vehicle outer plate, whereas the face plate 5 on the back side is a decorative plate, and the connection to the frame 3 is a screwed structure that can be removed. In the partition wall panel, both the front and back face plates 4 and 5 are decorative plates. The framework 3 and the face plates 4 and 5 are made of a metal material such as aluminum, iron or stainless steel, but the decorative plate is made of a reinforced resin material such as FRP. Aluminum-based and iron- based aggregates may be cut into extruded shapes.

In any case, in the soundproofing and sound insulation for the transmitted sound through the panel 1 as shown in FIG. 1, in this embodiment, a tension is applied to the thin film 6 extending parallel to the front and back face plates 4 and 5 in the mesh 2. Resonance with the target sound wave, and the thin film 6 between the front and back face plates 4 and 5 and the myriad of fibers with cushioning properties by the filled fiber group 7 filled with the free fiber sound insulating material 7a. In addition, the vibration region of the thin film 6 is supported by an irregular and fluctuating contact structure, the amplitude is reduced, randomized, and moved to convert the air vibration energy of the target sound wave into the transverse vibration energy of the thin film. The efficiency is increased, and the lateral vibration energy of the thin film 6 is converted into heat and consumed in the support structure by the filled fiber group 7 between the front and back plates 4 and 5 to be soundproofed. In this way, by applying tension to the thin film 6 extending parallel to the front and back face plates 4 and 5 in the grid 2 between the face plates 4 and 5 applied to the front and back of the frame 3 in the panel 1, sound insulation and soundproofing are achieved. Infinite, irregular, and fluctuating contact structure with the free fiber 7a with cushioning from both sides by the filled fiber group 7 backed up by the front and back plates 4, 5 In order to excite a wide range of frequencies by resonating the thin film 6 by supporting the thin film 6 in order to reduce the vibration range, amplitude, randomization, and movement of the thin film 6, each of the fibers 7 a of the packed fiber group 7 is free and vigorous. Absorbing by vibration, vibration energy can be efficiently converted to heat energy, consumed, soundproofed, and insulated.

A tension is applied to the thin film 6 extending parallel to the front and back face plates 4 and 5 in the grid 2 between the face plates 4 and 5 applied to the front and back of the frame 3, and this is applied to the front and back plates 4 and 5. The panel 1 suitable for a railway vehicle having a simple, low-cost and lightweight structure that is supported from both sides by the back-up filled fiber group 7 composed of the free fibers 7a and the target sound wave of the thin film 6 to which tension is applied. A wide range of frequencies are excited by resonance and support from both sides by the free fibers 7a forming the filled fiber group 7 backed up by the front and back plates 4 and 5 of the resonating thin film 6, thereby free and vigorous micro vibration of each fiber. absorb vibration energy efficiently converted into thermal energy, consumed by a high soundproof effect compared with the conventional Te, it can exhibit sound effect shielding, the vehicle floor, side, ceiling, in such wives, and the wheels Rolling sound and tunnel anti-noise emitted from between the rails Soundproof to the interior side of the sound, which is suitable to improve the sound insulation.

  This soundproofing method is for the purpose of resonance with the target sound wave in the mesh 2 between the face plates 4 and 5 applied to the front and back of the frame 3 in the panel 1 used in the railway vehicle. A thin film 6 stretched parallel to the front and back face plates 4 and 5 by applying tension, and a free fiber sound insulating material 7a is filled between the thin film 6 and the front and back face plates, and fibers 7a with cushioning properties. Realized by the structure of the soundproof panel 1 for railway vehicles, which is supported by an innumerable, irregular, and changing contact structure, and the vibration region of the thin film 6 and the filling fiber group 7 for minimizing, randomizing and moving the amplitude. To do.

The above soundproofing and soundproofing technologies are completely opposite to the technology for preventing resonance with the target sound of the thin film. However, when the transmitted sound enters from the outside of the panel, sound is transmitted through the thin film 6 stretched on the mesh 2. Is excited to induce micro-vibration of the thin film 6, and the micro-vibration of the thin film 6 is transmitted to the packed fiber group 7 that supports the thin film 6 from both sides of the back-up bases of the front and back face plates 4 and 5. Energy becomes the kinetic energy of the thin film 6, which is transmitted to the filled fiber group 7 and converted into heat energy for consumption, which promotes attenuation of the sound pressure level, increases the sound insulation effect of the panel 1, and increases the transmitted sound pressure level. It can be reduced, and it is considered that the conversion efficiency of vibration energy to thermal energy exceeds the reduction amount of transmission loss due to the coincidence effect, and a sound insulation effect much higher than that of the conventional one can be obtained. Is a book Which can be verified by experiments of the inventor.

Specifically, the present inventors initially produced a panel without a fiber sound insulating material by squeezing only a thin film in the space between the two face plates of the front and back in the panel, and obtained the sound insulation characteristics by experiments. Next, a panel in which the thin film was pressed by stuffing the panel with fiber sound insulation material from both sides of the thin film was prototyped, and the sound insulation characteristics were obtained by experiments. As a result of carrying out the test while comparing the density of the fiber sound insulating material for pressing the thin film, the optimum sound insulating effect was obtained when the fiber sound insulating material having a weight density of 10 to 30 kg / m ³ was used. As a result, as shown in FIG. 5, the effect of the fiber sound insulating material pressing the thin film from both sides on the sound insulating performance could be verified.

If it is less than 10 kg / m ^3, it is lightweight, but its soundproofing and sound insulation properties are low. If it has a density of 30 kg / m ³ or more, a further increase in sound insulation effect is expected, but there is a problem of an increase in panel weight per unit area. In addition, there is a possibility that the increase in the force for pressing the thin film may hinder the fine vibration of the thin film. Therefore, in this embodiment, one example of the sound insulation performance is shown. ˜30 kg / m ³ is considered to have the optimum value of the fiber sound insulation density.

Furthermore, the inventors of the present invention have two types of panels, a panel that is tensioned without intentional pretension (film stress) and a panel that is tensioned with pretension (film stress) when the thin film is tensioned. Was produced on both sides under the same conditions, and a prototype was inserted and the sound insulation characteristics were obtained by experiments. As the results are shown in Figure 6, panel imparted with pretension about 1~10MPa the thin film, as compared to a panel without pretension, was found to have a sound insulation effect of up to about 8dB . As described above, when the tension applied to the thin film is about 1 to 10 MPa, the resonance action is increased at 1 MPa or more, thereby preventing the thin film from being torn or torn by the tension. By resonating with a wide transmitted sound frequency band of 500 Hz to 5000 Hz and efficiently converting and consuming the heat energy, a sound insulation effect of 5 dB at the maximum can be obtained as compared with the conventional structure.

The pretension may be applied in any way, but is applied between at least two surfaces facing each other in the grid 2 of the frame 3. In the example shown in FIG. 1 and FIG. 2, the pulling bars 11 and 12 having the retaining portions 11a and 12a made of extruded shapes or the like are fixed to the opposing two sides of the thin film 6 by ultrasonic welding or bonding. Then, in a state where the thin film 6 is pulled between the pulling bars 11 and 12 to give a predetermined pretension, the bifurcated concave portion 3a1 integrally formed by extrusion molding on the two opposing surfaces 3a and 3b of the mesh 2; The pulling bars 11 and 12 are fitted into 3b1, and the retaining portions 11a and 12a are engaged with the locking portions 3a2 and 3b2 provided in the bifurcated concave portions 3a1 and 3b1 to prevent the retaining bars 11a and 12a from coming off. . When the fitting with the above-described retaining is the fitting in the direction of the arrow shown in FIG. 2 using the elasticity of the bifurcated recesses 3a1, 3b1, there is a convenience that can be retrofitted to the assembled frame 3. However, a pretension can be applied when the aggregate 3 is assembled by sliding the frame 3 in the direction perpendicular to the arrow and fitting it inelastically. Note that the pulling bars 11 and 12 can be made of resin, and their elasticity can be used.

However, the specific method is not particularly limited. In the example shown in FIGS. 3 and 4, the end portion of the thin film 6 is sandwiched and fixed as shown in FIG. 3 by a metal fixing plate 22 that is fixed between the opposing surfaces 3 a and 3 b of the frame 3 with screws 21 or the like. Then, the thin film 6 is pushed by the pressing plate 23 as shown in FIG. 4 on the film receiving piece 22a projecting to the opposite side of the fixing plate 22 at a lower position than the height position of the thin film 6 in the fixed state. Thus, a predetermined pre-tension is applied, and the screw 24 is screwed and stabilized.

  Moreover, the panel which changed the film thickness of the thin film into 40 micrometers, 100 micrometers, and 150 micrometers was made as an experiment, and each sound insulation property was measured by experiment. FIG. 7 shows a comparison result of the sound insulation characteristics due to the difference in film thickness. From these results, it is understood that the sound insulation effect is improved when the film thickness is smaller among these three kinds of film thicknesses. However, thinning thinly may impair the strength of the thin film and reduce durability.

で与えられる数値Ｄが概ねＤ＝１Ｎｍｍ²/ｍｍとなるように、材料パラメータを式１に代入して膜厚ｔを決定することが適切であること、および膜厚ｔの依存度が高いことを知見している。 Therefore, considering the lateral bending rigidity of the thin film,
[Formula 1]

It is appropriate to determine the film thickness t by substituting the material parameters into Equation 1 so that the numerical value D given by D is approximately D = 1 Nmm ² / mm, and the dependency on the film thickness t is high. I know.

となる。 However, D: Lateral bending rigidity of thin film E: Young's modulus t: Film thickness v: Poisson's ratio thin film uses a metal foil such as aluminum or copper or a synthetic film of a metal foil and a resin, but uses a single sheet of aluminum foil. In this case, the aluminum material parameter E = 68699. Substituting N / mm 2 and v = 0.33 to obtain the film thickness t with which the lateral bending composition D = 1,
[Formula 2]

It becomes.

  The film thickness is about 0.05 mm = 50 μm.

  In the experiments by the present inventors, it can be said that the film thickness in the case of aluminum is preferably about 45 to 55 μm. The thinner the thin film, the higher the soundproofing effect. In the case of aluminum foil, it is possible to achieve soundproofing in a range that can be perceived by humans as 55 μm or less, and durability that can be practically used as 45 μm or more, 50 μm is the optimum value, which is consistent with the solution of Equation 2 using Equation 1 above.

  In the example shown in FIG. 1, the frame 3 is mainly used for the purpose of suppressing the vibration of the individual body via the structure and the vibration of the air propagation due to vibration transmitted by the individual body and suppressing the surface plate itself from vibrating and sounding. The face plates 4 and 5 applied to the front and back are individually propagated through the structure as restraint type damping plates, for example, damping plates sandwiching the resin films 4a and 5a between the metal plates 4b and 4c, 5b and 5c. The front and back face plates 4 and 5 themselves are prevented from vibrating and receiving sound due to vibration and air-propagated vibration, and the face plates 4 and 5 applied to the front and back of the framework 3 are made of resin films 4a and 5a. By using a constrained damping plate sandwiched between the metal plates 4b, 4c, 5b, 5c, etc., the front and back face plates themselves vibrate in response to vibrations propagated individually through the structure and air. To further improve the soundproofing function. That. Therefore, the structure is made particularly complicated simply by using the face plates 4 and 5 applied to the front and back of the frame 3 as vibration damping plates in which the resin films 4a and 5a are sandwiched between the metal plates 4b and 4c and 5b and 5c. Sound and sound insulation function without suppressing the sound of the front and back face plates vibrating due to vibrations propagated through the structure and air propagated through the structure without any particular increase in costs. It is suitable for a floor panel that has a large problem of transmission and transmission of rolling noise of a vehicle.

  INDUSTRIAL APPLICABILITY The present invention is practically used for a panel for enclosing or partitioning a passenger room of a railway vehicle, and exhibits higher soundproofing and sound insulation performance than before without making the structure complicated and heavy.

1 is a schematic cross-sectional view showing a railcar panel structure according to an embodiment of the present invention. It is a partially exploded perspective view in the panel structure of FIG. It is principal part sectional drawing which shows the modification of the pre-tension provision structure of a thin film with respect to the panel structure of FIG. 1, FIG. 2 in a preliminary | backup stage. It is principal part sectional drawing which shows the modification of the thin film pre-tension provision structure with respect to the panel structure of FIG. 1, FIG. It is a comparison graph of the frequency and the sound insulation effect by the experiment in three examples of panel only, panel + aluminum foil, panel + aluminum foil + fiber sound insulation material. It is a comparison graph of the frequency and the sound-insulation effect by experiment in two examples of a panel without tension of a thin film and a panel with tension. It is a comparative graph of the frequency and the sound-insulation effect by experiment in three examples whose thickness of a thin film is 150 micrometers, 100 micrometers, and 40 micrometers.

Explanation of symbols

1 panel 2 square 3 framework 3a, 3b facing surface 3a1,3b1 forked recess 3a2,3b2 engaging portion 4,5 faceplate 4 b, 4 c, 5 b , 5 c metal plate 4 a, 5 a resin 6 thin film 7 filled Fiber group 7a Free fibers 11, 12 Pull bars 11a, 12a Retaining parts 21, 24 Screws 22 Fixing plate 22a Membrane receiving piece 23 Holding plate

Claims (5)

  In panels used in railway vehicles, the faceplates that face the front and back of the frame are used as restraint type damping plates, and the faceplates on the front and back surfaces are vibrated and pronounced in response to vibrations propagated individually through the structure and air. In addition, the thin film that extends in parallel to the front and back face plates in the mesh is tensioned to resonate with the target sound wave, and this thin film is placed between the front and back face plates and free fiber sound insulating material there. By supporting innumerable, irregular, and varying contact structures with fibers with cushioning properties by the filled fiber group filled with a thin film, the vibration range of the thin film, amplitude miniaturization, randomization, and movement Enhances the efficiency of converting the air vibration energy of the target sound wave into the lateral vibration energy of the thin film, and converts the lateral vibration energy of the thin film into heat in the support structure by the filled fiber group between the front and back plates for sound consumption and consumption. Iron characterized by Soundproof method in the vehicle panel. 2. The soundproofing method for a railcar panel according to claim 1, wherein the thin film uses a metal foil such as aluminum or copper or a synthetic film of a metal foil and a resin, and the film thickness in the case of the aluminum foil is about 45 to 55 μm. . The soundproofing method for a railcar panel according to claim 2 , wherein the tension applied to the thin film is about 1 to 10 MPa. The soundproofing method for a railcar panel according to any one of claims 1 to 3 , wherein the filled fiber group is filled and used so as to have a weight density of about 10 to ³⁰ kg / m ³ .   In panels used in railway vehicles, the face plates that are applied to the front and back of the frame are restrained damping plates, and tension is applied to resonate with the target sound waves within the mesh between the face plates applied to the front and back of the frame. A thin film stretched parallel to the front and back face plates, and a contact structure that is infinite, irregular, and fluctuates between this thin film and the front and back face plates filled with free fiber sound insulation material and fibers with cushioning properties. A soundproof panel structure for a railway vehicle, comprising: a vibration region of a thin film; and a filling fiber group for miniaturizing, randomizing, and moving the amplitude of the thin film.

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