Vibration reduction equipment suitable for vibration analysis through modal superposition method

Abstract

The utility model provides vibration reduction equipment suitable for vibration analysis through a modal superposition method, relates to the technical field of vibration analysis, and aims to solve the technical problem that existing vibration reduction equipment for vibration analysis cannot be suitable for analysis through the modal superposition method. The vibration reduction equipment comprises a support and a lining, the support comprises a first barrel and two first end plates, and the two first end plates are arranged at the two ends of the first barrel correspondingly; the lining is made of rubber; the lining is arranged outside the first cylinder in a sleeving mode and located between the two first end plates. The lining comprises a second barrel and two second end plates, the two second end plates are arranged at the two ends of the second barrel respectively, and each second end plate is attached to the surface, facing the other first end plate, of the corresponding first end plate; the orthographic projection of the second cylinder on the surface of the second end plate is located in the surface of the second end plate; the orthographic projection of the first end plate on the surface of the second end plate coincides with the surface of the second end plate. The vibration reduction equipment is suitable for vibration analysis through a modal superposition method.

Description

TECHNICAL FIELD

[0001] The utility model relates to vibration analysis technical field especially relates to a kind of damping equipment suitable for modal superposition method to carry out vibration analysis. BACKGROUND

[0002] In vibration research analysis, modal superposition method can be used to quickly and efficiently calculate the modal response of linear structure, and the acceleration response of damping equipment in the damped equipment can be obtained after superimposing multi-order modal. However, the damped equipment containing nonlinear damping equipment cannot use modal superposition method due to its nonlinear characteristics, and current solution can only be obtained by using extremely large amount of transient method. Therefore, a damping equipment suitable for modal superposition method for vibration analysis is needed, which can greatly improve the efficiency of design and research work. SUMMARY

[0003] The utility model discloses a kind of damping equipment suitable for modal superposition method to carry out vibration analysis, to solve the technical problem that the damping equipment for vibration analysis cannot be suitable for modal superposition method analysis.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] The utility model provides a kind of damping equipment suitable for modal superposition method to carry out vibration analysis, including support and bushing, the support includes first cylinder and two first end plates, two first end plates are respectively arranged at the both ends of the first cylinder;The material of the bushing is rubber;

[0006] The bushing is set on the outside of the first cylinder and between two first end plates;

[0007] The bushing includes second cylinder and two second end plates, two second end plates are respectively arranged at the both ends of the second cylinder, and each second end plate is attached to the surface of corresponding first end plate facing another first end plate;

[0008] The orthographic projection of the second cylinder on the surface of the second end plate is located in the surface of the second end plate;

[0009] The orthographic projection of the first end plate on the surface of the second end plate coincides with the surface of the second end plate.

[0010] According to at least one embodiment of the utility model, the shape of the cross section of the first cylinder and two first end plates is circular.

[0011] According to at least one embodiment of the utility model, the shape of the cross section of the second cylinder and two second end plates is circular.

[0012] According to at least one embodiment of the present application, the ratio of the cross-sectional area of the second cylinder to the cross-sectional area of the second end plate is 1:2.

[0013] According to at least one embodiment of the present application, the damping device further comprises a base and a support leg supported on the bottom of the base.

[0014] The support leg comprises a stepped hole, and one of the first end plates of the support leg, the corresponding second end plate of the bushing and part of the second cylinder are embedded in the stepped hole.

[0015] According to at least one embodiment of the present application, the damping device further comprises a connecting column and a damped device located inside the support leg, one end of the connecting column is connected to the damped device, and the other end enters the cavity of the first end plate of the first cylinder close to the damped device and extends to the other first end plate.

[0016] According to at least one embodiment of the present application, the number of support legs is multiple, and the multiple support legs are distributed along the circumference of the base.

[0017] The damping device further comprises an undamped device, and the damped device and the undamped device are arranged in the space formed by the multiple support legs.

[0018] According to at least one embodiment of the present application, the damped device is located above the undamped device.

[0019] According to at least one embodiment of the present application, the undamped device is rigidly connected to the support leg.

[0020] According to at least one embodiment of the present application, the damping device further comprises a control device for obtaining the compression amount of the support and the bushing in the axial direction.

[0021] In one or more technical solutions provided in the exemplary embodiments of the present application, at least one of the following beneficial effects can be achieved.

[0022] The damping device suitable for modal superposition method vibration analysis of the utility model exemplary embodiment includes support and bushing, support includes first cylinder and two first end plates, two first end plates are respectively arranged at both ends of first cylinder;The material of bushing is rubber;Bushing is sleeved on the outside of first cylinder and is located between two first end plates;Bushing includes second cylinder and two second end plates, two second end plates are respectively arranged at both ends of second cylinder, and each second end plate is attached to the surface of corresponding first end plate towards another first end plate;The orthographic projection of second cylinder on the surface of second end plate is located in the surface of second end plate;The orthographic projection of first end plate on the surface of second end plate coincides with the surface of second end plate.Based on this, the bushing of rubber material is composed of three parts, which are the relatively thin second cylinder in the middle, the two relatively thick second end plates at both ends, the bushing can be supported by the support and fixed on the damped device and the corresponding foot, so that the combination of the bushing and the support as a whole can be regarded as a variable stiffness three-phase spring bushing, which is used to simplify the nonlinear rubber damper, so that it can be used for analyzing vibration by modal superposition method, avoiding the problem that only the extremely large amount of transient method can be solved, and the efficiency of research work can be greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings illustrate exemplary embodiments of the present application and, together with the general description of the application given above, and the detailed description of the embodiments given below, serve to explain the principles of the present application. These drawings are included herewith and constitute a part of this specification.

[0024] Figure 1 It is a structural schematic diagram of the damper according to the utility model embodiment;

[0025] Figure 2 It is a structural schematic diagram of the damping device according to the utility model embodiment;

[0026] Figure 3 It is a single-axis stress curve diagram of the damper according to the utility model embodiment;

[0027] Figure 4 It is a radial acceleration response diagram of the damping device according to the utility model embodiment obtained through test;

[0028] Figure 5 It is a radial acceleration response diagram of the damping device according to the utility model embodiment obtained through finite element simulation.

[0029] Fig. 1 is a foot;2, damper;3, support structure;4, damped device;5, undamped device;6, base;7, second cylinder;8, mounting surface;9, first end plate;10, second end plate. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.

[0031] Figure 1 is a structural schematic view of a damper according to the utility model embodiment. As shown in the figure, Figure 1 The damping device suitable for modal superposition method for vibration analysis provided by the exemplary embodiment of the utility model comprises a support and a bushing. The support comprises a first cylinder and two first end plates 9, and the two first end plates 9 are respectively arranged at the two ends of the first cylinder. The material of the bushing is rubber. The bushing is sleeved on the outside of the first cylinder and located between the two first end plates 9. The bushing comprises a second cylinder 7 and two second end plates 10, and the two second end plates 10 are respectively arranged at the two ends of the second cylinder 7. Each second end plate 10 is attached to the surface of the corresponding first end plate 9 facing the other first end plate 9. The orthographic projection of the second cylinder 7 on the surface of the second end plate 10 is located within the surface of the second end plate 10. The orthographic projection of the first end plate 9 on the surface of the second end plate 10 coincides with the surface of the second end plate 10.

[0032] In actual application, the bushing is made of rubber material, and the support can be made of rubber material or aluminum alloy material with higher hardness than the bushing as a component for supporting and protecting the bushing, so that the bushing can be connected to the damping device 4 and the corresponding foot 1. The bushing is sleeved on the support and located between the two first end plates 9, and the middle part (second cylinder 7) of the bushing is relatively thin, and the two second end plates 10 are relatively thick.

[0033] For example, the cross section of the first cylinder and the two first end plates 9 is circular. The cross section of the second cylinder 7 and the two second end plates 10 is circular.

[0034] The ratio of the cross-sectional area of the second cylinder 7 to the cross-sectional area of the second end plate 10 is 1:2.

[0035] As can be seen from the above, the second cylinder 7 is a cylindrical cylinder, and the combination of the support and the bushing forms a damper 2 which is generally thin in the middle and thick at both ends. This shape can form variable stiffness on the one hand and can be fixedly connected to the foot 1 on the other hand.

[0036] Figure 2 is a structural schematic view of a damping device according to the utility model embodiment. As shown in the figure, Figure 2 The damping device provided by the exemplary embodiment of the utility model comprises a base 6 and a plurality of feet 1 arranged on the base 6.

[0037] Specifically, the damping device further comprises a base 6 and a support leg 1 supported at the bottom of the base 6; the support leg 1 comprises a stepped hole in which a first end plate 9 of a bracket, a corresponding second end plate 10 of a bushing and part of a second cylinder 7 are embedded. The damping device further comprises a connecting column and a damped device 4 located inside the support leg 1, one end of the connecting column is connected to the damped device 4, and the other end enters from the cavity of the first end plate 9 of the first cylinder close to the damped device 4 and extends to the other first end plate 9.

[0038] In practical application, the stepped hole has a large hole matched with the peripheral surface of the second end plate 10 and a small hole matched with the peripheral surface of the second cylinder 7 from the outside to the inside of the support leg 1. When the mounting surface 8 of the first end plate 9 is attached and fixed to the damped device, the connecting column, the bracket and the bushing can be flexibly connected to the support leg 1.

[0039] In practical application, the number of the support legs 1 is multiple, and the number of the dampers 2 is multiple, and the dampers 2 correspond to the support legs 1 one by one. The support structure 3 comprises four support legs 1, and the number of the dampers 2 is also four, that is, the damped device 4 is connected to the four support legs 1 of the support structure 3 through the four dampers 2 respectively, and the damped device 4 is not in contact with the support legs 1 of the support structure 3 but is spaced apart to avoid affecting the experimental results of the dampers 2. Further, the undamped device 5 is rigidly connected to the four support legs 1 through a second support structure, which can serve as a reference for the damped device 4 flexibly connected to the support structure 3 to obtain accurate acceleration response results generated by the dampers 2 only to evaluate the damping effect of the dampers 2.

[0040] It should be noted that in order to obtain the required vibration acceleration response effect of the damped device 2, the damping device provided by the exemplary embodiments of the present application further comprises an excitation device for generating vibration on the damped device 4 and the undamped device 5. The excitation source of the excitation device can be provided on the base 6 or on the support structure 3, which can be selected according to actual needs. The excitation frequency of the excitation source can be 10Hz-500Hz, and can be 150Hz, 200Hz, 300Hz, 400Hz, etc.

[0041] When the damping device provided by the exemplary embodiments of the present application is tested, the damped device 4 is flexibly connected to the support structure 3 through the four dampers 2, which can protect the damped device 4 from damage caused by acceleration response. The undamped device 5 can be at a certain distance below the damped device 4, and the distance makes the undamped device 5 stop at the lower surface of the damped device 4 when the damped device 4 vibrates excessively, so that the damped device 4 does not vibrate excessively to cause damage to the internal components.

[0042] The four dampers 2 are detachable from the device 4 to be damped and the feet 1, and after the shaking table test of the four dampers 2 is completed, the four dampers 2 can be further replaced by other flexible dampers 2 to perform another shaking table test, so that the shaking table test device can be fully utilized and the versatility is higher.

[0043] In some embodiments, the undamped device 5 is a cuboid, and the positions close to the four corners of the undamped device 5 are rigidly connected to the four feet 1, respectively.

[0044] The shape of the undamped device 5 is substantially consistent with the shape of the damped device 4, and both are cuboid structures. In this embodiment, the shape of the four corner positions of the cuboid structure of the undamped device 5 can be matched with the shape of the feet 1 and attached to the feet 1, and the undamped device 5 is rigidly connected to the feet 1 by the second supporting structure on the feet 1, such as bolts or welding.

[0045] In some embodiments, the damping device provided by the exemplary embodiments of the present application further comprises a gravity sensor, one end of the gravity sensor is connected to the base 6, and the other end is connected to the top surface of the damped device 4. It can be understood that the gravity sensor can be arranged at any position of the damped device 4 and electrically connected to the control device to obtain the mass of the damped device 4. According to the weight of the damped device 4 and the number of dampers 2, the pre-compression amount of the dampers 2 in the X, Y and Z directions can be calculated.

[0046] A specific embodiment is given below to verify the damping device by removing the influence of the related environment by the ANSYS modeling simulation method.

[0047] Step 1, obtain the stress curve of each axis of the damper 2 by mechanical experiment, as shown in Figure 3 , wherein, Figure 3 is the single-axis stress curve diagram of the damper according to the damping device embodiment. And obtain the damping ratio by kinematics experiment, the damping ratio is 0.13 when the excitation frequency is 125Hz in this embodiment.

[0048] Step 2, use the variable stiffness three-phase spring bushing (damper 2) to simplify the modal analysis of the nonlinear rubber damper 2. According to the initial placement state on the feet 1 of the base 6, the pre-compression amount is directly reflected on the stiffness curve, for example, when damping an electronic device, the pre-compression amount in each direction can be calculated according to the weight of the device and the number of dampers 2. In this embodiment, the axial pre-compression amount is 0.2mm, and the axial stress curve can be shifted left by 0.2mm, and the stiffness curve is corrected.

[0049] At the same time, the torsional stiffness curve is calculated based on the force curve of each axis. The calculation of torsional stiffness can be calculated based on the shape of the shock absorber 2. Taking a cylindrical shock absorber as an example, the torsional stiffness can be integrated to obtain T = K*r^2.

[0050] Step 3: Use ANSYS to perform vibration finite element analysis on the electronic device containing the vibration absorber 2 to analyze the environmental adaptability of the electronic device, including the following steps:

[0051] (1) Open ANSYS Workbench to build a vibration simulation system. The system consists of a modal analysis module and two vibration simulation modules.

[0052] (2) Input the properties of the materials required for the structural parts (excluding the nonlinear materials used for shock absorber 2) in the engineering data; import the geometric model in the geometric structure module; enter the model module and set the material and contact properties of the structural parts according to the actual equipment conditions; in particular, suppress the geometric model of the nonlinear shock absorber 2, add a bushing connection pair in its area, and input each axial force curve and torsional stiffness curve in sequence in the stiffness coefficient table; define the boundary conditions according to the installation form of the electronic equipment on the vibration device.

[0053] (3) Perform finite element analysis of the modal to complete the modal solution that includes more than 90% of the actual mass.

[0054] (4) Perform finite element analysis of the buffeting test, input the damping ratio of the shock absorber 2 through the structural damping β, and according to the vibration test conditions, such as Figure 4 As shown, set the PSD G acceleration. Figure 4 This is a radial acceleration response diagram obtained through testing of the vibration reduction device according to the embodiment of the present utility model.

[0055] Specifically, PSD G acceleration refers to the power spectral density (PSD) expressed in gravitational acceleration (g). It is a physical quantity that describes the relationship between the power energy of a random vibration signal and its frequency. In vibration analysis, PSD G acceleration represents the acceleration energy per unit frequency, typically expressed in g² / Hz. This representation helps ensure that random data can be compared independently of the data's frequency resolution.

[0056] (5) Solve and obtain the PSD G acceleration response of the vibration-damped equipment 4, such as Figure 5 As shown; at the same time, the maximum reaction force of the bushing connection pair is obtained. Among them, Figure 5 It is a radial acceleration response diagram obtained by finite element simulation of the vibration reduction device according to the embodiment of the present utility model.

[0057] Step 4, re-construct the simulation module, remove the damping device 4, add the maximum reaction force obtained in step 3 in the corresponding position, and perform finite element analysis on other devices remaining rigidly connected to the system, to analyze the environmental adaptability without damper 2.

[0058] By comparing the radial acceleration response graphs of the damper 2 of Figure 4 and Figure 5 It can be seen from the comparison of the radial acceleration response graphs of the damper 2 of the exemplary embodiments of the present application that the multiple test results of the radial acceleration response curve graph of the damper 2 are very consistent with the axial acceleration response curve graph of the finite element simulation calculation.

[0059] As can be seen from the above, the damper 2 provided by the exemplary embodiments of the present application has very good environmental adaptability, can be used for analyzing vibration through modal superposition method, avoids the problem that only the extremely large amount of transient method can be used for solving, and can greatly improve the efficiency of research work.

[0060] Those skilled in the art should understand that the above embodiments are only for clearly illustrating the present application, and are not intended to limit the scope of the present application. Based on the above disclosure, other changes or modifications can be made by those skilled in the art, and these changes or modifications are still within the scope of the present application.

Claims

1. A vibration damping device suitable for use in modal superposition method for vibration analysis, characterized by, The shock absorber comprises a bracket and a bushing, the bracket comprises a first cylinder and two first end plates, the two first end plates are respectively arranged at two ends of the first cylinder, and the bushing is made of rubber; The bushing is sleeved outside the first cylinder and between the two first end plates; The bushing comprises a second cylinder and two second end plates, the two second end plates are respectively arranged at two ends of the second cylinder, and each second end plate is attached to a surface of the corresponding first end plate facing the other first end plate; The orthographic projection of the second cylinder on the surface of the second end plate is located in the surface of the second end plate; The orthographic projection of the first end plate on the surface of the second end plate coincides with the surface of the second end plate; The shock absorbing device further comprises a base and a support leg supported at the bottom of the base; The support leg comprises a stepped hole, one of the first end plates of the bracket, the corresponding second end plate of the bushing and part of the second cylinder are embedded in the stepped hole; The shock absorbing device further comprises a connected column and a device to be damped inside the support leg, one end of the connected column is connected to the device to be damped, and the other end enters the cavity of the first cylinder near the first end plate of the device to be damped and extends to the other first end plate.

2. The damping device according to claim 1, characterized in that The cross section of the first cylinder and the two first end plates is circular.

3. The damping device of claim 1, wherein The cross section of the second cylinder and the two second end plates is circular.

4. The damping device of claim 1, wherein The ratio of the cross-sectional area of the second cylinder to the cross-sectional area of the second end plate is 1:

2.

5. The damping device of claim 1, wherein The number of support legs is multiple, and the multiple support legs are distributed along the circumference of the base; The shock absorbing device further comprises a device not to be damped, and the device to be damped and the device not to be damped are arranged in the space formed by the multiple support legs.

6. The damping device of claim 5, wherein The device to be damped is located above the device not to be damped.

7. The damping device of claim 5, wherein The device not to be damped is rigidly connected to the support leg.

8. The damping device of claim 7, wherein The shock absorbing device further comprises a control device for obtaining the compression amount of the bracket and the bushing in the axial direction.

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