A vibration damping device and its stiffness adjustment method, and a vibration damping system.

Abstract

This invention relates to a vibration damping device and its stiffness adjustment method, and a vibration damping system. Specifically, it relates to a vibration damping device and its stiffness adjustment method, and a vibration damping system incorporating the device, to address the problems of existing flange-sleeve type vibration dampers, such as excessive additional angular motion, difficulty in installation and adaptation, performance deviation due to installation stress, difficulty in designing three-dimensional equal stiffness, and the risk of breakage and delamination under large overloads. The invention includes a bracket, 2N damping pads, and N sleeves, washers, and fasteners, where N≥2. The bracket includes a support portion and a mounting portion; the support portion has N first mounting holes; the sleeve includes a base and a connecting portion; the damping pad includes a limiting portion and a plug-in portion; the outer wall of the plug-in portion abuts against the inner wall of the first mounting hole, and its inner wall abuts against the outer wall of the sleeve portion; one end of the limiting portion abuts against the surface of the bracket, and the other end abuts against the base; each fastener passes through a washer and a sleeve in sequence and is used to connect with the equipment to be damped.

Description

Technical Field

[0001] This invention relates to a vibration damping device and its stiffness adjustment method, and a vibration damping system, specifically to a vibration damping device, a stiffness adjustment method for the vibration damping device, and a vibration damping system containing the vibration damping device. Background Technology

[0002] With the development of electronic technology, electronic equipment has been widely used in aerospace, aviation, and shipbuilding. In these applications, electronic equipment not only needs to meet electrical performance specifications but also must be able to withstand harsh mechanical environments. During transportation, launch, and flight, equipment is subjected to various mechanical stresses such as impact, vibration, and overload. Among these, vibration and impact are the primary factors causing functional failure and structural damage to electronic equipment. To ensure the reliable operation of electronic equipment within a specified mission profile, vibration damping devices are typically installed to isolate and buffer external excitations, creating a favorable working environment.

[0003] Currently, typical vibration damping devices are mostly like... Figure 1 The flange-sleeve type vibration isolator is shown. This type of vibration isolator typically consists of three parts: a sleeve, a mounting flange, and a viscoelastic damping rubber material located between the two. The sleeve and mounting flange are both metal parts, and the viscoelastic damping rubber material is bonded to the sleeve and mounting flange with adhesive to form a single unit. In use, the mounting flange is installed on the electronic equipment component requiring vibration damping through its through-hole, while the sleeve is installed on an external support structure through its central threaded hole. This design achieves single-point vibration damping through a single mounting point; when external vibrations are transmitted to the viscoelastic damping rubber material, the damping properties of the rubber dissipate energy.

[0004] However, the aforementioned flange sleeve type vibration damper has the following obvious shortcomings in practical applications and engineering tests:

[0005] First, the additional angular motion is too large. Because this flange sleeve type vibration damper is a single-point installation and single-point vibration damping structure, when the electronic equipment to be damped tends to move in a vibration environment, it is easy to generate a large additional angular motion around this single point, which is not conducive to the attitude stability of the equipment.

[0006] Secondly, installation and adaptation difficulties exist. There is an assembly gap between the mounting holes and screws on the mounting flange of the flange-sleeve type vibration damper. When multiple flange-sleeve type vibration dampers are installed together, the relative distance tolerances between the threaded holes on each damper will accumulate. If the accumulated tolerance is too large, it will directly lead to severe misalignment of the external mounting holes, making assembly impossible; if the accumulated tolerance is small, although the screws can be forcibly tightened, it will introduce additional stress, forcing the rubber material to deform under pressure, ultimately changing the original technical specifications of the flange-sleeve type vibration damper and affecting the stability of its vibration damping performance.

[0007] Third, installation stress leads to performance deviation. During the screwing of the bolt into the sleeve threaded hole, the friction between the threads causes the viscoelastic damping rubber material to rotate, while the mounting flange is already fixed to the electronic equipment components requiring vibration damping. Therefore, the viscoelastic damping rubber material undergoes a certain degree of torsional deformation, which not only makes it difficult for the bolt to reach the specified tightening torque but also alters the dynamic characteristics of the flange sleeve vibration damper, affecting its performance consistency and removability.

[0008] Fourth, achieving triaxial equal stiffness is challenging. To prevent resonance caused by coupling with the natural frequency of the projectile structure, engineering requires that the vibration damping device have essentially the same frequency in the three orthogonal directions, i.e., achieving "triaxial equal stiffness." Once the shape and installation dimensions of the flange sleeve type vibration damper are determined, the overall structure is difficult to adjust. If the performance is adjusted only by changing the formula of the viscoelastic damping rubber material, the frequencies in the three directions will rise or fall synchronously, making it impossible to independently adjust the stiffness in any one direction.

[0009] Fifth, there is a risk of breakage and delamination under high overload conditions. Under low-frequency vibration or high overload environments, significant relative displacement occurs between the electronic equipment and the external support structure. On the one hand, the rubber material itself has limited strength and may be directly torn apart; on the other hand, since the metal and rubber rely on adhesive bonding, the bonding process and the adhesive strength itself can limit the likelihood of delamination at the joint surface, causing the sleeve, mounting plate, and damping rubber to detach from each other, ultimately resulting in a complete loss of vibration damping function. Summary of the Invention

[0010] The purpose of this invention is to solve the technical problems of existing flange sleeve type vibration dampers, such as excessive additional angular motion, difficulty in installation and adaptation, performance deviation caused by installation stress, difficulty in designing three-dimensional equal stiffness, and risk of fracture and delamination under large overload. The invention provides a vibration damping device and its stiffness adjustment method and vibration damping system.

[0011] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0012] A vibration damping device, characterized in that it comprises: a bracket, N sleeves, and N fasteners; wherein, N≥2;

[0013] The bracket includes a support part and a mounting part located in the middle of the support part; the support part is a plate-shaped structure with N first mounting holes evenly distributed around its center in the circumferential direction; the mounting part is a column structure with second mounting holes for connecting to an external support structure.

[0014] Each of the first mounting holes is provided with a pair of damping pads arranged symmetrically in the upper and lower parts; each damping pad includes a limiting part and a plug-in part connected coaxially; the limiting part and the plug-in part are both cylindrical structures and have a third through hole in the center; the outer wall of the plug-in part abuts against the inner wall of the first mounting hole.

[0015] Each of the sleeves includes a base and a sleeve that are coaxially fixed together; the base is a disc-shaped structure and the sleeve is a cylindrical structure, and the diameter of the base is larger than that of the sleeve; a first through hole is provided at the center of the base and the sleeve.

[0016] The sleeve portion passes sequentially through the third through holes of a pair of damping pads in the same first mounting hole, and the outer wall of the sleeve portion abuts against the inner wall of the third through hole of the damping pad.

[0017] In a pair of damping pads in the same first mounting hole, the lower end of the limiting part of the lower damping pad abuts against the base; the upper end of the limiting part of the upper damping pad abuts against a washer; the limiting part is used to limit the axial and radial displacement of the damping pad when subjected to large overload; the washer has a disc-shaped structure with a second through hole in the center.

[0018] Each of the aforementioned fasteners passes sequentially through the second through hole of the corresponding washer and the first through hole of the sleeve, and is then used to connect with the device to be vibration-damped.

[0019] Furthermore, the damping pad also includes a metal insert;

[0020] The metal insert is a stepped sleeve structure, which is located at the connection between the limiting part and the insertion part to reduce the wear of the damping pad.

[0021] Furthermore, N=2.

[0022] Furthermore, the outer diameter of the base and the outer diameter of the washer are equal, and the outer diameter of the base and the outer diameter of the washer are greater than the outer diameter of the limiting part; wherein, the specific dimensions can be determined by calculating the deformation of the damping pad.

[0023] Furthermore, the mounting part is a prism or cylinder structure;

[0024] The fastener is a screw or rivet.

[0025] Furthermore, the damping pad is made of viscoelastic damping rubber material;

[0026] The metal insert is a sulfide metal insert.

[0027] Furthermore, the edges of the prism are chamfered.

[0028] Meanwhile, the present invention also provides a method for adjusting the stiffness of a vibration damping device, which is characterized by including the following steps:

[0029] S1. Ensure that the damping pads in all first mounting holes of the vibration damping device, except for the first mounting hole in the one to be measured orientation, are in a rigid locked state to limit their elastic deformation; measure the frequency response value of the damping pads in the first mounting holes in the one to be measured orientation.

[0030] S2. Based on the measured frequency response value and the target stiffness required for the damping pad in the first mounting hole at the test location, determine whether the damping pad needs to be replaced; if yes, proceed to step S3; if no, proceed to step S4.

[0031] S3. Replace the pair of damping pads in the first mounting hole of the vibration damping device at the test location with a new pair of damping pads that meet the target stiffness; then, proceed to step S4.

[0032] S4. Ensure that the damping pads in all first mounting holes other than the first mounting hole in the next test position of the vibration damping device are in a rigid locked state, and measure the frequency response value of the damping pad in the first mounting hole in the next test position. Then return to step S2 until the stiffness of the damping device at the damping pads in the first mounting holes in all test positions has been adjusted, thus completing the stiffness adjustment of the vibration damping device.

[0033] Furthermore, step S0, which calibrates the stiffness and frequency response of the damping pad, is included before step S1:

[0034] Remove a pair of damping pads from one of the first mounting holes on the vibration damping device, and put the damping pads in the other first mounting holes into a rigid locked state.

[0035] Multiple damping pads are provided, each containing multiple pairs of damping pads with the same stiffness but different stiffnesses. Two damping pads are paired with the same stiffness and with different stiffnesses to form multiple pairs of damping pads with the same and different stiffness combinations. When two damping pads have different stiffnesses, they are installed by interchanging their top and bottom positions to calibrate as two independent stiffness combinations.

[0036] The multiple pairs of damping pads with the same and different stiffness combinations are sequentially installed into the first mounting hole after the damping pads have been removed.

[0037] The frequency response value within the first mounting hole was tested when the damping pads of each stiffness combination were installed on the vibration damping device, and the corresponding frequency response values ​​were recorded in sequence.

[0038] A table is constructed to compare the stiffness combinations of the damping pads with their corresponding frequency response values. Then, the disassembled pair of damping pads is installed back into the original first mounting hole, thus completing the calibration of the damping pads' stiffness and frequency response.

[0039] Step S3 is as follows:

[0040] According to the reference table constructed in step S0, replace a pair of damping pads in the first mounting hole of the vibration damping device at the test location with a new pair of damping pads that meet the target stiffness; then, execute step S4.

[0041] Meanwhile, the present invention also provides a vibration reduction system, including an external support structure and a device to be vibration-reduced, which is characterized in that it includes at least two of the above-mentioned vibration reduction devices;

[0042] The mounting part of each vibration damping device is connected to the external support structure via a connector;

[0043] After the fixing component of each vibration damping device passes through the second through hole of the corresponding washer and the first through hole of the sleeve in sequence, it connects with the device to be damped, thereby enabling the device to be damped to be suspended and supported on the external support structure through the vibration damping device.

[0044] Compared with the prior art, the present invention has the following beneficial technical effects:

[0045] 1. The present invention provides a vibration reduction device that achieves multi-point vibration reduction function at a single installation point by installing a multi-point vibration reduction structure, thereby making electronic equipment more capable of withstanding harsh mechanical environments and reducing additional angular motion.

[0046] 2. The present invention provides a vibration damping device, which simplifies the installation and adaptation of the vibration damping device by using replaceable damping pads, and can eliminate the performance deviation caused by installation stress. Furthermore, it can achieve a three-dimensional equal stiffness design by replacing damping pads of different diameters and materials.

[0047] 3. The present invention provides a vibration damping device, which, through the redesign of the structure of the vibration damping device, changes the installation and stress method of the rubber material, and can effectively prevent the risk of product performance changes, functional loss and mission failure caused by the breakage and delamination of the vibration damping device; it solves the problem of breakage and delamination of the vibration damping device in the mechanical environment of various mission profiles.

[0048] 4. The present invention provides a vibration damping device, which significantly improves the vibration resistance of the damping pad by making the outer diameter of the base and the outer diameter of the washer larger than the outer diameter of the limiting part of the damping pad, thereby extending the working life of the damping pad several times under extreme mechanical environments.

[0049] 5. The present invention provides a vibration damping device that eliminates wear between the support and the damping pad by embedding a sulfide metal insert inside the damping pad, enhances the wear resistance of the damping pad, ensures the integrity of the appearance of the damping pad, and improves the service life of the vibration damping device under high-level and long-term vibration environments.

[0050] 6. The present invention provides a method for adjusting the stiffness of a vibration damping device. By replacing damping pads with different stiffnesses according to the correlation between stiffness and frequency response, the replaceability of damping pads is increased, thereby improving the accuracy and lifespan of the vibration damping device.

[0051] 7. The present invention provides a vibration reduction system that supports and suspends electronic equipment components above an external support structure through at least two vibration reduction devices, thereby giving the electronic equipment components a stronger vibration damping effect and providing a new approach to vibration damping of electronic equipment components. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the flange sleeve type vibration damper in the background art;

[0053] Figure 2 This is a three-dimensional structural schematic diagram of a vibration reduction device according to Embodiment 1 of the present invention;

[0054] Figure 3 This is a three-dimensional structural schematic diagram of another embodiment 1 of the vibration reduction device of the present invention;

[0055] Figure 4 This is a cross-sectional view of a vibration damping device according to Embodiment 1 of the present invention (fixing component not shown).

[0056] Figure 5 This is a three-dimensional structural diagram of the support frame in Embodiment 1 of the vibration damping device of the present invention;

[0057] Figure 6 This is a cross-sectional view of the bracket in Embodiment 1 of the vibration damping device of the present invention;

[0058] Figure 7 This is a top view of the support frame in Embodiment 1 of the vibration damping device of the present invention;

[0059] Figure 8 This is a three-dimensional structural diagram of the sleeve in Embodiment 1 of the vibration damping device of the present invention;

[0060] Figure 9 This is a cross-sectional view of the sleeve in Embodiment 1 of the vibration damping device of the present invention;

[0061] Figure 10 This is a three-dimensional structural diagram of the damping pad in Embodiment 1 of the vibration reduction device of the present invention;

[0062] Figure 11This is a cross-sectional view of the damping pad in Embodiment 1 of the vibration reduction device of the present invention;

[0063] Figure 12 This is a three-dimensional structural diagram of the washer in Embodiment 1 of the vibration damping device of the present invention;

[0064] Figure 13 This is a cross-sectional view of a vibration damping device embodiment 2 of the present invention (fixing component not shown);

[0065] Figure 14 This is a cross-sectional view of the damping pad in Embodiment 2 of the vibration reduction device of the present invention.

[0066] The attached figures are labeled as follows:

[0067] 1-Bracket, 11-Support, 12-Mounting part, 13-First mounting hole, 14-Second mounting hole, 2-Sleeve, 21-Base, 22-Sleeve part, 3-Damping pad, 31-Limiting part, 32-Plug-in part, 33-Metal insert, 4-Washer, 5-Fixing part. Detailed Implementation

[0068] To make the objectives, advantages, and features of the present invention clearer, the following detailed description of a vibration damping device, its stiffness adjustment method, and vibration damping system, in conjunction with the accompanying drawings and specific embodiments, is provided. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0069] Example 1

[0070] This embodiment provides a vibration damping device, such as... Figures 2-4 As shown, it includes: a bracket 1, N sleeves 2, 2N damping pads 3, N washers 4, and N fasteners 5; wherein, N≥2. In this embodiment, N=2.

[0071] In other embodiments, N may also be 3, 4, or 5.

[0072] like Figures 5-7 As shown, the bracket 1 is made of metal and includes a support part 11 and a mounting part 12 located in the middle of the support part 11. The support part 11 is a plate-shaped structure (specifically a rectangular plate-shaped structure with rounded ends), and has N first mounting holes 13 evenly distributed around its center in the circumferential direction for fixing the device to be vibration damped; the mounting part 12 is a columnar structure (such as a prism structure or a cylindrical structure, with chamfers on the edges of the prism), and has second mounting holes 14 for connecting with an external support structure, thus forming a structure of single-point installation and multi-point vibration damping.

[0073] Each first mounting hole 13 contains a pair of damping pads 3 arranged symmetrically vertically. For example... Figure 10 , Figure 11 As shown, each damping pad 3 is made of viscoelastic damping rubber material, and each includes a coaxially connected limiting part 31 and a plug-in part 32; both the limiting part 31 and the plug-in part 32 are cylindrical structures with a third through hole in the center for the sleeve part 22 to pass through; the outer wall of the plug-in part 32 abuts against the inner wall of the first mounting hole 13; the diameter of the limiting part 31 is larger than the diameter of the plug-in part 32. The limiting part 31 is used to limit the axial and radial displacement of the damping pad 3 when subjected to large overloads.

[0074] like Figure 8 , Figure 9 As shown, each sleeve 2 is made of metal and includes a coaxially fixed base 21 and a sleeve portion 22. The base 21 has a disc-shaped structure, and the sleeve portion 22 has a cylindrical structure. The diameter of the base 21 is larger than that of the sleeve portion 22. A first through hole is provided at the center of the base 21 and the sleeve portion 22. The sleeve portion 22 passes through the third through holes of a pair of damping pads 3 in the same first mounting hole 13, and the outer wall of the sleeve portion 22 abuts against the inner wall of the third through hole of the damping pad 3. Among the pair of damping pads 3 in the same first mounting hole 13, the lower end of the limiting part 31 of the lower damping pad 3 abuts against the base 21; the upper end of the limiting part 31 of the upper damping pad 3 abuts against a washer 4. The pair of damping pads 3 installed in the same first mounting hole 13 have different material properties, sizes, or shapes to achieve asymmetric vibration damping stiffness.

[0075] In other embodiments, a pair of damping pads 3 installed in the same first mounting hole 13 have the same material properties, size or shape to facilitate the replacement of the damping pads 3.

[0076] like Figure 11 As shown, washer 4 is made of metal and has a disc-shaped structure with a second through hole in the center.

[0077] like Figures 2-4 As shown, the outer wall of the insertion part 32 abuts against the inner wall of the first mounting hole 13, and its inner wall abuts against the outer wall of the sleeve part 22; one end of the limiting part 31 abuts against the surface of the bracket 1, and the other end abuts against the base 21 or the washer 4. The outer diameter of the base 21 and the outer diameter of the washer 4 are equal, and the outer diameter of the base 21 and the outer diameter of the washer 4 are larger than the outer diameter of the limiting part 31 (the specific size is determined by calculating the deformation of the damping pad), in order to reduce the wear of the damping pad 3 and extend its service life.

[0078] Each fastener 5 is a metal rivet; each fastener 5 passes through the second through hole of the corresponding washer 4 and the first through hole of the sleeve 2 in sequence, and is used to connect with the device to be vibration damped (generally the bottom of the device to be vibration damped).

[0079] In other embodiments, if the fastener 5 is a screw, then a threaded structure adapted to the fastener 5 may also be provided in the first through hole and / or the second through hole.

[0080] The comparative experiment between this invention and a flange sleeve type vibration damper yielded the following results:

[0081] Under low-frequency, high-amplitude vibration test conditions of 20Hz~50Hz, the flange sleeve type vibration damper lost its function after 5 minutes of vibration, while the vibration damping device of this invention remained in good condition after 150 minutes of vibration under the same test conditions. When the test frequency coincided with the resonant frequency of the vibration damping device, the flange sleeve type vibration damper was damaged and lost its function after a few minutes of high-amplitude vibration of 15g, while the vibration damping device of this invention remained intact after 60 minutes of vibration under the same test conditions.

[0082] The present invention also includes a method for adjusting the stiffness of a vibration damping device, for adjusting the stiffness of the vibration damping device as described above, specifically including the following steps:

[0083] S1, Stiffness and frequency response calibration of damping pad 3:

[0084] S1.1 Remove a pair of damping pads 3 from one of the first mounting holes 13 on the vibration damping device, and make the damping pads 3 in the other first mounting holes 13 in a rigid locked state.

[0085] The rigid locked state can be achieved in the following ways:

[0086] Tighten the fastener 5 to its limit position so that the damping pad 3 is axially compressed and cannot undergo elastic deformation; or insert a rigid pad or rigid bracket between the bracket 1 and the base 21, and between the bracket 1 and the washer 4, so that the damping pad 3 does not undergo elastic deformation. The size of the rigid pad or rigid bracket can be set according to the gap between the bracket 1 and the base 21 and the washer 4.

[0087] S1.2 Provide multiple damping pads 3, which include multiple pairs of damping pads 3 with the same stiffness and different stiffnesses; pair two damping pads 3 with the same stiffness and different stiffnesses respectively to form multiple pairs of damping pads 3 with the same and different stiffness combinations; when the stiffnesses of the two damping pads 3 are different, install them in an interchangeable manner to calibrate them as two independent stiffness combinations.

[0088] S1.3. Install multiple pairs of damping pads 3 with the same and different stiffness combinations into the first mounting hole 13 after the damping pads 3 have been removed.

[0089] S1.4 Test the frequency response value in the first mounting hole 13 when the damping pad 3 of each stiffness combination is installed in the vibration reduction device, and record the corresponding frequency response values ​​in sequence.

[0090] S1.5 Construct a table comparing the stiffness combinations of the damping pads 3 with their corresponding frequency response values.

[0091] S1.6. Reinstall the disassembled pair of damping pads 3 back into the original first mounting hole 13 to complete the calibration of the stiffness and frequency response of the damping pads 3.

[0092] S2. Ensure that the damping pads 3 in all first mounting holes 13 except for one in the test position are in a rigid locked state to limit their elastic deformation; measure the frequency response value of the damping pads 3 in the first mounting holes 13 in the test position.

[0093] The principle for measuring the frequency response value at the first mounting hole 13 in the test orientation is as follows: Since N first mounting holes 13 are uniformly arranged circumferentially along the center of the support 11, each first mounting hole 13 corresponds to a test orientation (i.e., the direction from the center of the support 11 to the center of the first mounting hole 13). By independently adjusting the frequency response value at the first mounting hole 13 in this orientation, the stiffness of the damping pad 3 inside the first mounting hole 13 in this orientation can be independently adjusted, thereby achieving independent adjustment of the stiffness in each direction.

[0094] S3. Based on the measured frequency response value and the target stiffness required for the damping pad 3 in the first mounting hole 13 at the test location, determine whether the damping pad 3 needs to be replaced; if yes, proceed to step S4; if no, proceed to step S5.

[0095] S4. Replace the pair of damping pads 3 in the first mounting hole 13 of the vibration damping device at the test location with a new pair of damping pads 3 that meet the target stiffness; then, proceed to step S5; specifically:

[0096] According to the reference table constructed in step S0, replace a pair of damping pads 3 in the first mounting hole 13 of the vibration damping device at the test location with a new pair of damping pads 3 that meet the target stiffness; then, execute step S5.

[0097] S5. Ensure that the damping pads 3 in all first mounting holes 13 except the first mounting hole 13 in the next test position of the vibration damping device are in a rigid locked state, and measure the frequency response value of the damping pad 3 in the first mounting hole 13 in the next test position. Then return to step S3 until the stiffness of the damping device in the first mounting hole 13 in all test positions has been adjusted, and complete the stiffness adjustment of the vibration damping device.

[0098] The present invention provides a vibration reduction system, comprising an external support structure, a device to be vibration-reduced, and at least two of the above-mentioned vibration reduction devices;

[0099] The mounting section 12 of each vibration damping device is connected to the equipment to be damped via a connector;

[0100] After the fixing part 5 of each vibration damping device passes through the second through hole of the corresponding washer 4 and the first through hole of the sleeve 2 in sequence, it connects with the equipment to be damped, thereby making the equipment to be damped suspended and supported on the external support structure through the vibration damping device.

[0101] In other embodiments, the vibration damping devices are used in pairs (even numbers) or groups (even or odd numbers) to provide stable support for the equipment being damped.

[0102] Example 2

[0103] like Figure 13 As shown in Figure 14, the difference between this embodiment and Embodiment 1 is that:

[0104] The damping pad 3 also includes a metal insert 33; the metal insert 33 is a sulfide metal insert, which is a stepped sleeve structure, and is located at the connection between the limiting part 31 and the insertion part 32 to reduce the wear of the damping pad 3.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

Claims

1. A vibration damping device, characterized in that, include: A bracket (1), N sleeves (2), and N fasteners (5); where N ≥ 2; The bracket (1) includes a support part (11) and a mounting part (12) located in the middle of the support part (11); the support part (11) is a plate-shaped structure with N first mounting holes (13) evenly arranged around its center in the circumferential direction; the mounting part (12) is a column structure with second mounting holes (14) for connecting with an external support structure. Each of the first mounting holes (13) is provided with a pair of damping pads (3) arranged symmetrically in the upper and lower parts; each of the damping pads (3) includes a limiting part (31) and a plug-in part (32) connected coaxially; the limiting part (31) and the plug-in part (32) are both cylindrical structures and have a third through hole in the center; the outer wall of the plug-in part (32) abuts against the inner wall of the first mounting hole (13); Each of the sleeves (2) includes a base (21) and a sleeve (22) that are coaxially fixed together; the base (21) is a disc-shaped structure and the sleeve (22) is a cylindrical structure, and the diameter of the base (21) is larger than that of the sleeve (22); a first through hole is provided at the center of the base (21) and the sleeve (22); The sleeve (22) passes through the third through holes of a pair of damping pads (3) in the same first mounting hole (13) in sequence, and the outer wall of the sleeve (22) abuts against the inner wall of the third through hole of the damping pad (3). In the same first mounting hole (13), the lower end of the limiting part (31) of the lower damping pad (3) abuts against the base (21), and the upper end of the limiting part (31) of the upper damping pad (3) abuts against a washer (4); the washer (4) is a disc-shaped structure with a second through hole in its center. Each of the fasteners (5) passes through the second through hole of the corresponding washer (4) and the first through hole of the sleeve (2) in sequence, and is used to connect with the device to be vibration damped.

2. The vibration damping device according to claim 1, characterized in that: The damping pad (3) also includes a metal insert (33); the metal insert (33) is a stepped sleeve structure, which is located at the connection between the limiting part (31) and the insertion part (32) to reduce the wear of the damping pad (3).

3. The vibration damping device according to claim 2, characterized in that: The value of N is 2.

4. The vibration damping device according to any one of claims 1-3, characterized in that: The outer diameter of the base (21) is equal to that of the washer (4), and the outer diameter of the base (21) and the outer diameter of the washer (4) are greater than the outer diameter of the limiting part (31).

5. The vibration damping device according to claim 4, characterized in that: The mounting part (12) is a prism or cylinder structure; The fastener (5) is a screw or rivet.

6. The vibration damping device according to claim 4, characterized in that: The damping pad (3) is made of viscoelastic damping rubber material; The metal insert (33) is a sulfide metal insert.

7. The vibration damping device according to claim 5, characterized in that: The edges of the prism are chamfered.

8. A method for adjusting the stiffness of a vibration damping device, used to adjust the stiffness of the vibration damping device as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Make the damping pads (3) in the first mounting holes (13) of the vibration damping device, except for the first mounting hole (13) in the one to be measured position, in a rigid locked state to limit their elastic deformation; measure the frequency response value of the damping pads (3) in the first mounting holes (13) in the one to be measured position. S2. Based on the measured frequency response value and the target stiffness required for the damping pad (3) in the first mounting hole (13) at the test location, determine whether the damping pad (3) needs to be replaced; if yes, proceed to step S3; if no, proceed to step S4. S3. Replace the pair of damping pads (3) in the first mounting hole (13) of the vibration damping device at the test location with a new pair of damping pads (3) that meet the target stiffness; then, perform step S4. S4. Ensure that the damping pads (3) in all first mounting holes (13) except the first mounting hole (13) in the next test position of the vibration damping device are in a rigid locked state, and measure the frequency response value of the damping pads (3) in the first mounting hole (13) in the next test position. Then return to step S2 until the stiffness of the damping device in the first mounting hole (13) in all test positions has been adjusted, and complete the stiffness adjustment of the vibration damping device.

9. The method for adjusting the stiffness of the vibration damping device according to claim 8, characterized in that, Step S0 precedes step S1, where the stiffness and frequency response of the damping pad (3) are calibrated. Remove a pair of damping pads (3) from one of the first mounting holes (13) on the vibration damping device, and make the damping pads (3) in the other first mounting holes (13) in a rigid locked state; Multiple damping pads (3) are provided, and the multiple damping pads (3) contain multiple pairs of damping pads (3) with the same stiffness and different stiffnesses. Two of the damping pads (3) are paired with the same stiffness and different stiffnesses respectively to form multiple pairs of damping pads (3) with the same stiffness and different stiffnesses. When the stiffnesses of the two damping pads (3) are different, they are installed in an interchangeable manner to be calibrated as two independent stiffness combinations. The multiple pairs of damping pads (3) with the same and different stiffness combinations are sequentially installed into the first mounting hole (13) after the damping pads (3) have been removed; When the damping pad (3) of each stiffness combination of the vibration damping device is installed, the frequency response value in the first mounting hole (13) is tested respectively, and the corresponding frequency response values ​​are recorded in sequence. A table is constructed to compare the stiffness combination of the damping pads (3) with the corresponding frequency response values; then, the disassembled pair of damping pads (3) are installed back into the original first mounting hole (13) to complete the calibration of the stiffness and frequency response of the damping pads (3). Step S3 is as follows: According to the reference table constructed in step S0, replace a pair of damping pads (3) in the first mounting hole (13) of the vibration damping device at the test location with a pair of new damping pads (3) that meet the target stiffness; then, perform step S4.

10. A vibration damping system, comprising an external support structure and a device to be damped, characterized in that: Includes at least two vibration damping devices as described in any one of claims 1-7; The mounting part (12) of each vibration damping device is connected to the external support structure via a connector; After the fixing part (5) of each vibration damping device passes through the second through hole of the corresponding washer (4) and the first through hole of the sleeve (2) in sequence, it connects with the device to be damped, thereby making the device to be damped suspended and supported on the external support structure through the vibration damping device.

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