Design method of particle damping type fastener elastic strip

Abstract

The invention discloses a design method of a particle damping type fastener elastic strip, which comprises the following steps of: determining the configuration of the elastic strip, and determining the number and the position of cavities in the elastic strip based on the configuration of the elastic strip; determining the length of each cavity, and determining the inner diameter of each cavity; determining a filler in the cavity to obtain a design scheme of the particle damping type fastener elastic strip; and verifying the design scheme of the particle damping type fastener elastic strip. According to the design method of the particle damping type fastener elastic strip, the problem that a damping elastic strip in the prior art cannot achieve a good damping effect is solved, the design method is provided for a brand new particle damping type fastener elastic strip, and then the purposes that the elastic strip has a better damping effect and the resonance response amplitude of the elastic strip is reduced are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transit, and particularly to a design method for a particle damping type fastener clip. Background Art

[0002] The railway fastener system is a common structure for fixing rails. Among them, the clip is a key part in the fastener, which provides sufficient fastening force by clamping the rail, so as to effectively ensure the reliable connection between the rail and the subgrade under the rail for a long time and ensure the safe operation of the train. Existing research shows that with the increase of the train operation mileage, polygon wear appears in the circumferential direction of the wheel, and wavy wear also appears on the surface of the rail in some sections.

[0003] Wheel polygon and rail corrugation are special types of wheel-rail damage, which will cause the interaction between the vehicle and the track system to intensify, resulting in an increase in the vertical wheel-rail force and generating high-frequency vibration excitation between the wheel and the rail. When the vibration frequency is close to the natural frequency of the clip, it will cause the clip to resonate, seriously damage the clip, shorten its service life, and pose a hidden danger to the safety of high-speed train operation.

[0004] In the prior art, the applicant's prior application CN114309653A disclosed "3D printing railway fastener damping clip and its manufacturing method". This technology reserves cavities inside the clip through 3D printing technology and fills 18NI300 maraging steel powder in the cavities to improve the damping performance. However, with the continuous in-depth research, the applicant found that the prior art still cannot achieve good damping effect in actual use and has limited contribution to reducing the resonance response amplitude of the clip. Based on this, the applicant creatively proposed a new "particle damping type fastener clip" and filed a patent application on the same day as this case; this clip uses high-density and different particle size particles as fillers, which can significantly improve the damping of the clip itself and reduce the resonance response amplitude; since this technology is a new damping clip structure, there is no design method applicable to this clip in the prior art, and the design of its internal fillers cannot be completed through the prior art. Summary of the Invention

[0005] The present invention provides a design method for a particle damping type fastener clip to solve the problem that the damping clip in the prior art cannot achieve good damping effect, and to provide a design method for a new particle damping type fastener clip, so as to make the clip have better damping effect and reduce the resonance response amplitude of the clip.

[0006] The present invention is realized through the following technical solutions:

[0007] A design method for a particle damping type fastener clip includes the following steps:

[0008] S1. Determine the configuration of the elastic clip, and based on the configuration of the elastic clip, determine the number and positions of the cavities inside the elastic clip;

[0009] S2. Determine the lengths of the cavities and the inner diameters of the cavities;

[0010] S3. Determine the fillers inside the cavities to obtain the design scheme of the granular-damping type fastener elastic clip;

[0011] S4. Verify the design scheme of the granular-damping type fastener elastic clip.

[0012] Aiming at the problem that the damping elastic clip in the prior art cannot achieve a good damping effect, the present invention proposes a design method for a granular-damping type fastener elastic clip. This method first determines the configuration of the elastic clip, such as common configurations like W-type elastic clip, E-type elastic clip or fast elastic clip, etc., and then determines the number of cavities inside the elastic clip and the positions of each cavity; then determines the lengths and inner diameters of each cavity, and then determines the fillers inside the cavities, such as the material, size and ratio of the fillers, etc. Thus, the design scheme of the granular-damping type fastener elastic clip can be obtained, and finally, this design scheme is verified.

[0013] This method proposes a targeted and complete design method for the brand-new granular-damping type fastener elastic clip, filling the gap in the prior art; the granular-damping type fastener elastic clip designed by using this method has an excellent damping effect, can significantly reduce the amplitude of the resonance response of the elastic clip, and thus effectively reduce the damage of the elastic clip caused by resonance, which is beneficial to improving the driving safety of high-speed trains.

[0014] Further, the method for determining the number and positions of the cavities inside the elastic clip based on the configuration of the elastic clip includes:

[0015] Establish a finite element model based on the configuration of the elastic clip, conduct simulation, and obtain the vibration amplitude distribution during resonance in the assembled state of the elastic clip;

[0016] Set the cavities in the regions where the vibration amplitude exceeds the set threshold value to obtain the number and positions of the cavities.

[0017] This solution can be understood as conducting a finite element simulation on the elastic clip in the assembled state to obtain the vibration amplitude distribution of each region when the elastic clip resonates; then, according to the amplitude set threshold value set in advance, select the regions where the simulated amplitude exceeds the set threshold value, and use the positions of these regions as the cavity positions, so as to obtain the number of cavities and the positions of each cavity. The set threshold value of the vibration amplitude can be adaptively set according to the specific working conditions and is not limited here.

[0018] It can be seen that in this solution, cavities are set in the areas where the amplitude of the elastic strip is relatively large, and the granular fillers in the cavities provide a large energy dissipation capacity in these areas, thereby reducing the maximum amplitude of the elastic strip, reducing the vibration unevenness of the elastic strip, making the overall vibration of the elastic strip more gentle, and being more conducive to reducing the damage of the elastic strip caused by resonance.

[0019] Furthermore, the method for determining the length of each cavity includes:

[0020] Dividing the elastic strip into several sections according to straight sections and curved sections;

[0021] Judging the section where each cavity is located:

[0022] If the cavity is only in one section, design the length of the cavity so that the length of the cavity is less than the length of the section where it is located;

[0023] If the cavity is in at least two sections, design the length of the cavity so that the length of the cavity is less than the total length of the at least two sections.

[0024] In this solution, the elastic strip is first divided into several straight sections and curved sections according to its own structure, and then based on the cavity positions obtained in the previous steps, the section where each cavity is located is judged. Since the cavity extends along the direction of the elastic strip, when a certain cavity is only in one section, it is only necessary to make the length of the cavity less than the length of the section where it is located; when a certain cavity is in at least two adjacent sections, it is necessary to make the length of the cavity less than the total length of the corresponding at least two sections. This design method can ensure that the elastic strip maintains a good strength level on the premise of meeting the energy dissipation level of the elastic strip.

[0025] Furthermore, the method for determining the inner diameter of each cavity includes:

[0026] S201. Based on the length of each cavity, establish finite element models with different inner diameters of the cavity, conduct simulation simulations respectively, and obtain the relationship curve between the maximum stress of the elastic strip and the inner diameter of the cavity, and the relationship curve between the clamping force of the elastic strip and the inner diameter of the cavity;

[0027] S202. Substitute the designed clamping force of the elastic strip into the relationship curve between the clamping force of the elastic strip and the inner diameter of the cavity to obtain the maximum optional inner diameter of the cavity;

[0028] S203. Substitute the maximum optional inner diameter of the cavity into the relationship curve between the maximum stress of the elastic strip and the inner diameter of the cavity to obtain the maximum stress of the elastic strip corresponding to the maximum optional inner diameter of the cavity;

[0029] S204. Judge whether the maximum stress of the elastic strip corresponding to the maximum optional inner diameter of the cavity meets the allowable stress requirement of the elastic strip:

[0030] If it meets the requirement, use the current maximum optional inner diameter of the cavity as the inner diameter of each cavity;

[0031] If not satisfied, return to step S202 and iteratively decrease the maximum selectable inner diameter of the cavity.

[0032] The inner diameter of the cavity determined by this solution can be used for all cavities in the elastic clip. With the inner diameter of the cavity determined by this solution, under the premise that the maximum stress of the elastic clip meets the allowable stress of the material and the fastening force of the elastic clip meets the design requirements, the maximum inner diameter of the cavity can be obtained. This is conducive to arranging as much filler as possible inside the elastic clip to improve the energy dissipation level of the elastic clip, further enhance the self-damping of the elastic clip, and reduce the resonance response amplitude.

[0033] Among them, returning to step S202 and iteratively decreasing the maximum selectable inner diameter of the cavity means reselecting a smaller inner diameter as the maximum selectable inner diameter of the cavity and substituting it back into the relationship curve between the maximum stress of the elastic clip and the inner diameter of the cavity to obtain the new maximum stress of the elastic clip, and then determining whether the new maximum stress of the elastic clip meets the allowable stress requirement of the elastic clip. The step size of the iterative decrease can be adaptively set according to the specific working conditions and is not specifically limited here.

[0034] Furthermore, the filler in the cavity includes a number of first particles and second particles; the particle size of the first particles is larger than that of the second particles.

[0035] Filling the cavity of the elastic clip with first particles and second particles of different particle sizes. After the first particles are filled, there are gaps between the particles, and the second particles enter the aforementioned gaps, thereby significantly increasing the mutual friction between the particles and enhancing the self-damping of the elastic clip.

[0036] Furthermore, the method for obtaining the design solution of the elastic clip with particle damping includes:

[0037] S301. Determine the density of the filler;

[0038] S302. Determine the filling rate of the filler in each cavity;

[0039] S303. Determine the particle sizes of the first particles and the second particles respectively;

[0040] S304. Based on the density of the filler and the particle sizes of the first particles and the second particles respectively, determine the mass ratio of the second particles to the first particles.

[0041] Preferably, the determined density of the filler is greater than 10 g / cm 3 ; the filling rate of the filler in any cavity is 60% - 80%; the particle size of the first particles is 0.8 - 1.2 mm; the particle size of the second particles is less than or equal to 0.4 mm.

[0042] In the research process, the inventors of this case found that in addition to the mutual friction between particles, the mutual collision between particles also has a very strong energy dissipation effect. Therefore, in this solution, the total filling rate of the first particles and the second particles is clearly defined as 60% - 80%, ensuring that when the elastic clip is subjected to high-frequency vibration excitation, the particles inside can collide with each other, and further dissipate the energy transmitted to the elastic clip more significantly, significantly reducing the damage of the elastic clip caused by resonance, which is beneficial to improving the driving safety of high-speed trains.

[0043] In this solution, the first particles are the main energy-consuming units, and the second particles are the supplementary energy-consuming units. The second particles mainly dissipate energy by means of friction with the first particles. On the premise of a certain filling rate: if the particle size is too small, although the number of particles is large, the degree of collision between particles is weak, and the energy dissipation performance is relatively small; if the particle size is too large, although the degree of collision between particles is relatively strong, the number of particles is small, and the friction energy dissipation is small, so the energy dissipation performance is also relatively small. Therefore, this solution defines the particle size of the first particles as 0.8 - 1.2 mm. In this range, both the number of particles and the degree of collision can reach a relatively moderate state, which is beneficial to improving the energy dissipation performance. On this premise, the particle size of the second particles is less than or equal to 0.4 mm, which is more conducive to increasing the friction area and further optimizing the energy dissipation effect.

[0044] In addition, the inventors found in the research process that the greater the density of the particles filled in the cavity, the greater the friction energy dissipation. Therefore, this solution uses the first particles and the second particles with high density, which can accelerate the energy dissipation rate and further improve the damping performance. Of course, the specific material of the filler is not specifically limited in this solution, and existing materials that meet the density greater than 10 g / cm 3 can be applied.

[0045] Preferably, in any cavity, the mass ratio of the second particles to the first particles satisfies the following formula:

[0046]

[0047] In the formula: β is the mass ratio of the second particles to the first particles; m1 is the total mass of the first particles in this cavity; m2 is the total mass of the second particles in this cavity; ρ is the density of the filler; r1 is the average particle size of the first particles in this cavity; r2 is the average particle size of the second particles in this cavity.

[0048] This solution makes the mass ratio of the filler in each cavity meet this proportional requirement. At this ratio, the loss factor of the elastic clip can be at the maximum level, that is, the resonance effect of the elastic clip can be weakened to the greatest extent.

[0049] Furthermore, the method for verifying the design solution of the particle damping type fastener elastic clip includes:

[0050] S401. Under the design scheme of the particle damping type fastener clip, calculate the damping loss factor of the clip.

[0051] S402. Determine whether the damping loss factor meets the set requirements:

[0052] If it meets the requirements, use the current design scheme of the particle damping type fastener clip as the final design scheme;

[0053] If it does not meet the requirements, return to step S3 to obtain a new design scheme of the particle damping type fastener clip.

[0054] Among them, the set requirements for the damping loss factor can be adaptively set according to specific working conditions and are not specifically limited here. In addition, returning to step S3 to obtain a new design scheme of the particle damping type fastener clip means changing the design of the filling material in the cavity in step S3, such as changing the size, density or ratio of the filling material, etc., so as to optimize the design scheme of the particle damping type fastener clip, and iterate in this way until the damping loss factor of the clip can meet the set requirements.

[0055] Preferably, the damping loss factor of the clip is calculated by the following formula:

[0056]

[0057] In the formula: η is the damping loss factor; ρ is the density of the filling material; R1 is the average particle size of the first particles in all cavities; R2 is the average particle size of the second particles in all cavities; D is the inner diameter of the cavity; α is the filling rate of the first particles in all cavities; M1 is the total mass of the first particles in all cavities; β is the mass ratio of the second particles to the first particles.

[0058] This solution clearly defines the verification method for the design scheme of the particle damping type fastener clip and gives the calculation method for the damping loss factor of the fastener clip with particle filling material, which fully fills the gap in the prior art and ensures the operability of the design method of this application and is conducive to the popularization and application of this application.

[0059] It should be explained that α in this solution refers to the filling rate of the first particles in all cavities inside the clip under the current design scheme, that is, the ratio of the sum of the volumes of all the first particles to the sum of the volumes of all the cavities; when the filling rates of the first particles in each cavity are equal, α is equal to the filling rate of the first particles in any cavity.

[0060] Compared with the prior art, the present invention has at least the following advantages and beneficial effects:

[0061] 1. The design method of a granular damping type fastening clip of the present invention provides a targeted and complete design method for the brand-new granular damping type fastening clip, filling the gap in the prior art.

[0062] 2. The granular damping type fastening clip designed by this method has excellent damping effect, can significantly reduce the resonance response amplitude of the clip, and thus effectively reduce the damage of the clip caused by resonance, which is beneficial to improving the driving safety of high-speed trains.

[0063] 3. The present invention sets cavities in the areas where the amplitude of the clip is relatively large, and the granular fillers in the cavities provide a large energy dissipation capacity in these areas, thereby reducing the maximum amplitude of the clip and the vibration non-uniformity of the clip, making the overall vibration of the clip more gentle and more conducive to reducing the damage of the clip caused by resonance.

[0064] 4. The present invention can ensure that the clip maintains a good strength level on the premise of meeting the energy dissipation level of the clip.

[0065] 5. The present invention can obtain the maximum inner diameter of the cavity on the premise that the maximum stress of the clip meets the allowable stress of the material and the fastening force of the clip meets the design requirements, which is conducive to setting as many fillers as possible inside the clip to improve the energy dissipation level of the clip, further improving the self-damping of the clip and reducing the resonance response amplitude.

[0066] 6. The clip designed by the present invention can make the internal particles collide sufficiently with each other when being excited by high-frequency vibration, and thus dissipate the energy transmitted to the clip by resonance more efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0068] Figure 1 is a schematic flow chart of a specific embodiment of the present invention;

[0069] Figure 2 is a modal characteristic simulation diagram in a specific embodiment of the present invention;

[0070] Figure 3 is a schematic diagram when the clip configuration is of type W1 in a specific embodiment of the present invention;

[0071] Figure 4 is a schematic diagram when the clip configuration is of type E in a specific embodiment of the present invention;

[0072] Figure 5 is a cross-sectional view of a cavity in a specific embodiment of the present invention;

[0073] Figure 6 A cross-sectional view of another cavity in a specific embodiment of the present invention;

[0074] Figure 7 A relationship curve between the maximum stress of the elastic clip and the inner diameter of the cavity in a specific embodiment of the present invention.

[0075] Figure 8 A relationship curve between the clamping force of the elastic clip and the inner diameter of the cavity in a specific embodiment of the present invention.

[0076] Markings in the drawings and corresponding component names:

[0077] 1 - Elastic clip body, 2 - Cavity. Specific embodiments

[0078] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments and drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and do not limit the present invention. In the description of this application, it should be understood that orientation or positional relationships indicated by terms such as "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation on the protection scope of this application.

[0079] Embodiment 1:

[0080] A design method for a particle damping type fastener elastic clip, as Figure 1 shown, includes the following steps:

[0081] Step 1: Determine the elastic clip configuration, and based on the elastic clip configuration, determine the number and position of cavities inside the elastic clip.

[0082] In this embodiment, the elastic clip configuration can adopt existing mature configurations such as W-type elastic clips, E-type elastic clips or fast elastic clips.

[0083] In this embodiment, a finite element model is established based on the elastic clip configuration, and simulation is carried out to obtain the vibration amplitude distribution during resonance in the assembled state of the elastic clip; cavities are set in areas where the vibration amplitude exceeds a set threshold value to obtain the number and position of the cavities.

[0084] Taking the W1-type elastic clip as an example, static analysis of the elastic clip in the assembled state is carried out using finite element method to calculate the maximum stress of the elastic clip and extract the clamping force at the clamping end of the elastic clip; then dynamic analysis of the elastic clip in the assembled state is carried out using finite element method to calculate the modal characteristics in the assembled state of the elastic clip such asFigure 2 As shown Figure 2 In the left figure in the middle, it is the simulation result in the first-order mode, and in the right figure, it is the simulation result in the second-order mode. It can be seen that when the W1 type spring clip resonates, the vibration amplitudes of the side limbs and the middle limbs are relatively large, while the vibration amplitudes of the fastening end and the tail end are relatively small; therefore, the cavity arrangement position of the W1 type spring clip is as Figure 3 shown, and cavities 2 are arranged in the side limbs and the middle limbs, and the total number of cavities 2 is four.

[0085] Step 2: First, determine the lengths of the cavities: Divide the spring clip into several sections according to straight-line sections and curved sections; determine the sections where the cavities are located: If a cavity is only in one section, design the length of the cavity so that the length of the cavity is less than the length of the section where it is located; if a cavity is in at least two sections, design the length of the cavity so that the length of the cavity is less than the total length of the at least two sections.

[0086] After that, determine the inner diameters of the cavities:

[0087] S201: Based on the lengths of the cavities, establish finite element models with different cavity inner diameters, conduct simulation and simulation respectively, and obtain the relationship curve between the maximum stress of the spring clip and the cavity inner diameter as shown in Figure 7 , and the relationship curve between the fastening force of the spring clip and the cavity inner diameter as shown in Figure 8 . It should be noted that: Figure 7 In, the abscissa is the cavity inner diameter, the unit is mm, and the ordinate is the maximum stress of the spring clip, the unit is MPa or N / mm 2 ; Figure 8 In, the abscissa is the cavity inner diameter, the unit is mm, and the ordinate is the fastening force of the spring clip, the unit is kN;

[0088] S202: Substitute the designed fastening force of the spring clip into the relationship curve between the fastening force of the spring clip and the cavity inner diameter to obtain the maximum optional inner diameter of the cavity; in this embodiment, as shown in Figure 8 , the designed fastening force of the spring clip is 9 kN, and the maximum optional inner diameter of the corresponding cavity is 6.1 mm.

[0089] S203: Substitute the maximum optional inner diameter of the cavity into the relationship curve between the maximum stress of the spring clip and the cavity inner diameter to obtain the maximum stress of the spring clip corresponding to the maximum optional inner diameter of the cavity.

[0090] S204: Judge whether the maximum stress of the spring clip corresponding to the maximum optional inner diameter of the cavity meets the allowable stress requirement of the spring clip:

[0091] If it meets the requirement, use the current maximum optional inner diameter of the cavity as the inner diameter of each cavity;

[0092] If it does not meet the requirement, return to step S202 and iteratively decrease the maximum optional inner diameter of the cavity. In this embodiment, the iteration step size can be set to 0.1 mm.

[0093] Step 3: Determine the filler in the cavity to obtain the design scheme of the particle damping type fastener spring clip. Specifically, it includes:

[0094] S301: Determine the density of the filler;

[0095] S302: Determine the filling rate of the filler in each cavity;

[0096] S303: Determine the particle sizes of the first particles and the second particles respectively;

[0097] S304: Based on the density of the filler and the particle sizes of the first particles and the second particles respectively, and their mass ratio.

[0098] In this embodiment, the filler in the cavity includes a number of first particles and second particles; the particle size of the first particles is larger than that of the second particles. The first particles and the second particles are made of the same material, and the density is greater than 10 g / cm 3 ; the filling rate of the filler in any cavity is 60% - 80%; the particle size of the first particles is 0.8 - 1.2 mm; the particle size of the second particles is less than or equal to 0.4 mm.

[0099] In this embodiment, the mass ratio of the second particles to the first particles in any cavity satisfies the following formula:

[0100]

[0101] In the formula: β is the mass ratio of the second particles to the first particles; m1 is the total mass of the first particles in this cavity; m2 is the total mass of the second particles in this cavity; ρ is the density of the filler; r1 is the average particle size of the first particles in this cavity; r2 is the average particle size of the second particles in this cavity.

[0102] Step 4: Verify the design scheme of the particle damping type fastener spring clip. Specifically, it includes:

[0103] S401: Calculate the damping loss factor of the spring clip under the design scheme of the particle damping type fastener spring clip;

[0104] S402: Determine whether the damping loss factor meets the set requirements:

[0105] If it meets the requirements, use the current design scheme of the particle damping type fastener spring clip as the final design scheme;

[0106] If it does not meet the requirements, return to Step 3 to obtain the design scheme of the particle damping type fastener spring clip again.

[0107] Among them, the damping loss factor of the spring clip is calculated by the following formula:

[0108]

[0109] In the formula: η is the damping loss factor; ρ is the density of the filler; R1 is the average particle size of the first particles in all cavities; R2 is the average particle size of the second particles in all cavities; D is the inner diameter of the cavity; α is the filling rate of the first particles in all cavities; M1 is the total mass of the first particles in all cavities; β is the mass ratio of the second particles to the first particles.

[0110] Example 2:

[0111] A design method of a particle damping type fastener spring clip as described in Example 1, which is used to design a particle damping type fastener spring clip as shown in Figures 3 to 6 The designed particle damping type fastener spring clip includes: a spring clip body 1, and a plurality of cavities 2 are arranged in the spring clip body. The cavities are filled with a plurality of first particles and second particles. In this example, both the first particles and the second particles are spherical, and the particle size of the first particles is larger than that of the second particles.

[0112] In any one of the cavities, the total filling rate of the first particles and the second particles is 60% - 80%, preferably 70%.

[0113] In this example, the particle size of the first particles is 0.8 - 1.2 mm; the particle size of the second particles is less than or equal to 0.4 mm.

[0114] In this example, the materials of the first particles and the second particles are preferably lead particles.

[0115] This example can be used for configurations such as W-type spring clips, E-type spring clips or fast spring clips. When the spring clip body 1 is a W1-type spring clip, the arrangement of the cavities 2 can refer to Figure 3 , that is, cavities 2 are arranged in the side limbs and middle limbs of the W1-type spring clip; when the spring clip body 1 is an E-type spring clip, the arrangement of the cavities 2 can refer to Figure 4 , that is, cavities 2 are arranged in the two arc segments of the E-type spring clip.

[0116] For any one cavity, it extends along the direction of the spring clip body at the position where it is located.

[0117] In addition, the cavity can be in a strip shape as shown in Figure 5 , or in a wavy shape as shown in Figure 6 . Regardless of the structure of the cavity, in this example, the aspect ratio of each cavity is maintained within the range of 10:1 - 15:1.

[0118] The specific embodiments described above further elaborate on the object, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only for the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0119] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including", or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article, or device.

Claims

1. A design method for a particle damping fastener spring bar, characterized in that: The following steps are involved: S1. Determine a spring bar configuration, and determine the number and position of cavities inside the spring bar based on the spring bar configuration; S2. Determine the length of each cavity and the inner diameter of each cavity; S3, determining the filler in the cavity to obtain a design scheme for a particle damping fastener spring bar; S4. Verify the particle damping fastener spring bar design scheme.

2. A method for designing a particle damping fastener spring bar according to claim 1, characterized in that: The method for determining the number and position of cavities inside the spring bar based on the spring bar configuration includes: A finite element model was established based on the spring bar configuration, and simulation was performed to obtain the vibration amplitude distribution when the spring bar was assembled and in resonance; The cavities are arranged in areas where the vibration amplitude exceeds a set threshold value, and the number and position of the cavities are obtained.

3. The design method of a particle damping fastener spring bar according to claim 1, characterized in that: Methods for determining the length of each cavity include: Divide the elastic strip into several sections according to straight line segments and curved line segments; Determine the section where each cavity is located: If the cavity is only in one section, the length of the cavity is designed so that the length of the cavity is smaller than the length of the section in which it is located; If the cavity is within at least two sections, the length of the cavity is designed so that the length of the cavity is less than the total length of the at least two sections.

4. The design method of a particle damping fastener spring bar according to claim 1, characterized in that: Methods for determining the inner diameter of each cavity include: S201, based on the length of each cavity, establish a finite element model under different cavity inner diameters, perform simulations respectively, and obtain a relationship curve between the maximum stress of the spring clip and the cavity inner diameter, and a relationship curve between the spring clip buckle pressure and the cavity inner diameter; S202, substituting the designed buckle pressure of the spring bar into the relationship curve between the buckle pressure of the spring bar and the inner diameter of the cavity to obtain the optional maximum inner diameter of the cavity; S203, substituting the optional maximum inner diameter of the cavity into the relationship curve between the maximum stress of the elastic bar and the inner diameter of the cavity to obtain the maximum stress of the elastic bar corresponding to the optional maximum inner diameter of the cavity; S204, judging whether the maximum stress of the spring bar corresponding to the maximum inner diameter of the cavity satisfies the allowable stress requirement of the spring bar: If satisfied, the maximum inner diameter of the current cavity is used as the inner diameter of each cavity; If not satisfied, return to step S202 and iterate downward to determine the maximum inner diameter of the cavity.

5. The design method of a particle damping fastener spring bar according to claim 1, characterized in that: The filler in the cavity includes a plurality of first particles and second particles; the particle size of the first particles is larger than that of the second particles.

6. A method for designing a particle damping fastener spring bar according to claim 5, characterized in that: Methods for obtaining a design solution for a particle damping fastener spring clip include: S301, determining the density of the filler; S302, determining the filling rate of the filler in each cavity; S303, determining the particle size of the first particle and the second particle; S304 , determining a mass ratio of the second particles to the first particles based on the density of the filler and the particle sizes of the first particles and the second particles.

7. A method for designing a particle damping fastener spring bar according to claim 6, characterized in that: Determine that the density of the filler is greater than 10g / cm 3 ; The filling rate of the filler in any cavity is 60% to 80%; the particle size of the first particles is 0.8 to 1.2 mm; the particle size of the second particles is less than or equal to 0.4 mm.

8. A method for designing a particle damping fastener spring bar according to claim 6, characterized in that: In any cavity, the mass ratio of the second particles to the first particles satisfies the following formula: Wherein: β is the mass ratio of the second particles to the first particles; m1 is the total mass of the first particles in the cavity; m2 is the total mass of the second particles in the cavity; ρ is the density of the filler; r1 is the average particle size of the first particles in the cavity; r2 is the average particle size of the second particles in the cavity.

9. A method for designing a particle damping fastener spring bar according to claim 6, characterized in that: The method for verifying the particle damping fastener spring clip design scheme includes: S401, calculating the damping loss factor of the spring bar under the particle damping fastener spring bar design scheme; S402: Determine whether the damping loss factor meets the set requirements: If it is satisfied, the current particle damping fastener spring clip design scheme is used as the final design scheme; If not satisfied, return to step S3 to obtain the particle damping fastener spring bar design scheme again.

10. A method for designing a particle damping fastener spring bar according to claim 9, characterized in that: The damping loss factor of the spring bar is calculated by the following formula: Wherein: η is the damping loss factor; ρ is the density of the filler; R1 is the average particle size of the first particles in all cavities; R2 is the average particle size of the second particles in all cavities; D is the inner diameter of the cavity; α is the filling rate of the first particles in all cavities; M1 is the total mass of the first particles in all cavities; β is the mass ratio of the second particles to the first particles.

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