A braided damping vibration absorber and a design method thereof

Abstract

The present invention belongs to the technical field of passive vibration isolation, and specifically relates to a braided damping vibration absorber and a design method thereof, wherein the braided damping vibration absorber comprises an upper base plate, an upper pressure plate, a lower pressure plate, a lower base plate, and a damping structure which are arranged in sequence, wherein the upper base plate is fixedly connected to the upper pressure plate, and the lower pressure plate is fixedly connected to the lower base plate; a plurality of grooves arranged equidistantly are provided on both the upper pressure plate and the lower pressure plate; the damping structure is a braided structure, and the damping structure alternately passes through the grooves on the upper pressure plate and the lower pressure plate in sequence, and the damping structure is clamped by the upper pressure plate and the upper base plate fixed together, and the lower pressure plate and the lower base plate fixed together. The design method can parametrically design a braided damping vibration absorber according to usage requirements, and the braided damping vibration absorber can isolate vibration excitation while bearing the weight of the system itself, and by adjusting the material and size of the damping structure, the vibration system can have a certain suppression effect on vibrations in all directions.

Description

Technical Field

[0001] The present invention belongs to the technical field of passive vibration isolation, and particularly relates to a braided damping shock absorber and a design method thereof. Background Art

[0002] When an electronic device is working, environmental vibration will interfere with the circuit, cause fatigue damage to the structure, and affect the stability and safety of the system operation. Currently, commonly used passive shock absorbers such as rubber shock absorbers and air spring shock absorbers have a short working life and are not resistant to high temperatures, and have poor environmental adaptability. And commonly used passive vibration isolators made of metal materials, such as metal rubber shock absorbers, have a relatively complex preparation process and a relatively high cost; another example is a wire rope shock absorber, which has a large volume and is not suitable for working conditions with a small load of the vibration system. Therefore, designing a new type of braided damping shock absorber to meet the vibration reduction requirements in a small space is of great significance for ensuring the safe operation of the system and reducing production costs. Summary of the Invention

[0003] The present invention provides a braided damping shock absorber and a design method thereof, which can parametrically design the braided damping shock absorber according to the use requirements. The braided damping shock absorber can isolate vibration excitation while bearing the weight of the system itself, and by adjusting the material and size of the damping structure, the vibration system can have a certain inhibitory effect on vibrations in all directions.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a braided damping shock absorber, including an upper substrate, an upper pressing plate, a damping structure, a lower pressing plate, and a lower substrate arranged in sequence, wherein:

[0005] The upper substrate is fixedly connected to the upper pressing plate, and the lower pressing plate is fixedly connected to the lower substrate;

[0006] A plurality of equally spaced channels are opened on both the upper pressing plate and the lower pressing plate, and the channels on the upper pressing plate correspond to the channels on the lower pressing plate one by one;

[0007] The damping structure is a braided structure, and the damping structure alternately passes through the channels on the upper pressing plate and the lower pressing plate in sequence, and the damping structure is clamped by the upper pressing plate and the upper substrate fixed together and the lower pressing plate and the lower substrate fixed together.

[0008] As a further preference of the present invention, the braiding process of the damping structure includes plain weave and twill weave.

[0009] As a further preference of the present invention, the braiding types of the damping structure include a single-layer braided structure and a multi-layer braided structure, wherein:

[0010] The single-layer braided structure is planar net-shaped or cylindrical;

[0011] The multi-layer woven structure is obtained by folding a single-layer woven structure in a planar network to obtain a multi-layer network woven structure, or by rolling a single-layer woven structure in a cylindrical shape to obtain a multi-layer planar woven structure.

[0012] As a further preference of the present invention, the damping structure material is metal.

[0013] As a further preference of the present invention, at least four threaded holes are machined on the upper pressing plate and the lower pressing plate, and at least four through holes are machined on the upper substrate and the lower substrate, and the threaded holes and the through holes correspond to each other one by one.

[0014] A design method of a woven damping shock absorber is also provided. The current working condition is that the vibration system is excited by random vibration in the frequency range of f 1 ~f 2 , the root mean square value of the vibration acceleration is G rms , the installation dimensions of the damping shock absorber reserved in the vibration system are length, width, and height of X 0 , Y 0 , Z 0 , the load mass of the vibration system is m, and according to the shock absorption principle, the required frequency of the current vibration system is f, and f satisfies The design method includes the following steps:

[0015] Step S1: Select the weaving type of the damping structure according to the load mass m and the vibration level of the vibration system. The specific selection method is as follows:

[0016] When the load mass m > 1000 g or the root mean square value of the vibration acceleration is G rms > 10 g, the damping structure is selected as a multi-layer woven structure;

[0017] When the load mass m ≤ 1000 g or the root mean square value of the vibration acceleration is G rms ≤ 10 g, the damping structure is selected as a single-layer woven structure;

[0018] Step S2: Select the damping structure with the corresponding mesh number according to the value of the load mass m;

[0019] Step S3: Preset the length, width, and height of the upper substrate, the lower substrate, the upper pressing plate, and the lower pressing plate:

[0020] Step S3-1: It is known that the length, width, and height of the installation space of the damping shock absorber reserved in the vibration system are X 0 , Y 0 , Z 0 ; According to the length X 0 and width Y 0 of the reserved installation space of the damping shock absorber, determine that the length of the upper substrate and the lower substrate is X 1 , the width is Y 1 , X1 and Y 1 Satisfy X 1 = X 0 ,Y 1 = Y 0 ;

[0021] According to the determined length X of the upper substrate and the lower substrate 1 ,width Y 1 ,determine that the length of the upper pressing plate and the lower pressing plate is X 2 ,width is Y 2 ,X 2 and Y 2 Satisfy X 2 = X 1 = X 0 ,Y 2 = Y 1 = Y 0 ;

[0022] Step S3-2, according to the height Z of the reserved damping shock absorber installation space in the vibration system 0 ,determine that the height of the upper substrate and the lower substrate is Z 1 ,the height of the upper pressing plate and the lower pressing plate is Z 2 ,Z 1 and Z 2 Satisfy Z 2 = Z 1 ;

[0023] Z 1 、Z 2 、Z 0 Satisfy:

[0024] 2Z 1 + 2Z 2 + h = Z 0 Formula 1, where h is the distance between the upper pressing plate and the lower pressing plate;

[0025] Step S3-3, preset the height Z of the upper substrate and the lower substrate 1 、the height Z of the upper pressing plate and the lower pressing plate 2 ,calculate the preset distance between the upper pressing plate and the lower pressing plate as h according to Formula 1 in Step S3-2 1 ;

[0026] Step S4, calculate the total stiffness k of the damping shock absorber:

[0027] According to the required frequency f of the current vibration system, the load mass m of the vibration system and the natural frequency formula, calculate that the total stiffness of the damping shock absorber is k. The specific calculation formula of the total stiffness k of the damping shock absorber is as follows:

[0028]

[0029] Step S5. Denote the number of channels provided on the upper pressing plate and the lower pressing plate as n, and take Combined with the total stiffness k of the damping shock absorber obtained in step S4, calculate the single-layer stiffness k when the damping structure passes through a channel on the upper pressing plate and a channel on the lower pressing plate 0 , and the calculation formula is as follows:

[0030] k = nk 0 Formula 3

[0031] Step S6. Preset the width and thickness of the damping structure:

[0032] Step S6-1. When the single-layer braided structure is selected in step S1, determine that the specification of the threaded hole is M2; when the multi-layer braided structure is selected in step S1, determine that the specification of the threaded hole is M3. Denote the aperture of the threaded hole required for the current working condition as a';

[0033] Step S6-2. Preset the distance between the threaded hole on the upper pressing plate and the short side of the upper pressing plate and the distance between the threaded hole on the lower pressing plate and the short side of the lower pressing plate as l 1 , and the linear distance between the threaded hole on the upper pressing plate and its closest channel and the linear distance between the threaded hole on the lower pressing plate and its closest channel are both l 2 ;

[0034] Step S6-3. Preset that the distance between adjacent channels is equal to the width of the channel, and calculate the upper limit value a of the preset thickness of the damping structure 1 , and the calculation formula is as follows:

[0035]

[0036] Step S6-4. Preset the distance between the threaded hole on the upper pressing plate and the long side of the upper pressing plate and the distance between the threaded hole on the lower pressing plate and the long side of the lower pressing plate as l 3 , and the linear distance between the threaded hole on the upper pressing plate and the tangent line at one end of its closest channel and the linear distance between the threaded hole on the lower pressing plate and the tangent line at one end of its closest channel are both l 4 ;

[0037] Step S6-5. Preset the width b of the damping structure 1 , and the calculation formula is as follows:

[0038] b 1 = Y 0 - 2×(a'+l 3 + l 4 ) Formula 5

[0039] Step S7. Obtain the single-layer stiffness k' when the damping structure designed for the current working condition passes through a channel on the upper pressing plate and a channel on the lower pressing plate0 :

[0040] Step S7-1: Preset the folding layer number s of the damping structure to 1:

[0041] Step S7-2: According to the value of n obtained in Step S5, the length, width, and height of the preset damping structure, and the value of the folding layer number s obtained in Step S7-1, through theoretical or simulation or mechanical tests, the single-layer stiffness k corresponding to this preset can be calculated. i , where i is the preset total number of times;

[0042] Step S7-3: Compare the k obtained in Step S7-2 i with the k obtained in Step S5 0 ;

[0043] Step S7-4: Obtain the single-layer stiffness k' of the damping structure to be designed under the current working condition 0 , with the following working conditions:

[0044] When the single-layer braided structure is selected in Step S1:

[0045] After comparison in Step S7-3, if k i <0.9k 0 or k i >1.1k 0 , then repeat Step S5 to revalue n until k i and k 0 satisfy 0.9k 0 ≤k i ≤1.1k 0 , and the k that satisfies 0.9k 0 ≤k i ≤1.1k 0 is the single-layer stiffness k' of the damping structure to be designed under the current working condition i ; 0 ;

[0046] When the multi-layer braided structure is selected in Step S1:

[0047] After comparison in Step S7-3, if k i <0.5k 0 or k i >2k 0 , then repeat Step S7-1 to revalue the folding layer number s of the damping structure until k i and k 0 satisfy 0.5k 0 ≤k i ≤2k 0 ;

[0048] After revaluing s, ki With k 0 Satisfying 0.5k 0 ≤k i <0.9k 0 Or 1.1k 0 <k i ≤2k 0 , then repeat step S5 to re - value n until k i With k 0 Satisfying 0.9k 0 ≤k i ≤1.1k 0 , satisfying 0.9k 0 ≤k i ≤1.1k 0 The k i That meets the requirements is the single - layer stiffness k' of the damping structure designed for the current working condition 0 ;

[0049] After re - valuing s, k i With k 0 Satisfying 0.9k 0 ≤k i ≤1.1k 0 , that is, satisfying 0.9k 0 ≤k i ≤1.1k 0 The k i That meets the requirements is the single - layer stiffness k' of the damping structure designed for the current working condition 0 ;

[0050] Step S8, according to the single - layer stiffness k' of the damping structure designed for the current working condition obtained in step S7 - 4 0 And the corresponding length, width, and height of the damping structure, determine the length, width, and thickness of the channel:

[0051] Channel width A = a i + a”, where a i Is the designed thickness of the damping structure obtained after i times of presetting, and a” is the difference between the channel width and the damping structure thickness, a” < 0.5mm;

[0052] Channel length B = b i + b”, where b i Is the designed width of the damping structure after i times of presetting, and b” is the difference between the channel length and the damping structure width, b” < 0.5mm;

[0053] Step S9, according to the installation space reserved for the damping shock absorber in the vibration system, the single - layer stiffness k' of the damping structure designed for the current working condition obtained in step S7 0 And the length, width, and thickness of the channel determined in step S8, manufacture the required braided damping shock absorber.

[0054] As a further preference of the present invention, in step S2, the selection method of the mesh number is as follows:

[0055] When the load mass m is in the range of 1 - 50 g, the mesh number of the damping structure is selected as 300;

[0056] When the load mass m is in the range of 51 - 200 g, the mesh number of the damping structure is selected as 200;

[0057] When the load mass m is in the range of 201 - 500 g, the mesh number of the damping structure is selected as 100;

[0058] When the load mass m is above 500 g, the mesh number of the damping structure is selected as 60.

[0059] As a further preference of the present invention, in step S5, n takes and n needs to be an integer. When is a non - integer, n takes the integer part of.

[0060] As a further preference of the present invention, the specific adjustment method in step S7 - 4 is as follows:

[0061] When the single - layer woven structure is selected in step S1:

[0062] After comparison in step S7 - 3, k i <0.9k 0 , re - preset the value of n, and n satisfies Repeat steps S5 to S7 - 4 until 0.9k 0 ≤k i ≤1.1k 0 , and the k that satisfies 0.9k 0 ≤k i ≤1.1k 0 is the single - layer stiffness k’ of the damping structure designed for the current working condition i ; 0 ;

[0063] After comparison in step S7 - 3, k i >1.1k 0 , re - preset the value of n, and n satisfies Repeat steps S5 to S7 - 4 until 0.9k 0 ≤k i ≤1.1k 0 , and the k that satisfies 0.9k 0 ≤k i ≤1.1k 0 is the single - layer stiffness k’ of the damping structure designed for the current working condition i ;0 ;

[0064] When the multi-layer braided structure is selected in step S1:

[0065] Step S7-3 compares and obtains k i <0.5k 0 , reset the value of the number of folding layers s of the damping structure in step S6-1, repeat step S6-1, and re-take the value of s, the value of s satisfies the first repetition s is 2, the second repetition s is 3, and the third repetition s is 4;

[0066] s is revalued to 0.9k 0 ≤k i ≤1.1k 0 , then 0.9k 0 ≤k i ≤1.1k 0 of k i The single-layer stiffness k' of the damping structure designed for the current working conditions 0 ;

[0067] s is revalued to 0.5k 0 <k i <0.9k 0 , and then reset the value of n, n satisfies Repeat steps S5 to S7-4 until 0.9k 0 ≤k i ≤1.1k 0 , meet 0.9k 0 ≤k i ≤1.1k 0 of k i The single-layer stiffness k' of the damping structure designed for the current working conditions 0 ;

[0068] Step S7-3 compares and obtains k i >2k 0 , reset the value of the number of folding layers s of the damping structure in step S7-1, repeat step S7-1, and re-take the value of s, the value of s satisfies the first repetition s is 2, the second repetition s is 3, and the third repetition s is 4;

[0069] s is revalued to 0.9k 0 ≤k i ≤1.1k 0 , then 0.9k 0 ≤k i ≤1.1k 0 of k i The single-layer stiffness k' of the damping structure designed for the current working conditions 0 ;

[0070] After re - obtaining the value of s, it gets 1.1k 0 <k i <2k 0 , then re - preset the value of n, and n satisfies Repeat step S5 to step S7 - 4 until 0.9k 0 ≤k i ≤1.1k 0 , that is, when it satisfies 0.9k 0 ≤k i ≤1.1k 0 The k i is the single - layer stiffness k' of the damping structure designed for the current working condition 0 .

[0071] Through the above - mentioned technical solutions, compared with the prior art, the present invention has the following beneficial effects:

[0072] 1. The braided damping shock absorber of the present invention uses the braided structure as the filter screen as the damping structure of the present invention. The braided structure has a relatively small stiffness, which can effectively reduce the resonance frequency of the vibration system, making the shock absorber have a wider vibration - damping frequency band; at the same time, when the warp and weft filaments of the braided structure work, they rub against each other, providing dry - friction damping for the shock absorber, suppressing the displacement amplitude in the low - frequency band and prolonging the service life of the damping structure.

[0073] 2. The braided damping shock absorber of the present invention needs to design the shock absorber according to the system response requirements to avoid structural failure and at the same time avoid performance over - surplus to control the quality and cost of the shock absorber; specifically, by presetting the length, width, and height of the upper substrate, lower substrate, upper pressing plate, and lower pressing plate, presetting the value of the number n of the channels set on the upper pressing plate and the lower pressing plate, presetting the width and thickness of the damping structure, and the value of the folding layer number s, according to the value of n, the preset width and thickness of the damping structure, and the value of the folding layer number s, through theoretical or simulation or mechanical tests, the single - layer stiffness k i , i is the total number of presets, compare k i with the single - layer stiffness k 0 when the damping structure passes through the channels of an upper pressing plate and a lower pressing plate. During the comparison, by adjusting the values of n and s, finally obtain the k 0 ≤k i ≤1.1k 0 The k i is the single - layer stiffness k' of the damping structure designed for the current working condition 0 .

[0074] 3. The braided damping shock absorber of the present invention can be made of metal, has good environmental adaptability, high stability, and a long storage life;

[0075] 4. The braided damping shock absorber of the present invention has a compact structure, is easy to process, and has a low processing cost;

[0076] 5. The braided damping shock absorber of the present invention has low stiffness in all directions, a low resonance frequency, a wide damping frequency range, and a low resonance magnification factor, and can isolate vibration excitations in multiple directions. Brief Description of the Drawings

[0077] The present invention will be further described below in conjunction with the drawings and embodiments.

[0078] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0079] Figure 2 is a schematic diagram of the structure of the upper pressure plate or the lower pressure plate of the present invention;

[0080] Figure 3 is the present invention Figure 2 A - A sectional view in the present invention;

[0081] Figure 4 is a schematic diagram of the planar structure when the damping structure of the present invention is plain weave;

[0082] Figure 5 is a schematic diagram of the sectional structure when the damping structure of the present invention is plain weave;

[0083] Figure 6 is a schematic diagram of the planar structure when the damping structure of the present invention is twill weave;

[0084] Figure 7 is a schematic diagram of the sectional structure when the damping structure of the present invention is twill weave;

[0085] Figure 8 is a schematic diagram of the structure of the single - layer plain - weave damper of the present invention.

[0086] In the figure: 1. Upper substrate; 2. Upper pressure plate; 3. Damping structure; 4. Lower pressure plate; 5. Lower substrate; 6. Channel. Detailed Embodiment

[0087] The present invention will now be further described in detail in conjunction with the drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0088] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "left side", "right side", "upper part", "lower part", etc. is based on the orientation or positional relationship shown in the drawings. It is 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. "First", "second", etc. do not represent the importance of components, so it cannot be understood as a limitation to the present invention. The specific dimensions adopted in this embodiment are only for illustrating the technical solution by way of example and do not limit the protection scope of the present invention.

[0089] Embodiment 1

[0090] This embodiment provides a preferred implementation scheme, a braided damping shock absorber, as Figures 1 to 5 shown. The braided damping shock absorber includes an upper substrate 1, an upper pressing plate 2, a damping structure 3, a lower pressing plate 4, and a lower substrate 5 arranged in sequence, wherein:

[0091] The above-mentioned upper substrate 1 is fixedly connected to the upper pressing plate 2, and the lower pressing plate 2 is fixedly connected to the lower substrate 5. Further, at least two threaded holes are processed on the upper pressing plate 2 and the lower pressing plate 4, and at least two through holes are processed on the upper substrate 1 and the lower substrate 5, and the threaded holes and the through holes are coaxial. Specifically, by installing screws at the threaded holes and the through holes, the upper substrate 1 is fixedly connected to the upper pressing plate 2, and the lower substrate 5 is fixedly connected to the lower pressing plate 4.

[0092] A plurality of equally spaced grooves 6 are opened on both the upper pressing plate 2 and the lower pressing plate 4. The damping structure 3 is a braided structure, and the damping structure 3 alternately passes through the grooves 6 on the upper pressing plate 2 and the lower pressing plate 4 in sequence, and the damping structure 3 is clamped by the upper pressing plate 2 and the upper substrate 1 fixedly connected together, and the lower pressing plate 4 and the lower substrate 5 fixedly connected together.

[0093] Specifically, the braiding process of the damping structure 3 includes plain weave and twill weave.

[0094] Specifically, the braiding types of the damping structure 3 include a single-layer braided structure and a multi-layer braided structure, wherein:

[0095] The single-layer braided structure is planar net-shaped or cylindrical. The multi-layer braided structure is obtained by folding the single-layer braided structure in a planar net shape to obtain a multi-layer net-shaped braided structure, or by rolling the single-layer braided structure in a cylindrical shape to obtain a multi-layer planar braided structure.

[0096] Specifically, the material of the damping structure 3 is metal. Preferably, the damping structure 3 is made of copper or steel.

[0097] This implementation scheme also provides a design method for a braided damping shock absorber. The current working condition is that the vibration system is at f 1 ~f 2Random vibration excitation within a frequency range, with the root mean square value of vibration acceleration being G rms , the installation dimensions of the damping shock absorber reserved in the vibration system, namely length, width, and height, are X 0 , Y 0 , Z 0 , the load mass of the vibration system is m. According to the vibration damping principle, the required frequency of the current vibration system is f, and f satisfies The described design method includes the following steps:

[0098] Step S1: According to the load mass m of the vibration system and the vibration level (i.e., the root mean square value of vibration acceleration), select the braiding type of the damping structure 3. The specific selection method is as follows:

[0099] When the load mass m > 1000g or the root mean square value of vibration acceleration is G rms > 10g, the damping structure 3 selects a multi-layer braiding structure;

[0100] When the load mass m ≤ 1000g or the root mean square value of vibration acceleration is G rms ≤ 10g, the damping structure 3 selects a single-layer braiding structure.

[0101] Step S2: According to the value of the load mass m, select the damping structure 3 with the corresponding mesh number. Specifically, the selection method of the mesh number is as follows:

[0102] When the load mass m is in the range of 1 - 50g, the mesh number of the damping structure is selected as 300;

[0103] When the load mass m is in the range of 51 - 200g, the mesh number of the damping structure is selected as 200;

[0104] When the load mass m is in the range of 201 - 500g, the mesh number of the damping structure is selected as 100;

[0105] When the load mass m is above 500g, the mesh number of the damping structure is selected as 60.

[0106] Step S3: Preset the length, width, and height of the upper substrate 1, lower substrate 5, upper pressing plate 2, and lower pressing plate 4:

[0107] Step S3 - 1: Given that the length, width, and height of the installation space of the damping shock absorber reserved in the vibration system are X 0 , Y 0 , Z 0 ;

[0108] According to the length X 0 , width Y 0 of the reserved installation space of the damping shock absorber, determine that the length of the upper substrate 1 and the lower substrate 5 is X 1 , width is Y 1 , X1 and Y 1 Satisfy X 1 = X 0 ,Y 1 = Y 0 ;

[0109] According to the determined length X of the upper substrate 1 and the lower substrate 5 1 ,width Y 1 ,determine that the length of the upper pressing plate 2 and the lower pressing plate 4 is X 2 ,width is Y 2 ,X 2 and Y 2 Satisfy X 2 = X 1 = X 0 ,Y 2 = Y 1 = Y 0 ;

[0110] Step S3-2, according to the height Z of the reserved damping shock absorber installation space in the vibration system 0 ,determine that the height of the upper substrate 1 and the lower substrate 5 is Z 1 ,the height of the upper pressing plate 2 and the lower pressing plate 4 is Z 2 ,Z 1 and Z 2 Satisfy Z 2 = Z 1 ;

[0111] Z 1 、Z 2 、Z 0 Satisfy:

[0112] 2Z 1 +2Z 2 +h = Z 0 Formula 1

[0113] In the formula, h is the distance between the upper pressing plate 2 and the lower pressing plate 4

[0114] Step S3-3, preset the height Z of the upper substrate 1 and the lower substrate 5 1 and the height Z of the upper pressing plate 2 and the lower pressing plate 4 2 The value, calculate the preset distance between the upper pressing plate 2 and the lower pressing plate 4 as h according to Formula 1 in Step S3-2 1 .

[0115] Step S4, calculate the total stiffness k of the damping shock absorber:

[0116] According to the required frequency f of the current vibration system, the load mass m of the vibration system and the natural frequency formula, calculate that the total stiffness of the damping shock absorber is k, and the calculation formula of the total stiffness k of the damping shock absorber is as follows:

[0117]

[0118] Step S5: Denote the number of channels 6 provided on the upper pressing plate 2 and the lower pressing plate 4 as n, and take Combined with the total stiffness k of the damping shock absorber obtained in step S4, calculate the single-layer stiffness k when the damping structure 3 passes through a channel 6 of the upper pressing plate 2 and a channel 6 of the lower pressing plate 4 0 , and the calculation formula is as follows:

[0119] k = nk 0 Formula 3;

[0120] Specifically, in step S5, n takes and n needs to be an integer. When is not an integer, n takes the integer part of.

[0121] Step S6: Preset the width and thickness of the damping structure 3:

[0122] Step S6-1: When the single-layer braided structure is selected in step S1, determine that the specification of the threaded hole is M2. When the multi-layer braided structure is selected in step S1, determine that the specification of the threaded hole is M3, and denote the aperture of the threaded hole required for the current working condition as a';

[0123] Step S6-2: Preset the distance between the threaded hole on the upper pressing plate 2 and the short side of the upper pressing plate 2 and the distance between the threaded hole on the lower pressing plate 4 and the short side of the lower pressing plate 4 as l 1 , and the linear distance between the threaded hole on the upper pressing plate 2 and its closest channel 6 and the linear distance between the threaded hole on the lower pressing plate 4 and its closest channel 6 are both l 2 ;

[0124] Step S6-3: Preset that the distance between adjacent channels 6 is equal to the width of the channel 6, and calculate the upper limit value a of the preset thickness of the damping structure 3 1 , and the calculation formula is as follows:

[0125]

[0126] In the formula, l 1 +l 2 ranges from 1 to 6 mm.

[0127] Step S6-4: Preset the distance between the threaded hole on the upper pressing plate 2 and the long side of the upper pressing plate 2 and the distance between the threaded hole on the lower pressing plate 4 and the long side of the lower pressing plate 4 as l 3 , and the linear distance between the threaded hole on the upper pressing plate 2 and the tangent line of one end of its closest channel 6 and the linear distance between the threaded hole on the lower pressing plate 4 and the tangent line of one end of its closest channel 6 are both l 4 ;

[0128] Step S6-5, width b of the preset damping structure 3 1 , the calculation formula is as follows:

[0129] b 1 = Y 0 - 2×(a’ + l 3 + l 4 ) Formula 5;

[0130] In the formula, l 3 + l 4 ranges from 1 to 6 mm.

[0131] Step S7, obtain the single-layer stiffness k’ when the damping structure 3 designed for the current working condition passes through a slot 6 of an upper pressing plate 2 and a slot 6 of a lower pressing plate 4 0 :

[0132] Step S7-1, assume the number of folding layers s of the damping structure 3 is 1:

[0133] Step S7-2, according to the value of n obtained in Step S5, the width and thickness of the preset damping structure, and the value of the number of folding layers s obtained in Step S7-1, through theory or simulation or mechanical tests, the single-layer stiffness k corresponding to this preset can be calculated i , where i is the total number of presets;

[0134] Step S7-3, compare the k i obtained in Step S7-2 with the k 0 obtained in Step S5;

[0135] Step S7-4, obtain the single-layer stiffness k’ of the damping structure 3 designed for the current working condition 0 , with the following working conditions:

[0136] When the single-layer braided structure is selected in Step S1:

[0137] After comparison in Step S7-3, if k i < 0.9k 0 or k i > 1.1k 0 , then repeat Step S5 to reselect the value of n until k i and k 0 satisfy 0.9k 0 ≤ k i ≤ 1.1k 0 , and the k 0 that satisfies 0.9k i ≤ k 0 ≤ 1.1k iThe single-layer stiffness k' of the damping structure 3 designed for the current working condition 0 ;

[0138] When the multi-layer braided structure is selected in step S1:

[0139] Compare k in step S7-3 i with k 0 to obtain k i < 0.5k 0 or k i > 2k 0 , then repeat step S7-1 to reassign the folding layer number s of the damping structure 3 until k i and k 0 satisfy 0.5k 0 ≤ k i ≤ 2k 0 ;

[0140] After reassigning s, if k i and k 0 satisfy 0.5k 0 ≤ k i < 0.9k 0 or 1.1k 0 < k i ≤ 2k 0 , then repeat step S5 to reassign n until k i and k 0 satisfy 0.9k 0 ≤ k i ≤ 1.1k 0 , satisfy 0.9k 0 ≤ k i ≤ 1.1k 0 The k i that meets the requirement is the single-layer stiffness k' of the damping structure 3 designed for the current working condition 0 ;

[0141] After reassigning s, if k i and k 0 satisfy 0.9k 0 ≤ k i ≤ 1.1k 0 , that is, satisfy 0.9k 0 ≤ k i ≤ 1.1k 0 The k i that meets the requirement is the single-layer stiffness k' of the damping structure 3 designed for the current working condition 0 .

[0142] Specifically, the specific adjustment method in step S7-4 is as follows:

[0143] When the single-layer braided structure is selected in step S1:

[0144] After comparison in step S7-3, k is obtained i <0.9k 0 , reset the value of n, and n satisfies Repeat steps S5 to S7-4 until 0.9k 0 ≤k i ≤1.1k 0 , and when 0.9k 0 ≤k i ≤1.1k 0 , the k i is the single-layer stiffness k' of the damping structure to be designed for the current working condition 0 ;

[0145] After comparison in step S7-3, k is obtained i >1.1k 0 , reset the value of n, and n satisfies Repeat steps S5 to S7-4 until 0.9k 0 ≤k i ≤1.1k 0 , and when 0.9k 0 ≤k i ≤1.1k 0 , the k i is the single-layer stiffness k' of the damping structure to be designed for the current working condition 0 ;

[0146] When the multi-layer braided structure is selected in step S1:

[0147] After comparison in step S7-3, k is obtained i <0.5k 0 , reset the value of the folding layer number s of the damping structure in step S6-1, repeat step S6-1, and re-take the value of s. The value of s satisfies that s takes 2 for the first repetition, s takes 3 for the second repetition, and s takes 4 for the third repetition;

[0148] After s is re-valued, 0.9k 0 ≤k i ≤1.1k 0 , then when 0.9k 0 ≤k i ≤1.1k 0 , the k i is the single-layer stiffness k' of the damping structure to be designed for the current working condition 0 ;

[0149] After s is re-valued, 0.5k 0 <k i <0.9k 0, and then reset the value of n, n satisfies Repeat steps S5 to S7-4 until 0.9k 0 ≤k i ≤1.1k 0 , meet 0.9k 0 ≤k i ≤1.1k 0 of k i The single-layer stiffness k' of the damping structure designed for the current working conditions 0 ;

[0150] Step S7-3 compares and obtains k i >2k 0 , reset the value of the number of folding layers s of the damping structure in step S7-1, repeat step S7-1, and re-take the value of s, the value of s satisfies the first repetition s is 2, the second repetition s is 3, and the third repetition s is 4;

[0151] s is revalued to 0.9k 0 ≤k i ≤1.1k 0 , then 0.9k 0 ≤k i ≤1.1k 0 of k i The single-layer stiffness k' of the damping structure designed for the current working conditions 0 ;

[0152] s is revalued to 1.1k 0 <k i <2k 0 , and then reset the value of n, n satisfies Repeat steps S5 to S7-4 until 0.9k 0 ≤k i ≤1.1k 0 , that is, 0.9k 0 ≤k i ≤1.1k 0 of k i The single-layer stiffness k' of the damping structure designed for the current working conditions 0 .

[0153] Step S8, the single-layer stiffness k' of the damping structure required for the current working condition obtained in step S7-4 0 The corresponding damping structure 3 length, width, and height determine the length, width, and thickness of the channel:

[0154] Groove 6 width A=a i +a”, a iThe design thickness of the damping structure 3 obtained after the i-th preset, a” is the difference between the width of the channel 6 and the thickness of the damping structure 3, and a” < 0.5 mm;

[0155] The length B of the channel 6 = b i + b”, b i is the design width of the damping structure 3 obtained after the i-th preset, b” is the difference between the length of the channel 6 and the width of the damping structure 3, and b” < 0.5 mm;

[0156] Step S9: According to the installation space reserved for the damping shock absorber in the vibration system, the single-layer stiffness k’ of the damping structure 3 designed for the current working condition obtained in step S7 0 and the length, width, and thickness of the channel 6 determined in step S8, manufacture the required braided damping shock absorber.

[0157] Those skilled in the art of this technology can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used here have the same meaning as the general understanding of those of ordinary skill in the field to which this application belongs. It should also be understood that terms defined in common dictionaries should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as here.

[0158] The meaning of “and / or” described in this application refers to the situation where each exists alone or both exist simultaneously.

[0159] The meaning of “connection” described in this application can be a direct connection between components or an indirect connection between components through other components.

[0160] Taking the ideal embodiments of the present invention as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A braided damping vibration absorber, characterized in that: It includes an upper base plate, an upper pressure plate, a damping structure, a lower pressure plate, and a lower base plate which are arranged in sequence, wherein: The upper base plate is fixedly connected to the upper pressing plate, and the lower pressing plate is fixedly connected to the lower base plate; The upper pressing plate and the lower pressing plate are provided with a plurality of grooves arranged at equal distances in the vertical direction, and the grooves on the upper pressing plate correspond to the grooves on the lower pressing plate one by one; The damping structure is a woven structure, the damping structure alternately passes through the grooves on the upper pressing plate and the lower pressing plate in sequence, and the damping structure is clamped by the upper pressing plate and the upper base plate fixed together, and the lower pressing plate and the lower base plate fixed together; The weaving process of the damping structure includes plain weaving and twill weaving; The weaving types of the damping structure include a single-layer weaving structure and a multi-layer weaving structure, wherein: The single-layer woven structure is a flat mesh or cylindrical shape; The multi-layer braided structure is a single-layer braided structure in a planar mesh shape, which is obtained by folding the multi-layer mesh braided structure, or a single-layer braided structure in a cylindrical shape, which is obtained by rolling the multi-layer planar braided structure. The damping structure material is metal; At least four threaded holes are processed on the upper pressing plate and the lower pressing plate, and at least four through holes are processed on the upper base plate and the lower base plate, and the threaded holes correspond to the through holes one by one.

2. The design method of a braided damping vibration absorber according to claim 1, characterized in that: The current working condition is that the vibration system is subjected to random vibration excitation in the frequency range of f1 to f2, and the root mean square value of the vibration acceleration is G rms The reserved damping shock absorber installation dimensions in the vibration system are X0, Y0, and Z0 respectively in length, width, and height. The load mass of the vibration system is m. According to the vibration reduction principle, the required frequency of the current vibration system is f, and f satisfies The design method comprises the following steps: Step S1: According to the load mass m and vibration magnitude of the vibration system, the weaving type of the damping structure is selected. The specific selection method is as follows: When the load mass m>1000g or the root mean square value of vibration acceleration is G rms When the load is greater than 10g, the damping structure uses a multi-layer braided structure; When the load mass m≤1000g or the root mean square value of the vibration acceleration is G rms When ≤10g, the damping structure uses a single-layer braided structure; Step S2, selecting a damping structure of corresponding mesh size according to the value of the load mass m; Step S3, preset the length, width and height of the upper substrate, the lower substrate, the upper pressing plate and the lower pressing plate: Step S3-1, it is known that the length, width and height of the damping vibration absorber installation space reserved in the vibration system are X0, Y0 and Z0 respectively; according to the length X0 and width Y0 of the reserved damping vibration absorber installation space, it is determined that the length of the upper base plate and the width of the lower base plate are X1 and Y1, and X1 and Y1 satisfy X1=X0, Y1=Y0; According to the determined length X1 and width Y1 of the upper substrate and the lower substrate, the length of the upper pressing plate and the lower pressing plate is determined to be X2 and the width is Y2, and X2 and Y2 satisfy X2=X1=X0, Y2=Y1=Y0; Step S3-2, according to the height Z0 of the damping absorber installation space reserved in the vibration system, determine the height of the upper base plate and the lower base plate as Z1, the height of the upper pressing plate and the lower pressing plate as Z2, and Z1 and Z2 satisfy Z2=Z1; Z1, Z2, and Z0 satisfy: 2Z1+2Z2+h=Z0 Formula 1: In the formula, h is the distance between the upper platen and the lower platen; Step S3-3, preset the height Z1 of the upper substrate and the lower substrate, and the height Z2 of the upper pressing plate and the lower pressing plate, and calculate the preset distance h1 between the upper pressing plate and the lower pressing plate according to Formula 1 in Step S3-2; Step S4, calculating the total stiffness k of the damping shock absorber: According to the required frequency f of the current vibration system, the load mass m of the vibration system and the natural frequency formula, the total stiffness of the damping shock absorber is calculated to be k. The specific calculation formula of the total stiffness k of the damping shock absorber is as follows: Step S5: record the number of grooves on the upper and lower pressing plates as n, and take Combined with the total stiffness k of the damping shock absorber obtained in step S4, the single-layer stiffness k0 of the damping structure passing through a groove of an upper pressing plate and a groove of a lower pressing plate is calculated, and the calculation formula is as follows: k=nk0 Formula 3 Step S6, preset the width and thickness of the damping structure: Step S6-1, when a single-layer braided structure is selected in step S1, the specification of the threaded hole is determined to be M2, and when a multi-layer braided structure is selected in step S1, the specification of the threaded hole is determined to be M3, and the diameter of the threaded hole required for the current working condition is recorded as a'; Step S6-2, presetting the spacing between the threaded hole on the upper pressing plate and the short side of the upper pressing plate and the spacing between the threaded hole on the lower pressing plate and the short side of the lower pressing plate to be l1, and the straight-line distance between the threaded hole on the upper pressing plate and the closest groove and the straight-line distance between the threaded hole on the lower pressing plate and the closest groove to be l2; Step S6-3, presetting the spacing between adjacent grooves to be equal to the width of the grooves, and calculating the preset thickness upper limit a1 of the damping structure, the calculation formula is as follows: Step S6-4, presetting the spacing between the threaded hole on the upper pressing plate and the long side of the upper pressing plate and the spacing between the threaded hole on the lower pressing plate and the long side of the lower pressing plate to be l3, and the straight-line distance between the threaded hole on the upper pressing plate and the tangent line of the closest end of the groove and the straight-line distance between the threaded hole on the lower pressing plate and the tangent line of the closest end of the groove to be l4; Step S6-5: preset the width b1 of the damping structure, and the calculation formula is as follows: b1=Y0-2×(a'+l3+l4) Formula 5 Step S7, obtaining the single-layer stiffness k0' of the damping structure designed for the current working condition when it passes through a groove of an upper pressing plate and a groove of a lower pressing plate: Step S7-1, the number of folding layers s of the preset damping structure is 1: Step S7-2: According to the value of n in step S5, the length, width, and height of the damping structure preset in step S6, and the value of the number of folded layers s in step S7-1, the single-layer stiffness k corresponding to this preset can be calculated through theory, simulation, or mechanical testing. i , i is the total number of preset times; Step S7-3: convert the k obtained in step S7-2 i Compare with k0 obtained in step S5; Step S7-4, obtaining the single-layer stiffness k0' of the damping structure required for designing the current working condition, with the following working conditions: When a single-layer braided structure is selected in step S1: Step S7-3: After comparison, get k i <0.9k0 or k i >1.1k0, then repeat step S5 and re-evaluate n until k i and k0 satisfies 0.9k0≤k i ≤1.1k0, satisfying 0.9k0≤k i k≤1.1k0 i The single-layer stiffness k0' of the damping structure designed for the current working condition; When a multi-layer braided structure is selected in step S1: Step S7-3: After comparison, get k i <0.5k0 or k i >2k0, then repeat step S7-1 and re-value the number of folding layers s of the damping structure until k i and k0 satisfies 0.5k0≤k i ≤2k0; After s is revalued, k i and k0 satisfies 0.5k0≤k i <0.9k0or1.1k0<k i ≤2k0, repeat step S5 and re-evaluate n until k i and k0 satisfies 0.9k0≤k i ≤1.1k0, satisfying 0.9k0≤k i k≤1.1k0 i The single-layer stiffness k0' of the damping structure designed for the current working condition; After s is revalued, k i and k0 satisfies 0.9k0≤k i ≤1.1k0, that is, 0.9k0≤k i k≤1.1k0 i The single-layer stiffness k0' of the damping structure designed for the current working condition; Step S8, determining the length, width and thickness of the channel according to the length, width and height of the damping structure corresponding to the single-layer stiffness k0' of the damping structure required to be designed for the current working condition obtained in step S7-4: Channel width A = a i +a”, a i is the design thickness of the damping structure obtained after i presets, a” is the difference between the channel width and the thickness of the damping structure, a”<0.5mm; Channel length B = b i +b", b i is the design width of the damping structure after i presets, b” is the difference between the channel length and the damping structure width, b”<0.5mm; Step S9, manufacturing the required braided damping vibration absorber according to the damping vibration absorber installation space reserved in the vibration system, the single-layer stiffness k0' of the damping structure designed for the current working condition obtained in step S7, and the length, width and thickness of the groove determined in step S8.

3. The design method of a braided damping vibration absorber according to claim 2 is characterized in that: In step S2, the mesh number is selected as follows: When the load mass m is in the range of 1-50g, the mesh number of the damping structure is selected as 300; When the load mass m is in the range of 51-200g, the mesh number of the damping structure is selected as 200; When the load mass m is in the range of 201-500g, the mesh number of the damping structure is selected as 100; When the load mass m is above 500g, the mesh number of the damping structure is selected to be 60.

4. The design method of a braided damping vibration absorber according to claim 3 is characterized in that: In step S5, n is And n needs to be rounded, when When n is a non-integer, The integer part of .

5. The design method of a braided damping vibration absorber according to claim 4 is characterized in that: The specific adjustment method in step S7-4 is as follows: When a single-layer braided structure is selected in step S1: Step S7-3: After comparison, get k i <0.9k0, reset the value of n, n satisfies Repeat steps S5 to S7-4 until 0.9k0≤k i ≤1.1k0, satisfying 0.9k0≤k i k≤1.1k0 i The single-layer stiffness k0' of the damping structure designed for the current working condition; Step S7-3: After comparison, get k i >1.1k0, reset the value of n, n satisfies Repeat steps S5 to S7-4 until 0.9k0≤k i ≤1.1k0, satisfying 0.9k0≤k i k≤1.1k0 i The single-layer stiffness k0' of the damping structure designed for the current working condition; When a multi-layer braided structure is selected in step S1: Step S7-3: After comparison, get k i <0.5k0, reset the value of the number of folded layers s of the damping structure in step S6-1, repeat step S6-1, and re-select the value of s, the value of s satisfying that s is 2 for the first repetition, 3 for the second repetition, and 4 for the third repetition; After re-taking the value of s, we get 0.9k0≤k i ≤1.1k0, then 0.9k0≤k i k≤1.1k0 i The single-layer stiffness k0' of the damping structure designed for the current working condition; After s is revalued, we get 0.5k0<k i <0.9k0, and then reset the value of n, n satisfies Repeat steps S5 to S7-4 until 0.9k0≤k i ≤1.1k0, satisfying 0.9k0≤k i k≤1.1k0 i The single-layer stiffness k0' of the damping structure designed for the current working condition; Step S7-3: After comparison, get k i >2k0, reset the value of the number of folded layers s of the damping structure in step S7-1, repeat step S7-1, and re-select the value of s, so that the value of s satisfies the requirement that s is 2 for the first repetition, 3 for the second repetition, and 4 for the third repetition; After re-taking the value of s, we get 0.9k0≤k i ≤1.1k0, then 0.9k0≤k i k≤1.1k0 i The single-layer stiffness k0' of the damping structure designed for the current working condition; After s is revalued, we get 1.1k0<k i <2k0, and then reset the value of n, n satisfies Repeat steps S5 to S7-4 until 0.9k0≤k i ≤1.1k0, that is, 0.9k0≤k i k≤1.1k0 i The single-layer stiffness k0' of the damping structure designed for the current working conditions.

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