Anti-symmetric rack beam type self-adaptive vibration absorption device and frequency modulation method thereof

Abstract

In the field of vibration absorbers, the invention provides an anti-symmetric rack beam type self-adaptive vibration absorption device and a frequency modulation method thereof, and the anti-symmetric rack beam type self-adaptive vibration absorption device comprises two seat plates which are arranged in parallel up and down; the upper rolling wheel is installed on the lower surface of the upper seat plate, the lower rolling wheel is installed on the upper surface of the lower seat plate, the first rack and the second rack are arranged between the two seat plates in parallel, the first rack and the second rack are respectively clamped by at least one rolling wheel set, and the first rack and the second rack are arranged in an antisymmetric mode; the gear is arranged between the first rack and the second rack, the gear is meshed with the first rack and the second rack, and when the gear rotates, the gear drives the two racks to move linearly relative to each other or move linearly opposite to each other at the same time; according to the invention, the effective length is adjusted through gear transmission so as to achieve the purpose of frequency modulation, the frequency modulation is accurate and stable, the structure is simple, the adaptability is high, the maintenance is convenient, and the cost performance is high.

Description

Technical Field

[0001] The invention belongs to the field of vibration absorbing devices, and in particular relates to an anti-symmetric rack beam type adaptive vibration absorbing device and a frequency modulation method thereof. Background Art

[0002] Vibration problems are common in all areas of engineering practice. They can have a negative impact on the structure of equipment and reduce its service life. Using a vibration absorber is a simple and effective way to control vibration. When the natural frequency of the vibration absorber is consistent with the vibration frequency of the target equipment, it can reduce the vibration amplitude of the target equipment at that frequency, which can achieve a good vibration reduction effect.

[0003] However, the natural frequency of the vibration absorber in the prior art cannot be adjusted, and the structural setting of the natural frequency of the vibration absorber can only be performed for a fixed vibration frequency, and the vibration absorber is not universal.

[0004] Therefore, the prior art has the following problems:

[0005] 1. The natural frequency of the vibration absorber cannot be adjusted adaptively;

[0006] 2. The natural frequency of the vibration absorber cannot be adjusted in real time;

[0007] 3. The vibration absorber is not universal. Summary of the invention

[0008] The present application aims to solve at least one of the technical problems in the related art to a certain extent. An embodiment of the present invention provides an antisymmetric rack beam type adaptive vibration absorption device and a frequency modulation method thereof, which can drive the gear to rotate through a stepper motor, thereby adjusting the effective length of the rack beam, changing its stiffness and thus realizing the adjustment of the natural frequency; at the same time, this vibration absorption device can also realize frequency adaptive adjustment by receiving and processing the sensor signal from the vibration mechanism through an external single-chip microcomputer.

[0009] The solution is as follows:

[0010] An antisymmetric rack beam type adaptive vibration absorbing device, comprising:

[0011] Two seat plates, the two seat plates are arranged in parallel up and down and their centers are aligned;

[0012] A roller group, comprising at least two roller groups, wherein the roller group comprises an upper roller and a lower roller, wherein the upper roller is mounted on the lower surface of the upper seat plate, and the lower roller is mounted on the upper surface of the lower seat plate;

[0013] A first rack and a second rack, the first rack and the second rack are arranged in parallel between the two seat plates, the first rack and the second rack are respectively sandwiched by at least one group of roller groups, the first rack and the second rack are respectively arranged between the corresponding upper roller and lower roller, the ends of the first rack and the second rack are provided with mass blocks, the teeth of the first rack and the second rack are arranged oppositely, the plate surfaces of the first rack and the second rack are parallel to the plate surface of the seat plate, and the first rack and the second rack are arranged in an anti-symmetrical manner;

[0014] A gear, the gear being arranged between the first rack and the second rack, the gear being meshed with the first rack and the second rack respectively, wherein when the gear rotates, the gear drives the two racks to move linearly relative to each other or to move linearly opposite to each other simultaneously;

[0015] A stepper motor, wherein the output end of the stepper motor is connected to a gear, and the stepper motor drives the gear to rotate to adjust the distance between the two mass blocks and the nearest roller group in the same column.

[0016] Optionally, the number of the roller groups is 6;

[0017] Each three groups of rollers are evenly arranged in a row along the length direction of the seat plate. When the direction from one side to the other side along the length direction of the seat plate is designated as the first direction, the opposite direction of the first direction is the second direction.

[0018] When the first rack and the second rack are in the initial state,

[0019] One end of the first rack is mounted with a roller group in the same row on the second gear group in the first direction, a mass block is arranged at the other end of the first rack, and the first gear group in the first direction clamps the middle part of the first rack;

[0020] One end of the second rack is mounted with a roller group in the same row on the second gear group in the second direction, and a mass block is arranged at the other end of the second rack. The first gear group in the second direction clamps the middle part of the second rack.

[0021] Optionally, the output end of the stepper motor passes through the upper seat plate and is connected to the center of the gear;

[0022] The stepper motor is mounted on the top of the upper seat plate.

[0023] Optionally, the upper roller and the lower roller have the same structure;

[0024] The upper roller comprises a wheel and a wheel seat, wherein the wheel is mounted in the wheel seat by bolts and nuts;

[0025] When the gear rotates, and the first rack and the second rack move linearly at the same time, the upper roller and the lower roller in the roller group respectively adapted to the first rack and the second rack roll at the same time to guide the first rack and the second rack to move.

[0026] Optionally, the first rack and the second rack are spur racks, and the first rack and the second rack have the same structure.

[0027] Optionally, the output end of the stepper motor and the gear are in interference fit.

[0028] A frequency modulation method for an antisymmetric rack beam type adaptive vibration absorbing device, applied to the above antisymmetric rack beam type adaptive vibration absorbing device, comprising:

[0029] Install the lower seat plate on the vibrating equipment;

[0030] Calculating the effective length in the antisymmetric rack beam type adaptive vibration absorbing device according to the vibration frequency of the vibration device, wherein the effective length is the distance from the mass block to the contact point between the first roller group in the same row and the corresponding first rack or second rack;

[0031] The stepper motor is controlled to adjust the first rack and the second rack to move synchronously according to the effective length in the antisymmetric rack beam type adaptive vibration absorption device, until the distance from the mass block to the contact point between the first roller group in the same column and the first rack or the second rack is the effective length, and the stepper motor stops working.

[0032] Optionally, the formula for calculating the effective length in the antisymmetric rack beam type adaptive vibration absorbing device according to the vibration frequency of the vibration device is formula (1):

[0033]

[0034] f is the natural frequency of the antisymmetric rack beam type adaptive vibration absorbing device, and the value of the natural frequency of the antisymmetric rack beam type adaptive vibration absorbing device is equal to the vibration frequency of the vibration device;

[0035] E is the elastic modulus of the first rack and the second rack;

[0036] b is the width of the rectangular cross section of the first rack and the rack beam of the first rack;

[0037] h is the height of the first rack and the rectangular cross section of the rack of the first rack;

[0038] m is the equivalent mass;

[0039] L is the effective length.

[0040] Optionally, the method further includes an STM32 single chip microcomputer, and the STM32 single chip microcomputer controls the stepper motor to drive the gear to rotate according to the effective length in the antisymmetric rack beam type adaptive vibration absorption device.

[0041] Optionally, the method further comprises a vibration sensor, wherein the vibration sensor is used to detect the vibration frequency of the vibration device, and the vibration sensor transmits a detection signal to the STM32 single chip microcomputer, and the STM32 single chip microcomputer obtains the effective length in the antisymmetric rack beam type adaptive vibration absorption device according to formula (1).

[0042] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0043] 1. Excellent vibration reduction effect: The gear meshing with the rack beam is driven by a stepper motor to change the effective length of the rack beam, thereby changing the natural frequency of the vibration absorbing device. Using a rack beam with low damping characteristics as the elastic element of the vibration absorbing device will greatly improve the vibration absorbing effect of the traditional vibration absorbing device.

[0044] 2. Stable frequency regulation and stable and safe structure: The frequency modulation is precise and stable, which can effectively control the vibration of the structure, reduce the impact of vibration on the structure, and improve the stability and safety of the structure. The structure is simple, adaptable, easy to maintain, and has a high cost performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0046] Figure 1 A schematic diagram of the overall structure provided by the present invention;

[0047] Figure 2 A schematic diagram of the layout structure of a top view of a first rack, a second rack and a gear provided by the present invention;

[0048] Figure 3 A diagram illustrating the effective length provided by the present invention.

[0049] Marking Description:

[0050] 1. seat plate; 2. roller assembly; 21. upper roller; 23. lower roller; 3. first rack; 4. second rack; 5. stepping motor; 6. gear; 7. mass block. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "one" or "the" do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0053] It should be noted that the terms "up", "down", "left", "right", "front", "back", etc. used in the present invention are only used to indicate relative position relationships. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0054] An anti-symmetric rack beam type adaptive vibration absorbing device, comprising: two seat plates 1, a roller group 2, a stepping motor 5, a gear 6, a first rack 3 and a second rack 4;

[0055] The two seat plates 1 are arranged in parallel up and down and their centers are aligned; there are at least two roller groups 2, and the roller group 2 includes an upper roller 21 and a lower roller 22, the upper roller 21 is installed on the lower surface of the upper seat plate 1, and the lower roller 22 is installed on the upper surface of the lower seat plate 1; the first rack 3 and the second rack 4 are arranged in parallel between the two seat plates 1, the first rack 3 and the second rack 4 are respectively sandwiched by at least one group of roller groups 2, the first rack 3 and the second rack 4 are respectively arranged between the corresponding upper roller 21 and the lower roller 22, and the ends of the first rack 3 and the second rack 4 are provided with mass blocks 7, The teeth of the first rack 3 and the second rack 4 are arranged opposite to each other, the plate surfaces of the first rack 3 and the second rack 4 are parallel to the plate surface of the seat plate 1, and the first rack 3 and the second rack 4 are arranged antisymmetrically; the gear 6 is arranged between the first rack 3 and the second rack 4, and the gear 6 is respectively meshed with the first rack 3 and the second rack 4, wherein when the gear 6 rotates, the gear 6 drives the two racks to move linearly relative to each other or move linearly opposite to each other at the same time; the output end of the stepper motor 5 is connected to the gear 6, and the stepper motor 5 drives the gear 6 to rotate to adjust the distance between the two mass blocks 7 and the nearest roller group 2 in the same column.

[0056] The specific structure of the vibration absorbing device is as follows:

[0057] Two seat plates 1 are arranged in parallel up and down, and the shape of the two seat plates 1 is rectangular. The structures of the two seat plates 1 are equal. Multiple holes are arranged on the seat plates 1, and the seat plates 1 can be used to install the device on the vibration equipment. The other two seat plates 1 are aligned up and down in space, and there is space for installing other components between the two seat plates 1. In addition, the two seat plates 1 can be connected by one or more support columns when installed between the two seat plates 1, or the upper seat plate 1 can be installed under the corresponding bracket of the vibration equipment to be installed on the vibration source of the vibration equipment.

[0058] The roller group 2 is installed between the two seat plates 1. One roller group 2 includes an upper roller 21 and a lower roller 22. The upper roller 21 of the roller group 2 is installed on the lower surface of the upper seat plate 1, and the lower roller 22 of the roller group 2 is installed on the upper surface of the lower roller. In one roller group 2, the wheels in the upper roller 21 and the lower roller 22 are arranged relative to each other, and the positions of the two are spatially on the same straight line parallel to the Z axis. There is a certain gap between the upper roller 21 and the lower roller 22. The gap between the upper roller 21 and the lower roller 22 is just enough to clamp the first rack 6 and the second rack 6. When the first rack 6 and the second rack 6 move in a straight line, the rollers of the upper roller 21 and the lower roller 22 passively roll to guide the first rack 6 and the second rack 6 to move.

[0059] In a preferred implementation scheme for the specific arrangement of the roller groups 2, the number of the roller groups 2 is 6; therefore, there are a total of 12 wheels and 12 wheel seats.

[0060] The structures of the upper roller and the lower roller are prior art, and the specific details are not described in detail.

[0061] The six roller groups 2 are divided into two rows, each row has three roller groups 2 , and the roller groups 2 in each row are arranged along the length direction of the seat plate 1 .

[0062] Each three groups of roller groups 2 are evenly arranged in a row along the length direction of the seat plate 1. When the direction from one side to the other side along the length direction of the seat plate 1 is designated as the first direction, the opposite direction of the first direction is the second direction.

[0063] For example, the first direction is the left side of the seat plate 1 in the length direction, and the second direction is the right side of the seat plate 1 in the length direction (left and right here are just two relative sides, which is only one implementation method, and the first direction can also be the right side and the second direction can be the left side).

[0064] When the first rack 6 is installed in a column of roller groups 2, the end of the first rack 6 without the mass block 7 is inserted into the column of roller groups 2 from left to right, wherein the end of the first rack 6 without the mass block 7 at least passes through the first roller group 2 on the left, and preferably passes through the first roller group 2 and the second roller group 2 in the column in sequence.

[0065] When the second rack 6 is installed in a row of roller groups 2, the end of the second rack 6 without the mass block 7 is inserted into the roller groups 2 in the same row from the right to the left, wherein the end of the second rack 6 without the mass block 7 at least passes through the first roller group 2 on the right, and preferably passes through the first roller group 2 and the second roller group 2 in the same row in sequence.

[0066] When the first rack 3 and the second rack 4 are in the initial state,

[0067] One end of the first rack 3 is mounted with a roller group 2 in the same row on the second gear group 6 in the first direction, and a mass block 7 is arranged at the other end of the first rack 3, and the first gear group 6 in the first direction clamps the middle part of the first rack 3;

[0068] One end of the second rack 4 is mounted on the second gear 6 group in the second direction with the roller group 2 in the same row, and the other end of the second rack 4 is provided with a mass block 7, and the first gear 6 group in the second direction clamps the middle part of the second rack 4.

[0069] In a specific implementation manner, the output end of the stepper motor 5 passes through the upper base plate 1 and is connected to the center of the gear 6;

[0070] The stepper motor 5 is mounted on the top of the upper seat plate 1 .

[0071] The upper roller 21 and the lower roller 22 have the same structure;

[0072] The upper roller 21 comprises a wheel and a wheel seat, and the wheel is mounted in the wheel seat by bolts and nuts;

[0073] When the gear 6 rotates, and the first rack 3 and the second rack 4 move linearly at the same time, the upper roller 21 and the lower roller 22 in the roller group 2 respectively adapted to the first rack 3 and the second rack 4 roll and guide the first rack 3 and the second rack to move at the same time.

[0074] In a specific embodiment, the first rack 3 and the second rack 4 are spur racks, and the first rack 3 and the second rack 4 have the same structure. The output end of the stepping motor 5 and the gear 6 are interference fit.

[0075] A frequency modulation method for an antisymmetric rack beam type adaptive vibration absorbing device, applied to the above antisymmetric rack beam type adaptive vibration absorbing device, comprising:

[0076] The lower seat plate is installed on the vibration source of the vibration device; the vibration sensor is installed on the vibration source of the vibration device, the vibration sensor is used to detect the vibration frequency of the vibration device, the vibration sensor transmits the detection signal to the STM32 single chip microcomputer, and the STM32 single chip microcomputer obtains the effective length in the antisymmetric rack beam type adaptive vibration absorption device according to formula (1).

[0077] Calculating the effective length in the antisymmetric rack beam type adaptive vibration absorbing device according to the vibration frequency of the vibration device, wherein the effective length is the distance from the mass block to the contact point between the first roller group in the same row and the first rack or the second rack;

[0078] The relationship between the natural frequency f of the antisymmetric rack beam type adaptive vibration absorption device and the effective length of the rack is described as follows:

[0079] The basic frequency formula is:

[0080]

[0081] Where k is the equivalent stiffness and m is the equivalent mass.

[0082] The cantilever beam (the first rack and the second rack) used has a rectangular cross section, ignoring the influence of the tooth shape. The equivalent stiffness of the cantilever beam is:

[0083]

[0084] Wherein E is the elastic modulus of the material of the first rack and the second rack, I is the section moment of inertia of the first rack and the second rack, and L is the effective length.

[0085]

[0086] Wherein b is the width of the rectangular cross-section of the first rack and the rack beam of the first rack, and h is the height of the rectangular cross-section of the first rack and the rack beam of the first rack.

[0087] The formula for calculating the effective length in the antisymmetric rack beam type adaptive vibration absorbing device according to the vibration frequency of the vibration device is formula (1):

[0088]

[0089] f is the natural frequency of the antisymmetric rack beam type adaptive vibration absorbing device, and the value of the natural frequency of the antisymmetric rack beam type adaptive vibration absorbing device is equal to the vibration frequency of the vibration device;

[0090] E is the elastic modulus of the first rack and the second rack;

[0091] b is the width of the rectangular cross section of the first rack and the rack beam of the first rack;

[0092] h is the height of the first rack and the rectangular cross section of the rack of the first rack;

[0093] m is the equivalent mass;

[0094] L is the effective length.

[0095] The method further includes an STM32 single chip microcomputer, and the STM32 single chip microcomputer controls the stepper motor to drive the gear to rotate according to the effective length in the antisymmetric rack beam type adaptive vibration absorption device.

[0096] It can be seen that when the effective length L of the cantilever beam driven by the motor control gear decreases, the frequency of the cantilever beam increases.

[0097] This vibration absorption device uses a stepper motor with a transmission system, which can quickly and accurately control the effective length of the rack beam to realize the frequency modulation function; the frequency signal collected by the sensor is input into the STM32 single-chip microcomputer, and then the single-chip microcomputer outputs the corresponding signal to the stepper motor, thereby realizing adaptive frequency modulation vibration absorption. The antisymmetric rack beam type intelligent adaptive vibration absorption device of the present invention has accurate and stable frequency modulation, can effectively control the vibration of the structure, reduce the impact of vibration on the structure, improve the stability and safety of the structure, has a simple structure, strong adaptability, is easy to maintain, and has a high cost performance.

[0098] The following points need to be explained:

[0099] (1) The drawings of the embodiments of the present invention only relate to the structures related to the embodiments of the present invention, and other structures may refer to the general design.

[0100] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present invention, the thickness of the layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or there may be intermediate elements.

[0101] (3) In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to obtain new embodiments.

[0102] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. An antisymmetric rack beam type adaptive vibration absorbing device, characterized in that: include: Two seat plates, the two seat plates are arranged in parallel up and down and their centers are aligned; A roller group, comprising at least two roller groups, wherein the roller group comprises an upper roller and a lower roller, wherein the upper roller is mounted on the lower surface of the upper seat plate, and the lower roller is mounted on the upper surface of the lower seat plate; A first rack and a second rack, the first rack and the second rack are arranged in parallel between the two seat plates, the first rack and the second rack are respectively sandwiched by at least one group of roller groups, the first rack and the second rack are respectively arranged between the corresponding upper roller and lower roller, the ends of the first rack and the second rack are provided with mass blocks, the teeth of the first rack and the second rack are arranged oppositely, the plate surfaces of the first rack and the second rack are parallel to the plate surface of the seat plate, and the first rack and the second rack are arranged in an anti-symmetrical manner; A gear, the gear being arranged between the first rack and the second rack, the gear being meshed with the first rack and the second rack respectively, wherein when the gear rotates, the gear drives the two racks to move linearly relative to each other or to move linearly opposite to each other simultaneously; A stepper motor, wherein the output end of the stepper motor is connected to a gear, and the stepper motor drives the gear to rotate to adjust the distance between the two mass blocks and the nearest roller group in the same column.

2. The antisymmetric rack beam type adaptive vibration absorbing device according to claim 1, characterized in that: The number of the roller groups is 6; Each three groups of rollers are evenly arranged in a row along the length direction of the seat plate. When the direction from one side to the other side along the length direction of the seat plate is designated as the first direction, the opposite direction of the first direction is the second direction. When the first rack and the second rack are in the initial state, One end of the first rack is mounted with a roller group in the same row on the second gear group in the first direction, a mass block is arranged at the other end of the first rack, and the first gear group in the first direction clamps the middle part of the first rack; One end of the second rack is mounted with a roller group in the same row on the second gear group in the second direction, and a mass block is arranged at the other end of the second rack. The first gear group in the second direction clamps the middle part of the second rack.

3. The antisymmetric rack beam type adaptive vibration absorbing device according to claim 2, characterized in that: The output end of the stepper motor passes through the upper base plate and is connected to the center of the gear; The stepper motor is mounted on the top of the upper seat plate.

4. The antisymmetric rack beam type adaptive vibration absorbing device according to claim 1, characterized in that: The upper roller and the lower roller have the same structure; The upper roller comprises a wheel and a wheel seat, wherein the wheel is mounted in the wheel seat by bolts and nuts; When the gear rotates, and the first rack and the second rack move linearly at the same time, the upper roller and the lower roller in the roller group respectively adapted to the first rack and the second rack roll at the same time to guide the first rack and the second rack to move.

5. The anti-symmetric rack beam type adaptive vibration absorbing device according to claim 1, characterized in that: The first rack and the second rack are spur racks, and the first rack and the second rack have the same structure.

6. The anti-symmetric rack beam type adaptive vibration absorbing device according to claim 1, characterized in that: The output end of the stepper motor and the gear are in interference fit.

7. A frequency modulation method for an antisymmetric rack beam type adaptive vibration absorbing device, characterized in that: The antisymmetric rack beam type adaptive vibration absorbing device applied to any one of claims 1 to 6 comprises: Install the lower seat plate on the vibrating equipment; Calculating the effective length in the antisymmetric rack beam type adaptive vibration absorbing device according to the vibration frequency of the vibration device, wherein the effective length is the distance from the mass block to the contact point between the first roller group in the same row and the corresponding first rack or second rack; The stepper motor is controlled to adjust the first rack and the second rack to move synchronously according to the effective length in the antisymmetric rack beam type adaptive vibration absorption device, until the distance from the mass block to the contact point between the first roller group in the same column and the first rack or the second rack is the effective length, and the stepper motor stops working.

8. The frequency modulation method of the antisymmetric rack beam type adaptive vibration absorbing device according to claim 7, characterized in that: The formula for calculating the effective length in the antisymmetric rack beam type adaptive vibration absorbing device according to the vibration frequency of the vibration device is formula (1): f is the natural frequency of the antisymmetric rack beam type adaptive vibration absorbing device, and the value of the natural frequency of the antisymmetric rack beam type adaptive vibration absorbing device is equal to the vibration frequency of the vibration device; E is the elastic modulus of the first rack and the second rack; b is the width of the rectangular cross section of the first rack and the rack beam of the first rack; h is the height of the first rack and the rectangular cross section of the rack of the first rack; m is the equivalent mass; L is the effective length.

9. The frequency modulation method of the antisymmetric rack beam type adaptive vibration absorbing device according to claim 8, characterized in that: It also includes an STM32 single chip microcomputer, which controls the stepper motor to drive the gear to rotate according to the effective length in the antisymmetric rack beam type adaptive vibration absorption device.

10. The frequency modulation method of the anti-symmetric rack beam type adaptive vibration absorbing device according to claim 9, characterized in that: It also includes a vibration sensor, which is used to detect the vibration frequency of the vibration device. The vibration sensor transmits a detection signal to the STM32 single-chip microcomputer, and the STM32 single-chip microcomputer obtains the effective length in the antisymmetric rack beam type adaptive vibration absorption device according to formula (1).

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