Variable-rigidity and variable-damping self-adaptive vibration reduction device and method

Abstract

The invention relates to the technical field of ruggedized computers, in particular to a variable-rigidity variable-damping self-adaptive vibration reduction device and method.The variable-rigidity variable-damping self-adaptive vibration reduction device comprises a mounting bottom plate and a rack bottom plate, vibration reducer shells are mounted at the four corners of the mounting bottom plate, and the rack bottom plate is fixed to the upper portions of the vibration reducer shells; a motor unit is arranged on one side of the mounting bottom plate, a management unit is arranged on the rack bottom plate, and acceleration sensors are arranged on the two sides of the rack bottom plate; a shock absorber assembly is arranged in the shock absorber shell, the motor unit comprises a plurality of motors, gears are arranged at the tail ends of rotating shafts of the motors, and the gears and the shock absorber assembly jointly form a space gear mechanism. Compared with the prior art, in the low-frequency stage, the damping assembly can automatically increase damping to reduce the response of a resonance point; in the high-frequency stage, the rigidity of the vibration reduction assembly is gradually increased, so that the whole machine has proper rigidity, and proper self response is ensured; and if the response cannot meet the required value, the damping reduction response is automatically reduced or increased.

Description

Technical Field

[0001] The invention relates to the technical field of reinforced computers, and in particular provides an adaptive vibration reduction device and method with variable stiffness and variable damping. Background Art

[0002] A rack server is a high-performance computer that provides computing or application services to other clients. It is generally composed of a rack (including vibration reduction components, chassis), various functional units, etc. The vibration reduction components directly bear the vibration excitation from the outside, and the response of its output acts as an excitation on the chassis and various functional units. Excessive response will cause the chassis and various functional units to vibrate and fail, which requires that the vibration reduction components should have good vibration reduction performance.

[0003] In the field of reinforced servers, servers are generally subjected to excitation in a wide frequency range, and the vibration environment is very harsh. However, the stiffness and damping of commonly used vibration reduction components are fixed, which leads to the following problems:

[0004] 1) The resonance phenomenon of the vibration reduction component at low frequency vibration is inevitable, which is prone to produce a large vibration response;

[0005] 2) In order to ensure the overall structural rigidity of the server, the rigidity of the vibration reduction component needs to be increased. If so, the vibration resistance of the server at higher frequency vibration will be reduced;

[0006] 3) The fixed stiffness and damping of the vibration reduction component cannot meet the vibration reduction effect required by the server in each frequency band, that is, it is impossible to achieve the optimal vibration reduction performance. Summary of the invention

[0007] The present invention aims at solving the above-mentioned deficiencies of the prior art and provides a highly practical adaptive vibration reduction device with variable stiffness and variable damping.

[0008] A further technical task of the present invention is to provide a reasonably designed, safe and applicable adaptive vibration reduction method with variable stiffness and variable damping.

[0009] The technical solution adopted by the present invention to solve the technical problem is:

[0010] An adaptive vibration reduction device with variable stiffness and variable damping comprises a mounting base plate and a frame base plate, wherein the four corners of the mounting base plate are provided with vibration reduction shells, and the frame base plate is fixed to the upper part of the vibration reduction shell;

[0011] A motor unit is provided on one side of the mounting base plate, a management unit is provided on the frame base plate, and acceleration sensors are provided on both sides;

[0012] A shock absorber assembly is arranged in the shock absorber shell, and the motor unit comprises a plurality of motors. Gears are arranged at the ends of the motor shafts, and together with the shock absorber assembly, they form a spatial gear mechanism.

[0013] Furthermore, the shock absorber assembly includes seven spring dampers, and the seven spring dampers include three groups of double spring dampers and one single spring damper.

[0014] Furthermore, each spring damper includes a magnetorheological damper and a variable stiffness coil spring, wherein the magnetorheological damper is close to the frame bottom plate, and the variable stiffness coil spring is close to the mounting bottom plate.

[0015] Furthermore, the shock absorber housing is fixed to the mounting base plate and the frame base plate by means of screws and nuts.

[0016] The invention discloses an adaptive vibration reduction method with variable stiffness and variable damping. A management unit converts a signal from an acceleration sensor into an electrical signal, controls the operation of a motor, thereby rotating a spatial gear mechanism, and further connecting a spring damper to a shock absorber shell.

[0017] Furthermore, the variable stiffness coil spring changes stiffness by adjusting its own mean diameter and spiral angle, while the magnetorheological damper changes damping by adjusting its own current magnitude. The management unit controls the rotation degree of the motor to change the mean diameter and spiral angle of the variable stiffness coil spring, and controls the current magnitude in the magnetorheological damper.

[0018] Furthermore, during low-frequency vibration, the single spring damper is connected to the shock absorber housing, and at this time, only the single spring damper plays a vibration reduction role; the acceleration sensor monitors the acceleration response value at the shock absorber assembly. When the response average value is greater than the required value G, the management unit increases the current in the magnetorheological damper to increase the damping until the response average value is less than the required value G.

[0019] Furthermore, when the vibration frequency gradually tends to high frequency, first, the motor unit adjusts the rotation degree to change the middle diameter and spiral angle of the variable stiffness coil spring to increase its stiffness; if the increased stiffness still cannot make the stiffness of the whole machine have a suitable stiffness K, the three groups of double spring dampers are turned on in sequence and the stiffness is increased in sequence until the stiffness of the whole machine reaches K;

[0020] During this process, the management unit adjusts the current in the magnetorheological damper so that the average response value is less than the required value G, which is a real-time feedback correction process.

[0021] Furthermore, when the stiffness of the whole machine reaches K, the management unit increases or decreases the current in the magnetorheological damper according to the signal from the acceleration sensor and the frequency ratio, so that the average acceleration response value is less than the required value G and the response average value reaches the minimum value to achieve the optimal effect. This process is still a real-time feedback correction process.

[0022] Compared with the prior art, the adaptive vibration reduction device and method with variable stiffness and variable damping of the present invention has the following outstanding beneficial effects:

[0023] Through the effective control of the management board, the vibration reduction component can automatically increase the damping to reduce the response of the resonance point in the low-frequency stage; in the high-frequency stage, the stiffness of the vibration reduction component gradually increases so that the whole machine has appropriate stiffness and ensures its own moderate response; if the response cannot meet the required value, the damping is automatically reduced or increased to reduce the response. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Attached Figure 1 It is a structural schematic diagram of an adaptive vibration reduction device with variable stiffness and variable damping (I);

[0026] Attached Figure 2 It is a structural schematic diagram of an adaptive vibration reduction device with variable stiffness and variable damping (II);

[0027] Attached Figure 3 The present invention is a structural schematic diagram of a spatial gear mechanism in an adaptive vibration reduction device with variable stiffness and variable damping.

[0028] The symbols in the accompanying drawings represent:

[0029] 1. Mounting base plate, 2. Shock absorber housing, 3. Variable stiffness coil spring, 4. Magnetorheological damper, 5. Motor unit, 6. Management unit, 7. Acceleration sensor, 8. Screws and nuts, 9. Rack base plate, 10. Spatial gear mechanism, 11. Motor. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments 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.

[0031] A best embodiment is given below:

[0032] like Figure 1-3 As shown, an adaptive vibration reduction device with variable stiffness and variable damping in this embodiment includes a mounting base plate 1 and a frame base plate 9. The four corners of the mounting base plate 1 are respectively mounted with vibration damper shells 2, and the frame base plate 9 is fixed on the upper part of the vibration damper shells 2.

[0033] In this embodiment, a motor unit 5 is provided on the right side of the mounting base plate 1, a management unit 6 is provided in the middle of the frame base plate 9, and acceleration sensors 7 are provided on the left and right sides;

[0034] A shock absorber assembly is arranged in the shock absorber housing 2 , and the motor unit 5 includes a plurality of motors 11 . Gears are arranged at the ends of the rotating shafts of the motors 11 , and together with the shock absorber assembly, they form a spatial gear mechanism 10 .

[0035] The shock absorber assembly includes seven spring dampers, which include three sets of double spring dampers and one single spring damper. Figure 2 As shown, the three sets of double spring dampers are a pair, b pair and c pair, and the single spring damper is d.

[0036] Each spring damper includes a magnetorheological damper 4 and a variable stiffness coil spring 3 . The magnetorheological damper 4 is close to the frame bottom plate 9 , and the variable stiffness coil spring 3 is close to the mounting bottom plate 1 .

[0037] The damper housing 2 is fixed to the mounting base plate 1 and the frame base plate 9 by means of screws and nuts.

[0038] Based on the above device, in this embodiment, a variable stiffness and variable damping adaptive vibration reduction method is provided, in which the management unit 6 converts the signal from the acceleration sensor 7 into an electrical signal, controls the operation of the motor 11, thereby rotating the spatial gear mechanism 10, and further connecting the spring damper to the shock absorber housing 2.

[0039] The variable stiffness coil spring 3 changes its stiffness by adjusting its own mean diameter and spiral angle, while the magnetorheological damper 4 changes its damping by adjusting its own current size. The management unit 6 controls the rotation degree of the motor 11 to change the mean diameter and spiral angle of the variable stiffness coil spring 3, and controls the current size in the magnetorheological damper 4.

[0040] During low-frequency vibration, the single spring damper is connected to the shock absorber housing 2, and at this time, only the single spring damper plays a vibration reduction role; the acceleration sensor 7 monitors the acceleration response value at the shock absorber assembly. When the response average value is greater than the required value G, the management unit 6 increases the current in the magnetorheological damper 4 to increase the damping until the response average value is less than the required value G.

[0041] When the vibration frequency gradually tends to high frequency, first, the motor unit 6 adjusts the rotation degree to change the median diameter and spiral angle of the variable stiffness coil spring 3 to increase its stiffness; if the increased stiffness still cannot make the stiffness of the whole machine have a suitable stiffness K, the three groups of double spring dampers are turned on in sequence and the stiffness is increased in sequence until the stiffness of the whole machine reaches K;

[0042] During this process, the management unit 6 adjusts the current in the magnetorheological damper 4 so that the average response value is smaller than the required value G, which is a real-time feedback correction process.

[0043] When the stiffness of the whole machine reaches K, the management unit 6 increases or decreases the current in the magnetorheological damper 4 according to the signal from the acceleration sensor 7 and the frequency ratio, so that the average acceleration response value is less than the required value G and the average response value reaches the minimum value to achieve the optimal effect. This process is still a real-time feedback correction process.

[0044] Through the above design method, the vibration reduction component can adjust the stiffness and damping according to the change of the excitation frequency. In the low-frequency vibration stage, the vibration reduction component initially has a lower stiffness. When the excitation frequency tends to the resonance frequency, the damping is automatically increased to reduce the response to less than the required value; when the excitation frequency tends to high frequency, in order to make the whole machine have appropriate stiffness, the stiffness of the vibration reduction component gradually increases, and it has an appropriate response; when the response cannot meet the required value, the damping is automatically reduced or increased to reduce the response and achieve the optimal vibration reduction effect.

[0045] In short, this vibration reduction component can more intelligently and better meet the stiffness and vibration reduction requirements of the entire machine.

[0046] The above-mentioned specific implementations are only specific cases of the present invention. The patent protection scope of the present invention includes but is not limited to the above-mentioned specific implementations. Any technical solutions that conform to the above-mentioned specific implementations of the present invention and any appropriate changes or substitutions made by ordinary technicians in the relevant technical field shall fall within the patent protection scope of the present invention.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adaptive vibration reduction device with variable stiffness and variable damping, characterized in that: It comprises a mounting base plate and a frame base plate, wherein the four corners of the mounting base plate are provided with a shock absorber shell, and the frame base plate is fixed to the upper part of the shock absorber shell; A motor unit is provided on one side of the mounting base plate, a management unit is provided on the frame base plate, and acceleration sensors are provided on both sides; A shock absorber assembly is arranged in the shock absorber shell, and the motor unit comprises a plurality of motors. Gears are arranged at the ends of the motor shafts, and together with the shock absorber assembly, they form a spatial gear mechanism.

2. The adaptive vibration reduction device with variable stiffness and variable damping according to claim 1, characterized in that: The shock absorber assembly includes seven spring dampers, and the seven spring dampers include three groups of double spring dampers and one single spring damper.

3. The adaptive vibration reduction device with variable stiffness and variable damping according to claim 2, characterized in that: Each spring damper includes a magnetorheological damper and a variable stiffness coil spring, wherein the magnetorheological damper is close to the frame bottom plate, and the variable stiffness coil spring is close to the mounting bottom plate.

4. The adaptive vibration reduction device with variable stiffness and variable damping according to claim 3, characterized in that: The damper housing is fixed to the mounting base plate and the frame base plate by means of screws and nuts.

5. An adaptive vibration reduction method with variable stiffness and variable damping, characterized in that: The management unit converts the signal from the acceleration sensor into an electrical signal, controls the operation of the electric motor, thereby rotating the spatial gear mechanism, and further connecting the spring damper to the shock absorber housing.

6. The adaptive vibration reduction method with variable stiffness and variable damping according to claim 5, characterized in that: The variable stiffness coil spring changes stiffness by adjusting its own mean diameter and spiral angle, while the magnetorheological damper changes damping by adjusting its own current. The management unit controls the rotation degree of the motor to change the mean diameter and spiral angle of the variable stiffness coil spring, and controls the current in the magnetorheological damper.

7. The adaptive vibration reduction method with variable stiffness and variable damping according to claim 6, characterized in that: During low-frequency vibration, the single spring damper is connected to the shock absorber housing, and at this time, only the single spring damper plays a vibration reduction role; the acceleration sensor monitors the acceleration response value at the shock absorber assembly. When the response average value is greater than the required value G, the management unit increases the current in the magnetorheological damper to increase the damping until the response average value is less than the required value G.

8. The adaptive vibration reduction method with variable stiffness and variable damping according to claim 7, characterized in that: When the vibration frequency gradually tends to high frequency, first, the motor unit adjusts the rotation degree to change the median diameter and spiral angle of the variable stiffness spiral spring to increase its stiffness; if the increased stiffness still cannot make the whole machine stiffness have a suitable stiffness K, the three groups of double spring dampers are turned on in sequence to increase the stiffness in sequence until the whole machine stiffness reaches K; During this process, the management unit adjusts the current in the magnetorheological damper so that the average response value is less than the required value G, which is a real-time feedback correction process.

9. The adaptive vibration reduction method with variable stiffness and variable damping according to claim 8, characterized in that: When the stiffness of the whole machine reaches K, the management unit increases or decreases the current in the magnetorheological damper according to the signal from the acceleration sensor and the frequency ratio, so that the average acceleration response value is less than the required value G and the average response value reaches the minimum value to achieve the optimal effect. This process is still a real-time feedback correction process.

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