Series-parallel nonlinear vibration absorber cell

Abstract

The application discloses a series-parallel nonlinear vibration absorber cell which is composed of a mass block, a steel wire rope, a linear bearing, a linear guide rod, a guide rod support, a magnet fixing block, a circular ring magnet, a steel wire rope fixing frame, a linear guide rod fixing frame, a linear sliding block, a linear guide rail and an outer frame. The series-parallel nonlinear vibration absorber cell is realized by different connection modes. The large vibration of the nonlinear vibration absorber cell is limited by the magnetic force between the circular ring magnets, and the reliability is improved. By adjusting the number of the series-parallel nonlinear vibration absorber cells, the versatility of the vibration suppression of different main systems is improved. The device has simple structure, is easy to realize and is suitable for wide application.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of passive vibration control, in particular to a series-parallel nonlinear vibration absorber cell. BACKGROUND

[0002] Vibration is ubiquitous in engineering practice. In many fields, vibration is harmful. For example, vibration can cause abnormal operation of engineering machinery, thereby causing failure; wind-induced vibration can cause collapse of high-rise buildings and bridges; vibration of an airplane wing caused by airflow can affect flight stability; and micro-vibration is a major cause of poor satellite imaging quality. Therefore, harmful vibration of a structure needs to be effectively suppressed.

[0003] Vibration absorption is an effective method for suppressing vibration. A common linear vibration absorber only works on a single frequency, and the vibration suppression frequency band is narrow. In order to overcome the above difficulties, the concept of nonlinear vibration absorption is proposed. When the nonlinear restoring force of a nonlinear vibration absorber is greater than the linear restoring force, the nonlinear vibration absorber has the characteristics of wide-frequency vibration reduction, and can adaptively control resonance in a wide frequency band. However, the weight of the vibration absorber often needs to be proportional to the weight of the main structure to a certain extent, so as to have good vibration reduction efficiency. Therefore, for vibration control of large engineering structures, the weight of the vibration absorber will be very large. The nonlinear vibration absorber for efficient vibration reduction often vibrates more than the main structure, and when a single nonlinear vibration absorber is working, once the vibration absorber device is damaged, the vibration control of the structure is invalid. Therefore, the reliability of a single nonlinear vibration absorber is very low. The weight requirements of different main systems for nonlinear vibration absorbers are different. Once the main system changes greatly, the nonlinear vibration absorber needs to be redesigned. Therefore, the versatility of a single nonlinear vibration absorber is also very low. Large additional weight, low reliability and versatility greatly limit the use of nonlinear vibration absorbers in solving practical engineering problems. SUMMARY

[0004] In view of the defects of the prior art, the present application aims to provide a series-parallel nonlinear vibration absorber cell, which limits the maximum amplitude of the nonlinear vibration absorber by the force between the magnets, and improves the reliability and versatility of the nonlinear vibration absorber vibration control by connecting a large number of light nonlinear vibration absorbers in series or parallel, which have wide-frequency control.

[0005] To achieve the above object, the technical scheme adopted by the present application is as follows:

[0006] A series-parallel nonlinear vibration absorber cell is composed of a mass block, a steel wire rope, a linear bearing, a linear guide rod, a guide rod support, a magnet fixing block, a circular ring magnet, a steel wire rope fixing frame, a linear guide rod fixing frame, a linear slider, a linear guide rail and an outer frame. The mass block is sleeved on the linear guide rod through the linear bearing, and can only move along the linear guide rod. A through groove is formed in the mass block, and the steel wire rope passes through the through groove and is fixed on the steel wire rope fixing frame through fixing blocks and bolts at both ends. The bolts pass through threaded holes above the mass block to fix and connect the midpoint of the steel wire rope and the mass block; the mass block moves along the linear guide rod, and the steel wire rope generates a nonlinear restoring force in the movement direction of the mass block. The linear guide rod is fixed in the guide rod support, and the guide rod support is connected with the linear guide rod fixing frame through bolts. The circular ring magnet is fixed on one side of the magnet fixing block, and the magnet fixing block is fixed on the linear guide rod through bolts; the circular ring magnet is fixed on the linear bearing and moves with the mass block; the distance between the circular ring magnets can be changed by moving the magnet fixing block, so that the magnetic force between the magnets is changed. Threaded holes are formed in the middle of the steel wire rope fixing frame and the linear guide rod fixing frame, and the steel wire rope fixing frame and the linear guide rod fixing frame are connected through bolts. The steel wire rope fixing frame is connected with the linear slider through bolts, and the linear slider can move on the linear guide rail or be fixed on the linear guide rail through bolts. The linear guide rail is fixedly connected with the outer frame through bolts.

[0007] The polarities of the circular ring magnets on the same side of the mass block are opposite.

[0008] The position of the magnet fixing block is moved to change the magnetic force between the circular ring magnets, so as to limit the movement range of the mass block of the nonlinear vibration absorber.

[0009] The series-parallel nonlinear vibration absorber cell can be connected through bolts, so that the number of cells can be increased or decreased.

[0010] The bolts are tightened to fix the linear slider and the linear guide rail, the outer frames of single nonlinear vibration absorber cells are connected through bolts, and a parallel nonlinear vibration absorber cell is formed.

[0011] The bolts are loosened to make the linear slider move on the linear guide rail, the outer frames of single nonlinear vibration absorber cells are connected through bolts, and the steel wire rope fixing frame and the linear guide rod fixing frame are connected with the mass block and the steel wire rope of the next layer through series connection bolts, so as to form a series nonlinear vibration absorber cell.

[0012] Compared with the prior art, the beneficial effects of the present application are:

[0013] 1. The maximum amplitude of the nonlinear vibration absorber can be limited by the circular ring magnet, and the reliability of the device is improved.

[0014] 2. By connecting a large number of lightweight nonlinear vibration absorber cells in series and parallel, lightweight and cellular structure is realized, and the reliability and versatility in application are improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Figure 1 is a schematic diagram of a nonlinear vibration absorber cell structure.

[0016] Figure 2 Figure 2 is a schematic diagram of a parallel nonlinear vibration absorber cell structure.

[0017] Figure 3 Figure 3 is a schematic diagram of a series nonlinear vibration absorber cell structure.

[0018] Figure 4 Figure 4 is a schematic diagram of a single degree of freedom system vibration suppression according to an embodiment of the present application.

[0019] Figure 5 Figure 5 is a relationship between the number of parallel nonlinear energy cells and the vibration suppression efficiency.

[0020] Wherein: 1, mass block, 2, second bolt, 3, steel wire rope, 4, fixed block, 5, first bolt, 6, linear bearing, 7, linear guide rod, 8, guide rod support, 9, third bolt, 10, magnet fixed block, 11, fourth bolt, 12, first ring magnet, 13, second ring magnet, 14, steel wire rope fixed frame, 15, linear guide rod fixed frame, 16, fifth bolt, 17, sixth bolt, 18, linear slider, 19, linear guide rail, 20, seventh bolt, 21, eighth bolt, 22, outer frame, 23, ninth bolt, 24, series bolt. 25, single degree of freedom vibrator. DETAILED DESCRIPTION

[0021] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0022] As Figure 1As shown in the figure, a series-parallel nonlinear vibration absorber cell, the mass 1 is sleeved on the linear guide rod 7 through the linear bearing 6, the mass 1 can only move along the linear guide rod 7; The mass 1 is provided with a through slot, the steel wire rope 3 passes through the through slot, and the two ends are fixed on the steel wire rope fixing frame 14 through the fixed block 4 and the first bolt 5; The second bolt 2 passes through the threaded hole above the mass 1, and the midpoint of the steel wire rope 3 and the mass 1 are fixedly connected; When the mass 1 moves along the linear guide rod 7, the steel wire rope 3 generates a pure nonlinear restoring force in the movement direction of the mass 1; The linear guide rod 7 is fixed in the guide rod support 8 at both ends, and the guide rod support 8 is connected with the linear guide rod fixing frame 15 through the third bolt 9; The first annular magnet 12 is fixed on one side of the magnet fixing block 10, the fourth bolt 11 fixes the magnet fixing block 10 on the linear guide rod 7, and the second annular magnet 13 is fixed on the linear bearing 6 and moves with the mass 1; Threaded holes are formed in the middle of the steel wire rope fixing frame 14 and the linear guide rod fixing frame 15, and they are connected through the fifth bolt 16; The steel wire rope fixing frame 14 is connected with the linear sliding block 18 through the sixth bolt 17, and the linear sliding block 18 can move on the linear guide rail 19, or the linear sliding block 18 is fixed on the linear guide rail 19 through the eighth bolt 21, and the linear guide rail 19 is fixed with the outer frame 22 through the seventh bolt 20.

[0023] The polarity of the annular magnet on the same side of the mass 1 is opposite.

[0024] The position of the magnet fixing block 10 is moved, the distance between the two annular magnets is changed, and then the acting force between the magnets is changed, so that the movement range of the mass 1 is controlled.

[0025] The series-parallel nonlinear vibration absorber cell is connected through the ninth bolt 23, so that the number of nonlinear vibration absorber cells is increased or decreased.

[0026] As shown in the figure, Figure 2 The eighth bolt 21 is tightened, so that the linear sliding block 18 is fixed with the linear guide rail 19, the outer frames 22 of individual nonlinear vibration absorber cells are connected through the ninth bolt 23, and the steel wire rope fixing frame 14 and the linear guide rod fixing frame 15 are connected only through the fifth bolt 16, the mass 1 of each nonlinear vibration absorber cell moves independently, thereby forming a parallel vibration absorber cell.

[0027] As shown in the figure, Figure 3 The eighth bolt 21 is loosened, so that the linear sliding block 18 moves on the linear guide rail 19, the outer frames 22 of individual nonlinear vibration absorber cells are connected through the ninth bolt 23, and the steel wire rope fixing frame 14 and the linear guide rod fixing frame 15 are connected with the mass 1 and the steel wire rope 3 of the next layer cell through the series bolt 24, there is a relative displacement between the mass 1 of the upper layer and the lower layer cell, thereby forming a series nonlinear vibration absorber cell.

[0028] As Figure 4 shown, taking single degree of freedom as an example, the parallel nonlinear vibration absorber cell of the application is fixed at the upper end of the single degree of freedom vibrator 25, and the bottom is subjected to displacement excitation, driving the parallel nonlinear vibration absorber cell to vibrate together.

[0029] As Figure 5 shown, from the relationship between the number of parallel nonlinear vibration absorber cells and the vibration reduction efficiency, it can be seen that as the number of cells increases, the vibration reduction efficiency of the nonlinear vibration absorber also gradually increases to stability. It can be seen that for different mass systems, only the number of nonlinear vibration absorber cells needs to be increased or decreased, and excellent vibration reduction performance can be obtained without the need to redesign a new nonlinear vibration absorber to match different main systems. In addition, when a single nonlinear vibration absorber is working, once the vibration absorber device is damaged, the vibration control of the structure is invalid, and for the application, the destruction of a nonlinear vibration absorber cell will not have too much influence on the vibration absorption efficiency. Therefore, the series-parallel nonlinear vibration absorber cell proposed in the application can greatly improve the reliability and universality of the nonlinear vibration absorber in engineering practice.

[0030] The series-parallel nonlinear vibration absorber cell of the application is used as follows: when external excitation acts on the main system, the main system vibrates. When the main system is attached to the series-parallel nonlinear vibration absorber cell of the application, the vibration energy of the main system is transmitted to the series-parallel nonlinear vibration absorber cell in a single direction, causing the mass block of the nonlinear vibration absorber cell to vibrate greatly and dissipate the energy of the main system. Due to the presence of the circular ring magnet, the mass block of the nonlinear vibration absorber cell is limited within a certain range of motion. According to the weight of different main systems and single nonlinear vibration absorber cells, the number of parallel or series nonlinear vibration absorber cells can be easily increased or decreased to obtain the best vibration reduction efficiency. When the controlled object changes, only the number of nonlinear vibration absorber cells needs to be appropriately increased or decreased, without the need to redesign the nonlinear vibration absorber. In addition, when the structure of a single nonlinear vibration absorber cell is damaged, other series-parallel nonlinear vibration absorber cells can still work normally.

[0031] The above describes the embodiments of the application in conjunction with the drawings, but the application is not limited to the above embodiments, and various changes can be made according to the purpose of the application. Any change, modification, replacement, combination or simplification made according to the spirit and principles of the technical solution of the application shall be an equivalent replacement, as long as it meets the purpose of the application and does not deviate from the technical principles and inventive concept of the application.

Claims

1. A series-parallel nonlinear vibration absorber cell, characterized in that, The mass block (1) is mounted on the linear guide rod (7) via a linear bearing (6), and the mass block (1) can only move along the linear guide rod (7); a through groove is opened in the mass block (1), through which the wire rope (3) passes, and its two ends are fixed to the wire rope fixing frame (14) by fixing blocks (4) and first bolts (5); a second bolt (2) passes through the threaded hole above the mass block (1) to fix the midpoint of the wire rope (3) and the mass block (1); when the mass block (1) moves along the linear guide rod (7), the wire rope (3) generates a purely nonlinear restoring force in the direction of motion of the mass block (1); the two ends of the linear guide rod (7) are fixed in the guide rod bracket (8), and the guide rod bracket (8) is connected to the linear guide rod fixing frame (15) by a third bolt (9); the first circular magnet (12) is fixed to the magnet fixing block (10). On one side of the magnetic block (10), the fourth bolt (11) fixes the magnet fixing block (10) to the linear guide rod (7), and the second ring magnet (13) is fixed to the linear bearing (6) and moves together with the mass block (1). The wire rope fixing frame (14) and the linear guide rod fixing frame (15) are both threaded holes and connected by the fifth bolt (16). The wire rope fixing frame (14) is connected to the linear slider (18) by the sixth bolt (17). The linear slider (18) is set on the linear guide rail (19). By loosening the eighth bolt (21), the linear slider (18) can slide on the linear guide rail (19). By tightening the eighth bolt (21), the linear slider (18) is fixed on the linear guide rail (19). The linear guide rail (19) is installed on the outer frame (22) by the seventh bolt (20).

2. The series-parallel nonlinear vibration absorber cell according to claim 1, characterized in that, The circular magnets on the same side of the mass block (1) have opposite polarities.

3. The series-parallel nonlinear vibration absorber cell according to claim 1, characterized in that, By moving the position of the magnet fixing block (10), the distance between the two circular magnets is changed, thereby changing the force between the magnets and thus controlling the range of motion of the mass block (1).

4. The series-parallel nonlinear vibration absorber cell according to claim 1, characterized in that, The series-parallel nonlinear vibration absorber cells are connected by the ninth bolt (23), thereby increasing or decreasing the number of nonlinear vibration absorber cells.

5. The series-parallel nonlinear vibration absorber cell according to claim 1, characterized in that, Tighten the eighth bolt (21) to fix the linear slider (18) to the linear guide rail (19), connect the outer frame (22) of the individual nonlinear vibration absorber cell through the ninth bolt (23), and connect the wire rope fixing frame (14) and the linear guide rod fixing frame (15) only through the fifth bolt (16) to form a parallel vibration absorber cell.

6. The series-parallel nonlinear vibration absorber cell according to claim 1, characterized in that, Loosen the eighth bolt (21) to allow the linear slider (18) to move on the linear guide rail (19). Connect the outer frame (22) of the individual nonlinear vibration absorber cell through the ninth bolt (23). Connect the wire rope fixing frame (14) and the linear guide rod fixing frame (15) to the mass block (1) and wire rope (3) of the next cell through the series bolt (24), thereby forming a series nonlinear vibration absorber cell.

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