A multi-stage variable-damping broadband vibration suppression device

Abstract

The application discloses a multistage variable-damping broadband vibration suppression device, and belongs to the technical field of satellite platform vibration control.The device comprises an end cover, a screw, a cylinder cover, a cylinder body, a piston rod, an upper spring, a lower spring and a plurality of damping components.The cylinder cover and the cylinder body are fixed by the screw, and form a closed cavity which is filled with magnetorheological fluid.The piston rod sequentially penetrates through the end cover, the cylinder cover, the plurality of damping components and the bottom of the cylinder body.The second damping component is fixedly connected with the piston rod, the first damping component is connected with the second damping component through the upper spring, and the second damping component is connected with the third damping component through the lower spring.The device has the characteristics of compact structure and integrated vibration isolation and vibration absorption, and is suitable for occasions requiring separate vibration isolation or vibration absorption, and occasions requiring simultaneous vibration isolation or vibration absorption.

Description

Technical Field

[0001] This invention relates to a vibration suppression device, specifically a multi-stage variable damping broadband vibration suppression device, which belongs to the field of satellite platform vibration control technology. Background Technology

[0002] Vibration of satellite platforms can lead to structural fatigue damage and affect the accuracy of instruments and equipment. Vibration isolation and vibration absorption are both commonly used vibration suppression methods. Vibration isolation reduces vibration transmission by isolating the vibration source and load, while vibration absorption reduces the intensity of vibration by absorbing the vibration energy of the structure. Usually, vibration isolation or vibration absorption is selected alone depending on the specific vibration suppression requirements. However, in limited situations, it is necessary to perform both vibration isolation and vibration absorption simultaneously, using vibration isolation to isolate high-frequency vibrations and using vibration absorption to absorb vibrations at certain frequencies.

[0003] Existing vibration damping devices typically have non-adjustable damping, resulting in a narrow absorption bandwidth and poor vibration damping effect. Furthermore, vibration damping devices often separate vibration isolation and absorption functions in their design. For example, publication number CN 115182952 A discloses a variable stiffness and variable damping dynamic vibration absorber and method, and publication number CN 114248813 A discloses a variable stiffness and variable damping dynamic vibration absorber and method. These are variable damping dynamic vibration absorbers, but they do not have vibration isolation functionality. Summary of the Invention

[0004] In order to solve the problems that existing vibration suppression devices usually design vibration isolation and vibration absorption functions separately, and that the damping of vibration absorption devices is usually not adjustable, resulting in narrow vibration absorption bandwidth and poor vibration suppression effect, this invention proposes a multi-stage variable damping broadband vibration suppression device.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows:

[0006] The present invention includes an end cap, screws, a cylinder head, a cylinder body 4, and a piston rod. The cylinder head and the cylinder body are fixed by screws, forming a sealed chamber filled with magnetorheological fluid. The multi-stage variable damping broadband vibration suppression device further includes an upper spring, a lower spring, a first vibration damping component, a second vibration damping component, and a third vibration damping component. The lower end of the piston rod passes sequentially through the end cap, the cylinder head, the first vibration damping component, the second vibration damping component, the third vibration damping component, and the bottom of the cylinder body. The second vibration damping component is fixedly connected to the piston rod. The first vibration damping component and the second vibration damping component are connected by the upper spring, and the second vibration damping component and the third vibration damping component are connected by the lower spring.

[0007] Furthermore, the first damping component includes an upper collar and an upper coil, with the inner side of the upper collar in clearance fit with the outer side of the piston rod, and the upper coil wound in the groove of the upper collar.

[0008] Furthermore, the second damping assembly includes a middle collar and a middle coil. The middle collar is fixedly connected to the middle part of the piston rod, and the middle coil is wound in the groove of the middle collar.

[0009] Furthermore, the third vibration damping component includes a lower collar and a lower coil. The inner side of the lower collar is clearance-fitted with the outer side of the piston rod, and the lower coil is wound in the groove of the lower collar.

[0010] Furthermore, the upper and lower springs are ring springs.

[0011] The beneficial effects of this invention are:

[0012] 1. This invention integrates vibration isolation components and vibration absorption components, and features a compact structure and integrated vibration isolation and vibration absorption. It is suitable for occasions that require individual vibration isolation or vibration absorption, as well as occasions that require simultaneous vibration isolation or vibration absorption.

[0013] 2. This invention can adaptively adjust the damping of the vibration isolation component or vibration reduction component. By adjusting the current of the middle coil, the damping force output required for vibration isolation can be controlled, thereby improving the vibration isolation effect. The vibration absorption frequency can be adjusted by changing the mass of the upper and lower collars. The damping magnitude can be controlled by adjusting the current of the upper and lower coils, thereby widening the vibration absorption frequency band.

[0014] 3. The present invention has multiple adjustable damping vibration reduction components, and the damping of each vibration reduction component can be adjusted separately to achieve multi-level adaptive broadband vibration reduction. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 yes Figure 1 A sectional view;

[0017] Figure 3 This is a schematic diagram of the magnetic circuit distribution of the magnetorheological damper in an embodiment of the present invention.

[0018] In the diagram, 1-end cap, 2-screw, 3-cylinder head, 4-cylinder block, 5-upper collar, 6-upper coil, 7-upper spring, 8-middle collar, 9-middle coil, 10-lower spring, 11-lower collar, 12-lower coil, 13-piston rod, 14-magnetic line I, 15-magnetic line II, 16-magnetic line III. Detailed Implementation

[0019] like Figure 1 and Figure 2As shown, the multi-stage variable damping broadband vibration suppression device described in this embodiment includes an end cap 1, a screw 2, a cylinder head 3, a cylinder body 4, an upper collar 5, an upper coil 6, an upper spring 7, a middle collar 8, a middle coil 9, a lower spring 10, a lower collar 11, a lower coil 12, and a piston rod 13.

[0020] End cap 1, cylinder head 3, and cylinder body 4 are fixed by screws 2. Cylinder head 3 and cylinder body 4 form a sealed chamber filled with magnetorheological fluid. Piston rod 13 is clearance-fitted with cylinder head 3 and cylinder body 4 respectively, and slides through a sealing ring. Middle collar ring 8 is fixed to piston rod 13, and middle coil 9 is wound in the groove of middle collar ring 8. Upper collar ring 5 is connected to middle collar ring 8 by upper spring 7. The inner side of upper collar ring 5 is clearance-fitted with the outer side of piston rod 13, and upper coil 6 is wound in the groove of upper collar ring 5. Lower collar ring 11 is connected to middle collar ring 8 by lower spring 10. The inner side of lower collar ring 11 is clearance-fitted with the outer side of piston rod 13, and lower coil 12 is wound in the groove of lower collar ring 11.

[0021] Preferably, the upper spring 7 and the lower spring 10 are annular springs.

[0022] like Figure 3 As shown, gaps are left between the outer sides of the upper collar 5, the middle collar 8, and the lower collar 11 and the inner side of the cylinder 4, forming three damping channels; the magnetic field distribution generated by the upper coil 6 after energization is as follows. Figure 3 The magnetic field distribution generated by the magnetic field lines I14 and the coil 9 after being energized is shown in the figure. Figure 3 The magnetic field distribution generated by the magnetic field lines II15 and the lower coil 12 after being energized is as follows: Figure 3 Magnetic field lines Ⅲ16 in the middle.

[0023] The piston rod 13, the middle collar 8, the middle coil 9 and the cylinder 4 form a vibration isolation assembly, which plays the role of isolating vibration. By adjusting the current of the middle coil 9, the output of the damping force required for vibration isolation is controlled, thereby improving the vibration isolation effect.

[0024] The piston rod 13, middle collar 8, upper spring 7, upper collar 5, upper coil 6, lower spring 10, lower collar 11, lower coil 12 and cylinder 4 form a vibration absorption assembly, which absorbs vibration. The vibration absorption frequency can be adjusted by changing the mass of the upper collar 5 and the lower collar 11, and the damping magnitude can be controlled by adjusting the current of the upper coil 6 and the lower coil 12, thus widening the vibration absorption frequency range.

[0025] In this embodiment, the multi-stage variable damping broadband vibration suppression device is installed between the load and the base. During operation, the vibration of the base causes the piston rod 13 to slide relative to the cylinder 4. When the coil is not energized, the multi-stage variable damping broadband vibration suppression device generates a passive damping force; when the coil is energized, the multi-stage variable damping broadband vibration suppression device generates a controllable damping force. The current in the coil is adjusted according to the vibration suppression requirements to achieve vibration isolation or reduction.

[0026] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present invention, based on the technical essence of the present invention and within the spirit and principles of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A multi-stage variable damping broadband vibration suppression device, comprising an end cap (1), screws (2), a cylinder head (3), a cylinder body (4), and a piston rod (13), wherein the cylinder head (3) and the cylinder body (4) are fixed by screws (2), and the cylinder head (3) and the cylinder body (4) form a sealed chamber filled with magnetorheological fluid, characterized in that: The multi-stage variable damping wideband vibration suppression device further includes an upper spring (7), a lower spring (10), a first vibration damping component, a second vibration damping component, and a third vibration damping component. The lower end of the piston rod (13) passes through the end cover (1), the cylinder head (3), the first vibration damping component, the second vibration damping component, the third vibration damping component, and the bottom of the cylinder body (4) in sequence. The second vibration damping component is fixedly connected to the piston rod (13). The first vibration damping component and the second vibration damping component are connected by the upper spring (7), and the second vibration damping component and the third vibration damping component are connected by the lower spring (10). The first vibration damping component includes an upper collar (5) and an upper coil (6). The inner side of the upper collar (5) is in clearance fit with the outer side of the piston rod (13), and the upper coil (6) is wound in the groove of the upper collar (5). The second vibration damping component includes a middle collar (8) and a middle coil (9). The middle collar (8) is fixedly connected to the middle part of the piston rod (13). The middle coil (9) is wound in the groove of the middle collar (8). By adjusting the current of the middle coil (9), the output of the damping force required for vibration isolation can be controlled. The third vibration damping component includes a lower collar (11) and a lower coil (12). The inner side of the lower collar is clearance-fitted with the outer side of the piston rod (13), and the lower coil (12) is wound in the groove of the lower collar (11).

2. The multi-stage variable damping broadband vibration suppression device according to claim 1, characterized in that: The upper spring (7) and the lower spring (10) are ring springs.

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