Multistage variable damping broadband vibration suppression device

Abstract

In order to solve the problems that the vibration isolation function and the vibration absorption function of an existing vibration suppression device are usually designed separately, and the damping of the vibration absorption device is usually non-adjustable, the multi-stage variable damping broadband vibration suppression device comprises an end cover, screws, a cylinder cover, a cylinder body, a piston rod, an upper spring, a lower spring and a plurality of vibration reduction assemblies, and the cylinder cover and the cylinder body are fixed through the screws; a closed cavity is formed by the cylinder cover and the cylinder body, the cavity is filled with magnetorheological fluid, the piston rod sequentially penetrates through the end cover, the cylinder cover, the damping assemblies and the bottom of the cylinder body, the second damping assembly is fixedly connected with the piston rod, and the first damping assembly and the second damping assembly are connected through an upper spring. The second vibration reduction assembly and the third vibration reduction assembly are connected through a lower spring. The vibration isolator has the advantages of being compact in structure and integrating vibration isolation and vibration absorption, and is suitable for occasions needing independent vibration isolation or vibration absorption and occasions needing simultaneous vibration isolation or vibration absorption. The invention belongs to the technical field of satellite platform vibration control.

Description

Technical Field

[0001] The present invention relates to a vibration suppression device, and specifically to a multi-stage variable damping wide-frequency vibration suppression device. The present invention belongs to the technical field of satellite platform vibration control. Background Art

[0002] Vibration of the satellite platform can cause structural fatigue damage and also affect the accuracy of instrument equipment. Vibration isolation and vibration absorption are both commonly used vibration suppression methods. Vibration isolation reduces vibration transmission by isolating the vibration source and the load, while vibration absorption reduces the vibration level by consuming and absorbing the vibration energy of the structure. Usually, vibration isolation or vibration absorption is selected separately according to specific vibration suppression requirements. However, in some limited situations, it is necessary to perform vibration absorption and vibration isolation simultaneously, using the vibration isolation method to isolate high-frequency vibration and the vibration absorption method to absorb the vibration at certain frequency points.

[0003] The damping of existing vibration suppression devices is usually not adjustable, resulting in a narrow vibration absorption frequency band and poor vibration suppression effect of the vibration absorption device. In addition, vibration suppression devices usually design the vibration isolation and vibration absorption functions separately. For example, Publication No. CN 115182952 A discloses a variable stiffness variable damping dynamic vibration absorber and method, and Publication No. CN 114248813 A discloses a variable stiffness variable damping dynamic vibration absorber and method, which are variable damping dynamic vibration absorbers but do not have the function of vibration isolation. Summary of the Invention

[0004] In order to solve the problems that existing vibration suppression devices usually design the vibration isolation and vibration absorption functions separately, and in addition, the damping of the vibration absorption device is usually not adjustable, resulting in a narrow vibration absorption frequency band and poor vibration suppression effect of the suppression device, the present invention further provides a multi-stage variable damping wide-frequency 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. The cylinder head and the cylinder body form a closed chamber, and the chamber is filled with magnetorheological fluid. The multi-stage variable damping wide-frequency 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 sequentially passes 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 an upper spring, and the second vibration damping component and the third vibration damping component are connected by a lower spring.

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

[0008] Further, the second damping component 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] Further, the third damping component includes a lower collar and a lower coil. The inner side of the lower collar is in clearance fit with the outer side of the piston rod, and the lower coil is wound in the groove of the lower collar.

[0010] Further, the upper spring and the lower spring are annular springs.

[0011] The beneficial effects of the present invention are as follows:

[0012] 1. The present invention integrates a vibration isolation component and a vibration absorption component, featuring a compact structure and the integration of vibration isolation and vibration absorption. It is suitable for occasions that require separate vibration isolation or vibration absorption, as well as occasions that require simultaneous vibration isolation or vibration absorption.

[0013] 2. The present invention can adaptively adjust the damping of the vibration isolation component or the damping component. By adjusting the magnitude of the current in the middle coil, the damping force output required for vibration isolation is controlled to enhance the vibration isolation effect; by changing the mass of the upper collar and the lower collar, the action frequency of vibration absorption is adjusted; by adjusting the magnitude of the current in the upper coil and the lower coil, the damping magnitude is controlled to broaden the vibration absorption frequency band range.

[0014] 3. The present invention has multiple damping components with adjustable damping, which can respectively adjust the damping of each damping component to achieve multi-level adaptive broadband damping. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 2 is Figure 1 a cross-sectional view of

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

[0018] In the figure, 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 DESCRIPTION OF THE EMBODIMENTS

[0019] As Figure 1 and Figure 2As shown in the figure, a multi-stage variable damping wide-frequency vibration suppression device according to this embodiment includes an end cover 1, a screw 2, a cylinder head 3, a cylinder block 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] The end cover 1, the cylinder head 3, and the cylinder block 4 are fixed by the screw 2. The cylinder head 3 and the cylinder block 4 form a sealed chamber filled with magnetorheological fluid. The piston rod 13 is in clearance fit with the cylinder head 3 and the cylinder block 4 respectively, and sliding sealing is achieved through a sealing ring. The middle collar 8 is fixed to the piston rod 13, and the middle coil 9 is wound in the groove of the middle collar 8. The upper collar 5 is connected to the middle collar 8 by the upper spring 7. The inner side of the upper collar 5 and the outer side of the piston rod 13 are in clearance fit, and the upper coil 6 is wound in the groove of the upper collar 5. The lower collar 11 is connected to the middle collar 8 by the lower spring 10. The inner side of the lower collar 11 and the outer side of the piston rod 13 are in clearance fit, and the lower coil 12 is wound in the groove of the lower collar 11.

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

[0022] As Figure 3 shown, there are gaps 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 block 4, forming three damping channels. The magnetic field distribution generated after the upper coil 6 is energized is like the magnetic line of force Ⅰ14 in Figure 3 , the magnetic field distribution generated after the middle coil 9 is energized is like the magnetic line of force Ⅱ15 in Figure 3 , and the magnetic field distribution generated after the lower coil 12 is energized is like the magnetic line of force Ⅲ16 in Figure 3 .

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

[0024] The piston rod 13, the middle collar 8, the upper spring 7, the upper collar 5, the upper coil 6, the lower spring 10, the lower collar 11, the lower coil 12, and the cylinder block 4 form a vibration absorption component, which plays a role in absorbing vibration. By changing the masses of the upper collar 5 and the lower collar 11 to adjust the vibration absorption frequency, and by adjusting the current magnitudes of the upper coil 6 and the lower coil 12 to control the damping magnitude, the vibration absorption frequency band range is broadened.

[0025] When this embodiment is in use, the multi-stage variable damping wide-frequency vibration suppression device is installed between the load and the base. During the working process, the vibration of the base drives the piston rod 13 to slide relative to the cylinder block 4. When the coil is not energized, the multi-stage variable damping wide-frequency vibration suppression device generates a passive damping force. When the coil is energized, the multi-stage variable damping wide-frequency vibration suppression device generates a controllable damping force. According to the vibration suppression requirements, the current magnitude in the coil is adjusted to achieve vibration isolation or vibration reduction.

[0026] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art, within the scope of the technical solution of the present invention, can make some changes or modifications to the above-disclosed technical content to obtain equivalent embodiments with equivalent changes. However, as long as it does not depart from the technical solution content of the present invention, and based on the technical essence of the present invention, within the spirit and principle of the present invention, any simple modification, equivalent replacement, and improvement made to the above embodiments still fall within the protection scope of the technical solution of the present invention.

Claims

1. A multi-stage variable damping broadband vibration suppression device, comprising an end cover (1), a screw (2), a cylinder cover (3), a cylinder body (4) and a piston rod (13), wherein the cylinder cover (3) and the cylinder body (4) are fixed by means of the screw (2), the cylinder cover (3) and the cylinder body (4) form a closed chamber, and the chamber is filled with a magnetorheological fluid, and is characterized in that: The multi-stage variable damping broadband vibration suppression device further comprises an upper spring (7), a lower spring (10), a first vibration reduction assembly, a second vibration reduction assembly and a third vibration reduction assembly; the lower end of the piston rod (13) passes through the end cover (1), the cylinder cover (3), the first vibration reduction assembly, the second vibration reduction assembly, the third vibration reduction assembly and the bottom of the cylinder body (4) in sequence; the second vibration reduction assembly is fixedly connected to the piston rod (13); the first vibration reduction assembly and the second vibration reduction assembly are connected via the upper spring (7); and the second vibration reduction assembly and the third vibration reduction assembly are connected via the lower spring (10).

2. A multi-stage variable damping broadband vibration suppression device according to claim 1, characterized in that: The first vibration reduction assembly comprises an upper ring (5) and an upper coil (6); the inner side of the upper ring (5) is clearance-matched with the outer side of the piston rod (13); and the upper coil (6) is wound in a groove of the upper ring (5).

3. The multi-stage variable damping broadband vibration suppression device according to claim 1, characterized in that: The second vibration reduction assembly comprises a middle ring (8) and a middle coil (9); the middle ring (8) is fixedly connected to the middle part of the piston rod (13), and the middle coil (9) is wound in a groove of the middle ring (8).

4. The multi-stage variable damping broadband vibration suppression device according to claim 1, characterized in that: The third vibration reduction assembly comprises a lower ring (11) and a lower coil (12), the inner side of the lower ring and the outer side of the piston rod (13) are clearance-matched, and the lower coil (12) is wound in a groove of the lower ring (11).

5. 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 annular springs.

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