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Resilient mounting electromagnetic type quasi-zero stiffness vibration-isolation device

A flexible support and quasi-zero stiffness technology, applied in the field of flexible support electromagnetic quasi-zero stiffness vibration isolation devices, can solve the problems of inability to change the magnitude and direction of negative stiffness, multi-connection structure, and increase the complexity of the system

Active Publication Date: 2020-02-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned quasi-zero stiffness vibration isolation device: on the one hand, more connection structures are required, which increases the complexity of the system, and once the design is finalized, the magnitude and direction of the negative stiffness cannot be changed, and different vibrations cannot be realized according to changes in external vibrations. Vibration isolation effect; on the other hand, more importantly, these negative stiffness mechanisms lack an effective amplification mechanism. In the case where a larger negative stiffness is required, a larger negative stiffness can only be achieved by increasing the geometric size. To some extent, the practical application is limited

Method used

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  • Resilient mounting electromagnetic type quasi-zero stiffness vibration-isolation device
  • Resilient mounting electromagnetic type quasi-zero stiffness vibration-isolation device
  • Resilient mounting electromagnetic type quasi-zero stiffness vibration-isolation device

Examples

Experimental program
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Effect test

Embodiment 1

[0042] like figure 1 As shown, a flexible support electromagnetic quasi-zero stiffness vibration isolation device includes an upper cover plate, a flexible support element, a linear optical axis, a cylinder body, a fixed magnet, a movable coil, a piston head, a positive stiffness elastic element and a lower base plate, A positive rigidity elastic element is fixedly connected between the upper cover plate and the lower base plate, and it is characterized in that: the bottom of the cylinder body is fixedly connected with the lower base plate, and the inside of the cylinder body is provided with mutually closed The upper and lower cavities, the piston head is located in the lower cavity, the linear optical axis is installed inside the cylinder body, the lower end of the linear optical axis is fixedly connected with the piston head, the upper end of the linear optical axis passes through the cylinder body, and is connected with the flexible support The lower end of the element is ...

Embodiment 2

[0044] According to the structure described in Embodiment 1, its parameters are designed as follows, according to the specific quality and allowable vibration value of the protected structure or equipment, determine the stiffness k of the positive stiffness elastic element

[0045]

[0046] In the formula, m is the mass of the protected structure or equipment simplified into a single degree of freedom;

[0047] g is the acceleration due to gravity;

[0048] d 0 is the allowable displacement of the protected structure or equipment;

[0049] Then, according to the specific number of turns of the movable coil and the parameters of the fixed magnet, it is determined that the negative stiffness generated between the above two is k n ,Have

[0050]

[0051] where k nis the negative stiffness produced by the movable coil between the two fixed magnets;

[0052] gamma k is a dimensionless parameter; while the stiffness k of the flexible support element 1 Press to confirm ...

Embodiment 3

[0072] like Figure 4 Shown is a comparison chart of the acceleration transmission coefficient of the vibration isolation device proposed by the present invention. The horizontal axis is the dimensionless frequency ratio ω / ω n , and the vertical axis is the transfer coefficient. When the support is relatively rigid, the transfer coefficient TR is at ω / ω n =1 reaches a peak value of 46, and then decreases with the increase of frequency; as the support becomes softer, the transfer coefficient TR gradually moves to the left, and finally at ω / ω n = 0, the maximum value 1 is obtained, and then decreases with the increase of frequency, indicating that the response of the protected structure in the frequency range shown in the figure is always smaller than the external excitation, that is, the vibration isolation device of the present invention realizes quasi-zero vibration isolation effect , in the frequency range shown in the figure, it can effectively reduce the interference of...

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PUM

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Abstract

The invention provides a resilient mounting electromagnetic type quasi-zero stiffness vibration-isolation device which comprises an upper cover plate, a resilient mounting element, a linear optical axis, a cylinder bock, a fixed magnet, a moving coil, a piston head, a positive stiffness elastic component and a lower bottom plate. The moving coil interacts with the fixed magnet in an upper cavity when being electrified so as to provide a negative stiffness force, the piston head moves in a lower cavity so as to produce a damping force, then the negative stiffness and the damping force are effectively amplified through the resilient mounting element, and the positive stiffness elastic component is combined, so that the integral stiffness of a vibration isolator is reduced to be close to a zero value, and a quasi-zero stiffness vibration-isolation effect is achieved. The resilient mounting electromagnetic type quasi-zero stiffness vibration-isolation device provided by the invention can realize the great reduction of the integral stiffness and the high-efficient improvement of a vibration-isolation performance with lower cost, and is suitable for structures or equipment with strict requirements on vibration isolation.

Description

technical field [0001] The invention belongs to the field of vibration isolation of civil engineering structures, in particular to a flexible support electromagnetic quasi-zero stiffness vibration isolation device. Background technique [0002] Vibration isolation device is a technical method to effectively isolate external vibration interference. It adds additional stiffness and damping between the ground surface and structure or equipment, thereby changing the overall dynamic characteristics of the system and achieving the purpose of reducing vibration interference. With the advancement of economy and technology, the requirements for vibration isolation of structures or equipment are becoming more and more stringent: for example, lithography equipment, which is indispensable in integrated circuit processing, has a permissible peak vibration speed of no more than 6 μm / s under the interference of environmental vibration , the corresponding frequency band is between 1-100Hz. ...

Claims

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Application Information

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IPC IPC(8): F16F15/03F16F15/04
CPCF16F15/03F16F15/04
Inventor 周鹏娄宇
Owner HARBIN INST OF TECH