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Active vertical vibration isolation system

A vibration isolation system and active technology, applied in the direction of measuring gravitational field, measuring devices, instruments, etc., can solve the problems of complex system limit structure, prone to failure, complex single-degree-of-freedom motion limit mechanism, etc., to simplify system operation steps, simplified system structure and the effect of

Active Publication Date: 2013-07-17
北京普测时空科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this two-stage vibration isolation single-degree-of-freedom motion limiting mechanism is relatively complicated, which makes the system limiting structure complex and prone to failure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] figure 2 A schematic structural diagram of the active vertical vibration isolation system of the present invention is shown.

[0024] The active vertical vibration isolation system of the present invention mainly includes a vibration isolation device, a displacement detection device and a feedback control device. Among them, the vibration isolation device is used to isolate the object to be isolated from vibration; the displacement detection device is used to measure the displacement of the object to be isolated from vibration; the feedback control device controls the vibration isolation device according to the displacement measured by the displacement detection device, so that the displacement detection The displacement measured by the device is zero or close to zero.

[0025] like figure 2 As shown, in the vibration isolation device, the outer frame 1 includes a sealed top plate 101 and side plates 105, which provide structural support and protection for the entir...

Embodiment 2

[0048] Figure 4 A vertical vibration isolation system according to another embodiment of the present invention is shown.

[0049] exist Figure 4 In the embodiment shown, most of the components and structures are the same as those in Embodiment 1, and the only difference is that the rotating shaft in the limiting structure of the pendulum rod in Embodiment 1 is replaced by filaments.

[0050] like Figure 4 As shown, the filament 221 is connected to the bracket 103 by the fixing piece 222, and the bracket 103 is fixed to the outer frame 1. One end of the first-stage swing rod 201 connected to the rotating shaft is connected to the filament 221 , and one end of the second-stage swing rod 301 connected to the rotating shaft is connected to the filament 221 . Restricted by the filament, the pendulum rod 201 and the pendulum rod 301 can only rotate around the filament 221 . Therefore, in this embodiment, except for the rotation around the filament, other movements of the pend...

Embodiment 3

[0054] Figure 5 A vertical vibration isolation system according to yet another embodiment of the present invention is shown.

[0055] exist Figure 5 In the embodiment shown, most of the components and structures are the same as those in Embodiment 1, and the only difference is that the displacement detection device in Embodiment 1 is implemented with an interference displacement measurement device. The interference fringe signal between the reflected light beams of the secondary pendulum rods is used to measure the relative movement between the first and second level pendulum rods, and further to measure the displacement of the object to be isolated from the first level pendulum rods.

[0056] Similar to Embodiment 1, the displacement detection device of this embodiment is arranged between the first-stage swing rod and the second-stage swing rod of the vibration isolation device, and measures the relative relationship between the first-stage swing rod and the second-stage s...

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Abstract

The invention provides an active vertical vibration isolation system which comprises a first-level oscillating bar and a second-level oscillating bar on which is provided with an object to be subjected to vibration isolation. One ends of the two oscillating bars are connected in a suspending manner through a spring, the other ends of the two oscillating bars are respectively fixed on a rotating device, so that the displacement of the object to be subjected to vibration isolation relative to the first-level oscillating bar can be detected through detecting the relative displacement between thefirst-level oscillating bar and the second-level oscillating bar, and a feedback device controls the first-level oscillating bar through the detected displacement, so that the displacement becomes zero or close to zero. By adoption of the active vertical vibration isolation system provided by the invention, zero-friction flexible rotation of the oscillating bars can be ensured while the oscillating bar limit is realized, therefore no special limit mechanism is required, and the structure of the system is simplified and the vibration isolation accuracy of the system is improved.

Description

technical field [0001] The invention relates to absolute gravity measurement technology, in particular to an active vertical vibration isolation system, which is used for realizing vertical vibration isolation of objects to be isolated from vibration in the absolute gravity measurement system. Background technique [0002] In the field of precision physical experiment and measurement, ground micro-vibration has become the main source of noise in measurement. The ultra-low frequency vertical vibration isolation technology can greatly reduce the impact of environmental noise on precision measurement, which is of great significance and broad application prospects. Ultra-low frequency vertical vibration isolation technology includes active vibration isolation and passive vibration isolation, among which active vibration isolation technology can achieve better vibration isolation performance than passive vibration isolation. The existing "super spring" active ultra-low frequency...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V7/02G01B11/02
Inventor 王力军胡华伍康
Owner 北京普测时空科技有限公司
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