A piezoelectric active vibration isolation mechanism and its method for reducing the natural frequency of the vibration system

A technology of vibration system and natural frequency, which is applied in the direction of control/regulation system, non-rotational vibration suppression, non-electric variable control, etc. It can solve the problems of attenuating low-frequency interference, high structural natural frequency, and high rigidity of piezoelectric ceramics, etc., to achieve suppression Low-frequency interference, expanded usage scenarios, and high attenuation effects

Active Publication Date: 2017-03-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high rigidity of piezoelectric ceramics leads to high natural frequencies of the structure, making it difficult to effectively attenuate low-frequency interference. Therefore, a double-layer serial piezoelectric active actuator structure is proposed, which can effectively attenuate low-frequency vibrations and improve the active control ability of multi-frequency bands

Method used

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  • A piezoelectric active vibration isolation mechanism and its method for reducing the natural frequency of the vibration system
  • A piezoelectric active vibration isolation mechanism and its method for reducing the natural frequency of the vibration system
  • A piezoelectric active vibration isolation mechanism and its method for reducing the natural frequency of the vibration system

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Embodiment 1

[0037] Referring to Figure 1(a), figure 2 And Fig. 3 (a), a kind of piezoelectric active vibration isolation mechanism, comprises first flexible hinge 12b, piezoelectric actuator, force sensor 13a, second flexible hinge 12a and controller, one end of described first flexible hinge 12b For connecting the base platform 16, the other end of which is sequentially connected to the piezoelectric actuator, the force sensor 13a and the second flexible hinge 12a, and the other end of the second flexible hinge 12a is used to connect to the load platform 11;

[0038] Both the piezoelectric actuator and the force sensor 13a are connected to the controller;

[0039] The force sensor 13a is used to detect the vibration signal of the load platform 11, and transmit the vibration signal to the controller, and the controller adopts the PI feedback control method to control the piezoelectric actuator to apply force on the load platform 11, thereby exerting force on the load platform 11. perform...

Embodiment 2

[0057] A piezoelectric active vibration isolation mechanism, including a first force sensor 23b, a spring bellows 27, an intermediate mass 26, a first flexible hinge 22b, a piezoelectric actuator, a second force sensor 23a, a second flexible hinge 22a and a control device, among them,

[0058] One end of the first force sensor 23b is used to connect to the base platform 28, and the other end is sequentially connected to the second force sensor 23b, the spring bellows 27, the intermediate mass 26, the first flexible hinge 22b, the piezoelectric actuator, A second force sensor 23a, a second flexible hinge 22a, the other end of the second flexible hinge 22a is used to connect to the load platform 21;

[0059] The first force sensor 23b, the piezoelectric actuator and the second force sensor 23a are all connected to the controller;

[0060] The first pressure sensor 23b and the second pressure sensor 23a are used to detect the vibration signals of the base platform 28 and the loa...

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Abstract

A piezoelectric active vibration isolation mechanism comprises a first force sensor (23b), a spring bellows (27), a middle mass block (26), a first flexible hinge (22b), a piezoelectric actuator, a second force sensor (23a), a second flexible hinge (22a) and a controller, one end of the first force sensor (23b) being used for connecting a base platform (28), and the other end thereof being connected sequentially to the spring bellows (27), the middle mass block (26), the first flexible hinge (22b), the piezoelectric actuator, the second force sensor (23a) and the second flexible hinge (22a). The first force sensor (23b) and the second force sensor (23a) are respectively used for detecting vibration signals of the base platform (28) and of a loading platform (21), and respectively transmitting the detected vibration signals to the controller so that the controller controls the piezoelectric actuator to apply a force onto the loading platform (21), thereby compensating the loading platform (21). The piezoelectric active vibration isolation mechanism utilizes a two-stage series-connected suspension structure, effectively reducing the inherent frequency of the structure and being able to effectively suppress low-frequency interference of the slight vibration in a precision device. A method of reducing the inherent frequency of a vibration system is further disclosed.

Description

technical field [0001] The invention belongs to the field of micro-vibration suppression, and more specifically relates to a piezoelectric active vibration isolation mechanism and a method for reducing the natural frequency of a vibration system. Background technique [0002] Traditional passive vibration isolators are composed of mass-spring-damping elements. Due to the inherent contradiction between the transmission rate of low-frequency vibration and the attenuation rate of high-frequency vibration, they cannot meet the vibration isolation requirements of precise micro-vibration. Therefore, some New technologies, new methods to improve this situation. For example, during the satellite’s in-orbit operation, the normal operation of the equipped equipment will cause the overall and local reciprocating motion of the satellite with a small amplitude. These micro-vibrations are the main factors affecting key performances such as pointing accuracy and imaging quality of high-pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16F15/02F16F15/03
CPCF16F15/02G05D19/02
Inventor 陈学东陶业英李小清王敏明平光李明
Owner HUAZHONG UNIV OF SCI & TECH
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