Stewart vibration isolation platform with macro fiber composite plates and control method thereof

Patent metadata

Field	Value
Publication number	US-12416345-B2
Application number	US-202217687415-A
Country	US
Kind code	B2
Filing date	Mar 4, 2022
Priority date	Mar 5, 2021
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

The present disclosure discloses a Stewart vibration isolation platform with Macro Fiber Composite (MFC) plates. The vibration isolation platform includes: an upper load platform, a lower foundation platform, a controller, and a plurality of single-leg vibration isolation unit groups arranged between the upper load platform and the lower foundation platform. Each of the single-leg vibration isolation unit groups includes two single-leg vibration isolation units. The single-leg vibration isolation unit includes a first diaphragm spring and a second diaphragm spring. An MFC actuator and an MFC sensor are respectively arranged on two sides of the first diaphragm spring and the second diaphragm spring. The MFC actuators and the MFC sensors are all connected to the controller.

First claim

What is claimed is:

1. A Stewart vibration isolation platform with Macro Fiber Composite (MFC) plates, comprising: an upper load platform, a lower foundation platform, a controller, and a plurality of single-leg vibration isolation unit groups arranged between the upper load platform and the lower foundation platform, wherein each of the single-leg vibration isolation unit groups comprises two single-leg vibration isolation units;
the single-leg vibration isolation unit comprises a first diaphragm spring and a second diaphragm spring; an MFC actuator and an MFC sensor are respectively arranged on two sides of each of the first diaphragm springs and the second diaphragm springs; and
the MFC actuators and the MFC sensors are all connected to the controller.

2. The Stewart vibration isolation platform with the MFC plates according to claim 1 , wherein there are three single-leg vibration isolation unit groups; and the three single-leg vibration isolation unit groups are distributed in the peripheral direction of the upper load platform and the lower foundation platform.

3. The Stewart vibration isolation platform with the MFC plates according to claim 1 , wherein a plurality of upper groove groups are formed in a lower surface of the upper load platform; each of the upper groove groups comprises two upper grooves; a first threaded through hole is formed in each of the upper grooves; a plurality of lower groove groups are correspondingly formed in an upper surface of the lower foundation platform; each of the lower groove groups comprises two lower grooves; a second threaded through hole is formed in each of the lower grooves;
an upper end of the single-leg vibration isolation unit is clamped in the upper groove, and is fixed to the upper load platform through the first threaded through hole; and a lower end of the single-leg vibration isolation unit is clamped in the lower groove, and is fixed to the lower foundation platform through the second threaded through hole.

4. The Stewart vibration isolation platform with the MFC plates according to claim 1 , wherein the single-leg vibration isolation unit comprises an upper mounting corner seat, a first long mounting rod, a first short mounting rod, a first diaphragm spring, a second diaphragm spring, a second short mounting rod, a second long mounting rod, and a lower mounting corner seat;
one side of the upper mounting corner seat is fixedly connected to the lower surface of the upper load platform; the other side of the upper mounting corner seat is fixedly connected to one end of the first long mounting rod; the other end of the first long mounting rod is fixedly connected to one end of the second short mounting rod;
one side of the lower mounting corner seat is fixedly connected to the upper surface of the lower foundation platform; the other side of the lower mounting corner seat is fixedly connected to one end of the second long mounting rod; the other end of the second long mounting rod is fixedly connected to one end of the second short mounting rod;
one end of the first diaphragm spring is fixed between the first long mounting rod and the first short mounting rod; the other end of the first diaphragm spring is fixed to the other end of the second short mounting rod by a bolt;
one end of the second diaphragm spring is fixed between the second long mounting rod and the second short mounting rod; the other end of the second diaphragm spring is fixed to the other end of the first short mounting rod by a bolt;
the MFC sensors are pasted on the opposite sides of the first diaphragm spring and the second diaphragm spring; and the MFC actuators are pasted on the other sides of the first diaphragm spring and the second diaphragm spring.

5. The Stewart vibration isolation platform with the MFC plates according to claim 4 , wherein
external screw threads are formed in one end of each of the first long mounting rod, the first short mounting rod, the second long mounting rod, and the second short mounting rod; and a first threaded hole with internal screw threads is formed in the other end of each of the first long mounting rod, the first short mounting rod, the second long mounting rod, and the second short mounting rod.

6. The Stewart vibration isolation platform with the MFC plates according to claim 4 , wherein both the upper mounting corner seat and the lower mounting corner seat are prismatic structures with chamfered cross sections;
the chamfered cross section is a cross section formed by crosscutting a first straight line on an end surface of a prismatic structure and a second straight line on a side surface of a prism; the first straight line is parallel to the second straight line;
a second threaded hole is formed in the chamfered cross section; the second threaded hole is used to fix one end of the first long mounting rod or the second long mounting rod;
a third threaded hole is formed in a non-crosscutting end surface of the prismatic structure; and the third threaded hole is used to fix the upper mounting corner seat to the lower surface of the upper load platform or fix the lower mounting corner seat to the upper surface of the load foundation platform.

7. The Stewart vibration isolation platform with the MFC plates according to claim 4 , wherein both the first diaphragm spring and the second diaphragm spring are of plate beam structures; and through holes are formed in two ends of each plate beam structure.

Assignees

• Univ Shanghai

Inventors

• Pu Huayan
• Fang Xuan
• Wang Min
• Sun Yi
• Ding Jiheng
• Peng Yan
• Xie Shaorong
• Luo Jun

Classifications

• F16F2230/18

  Control arrangements · CPC title

• F16F2228/066

  Variable stiffness · CPC title

• F16F2228/04

  Frequency effects · CPC title

• F16F15/08

  with rubber springs {(grommet- or bushing-type resilient mountings F16F1/3732, F16F1/38); with springs made of rubber and metal (arrangement of internal-combustion or jet-propulsion units B60K5/12; mounting of propulsion plants on vessels B63H21/30; mounting of vehicle drivers' cabs B62D33/0604)} · CPC title

• B64G1/22

  Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles · CPC title