A Variable Damping Vibration Isolator Based on Ultrasonic Motor Adjustment

Abstract

A variable damping vibration isolator based on ultrasonic motor adjustment, including a base, a magnetorheological damper, and an adapter plate, mainly using the magnetorheological damper to support and consume vibration energy; the magnetorheological damper includes an upper cavity , lower chamber, connecting ring, permanent magnet, orifice, magnetic ring, ultrasonic motor, etc.; the magnetorheological fluid is stored in the upper and lower chambers composed of bellows, and the middle and both ends of the chamber are used as vibration The input and output ends realize the simulated piston movement of the damper without dynamic and static gaps, promote fluid flow, provide fluid damping, and can work without leakage during long-term on-rail operation. In addition, the magnetorheological damper uses an ultrasonic motor to drive the permanent magnet to rotate, and adjusts the coincidence degree between the permanent magnet and the orifice, that is, adjusts the number of orifices entering the magnetic field of the permanent magnet to change the damping size of the damper. After the ultrasonic motor rotates in place, it can be powered off and self-locked. The invention realizes the use of the ultrasonic motor to adjust the number of orifices in the magnetic field and adjust the damping size.

Description

technical field [0001] The invention relates to a variable damping vibration isolator based on ultrasonic motor adjustment, which belongs to the technical field of micro-vibration control. Background technique [0002] Inertial attitude actuators such as control moment gyroscopes have been widely used in high-precision spacecraft such as remote sensing satellites and space laboratories, and are key products for the spacecraft to achieve rapid attitude maneuvers and attitude stability. With the rapid development of aerospace technology, users have higher and higher requirements for satellite performance (such as camera resolution), and the payloads that realize these performances have higher and higher requirements for the attitude accuracy and stability of the spacecraft platform. However, during the high-speed rotation of the rotor of the inertial attitude actuator, it will produce a wide-band micro-vibration, which will become one of the main vibration sources of the space...

AI Technical Summary

Problems solved by technology

In view of the fact that there is inevitably a certain gap between the output rod and the sealing cavity, there is inevitably a slight liquid leakage, which not only reduces the liquid damping performance, but also may pollute the environment on the planet, making it difficult to meet the long-life working requirements

[0005] The traditional use of magnetorheological fluid for damping energy consumption mainly uses energized coils to generate a magnetic field, and uses the magnitude of the current to adjust the strength of the magnetic field, thereby changing the dynamic viscosity of the magnetorheological fluid in the orifice and adjusting the damping; when the current in the coil disappears, the magnetic field also disappears, and the magnetic field required by the magnetorheological fluid cannot be maintained, so the coil needs to be powered all the time, so it consumes more power

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