Frequency-variable vibration isolator based on superelasticity SMA

Abstract

The invention discloses a frequency-variable vibration isolator based on superelasticity SMA. The frequency-variable vibration isolator comprises SMA driving wires, superelasticity SMA damping materials, a reset spring, a base provided with a groove and a top cover. The superelasticity SMA damping materials are arranged in the groove in the base and covered with the top cover. The edge of the base is connected with the edge of the top cover through the SMA driving wires, and the SMA driving wires are tensioned. Insulating mats are arranged between the SMA driving wires and the base and between the SMA driving wires and the top cover to carry out isolation. The reset spring is arranged outside the base in a sleeving mode to connect all the SMA driving wires in series, and then the two ends of the reset spring are connected with the two ends of a direct current power source respectively. By means of the vibration isolator, semiautomatic vibration suppression can be achieved, and damage caused by high-frequency impacting vibration can be reduced; meanwhile, the vibration isolator can be simply powered on to change the inherent frequency of the vibration isolator so that low-frequency vibration can be prevented form being amplified. The designed vibration isolator is simple in structure, small in part number and easy to machine and assemble, and engineering applications can be easily achieved.

Description

Technical field: [0001] The invention relates to a frequency-variable vibration isolator based on superelastic SMA, which adopts a shape memory alloy (SMA) with superelasticity as a damping material, and uses a shape memory alloy (SMA) with a one-way shape memory effect as a driver, which can be used As a vibration isolation device inside the spacecraft. Background technique: [0002] Spacecraft often experience vibration and shock during the rocket launch process. During these processes, the interior of the spacecraft is prone to structural damage and local instability. Especially in today's spacecraft carrying more and more electronic equipment, the stability of electronic equipment requires In the case of higher and higher altitudes, it is very important to reduce the damage of vibration shock to the electronic equipment inside the spacecraft. At present, vibration suppression methods can be mainly divided into three types according to whether external energy supply is r...

AI Technical Summary

Problems solved by technology

[0014] These passive vibration isolators can only achieve a specific vibration isolation effect within a specific range, but when encountering vibrations near their natural frequencies, not only cannot suppress the vibration, but can amplify the vibration, which will have a bad effect

In the present invention, the shape memory effect of shape memory alloy is used as the driver, and the semi-active vibration isolator designed in combination with the superelastic shape memory alloy damping material has not yet seen any relevant reports in China.

Images