Design And Research Of Hold-down/release Device Based On Memory Alloy

In the mission of space launch satellite,it is necessary to use hold-down/release device to realize the hold-down of satellite antenna,so as to ensure that the deployment load of antenna is not affected by the launching load during the launching process,and release the deployment load of satellite antenna at an appropriate time to deploy the antenna.At present,pyrotechnic devices are mainly used in China to realize this function.However,with the development of micro-satellites,such as micro-satellites,nano-satellites and cubic micro-satellites,the requirements of satellite accessories are also increasing.Pyrotechnic devices are becoming difficult to meet the needs.So it is necessary to develop hold-down/release devices with low impact and no pollution.In this paper,according to the requirement of deployment of a microsatellite antenna,a hold-down/release device using memory alloy wire as driving source is designed to meet the requirement of deployment of the satellite antenna.Firstly,according to the technical specifications proposed by the launch mission,the design of hold-down/release device based on memory alloy was carried out.The design of the scheme revolves around the idea of "rotating control sliding,using small force to control large load".Secondly,the performance testing platform of the memory alloy was built,and special fixture for testing memory alloy wire was designed.A series of performance parameters were obtained by testing experiments,such as recovery rate,resilience,phase transition temperature and resistivity.Then,the driving force,the driving stroke and the power supply mode were determined,which laid the foundation of the calculation of the plane spring and the design of drive block in the device.Then,according to the testing results and the design of hold-down/release device,the spring drive device was calculated and selected;the drive block was designed and calculated.With relevant information,the materials of this device were selected,which can meet the hold-down and release design indexes.Finally,using the Abaqus finite element analysis software,the strength of the hold-down/release device was analyzed.In the pressed state,the strength of the components was verified;considering the working environment of this device,the thermal mechanical analysis of the device was carried out.The result showed that the micro deformation has no effect on the movement of the drive block with the shell under high temperature.Then the feasibility of the device was verified.The release function of this device was analyzed using Adams dynamics.According to the analysis results,the driving spring design was optimized.And the response time of the device was analyzed,which was helpful to provide a time response basis for controlling the deployment of the antenna.