An integrated weak thrust stand based on vertical pendulum and its performance characteristics
Micro-thruster is one of key payloads on high precision satellites.It is meaningful to pretest their thrusts in advance on ground.However,it is of difficulty to measure the thrust below micro-Newton on ground due to factors such as gravity acceleration and environmental disturbances.An integrated micro-thrust stand based on vertical pendulum(VP)structure is designed,to overcome above restrictions.The stand has an adjustable accuracy and can cover a wide dynamic range,in which the differential measurement method and integrated cable assembly are employed.Its performances are then characterized in common lab environment.The results show that the resolution in a fine mode can reach 10 nN,the spectral noise can reach 10nN/Hz1/2@10mHz and the range reaches 1mN,the measurement range in large range mode can reach 300mN,and the response bandwidth is DC-10Hz when the tested thruster has a mass of 330g.The stand can be calibrated whenever it is needed by both gravitational force and electromagnetic force.It can meet the on-ground test requirements of a variety of micro-thrusters.
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