A pendulum-type micro-impulse testing device and testing method

Abstract

The invention discloses a dangling type micro-impulse testing device and method. A dangling system is fixed in a vacuum box, a thruster ignition power source, a circuit switch, a wire and a miniature thruster are integrated to the dangling system in a modularization mode, a dangling type micro-impulse testing system works in a vacuum environment, a remote control switch serves as a circuit switch to conduct remote control ignition, and influences of a miniature thruster ignition resistance wire power source and the wire on testing results are eliminated. A laser Doppler measurer is installed outside the vacuum box, a light path of a single beam laser head in the laser Doppler measurer is adjusted to be centered with a target reflector, the deviation of outgoing beams and incident beams is eliminated, displacement changes of the thruster are accurately measured, and influences of air friction during dangling are avoided. By means of the dangling type micro-impulse testing device and method, the working force of a miniature rocket motor in a short time can be tested, the micro impulses can be tested, and the impulse testing accuracy is high.

Description

technical field [0001] The invention relates to the field of micro propeller testing, in particular to a pendulum type micro impulse testing device and testing method. Background technique [0002] Miniaturization is an important direction in the development of modern spacecraft. Micro spacecraft should have the characteristics of fast response, high precision and high reliability, and these characteristics are directly related to the propulsion system of micro spacecraft, so higher requirements are put forward for the micro propulsion system. General micro-propulsion systems provide millinewton-level micro-thrust, and the working time is very short. Therefore, the performance test and calibration of micro thrusters require a measurement system with high resolution and high frequency response. [0003] The measurement of the impulse of micro propulsion is a very difficult and complicated task. On the one hand, the thrust generated by the micro-thruster itself is very smal...

AI Technical Summary

Problems solved by technology

The micro-thrust measurement of the micro-thruster has to solve the following two problems: (1) the separation of the self-weight and thrust of the micro-thruster; (2) the influence of the power supply system of the micro-thruster on the thrust measurement

The structure of the system can keep the moving distance of the propeller small in the up and down direction when the micro propeller is working, which is beneficial to LVDT to measure the left and right swing displacement of the micro propeller. The disadvantage of this system is that it uses four movable joints, so the system has a large Friction, so after a single pulse, the vibration displacement signal of the system decays quickly

[0006] There are some urgent problems to be solved in the existing micro-impulse test device in terms of eliminating the influence of air damping, the mechanical friction of the system and the resistance caused by the connection of circuit wires

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