A test system for resonant frequency of launch vehicle thrust vector control swing engine

Abstract

The invention relates to a carrier rocket thrust vector control swing engine resonant frequency test system. A servo mechanism is a mechanism with a built-in displacement sensor, one end of the servo mechanism being stretchable; one end of the servo mechanism is fixed, and the stretchable end of the servo mechanism is fixedly connected with an engine nozzle; ground energy provides power for the servo mechanism; the upper end of the engine nozzle is connected through a swing shaft; one end of an angular displacement sensor is installed on an engine frame; the other end of the angular displacement sensor is stretchable and is fixedly connected with the engine nozzle; a tester sends out an instruction to control the servo mechanism to stretch or contract; the servo mechanism drives the engine nozzle to swing around the swing shaft in a reciprocating manner; the angular displacement sensor senses the angle change of the engine nozzle and outputs the sensed angle signals to the tester; the built-in displacement sensor of the servo mechanism outputs the linear displacement signals of the linear motion of the servo mechanism to the tester; and the tester performs comparison according to the received angle signals and linear displacement signals so as to obtain the resonant frequency of an engine.

Description

technical field [0001] The invention relates to a thrust vector control servo mechanism of a carrier rocket and dynamic characteristics of an engine, and provides a test method for a resonant frequency of an oscillating engine. Background technique [0002] The electro-hydraulic servo mechanism swing liquid engine of my country's launch vehicle realizes thrust vector control, but the rocket liquid engine usually has a large moment of inertia, low stiffness, and has a serious resonance tendency, with a minimum of only about 6Hz. [0003] The resonance characteristics of the engine will produce a load effect on the position closed-loop feedback control loop of the servo mechanism itself, which will affect the dynamic performance of the servo mechanism and the stability of the entire rocket control system. Targeted control strategies must be used for correction and compensation. However, the structural design of the engine is complex, and its resonance characteristics are diffi...

AI Technical Summary

Problems solved by technology

[0003] The resonance characteristics of the engine will produce a load effect on the position closed-loop feedback control loop of the servo mechanism itself, which will affect the dynamic performance of the servo mechanism and the stability of the entire rocket control system. Targeted control strategies must be used for correction and compensation

However, the structural design of the engine is complex, and its resonance characteristics are difficult to simulate and calculate, and can only be measured by means of experiments.

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