Method of measuring micro thrust eccentricity of solid rocket engine without constraint condition

Abstract

The invention relates to a method of measuring micro thrust eccentricity of a solid rocket engine without constraint condition. The method comprises the following steps of configuring a certain load to the engine, wherein the flight of the engine is limited at a certain height and speed range; measuring and recording data through a gyroscope sensor in a free flying state; and calculating the processed data to obtain micro thrust eccentricity of the engine. Test data of an aircraft and thrust of the engine are established in a rectangular coordinate system of the aircraft. In the coordinate system, the thrust eccentricity is calculated finally by solving components of the thrust of the engine in three coordinate axis directions.

Description

technical field [0001] The invention belongs to the technical field of aerospace propulsion, in particular to a method for measuring the micro-thrust eccentricity of a solid rocket motor under unconstrained conditions. Background technique [0002] With the improvement of the level of my country's contemporary aerospace industry, the thrust vector measurement of rocket engines has gradually become the focus of engine development. Accurate measurement of thrust vector is very critical for evaluating engine performance indicators. Ideally, the thrust action line of a solid rocket motor should coincide with the central axis of the engine, but in fact, due to the limitation of machining accuracy, the geometric asymmetry of the engine, or the asymmetric flow of high-temperature and high-pressure gas through the nozzle and the throat of the nozzle The deformation caused by ablation causes the thrust line of the engine to deviate from the central axis of the engine, resulting in th...

AI Technical Summary

Problems solved by technology

The methods used today are all based on ground-mounted devices. When the engine is constrained in the six-component force test platform, there will be mutual interference between the six force-measuring components, and the deformation of the measurement frame due to heat and force , have greatly reduced the measurement accuracy of the thrust measurement system

In addition, the supporting design of the ground fixing system also has a great impact on the measurement accuracy, which will bring a large test error

In addition, since the installation state of each test is different in this method, the measurement system must be calibrated before each test, which increases the test workload and test cost.

Images