Rotary calibration method for rocket engine thrust vector calibration

Abstract

The invention provides a rotary calibration method for rocket engine thrust vector calibration and belongs to the technical field of piezoelectric sensor measuring. According to the rotary calibrationmethod, on the basis of the structural principle of a measuring cell, a vector force testing system is set up firstly and subjected to error source analysis, a calibration matrix needing to be calculated is obtained through a linear calibration method, a sensitivity analysis model of the calibration accuracy to the coupling coefficient is set up, and it is concluded that the interference coefficient of the main direction to the side direction is the most important factor affecting the testing accuracy; then through a force vector offset calibration system, error analysis is conducted to search and obtain the mechanism of interference of the main direction on lateral force; a mathematical model of contact force of a calibration rod and a spherical gasket as well as the calibration rod anda tapered-face gasket is set up, and the oval geometric distribution of the lateral force in main direction calibration is obtained; and finally, aiming at the periodic characteristics of oval distribution, on the basis of the thought of error homogenization, according to the put-forward rotary calibration method, the rocket engine thrust vector is calibrated.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric sensor measurement, and relates to a rotation calibration method for rocket engine thrust vector calibration. Background technique [0002] With the rapid development of modern aerospace technology, the rocket engine plays a vital role as the core component of the spacecraft. The accurate measurement of the thrust vector of the rocket engine is of great significance for controlling the operating attitude of the aircraft and improving the target hitting accuracy. However, during the attitude adjustment process of the spacecraft, factors such as changes in the mass of the rocket engine and the offset of the nozzle axis will cause the rocket thrust vector to deviate from the ideal situation, resulting in lateral force and thrust deflection. In addition, affected by factors such as manufacturing errors, assembly errors, and structural deformation, it is difficult to guarantee the test accuracy o...

AI Technical Summary

Problems solved by technology

However, there are currently few articles starting from the structural principle of the dynamometer, exploring the factors affecting calibration and measurement errors, and studying the loss mechanism and offset mechanism in force loading. Therefore, it is necessary to design a new method to achieve force calibration.

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