Error calibration method for torsion measurement system

Abstract

The invention discloses an error calibration method for a torsion pendulum measurement system. The method comprises the following steps: S100, applying a known calibration force to the torsion pendulum measurement system, and obtaining v measurement values by a system parameter calibration method, and according to the measurement values and the known calibration force, obtaining v system parameters for vibration characteristics; S200, using a Monte Carlo method to generate mutually independent normal distribution random sequences, sampling test data of test results according to the normal distribution random sequence, and obtaining system parameter calibration errors according to sampling results; S300, performing the step S200 N times to obtain n system parameter calibration errors, and using the maximum value and the minimum value of the n system parameter calibration errors as an error interval; and S400, using the torsion pendulum measurement system to measure the thrust or impulse, wherein the error of the obtained result is within the error interval. The method accurately estimates the error of the measurement result of the torsion pendulum measurement system, and improves the calibration efficiency and accuracy.

Description

technical field [0001] The invention relates to an error calibration method for a torsion measurement system, which belongs to the field of spacecraft micro-propulsion. Background technique [0002] Thrust and impulse are important propulsion performance indicators of micro thrusters. It is necessary to evaluate the thrust and impulse performance of the thruster during the design, development and application stages of the microthruster. Generally, the evaluation of thrust and impulse is directly measured by measurement systems such as torsion pendulum and pendulum, and the rotation angle of rotating parts such as torsion pendulum measured under the action of thrust or impulse is converted into thrust or impulse. Accurate calibration of system parameters and calibration error analysis directly determine the accuracy of thrust and impulse measurement results. Usually, in the calibration process of thrust and impulse measurement, only a certain test data is used to obtain the...

AI Technical Summary

Problems solved by technology

However, in actual measurement, random errors generated by system noise errors, constant force errors, etc. will have an impact on system parameters, thereby reducing the accuracy of existing measurement systems for thruster thrust impulse measurement results

In particular, the existing methods cannot accurately obtain the measurement error and its calibration error during the measurement process

Obstacles to analysis and evaluation of microthruster performance

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