Method for detecting poses in ultralow temperature six-component balance calibration and reset process

Abstract

A method for detecting poses in an ultralow temperature six-component balance calibration and reset process comprises steps of applying a standard load to a calibration loading head in a low temperature cabinet through a force application mechanism; in the process of controlling the temperature of the low temperature cabinet from the normal temperature to the low temperature and to the ultralow temperature, collecting the low temperature deformation of the calibration loading head in the low temperature cabinet in the X direction through a group of high precision laser displacement sensors, and compensating the low temperature deformation of the calibration loading head in the X direction through a reset mechanism; applying the standard load to the calibration loading head through the force application mechanism; collecting the displacement of the calibration loading head outside the low temperature cabinet through a group of high precision laser displacement sensors; transmitting the displacement of the calibration loading head to a control system, enabling the control system to obtain the linear displacement and the angular displacement of the calibration loading head in the low temperature cabinet according to the displacement of the calibration loading head, and then performing compensation through the reset mechanism according to the linear displacement and the angular displacement of the calibration loading head.

Description

technical field [0001] The invention relates to a method belonging to the field of wind tunnel tests, in particular to a pose detection method in the process of calibrating and resetting an ultra-low temperature six-component balance. Background technique [0002] The wind tunnel balance is the basic measurement equipment for the wind tunnel force test, which is used to measure the size, direction and action point of the aerodynamic force (force and moment) acting on the test model in the wind tunnel test. The balance calibration system is a balance measurement device. By accurately applying static loads (forces and moments) to the balance according to known coordinate axes, the balance formula (the relationship matrix between the output signal and the load) is obtained to evaluate the performance of the balance. Due to the particularity and complexity of wind tunnel tests, as well as the large differences in the measurement requirements of different types of tests, the wind...

AI Technical Summary

Problems solved by technology

However, for special-purpose balances, such as ultra-low temperature balances, during the process of temperature changes, the loading head undergoes low-temperature deformation, resulting in the standard load applied by the loading system not acting on the geometric center of the loading head.

Bring large errors to the balance calibration

Moreover, in the process of calibrating different balances, the measurement reference of the deformation measuring device may change, and there is no data or index to show whether the measurement reference has changed, which will also bring errors to the balance calibration

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