Calibration method of balance with air bridge of wind tunnel strain considering pressure influence

Abstract

The present invention provides a calibration method of a wind tunnel strain balance with an air bridge considering pressure influence. Working formulas, with a limited quantity, of a balance with an air bridge in different pressure states are employed to perform fitting and generate a general balance working formula suitable for a pressure range required by a test, and the general balance workingformula comprises pressure parameters. The pressure parameters are added into the general balance working formula of the balance with the air bridge, and when wind tunnel test is performed, an actually measurement pressure value and electrical signal increment value of each component of the balance are substituted into the general balance working formula to calculate and obtain accurate aerodynamic loading. Compared to the calculation result of a traditional balance formula, the general balance working formula can obtain more accurate aerodynamic loading so as to facilitate improvement of accuracy of the type of the wind tunnel test.

Description

technical field [0001] The invention relates to the field of wind tunnels, in particular to a method for calibrating a wind tunnel strain balance with an air bridge. Background technique [0002] The calibration of the wind tunnel strain balance with the air bridge under the required test state (different pressures) is the basis of the wind tunnel test (in the test, the force measurement system of the wind tunnel strain balance with the air bridge is used to measure the aerodynamic load). To determine the working formula of the balance with the air bridge in the corresponding state. During the wind tunnel test, the state that is basically the same as the calibration state is selected for the test. In order to ensure the accuracy of the test data, the wind tunnel test will not be carried out for the pressure state that is not involved in the balance calibration. In practice, in order to carry out more wind tunnel tests with different pressure states, it is necessary to incre...

AI Technical Summary

Problems solved by technology

In practice, in order to carry out more wind tunnel tests with different pressure states, it is necessary to increase the calibration state of the balance with the air bridge, which results in a too long calibration cycle of the balance with air

[0003] During the wind tunnel test, in order to adjust the pressure state to be consistent with the calibration state as much as possible, a high-precision pressure control system is usually used to adjust and control the pressure, but even with this method, the difference between the calibration state and the test state cannot be completely eliminated , which has a certain impact on the accurate use of the working formula of the balance with the air bridge, and also restricts the improvement of the quality of the wind tunnel test

Images