Fiber balance aerodynamic measuring system and method

Abstract

The invention discloses a fiber balance aerodynamic measuring system and method. The system comprises a fiber balance aerodynamic measuring device, a signal demodulation device and a data processing system. The method comprises: combining output signals of fiber F-P strain gauges on measuring beams of a fiber balance body to determine output of each component of a fiber aerodynamic measuring balance; subjecting the fiber balance body with the fiber F-P strain gauges to static performance test to obtain static performance of each component of the fiber balance body; subjecting the fiber balancebody to static calibration to obtain an application formula of the fiber balance body; installing a fiber balance aerodynamic measuring device in a wind tunnel test segment, and carrying out a wind tunnel model force test to obtain aerodynamic load applied on a wind tunnel test model. The wind tunnel balance force test technique and the fiber sensing technique are combined herein, the measuring precision of a balance under high temperature, strong electromagnetism, damp and other severe environments is effectively improved, and the requirement of space vehicles for aerodynamic fine measurement is met.

Description

technical field [0001] The invention belongs to the technical field of aerospace dynamometric tests, and in particular relates to a wind tunnel test model fiber optic balance aerodynamic force measurement system and a measurement method. Background technique [0002] With the development of my country's aerospace technology, higher and higher requirements are put forward for the precise measurement of aerodynamic forces of various aerospace vehicles. In hypersonic wind tunnel tests, in order to prevent the test gas from condensing, the total temperature of the airflow is usually very high (generally 400K-1000K, and the hypersonic low-density wind tunnel can reach up to 3100K), within the effective time of the test (tens of seconds to a few minutes), the ambient temperature of the balance can reach up to 200 ℃ ~ 300 ℃, which will cause serious temperature interference to the output of the traditional resistance strain balance (the measurement error will increase several times...

AI Technical Summary

Problems solved by technology

In hypersonic wind tunnel tests, in order to prevent the test gas from condensing, the total temperature of the airflow is usually very high (generally 400K-1000K, and the hypersonic low-density wind tunnel can reach up to 3100K), within the effective time of the test (tens of seconds to a few minutes), the ambient temperature of the balance can reach up to 200 ℃ ~ 300 ℃, which will cause serious temperature interference to the output of the traditional resistance strain balance (the measurement error will increase several times or even ten times), directly affecting the test Reliability of the data, difficult to correct

In addition, the output signal of the resistance strain balance will be interfered by the surrounding electromagnetic field.

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