The installation dispersion of the aircraft structural strength test measurement system has a great impact on the accuracy of data acquisition,and the measurement results directly affect the validity of the test conclusion.The installation error of the measurement system is mainly concentrated in the metal bonded resistance strain gauge and the wire link,and the influence factors of strain transfer efficiency and the influence of wire length are analyzed through theoretical model and comparative test.The results show that the strain transfer efficiency decreases with the increase of the thickness of the bonding layer or the decrease of the elastic modulus.The influence of long conductor resistance on measurement error cannot be ignored,and the 3-wire connection method can effectively improve the influence of conductor resistance.
维普
万方数据