Study and application of integrated balance based on micro data collector
Aiming at the problems of weak anti-interference ability,short transmission distance and complex cable in the traditional analog signal transmission mode of strain balance,an integrated digital balance based on micro high-precision data collector was developed and applied.By embedding the micro high-precision data collector into the strain balance and integrating the microcontroller unit(MCU)with floating-point operation ability in the micro high-precision integrated data collector,the real-time calculation and output of the actual force/torque of the balance were realized by combining the static calibration formula of the balance,and the transformation of the measurement signal of the balance from analog mode to digital mode was realized,thus improving the anti-interference ability of the test system.The anti-interference test in the wind tunnel showed that the signal transmission of the integrated balance was almost zero interference in the complex electromagnetic environment of the conventional hypersonic wind tunnel;the wind tunnel test of high lifting body model showed that the integrated balance test has good repeatability(high precision),and the data rules were consistent with the measured results of conventional balance.The maximum deviations of axial force coefficient,normal force coefficient and pitching moment coefficient were 2.1%,1.8%and 3.6%,respectively.
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