【摘要】 风洞实验中飞行器表面的摩擦力不足空气压力的0.1%,对于小面域、小量程的表面摩擦力测量，存在准确性与力天平可靠性相悖的矛盾。因此，基于杠杆原理及石英的压电效应，该文设计了一种对毫牛级表面摩擦力放大测量的二维力压电传感器，并通过静态标定实验和动态脉冲激励实验分别评价其测试性能。实验表明，该传感器量程可低至50 mN,非线性误差和重复性误差均小于1%,固有频率为2 428 Hz,满足风洞试验中表面摩擦力的测量需求。更多还原

【Abstract】 In the wind tunnel experiment, the friction of the aircraft surface is less than 0.1% of the air pressure. For the measurement of surface friction in small area and small range, there is a contradiction between the accuracy and the reliability of the force balance. In order to solve the above problems, a two-dimensional force piezoelectric sensor which can amplify and measure the milli-newton level surface friction is designed based on the lever principle and the piezoelectric effect of quartz. The test performance is evaluated by the static calibration experiment and dynamic pulse excitation experiment. The experiments show that the measuring range of the sensor can be as low as 50 mN, both the nonlinearity error and repeatability error are lower than 1%, and the natural frequency is 2 428 Hz, which can meet the measurement requirements of surface friction in wind tunnel tests.更多还原