组合支撑方式下气动多维力多点测量研究

飞行器的设计通常需以其模型在风洞试验中所获取的气动载荷为依据.对于大尺寸、大长径比的飞行器模型,其测试空间受限,常规支撑装置与测量方法难以满足风洞试验的尺寸与动态特性要求.针对上述问题,以压电传感器为核心测试元件,提出了一种结合张线支撑和尾部支撑的组合支撑方式,开发了一种支撑装置与测试元件一体化的气动多维力测试系统.分...

Research on Multi-point Measurement of Pneumatic Multi-dimensional Forces under Combined Support Mode

An aircraft design  was usually based on the pneumatic loads obtained by the model in wind tunnel tests. For aircraft models with large dimensions and large aspect ratios， the test space was limited， and it was difficult to meet the size and dynamic characteristics requirements of wind tunnel tests based on conventional support devices and measurement methods. To solve the problems， with piezoelectric sensors as the core test elements， a combined support mode was proposed with combining tension support and tail support， and a pneumatic multi-dimensional force test system integrated with support devices and test elements was developed. The balance relationship between the pneumatic forces and the supporting reaction forces of the model was analyzed， and the mechanics model of the pneumatic multi-dimensional forces acting on the model and the output of the force measurement units was established. The static calibration on the required force measurement units was performed to obtain the input and output performances of each force measurement unit. The calibration experiments were carried out on the whole system. The static calibration experimental results show that the nonlinearity and repeatability errors of the test system are both lower than 1%， and the maximum cross interference is as 2.04%； The dynamic pulse excitation experimental results show that the first-order natural frequencies of the three directions of the test system are as 195 Hz， 136 Hz and 273 Hz respectively， and the dynamic characteristics of the test system are improved significantly.