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首页> 外文期刊>Journal of aerospace engineering >Transient Dynamics Research on the Force-Measurement System for Hypersonic Impulse Combustion Wind Tunnel Based on Inertia Compensation
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Transient Dynamics Research on the Force-Measurement System for Hypersonic Impulse Combustion Wind Tunnel Based on Inertia Compensation

机译：基于惯性补偿的超音速脉冲燃烧风洞测力系统的瞬态动力学研究

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摘要

The signal detected by a force-measurement system (FMS) is transient in an impulse combustion wind tunnel, and the transient property of the FMS will affect the measurement result significantly. This study presents a method to improve the measurement accuracy of aerodynamic loads and achieve the goal of transient measurement. First, the dynamics equation of the FMS is established. Second, the virtual static calibration and modal analysis are conducted to acquire its coefficient matrix, lower-order natural frequencies, and modes. Third, transient analysis is conducted to obtain its output responses. Results show that the mean value of the test signal can be treated as the output of the aerodynamic loads to a certain degree, and that the measurement accuracy can be improved by an order of magnitude after the inertia compensation. The measurement error rates of the drag, lift load, and pitching moment are lower than 8%, 10%, and 7%, respectively, when the frequency of the input load or moment is far from the natural frequency. However, not only can the balance easily be damaged, but the measurement errors also increase sharply when the frequency of the sine load is equal or close to the natural frequency. The results of a force measurement test show that the inertia compensation method can suppress the disturbance of the inertial loads to the output.
机译：力测量系统（FMS）所检测到的信号在脉冲燃烧风洞中是瞬态的，并且FMS的瞬态特性会严重影响测量结果。这项研究提出了一种方法来提高气动载荷的测量精度，以达到瞬态测量的目的。首先，建立了FMS的动力学方程。其次，进行虚拟静态校准和模态分析以获取其系数矩阵，低阶固有频率和模式。第三，进行瞬态分析以获得其输出响应。结果表明，在一定程度上可以将测试信号的平均值作为气动载荷的输出，在惯性补偿后，可以将测量精度提高一个数量级。当输入负载或力矩的频率远离固有频率时，阻力，提升负载和俯仰力矩的测量误差率分别低于8％，10％和7％。但是，当正弦负载的频率等于或接近自然频率时，不仅容易损坏天平，而且测量误差也会急剧增加。测力试验的结果表明，惯性补偿方法可以抑制惯性负载对输出的干扰。

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