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针对目前采用CFD直接计算高速飞行器非定常气动力仍存在困难和不足的问题,本文提出了1种在频域内识别的间接方法,根据随机振动原理利用实测加速度响应识别飞行器气动力的动载荷。将整个飞行阶段分为若干时间段,每段时间内飞行器可近似为平稳随机振动,相应的气动力也可作为平稳随机激励。利用实测加速度响应生成功率谱矩阵,然后引入逆虚拟激励法化为虚拟响应,快速精确计算出了飞行器气动力的功率谱矩阵。工程实例验证了本方法的高效性和正确性。
In order to solve the problem of using CFD to calculate the unsteady aerodynamic force of high-speed aircraft, a new indirect method of identifying the aerodynamic force in the frequency domain is proposed in this paper. According to the principle of random vibration, the aerodynamic dynamic load of the aircraft is identified by the measured acceleration response. The entire flight stage is divided into several time periods, each time the aircraft can be approximated as a steady random vibration, the corresponding aerodynamic force can also be used as a steady random excitation. The power spectrum matrix is generated by using the measured acceleration response, and then the inverse virtual excitation method is introduced into the virtual response. The power spectrum matrix of the aerodynamic force of the aircraft is quickly and accurately calculated. The engineering example verifies the efficiency and correctness of this method.