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为了深入研究升力体高超声速飞行器相对薄弱的横侧向稳定性问题,对滚转自由振荡风洞试验数据进行了谱分析,建立了多个气动频率余弦和形式的非定常滚转力矩模型。由于升力体高超声速飞行器的滚转自由振荡曲线呈现非定常、非线性和一定的周期性特征,且对试验结果的谱分析发现,在多种气动状态下,都存在除机械振动频率外的三个振动频率,将滚转力矩表达为此三个频率余弦和的形式。该滚转非定常气动力矩数学模型捕捉了试验的基本趋势涵盖了其主要的量值范围,反映了升力体高超声速飞行器横向流场扰流的多尺度和周期性特征。
In order to further study the transverse lateral stability of LHA hypersonic vehicle, the experimental data of the free-vibration wind tunnel were analyzed by spectrum, and several unsteady roll torque models of aerodynamic frequency cosine and form were established. Due to the unsteady roll, free-wheeling and periodic characteristics of the lift-body hypersonic vehicle, the spectral analysis of the test results shows that there exist three The vibration frequency is expressed in the form of cosine sum of these three frequencies. This roll-unsteady aerodynamic model captures the basic trend of the experiment and covers its main range of magnitudes, reflecting the multiscale and periodic characteristics of the lateral flow field turbulence in an ascending-body hypersonic vehicle.