某机载雷达多自由度振动参考谱制定研究

本文阐述了一种基于实测振动数据的机载雷达多自由度振动参考谱制定方法。采用坐标变换法,在时域内从结构的加速度响应中提取出结构的刚体自由度振动。通过对结构刚体自由度振动的信号分析,得到各自由度的自功率谱密度(PSD)和各自由度之间的相干函数γ2(f)和相位θ(f),形成多自由度振动试验参考谱矩阵。用此参考谱进行多轴振动环境试验,可真实地模拟机载雷达的实际振动环境。

Study on Developing Multiple Degrees of Freedom Vibration Reference SDM of Air-borne Radar

This paper describes an air-borne radar MDOF （multiple degrees of freedom） vibration reference SDM （spectrum density matrix） development method based on the measured field data. Using the method of coordinate transformation, the structure vibration of rigid body DOFs can be derived from the measured acceleration responses in time domain. The PSD （power spectrum density） and CSD （cross power spectrum density） terms are estimated by the rigid body vibration data analyzing. The profile SDM can be used for multi-axis vibration testing to simulate a much more accurate environment than that of a single axis testing.