At last, the paper focused on ratio of frequency spectrum method and basic frequency shift method, then designed and implemented the algorithm for both approaches, at last used the forward model to inverse the Q value and compared them with the theory Q value.
最后重点研究了谱比法和主频偏移法，进行了这两种方法的算法设计及实现，并应用于正演模型分别反演出Q值并与理论值进行比较。
By using inverse matrix of frequency response function in this paper, the spectrum of dynamic forces acting on the set has been identified.
本文采用频响函数矩阵求逆法，辨识了立式机组动态力的幅值谱。
Frequency spectrum distribution of fractional Fourier inverse transform was given. It is equal to fresnel diffraction optical path distribution of parallel beam illuminating object in free space.
以平面波照明物体的自由空间菲涅耳衍射光场分布为对象，分析了其与分数傅里叶逆变换标准频谱分布的等效性；