According to the frequency domain response experiment, the suitable chaotic signal is applied to the practical mechatronic system. The estimated parameters are convergent, and the frequency domain character of the system is obtained. 通过频域响应实验设计出适合于机电系统辨识的混沌信号进行辨识，辨识结果收敛，得到了系统的频域特性。
Using the frequency domain analysis system, the experiment results of different length coupling point has show that the frequency domain analysis system can measure the coupling intensity of polarization maintaining fibers ( PMF ), reduce the influence of birefringence dispersion and prolong the measurement range. 对频域分析系统进行了实验测试，通过不同长度的耦合点测试证明了频域分析系统能够测量保偏光纤耦合强度，并且减少了折射色散的影响，提高了偏振耦合测试距离。
At first, theoretical analysis and numerical simulation are done, and fractional unit circuit is designed by frequency domain approximation method. The values of the various components are given, and the circuit experiment is done. 分别对它们进行理论分析和数值仿真，采用频域近似方法设计了分数阶单元电路，给出了各种元器件的参数值，进行电路实验。
Optimized parameter design method for tuned mass damper are discussed in this paper using frequency domain analysis theory. Numerical results show that TMD can control the vibration of structures efficiently. An experiment result experiment is given to verify the validity of the theory. 应用结构被动控制的频域分析理论，对调频质量阻尼器多点控制时的参数进行优化设计，并用实验结果验证了理论的正确性。
Two algorithms ( one cross-spectrum based in frequency domain and the other one is ITD method in time domain ) for mode parameter identification are realized and adjacent result from experiment data of a scaled model obtained respectively. 研究了输入未知条件下的海洋平台模态参数识别方法。实现了基于互谱的频域方法和时域的ITD方法，方法应用于实验实测数据，二种方法结果吻合的较好，可以互相印证。
