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用高阶统计分析方法进行机械系统频响函数估计，结果表明，有２个特点：抑噪效果明显；不用明确系统的输入激励，只需根据系统的输出便可获得系统的频响函数。
The frequency response function of the mechanical system is estimated by high-order statistical analysis. The results show that there are two characteristics: obvious noise suppression effect; without explicit input excitation system, the system’s frequency response function can be obtained only based on the output of the system.