As for some of the unsteady vibration signals of diesel engine, false result may be provided by using Fourier analysis, thus error diagnosis would be induced.

• 传统的振动分析常采用傅立叶分析法,对于柴油发动机某些非平稳振动信号,傅立叶分析可能给出虚假的结果,从而导致错误诊断。