相关分析及富立叶分析是随机振动理论借助的重要分析方法。近十几年来,由于电算技术的进步,特别是快速富立叶变换的问世和微处理机的发展,随机振动理论在许多技术领域内得到越来越广泛的应用,解决了许多从前难于解决的问题。从七十年代初起,随机振动理论开始比较广泛地用来解决汽车及其有关的机械工程中的各种问题。用随机振动的观点来研究汽车的行驶平顺性,已经取得了较为成熟的经验,从而给汽车设计理论增添了崭新的内容。但在汽车工程的其它一些方面(例如噪音分析和故障诊断等),则仍处于探索阶段,许多问题的完满的解决,还有待人们付出更多更辛勤的劳动。但无论如何,国外科技界在这个研究方向上孜孜不倦的努力,以及逐 Correlation analysis and Fourier analysis are important analytical methods with the help of stochastic vibration theory. In recent decades, due to advances in computing technology, especially the advent of fast Fourier transform and the development of microprocessors, stochastic vibration theory has been more and more widely used in many fields of technology, solving many problems that have not been solved before The problem. Since the early 1970s, stochastic vibration theory has been widely used to solve various problems in automobiles and their related mechanical engineering. Researching the ride comfort of vehicles with the viewpoint of random vibration has gained more mature experience, thus adding a brand new content to the theory of automobile design. However, other aspects of automotive engineering (such as noise analysis and fault diagnosis) are still in the exploratory stage. Many problems are satisfactorily solved and more and more people are required to work harder. However, in any case, foreign scientific and technological circles in this research direction tireless efforts, and by