前言许多产品在其运输和工作阶段都经受随机振动环境。飞机及航天器的发动机噪声和气动力噪声、公路及铁路运输、海浪颠波及地震等引起的振动均属随机振动。主要由于试验手段的限制,过去通常用正弦扫频振动试验来模拟随机振动环境。正弦振动试验每一时刻仅在一个频率上输入能量,而随机振动环境则在很宽的频带上同时激振,因此,它们对产品的作用无论从结构损伤或仪器功能失效方面来讲都是不一样的。显然,宽带随机振动试验更接近于实际环境,因此愈来愈受到重视。 Many products are subject to random vibration during their transport and work phases. Aircraft and spacecraft engine noise and aerodynamic noise, road and rail transport, surf waves and earthquakes caused by vibration are random vibration. Mainly due to the limitations of experimental methods, in the past usually sinusoidal sweep vibration test to simulate the random vibration environment. Sine vibration tests input energy at only one frequency at a time, while random vibration conditions simultaneously excite over a wide frequency band, so their effect on the product is neither in terms of structural damage nor failure of the instrument the same. Obviously, broadband random vibration test is closer to the actual environment, so more and more attention.