Since 1960s , the mechanical strength reliability and structural system reliability , whose main failure modes are fatigue and service life , has achieved a great deal of development and been applied to engineering machine , aeronautical and astronautical engineering , electric apparatus , bridges , ship , civil engineering etc . with the developing of space technology and tendency of machine towards high speed , precision , automation , one realizes the importance of mechanism reliability based on the accuracy of motion , for the errors of mechanism occurred more often than that of structure , especially in the field of aeronautical and astronautical engineering and operate system of weapon 上个世纪60年代以来，以疲劳、寿命为主要失效模式的机械强度可靠性、结构体系可靠性研究得到了很大发展，并迅速应用于工程机械、航空航天、电器设备、桥梁、船舶、土木工程等。随着空间技术的发展以及机械的高速精密化、自动化发展，人们逐渐认识到以机构动作参数的准确可靠为主要指标的可靠性问题日益突出，因为在很多机械上机构的故障多于结构的故障，尤其是在航空航天及武器操纵系统方面。由于这些机构的运转特性，振动可靠性的研究亦占有突出的位置。
