直升机使用的涡轴发动机比其他飞机用的发动机的工作环境苛刻得多,这是因为直升机飞行任务要求它在野外场地和海上船台起降及低空飞行与悬停等,自然沙尘、盐份和诱发沙尘环境极易造成机械损伤、磨损和腐蚀。另外,安装、使用、维修等因素的影响,使振动成为涡轴发动机常见的主要故障。在大振动量的状态下连续工作,将会加快发动机组件的磨损、损坏,以至停车而造成严重事故。因此,研究涡轴发动机的振动,在外场进行振动监测,作振动状态趋势分析和故障诊断,以便采取适当维修措施,提 The turboshaft used by helicopters is much harsher than the engines used by other aircraft due to the fact that helicopter missions require it to take off and land at low altitude and fly and hover in fields and offshore platforms, Induced dust environment can easily lead to mechanical damage, wear and corrosion. In addition, the installation, use, maintenance and other factors, the vibration of the turbine shaft to become a common major fault. Continued operation under conditions of large vibration will speed up the wear and tear of the engine components and cause serious accidents even when stopped. Therefore, the study of turbine shaft vibration, vibration monitoring in the field, for the vibration trend analysis and fault diagnosis in order to take appropriate maintenance measures to mention