摘要
针对某船用新型末级长叶片,为了获得共振转速和对应动频率,对叶片转子试验组件在高速动平衡试验台上进行动频试验,叶片振动信号经感应元件拾取后由遥测发射机和接收机传输至信号分析系统,获得多个通道下的叶片振动信息.试验数据表明,末级叶片靠近额度工作转速附近的"三重点"共振转速为一阶模态家族节径数k=7和k=8的共振转速均能避开运行工况,对应的动频率与数值分析结果对比可知:节径数k=7、k=8时的动频值相差不超过5%;数值计算和试验分析均证明叶片在工作转速内是安全可靠的.
In order to obtain the resonance frequency of a new designed last-stage blade on marine turbine, the blade is excited by compressed air in the high-speed dynamic balance test bench. The signal of blade vibration is transferred to a signal analysis system by the telemetry transmitter and receiver when it is picked up by the inductive components, and the information of blade vibration is then obtained under multiple channels. The test data show that the ＂triple point＂ resonance speed is a modal family for pitch diameter number k = 7 and k = 8, and the range of resonance speed is beyond the working speed, respectively. Compared with the results from the numerical calculation and the testing, the tolerance of dynamic frequencies does not exceed 5 % for pitch diameter number k = 7＆8. Numerical and experimental analysis prove that the blades in the operating speed are safe and reliable.
出处
《动力学与控制学报》
2016年第3期229-234,共6页
Journal of Dynamics and Control
关键词
末级长叶片
动频
无线电遥测
模态
last stage blade, dynamic frequency, radio telemetry system, modal analysis
