摘要
在采用单摆法进行某型号发动机整机转动惯量测量中,发现测量信号含有许多其他信号成分,这给准确提取发动机转动惯量相关参数带来一定的干扰。利用小波多分辨分析特性对测量信号进行处理分析,有效地将实际有用信号和干扰信号分开。通过对有用信号的分析,准确提取到了整个振动系统的振动频率、对数衰减及阻尼系数等参数,并分析了系统阻尼对振动频率的影响;通过对干扰信号的特征分析,弄清了干扰源,发现了实验设备存在的工艺缺陷。将小波分析应用于发动机实际工程测试和分析,能准确提取结构动力学参数、提高测量精度及进行故障分析。
Some undesired signals which brought some difficulties for extracting parameters of engine inertia moment were found in a certain engine inertia moment measurement.The useful signals were separated from the undesired signals through the wavelet multi-resolution-analysis.Some engine parameters such as vibrational frequency,logarithmic decrement and the damping ratio were obtained from the useful signals.The impact of the damping on the vibrational frequency of the system was also analyzed.The interference sources and the technique defects were found by the feature analysis of the undesired signals.Results show that the wavelet analysis is a useful tool that may be used to extract the structural dynamic parameters,improve the measurement accuracy and locate the damage in the engine system.
出处
《火箭推进》
CAS
2010年第6期52-55,共4页
Journal of Rocket Propulsion
基金
国家航天技术支撑项目
