摘要
介绍了由加速度传感器获得的交流接触器表面的振动信号,经过数据预处理、声辐射效率指数曲线和A计权曲线,可计算其远场噪声功率级,同时计算表面振动速度级。综合两个判据,采用测振法同时对交流接触器振动噪声性能进行在线检测。检测结果表明,除去不稳定样本点,远场噪声功率级精度在2 dB以内,即在强背景噪声下,测量系统能实现交流接触器振动噪声性能的在线检测。
Through vibration measuring,the online detection for AC contactor＇s vibration and noise performance was realized.The acceleration signal of AC contactor＇s surface vibration was got from acceleration sensor,then go through data processing,add sound radiation efficiency index curve and weighting curve to calculate the remote noise value.At the same time,calculate its vibration velocity level.According to these two magnitudes,make a judgement for AC contactor＇s vibration and noise performance.The experiment results indicate that the precision of final noise value is less than 2dB except for some unstable samples by this detecting method.To some extent,this measuring system can apply to the on line noise detecting of AC contactor under the environment with strong background noise.
出处
《低压电器》
北大核心
2011年第18期21-23,35,共4页
Low Voltage Apparatus
基金
福建省自然科学基金(010J01294)
国家自然科学基金培育计划项目(JB-ZR1102)
关键词
交流接触器
振动噪声性能
在线检测
AC contactor
vibration and noise performance
online detection
