高阶固有频率检测评估旧零件疲劳损伤的研究

发布时间：2018-01-23 05:10

本文关键词： 再制造旧零件声振传感器高阶固有频率疲劳损伤检测　出处：《广西大学学报(自然科学版)》2017年03期 　论文类型：期刊论文

【摘要】：针对再制造工程中旧零件内部疲劳损伤难以检测的问题,尝试运用高阶固有频率对疲劳损伤的敏感性来检测评估旧零件疲劳损伤,并进行了试验研究。首先,通过ANSYS模拟分析,从理论上论证,高阶固有频率比低阶固有频率能更敏感地反应损伤变化、检测损伤;然后,采用自主研发的双通道高灵敏声振检测仪构建了高阶固有频率测量方法,固有频率的实测值与理论计算值的误差均小于3%,表明测量方法具有较高精度;预置裂纹和经过疲劳试验试件的高阶固有频率值,对裂纹(裂纹率8.3%~33.3%)和疲劳试验时间6~30 h试件均有不同的变化,表明高阶固有频率可以检测评估疲劳损伤;最后,在再制造工厂对一批连杆体旧零件进行高阶固有频率测试,发现在役使用时间仅有41 h旧零件的高阶固有频率已有明显变化,表明高阶固有频率对旧零件疲劳损伤很敏感,将会是再制造旧零件无损检测的新途径。
[Abstract]:In order to solve the problem that the internal fatigue damage of old parts is difficult to detect in remanufacturing engineering, the sensitivity of high order natural frequency to fatigue damage is used to detect and evaluate the fatigue damage of old parts. Through ANSYS simulation and analysis, it is theoretically proved that higher order natural frequency can more sensitively reflect damage change than lower order natural frequency and detect damage. Then, the high-order natural frequency measurement method is constructed by using the self-developed dual-channel highly sensitive acoustic vibration detector. The error between the measured value and the theoretical calculation value of the natural frequency is less than 3%. It shows that the measurement method has high accuracy. The high order natural frequency values of pre-crack and fatigue test specimen have different changes for crack (crack rate 8.3 ~ 33.3) and fatigue test time of 630 h. It shows that high order natural frequency can be used to detect and evaluate fatigue damage. Finally, the high order natural frequencies of a batch of old connecting rod parts are tested in the remanufacturing plant. It is found that the high order natural frequencies of the old parts with only 41 hours in service have changed obviously. It is shown that high order natural frequency is sensitive to fatigue damage of old parts and will be a new way of nondestructive testing for remanufacturing old parts.
【作者单位】：广西大学机械工程学院;电子科技大学机电工程学院;广西科技大学汽车与交通学院;
【基金】：国家自然科学基金资助项目(51365006,51445013) 广西制造系统与先进制造技术重点实验室课题(14-045-15S05)项目
【分类号】：TH114
【正文快照】： 0引言为保证再制造零件质量,除了对旧零件的普通探伤检测并进行尺寸修复外,还应该对其内部的微裂纹或疲劳状况进行评估检测[1-2]。利用结构的振动响应和系统动态特性对结构内部微损伤进行无损诊断是当前研究的热点,马少花等[3]利用振动测试方法提取系统非线性特征,构建敏感故

【共引文献】