Analysis of Random Vibration Response for Nondestructive Testing of Insulator
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摘要: 针对电力系统绝缘子安全检测需要，提出一种基于随机振动响应谐振频率偏移的绝缘子无损检测方法。利用Abaqus有限元仿真软件，进行了绝缘子振动模态和随机振动响应分析。根据支柱陶瓷绝缘子断裂位置多发生在其上下法兰附近的实际情况，对无缺陷绝缘子和上、下法兰区有裂纹绝缘子的随机振动响应进行了数值仿真和检测试验研究。结果表明，可以通过绝缘子随机振动响应的谐振频率偏移进行绝缘子无损检测，即上部法兰区的裂纹会导致谐振频率向高频偏移，而底部法兰区的裂纹会导致谐振频率向低频段偏移。在此基础上，通过数值仿真研究了裂纹深度对谐振频率偏移的影响。Abstract: For safety evaluation of insulators in power system, a nondestructive testing method based on the random vibration response analysis is proposed. The vibration modes and random vibration response of insulator are investigated in Finite Element software of Abaqus. According to the actual fracture location of the pillar ceramic insulator, the upper and lower flange, the numerical simulation and experimental tests are conducted on insulators with cracks. It is shown that the offset of resonant frequency in random vibration response can be used as indicator for the nondestructive evaluation of insulator. If there are cracks in upper flange, the resonant frequency will shift to higher frequency; if there are cracks in lower flange, the resonant frequency will shift to lower frequency. Moreover, the influence of crack depth on the shift of resonant frequency is investigated.
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