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应广大读者的要求，本刊从本期起连续刊登有关工程机械故障诊断理论与实践的文章。计划用１２讲完成，每期一讲。特聘上海交通大学机械设备诊断中心佟德纯教授主讲。内容包括：诊断原理、相关关系与故障定位、振动诊断仪表、现场诊断方法、油料分析与状态 监测、红外测温技术、无损检测、智能诊断系统以及相关的诊断实例。读者有何要求，请随时与 编辑部联系。工程机械诊断技术是一门了解和掌握机械设备运行过程中的状态，进而确定其全体或局部是否正常，以便早期发现故障，早期查明原因并能预报故障发展趋势的技术。
At the request of readers, this issue from this issue continuously published articles about the theory and practice of construction machinery fault diagnosis. Plan to finish with 12, each speak. Distinguished Professor Tong Dechun, Mechanical Equipment Diagnostic Center, Shanghai Jiao Tong University. The contents include: diagnosis principle, correlation and fault location, vibration diagnosis instrument, on-site diagnosis method, oil analysis and status monitoring, infrared temperature measurement technology, nondestructive testing, intelligent diagnosis system and related diagnostic examples. Readers, please feel free to contact the editorial department. Construction machinery diagnostic technology is a technology to understand and master the status of machinery and equipment during operation, and then determine whether all or part of its normal in order to early detection of faults, early detection of the cause of failure and forecasting trends.