诊断和分析工具提供经济数据和报告的基础上的机械状况，性能和振动的工业往复发动机，压缩机，和旋转设备。
Diagnostic and analysis tools provide economic data and reports based on the mechanical condition, performance and vibration of industrial reciprocating engines, compressors, and rotating equipment.
给出了用于发动机诊断的状态监测参数和性能评估参数；
Parameters of health monitoring and performance assessing have been given to diagnose engine.
并以此为基础运用气路分析原理，选取表征发动机性能参数变化的症兆变量和测量参数，建立了发动机故障诊断小偏差方程。
A fault diagnosis equation for the twin-spool mixed flow turbofan engine was established based on the simulation and gas path analysis.
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