The full vector envelope technique based on LMD(Local Mean Decomposition) is proposed to more accurately extract the vibration fault information of TRT(Top gas pressure Recovery Turbine unit),which acquires two mutually perpendicular signals from a section of TRT rotor,applies LMD to decompose each signal into multiple PF(Product Function) components,fuses the PF envelope functions of two signals to get a full vector envelope spectrum for each PF component,and diagnoses the TRT vibration faults accordingly....