Abstract：

Simulates nine common faults of singlescrew chillers. Considers the suction temperature and exhaust temperature of the compressor as characteristic parameters, decomposes and reconstructs the characteristic parameters by waveletpacket analysis method, extracts the signals of fault characters, and establishes the relationship between characteristic vector and system state.

Keywords:singlescrewchiller,waveletpacketanalysis,faultdiagnosis,characteristicparameter,diagnosticprincipl