Method for extracting fan vibration characteristics based on cyclostationary method for complex amplitude modulation model

• Main Authors: TANG CHUANQUAN, JIANG HONGTAO, CHU NING, WU DAZHUAN, XU JIANFENG
• Format: Patent
• Language: Chinese; English
• Published: 25.12.2018
• Subjects: BLASTING; CALCULATING; COMPUTING; CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROLLING; COUNTING; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; HANDLING RECORD CARRIERS; HEATING; LIGHTING; MECHANICAL ENGINEERING; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; NON-POSITIVE DISPLACEMENT PUMPS; PHYSICS; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PRESENTATION OF DATA; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; RECOGNITION OF DATA; RECORD CARRIERS; REGULATING; WEAPONS

A method for extracting fan vibration characteristics based on a cyclostationary method for a complex amplitude modulation model comprises the following steps that a vibration acceleration signal of afan is collected through an acceleration sensor; the collected acceleration signal is guided into a to-be-operated procedure, detecting is conducted through a correlation characteristic function based on cyclostationary characteristics, and a cyclic density spectrum is obtained; through priori knowledge of the complex amplitude modulation model of a rotating machine, a three-dimensional cyclic density spectrum and a two-dimensional top view, reducing the amplitude value difference, of the three-dimensional cyclic density spectrum are constructed; the modulation frequency is judged according to the two-dimensional top view, and the carrier frequency is judged according to the three-dimensional cyclic density spectrum; and a simulation signal is built through the obtained modulation frequency and carrier frequency