Propagation mechanism of acoustic emission signal in the casing mounting edge

As a monitoring technology for initial faults, acoustic emission (AE) has been widely used. In complex mechanical equipment, the mounting edge structure is ubiquitous. It is the only way which must be passed for AE signal to transmit to the sensor. It affects the propagation of AE signals of initial faults. In this paper, the propagation characteristics of AE signal in the mounting edge structure are studied by numerical simulations and experiments. Firstly, this paper designs the ring model without bolt holes and the ring model with bolt holes. The variation trend of time domain characteristics such as signal energy and amplitude in the propagation process is analyzed. The effects of bolt holes on AE signal attenuation, reflection and mode conversion are studied. Secondly, the corresponding double -layer model is designed. It is used to study the effect of the connection interface at the mounting edge on the AE signal. Finally, the simulation results are verified by experiments. This paper reveals the propagation characteristics of AE signal in the mounting edge structure. It lays a foundation for the subsequent signal processing.