Abstract
A large number of auxiliary equipment is set up on the shipping system, most of them is rotating machinery and in working state for most of the time, it is very important to identify health condition of equipment to find early damage and avoid fatal failure. Acoustic emission is based on rapid release of energy in case of material deformation or cracking. Auxiliary equipment will continue to emit acoustic signals, which is collected by means of a protable detection device in this paper, parameters like RMS, Peak Factor are calculated to identify health condition in time domain. Through laboratory simulation test and real ship test, the result shows that by comparing the parameters of acoustic emission signal, health condition or its change trend can be obtained, early failure of equipment can be prevented.
Highlights
In order to guarantee normal running states of ship internal systems, auxiliary machinery is set, including reciprocating pump, rotary pump, centrifugal pump, piston air compressor, refrigeration units, most of these auxiliary equipment is running all the time and belong to rotating machinery, providing the needed fresh water, sea water, air source, oil source and so on for other internal system users, once a failure occurs, it may directly affect other system working, or even threaten ship safety if it is not repaired immediately
In view of marine auxiliary machinery characteristics, this paper has presented a method of acoustic emission testing for state detection, through mechanism analysis and test, analyzed the feasibility of acoustic emission testing method
The multi-function flaw detector can collect and store acoustic emission signal, after detection the acquired signal can be deduced by special software on computer for data analysis to computer indicatiors like root mean square value (RMS), peak value (Peak), peak factor (PF), health status can be determined by comparison of the same type of equipment or changing trend
Summary
In order to guarantee normal running states of ship internal systems, auxiliary machinery is set, including reciprocating pump, rotary pump, centrifugal pump, piston air compressor, refrigeration units, most of these auxiliary equipment is running all the time and belong to rotating machinery, providing the needed fresh water, sea water, air source, oil source and so on for other internal system users, once a failure occurs, it may directly affect other system working, or even threaten ship safety if it is not repaired immediately. It is very important to carry out regular inspection and rapid fault identification of auxiliary equipment health status for whole ship normal operation. In view of marine auxiliary machinery characteristics, this paper has presented a method of acoustic emission testing for state detection, through mechanism analysis and test, analyzed the feasibility of acoustic emission testing method
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