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Use of audible sound for non-destructive testing in mechanical engineering [Elektronski vir]
Čudina, Mirko
In mechanical engineering there are different phenomena, which have to be tested and monitored to control undesirable effects. Where these phenomena are connected with the emitted noise like in power ...and process engineering, and working and machinetools, audible sound is very useful tool for non-destructive testing and monitoring. In this paper, our findings connected with transient phenomena, will be presented. The use of audible sound will be demonstrated: - in detection of rotating stall and surge at axial and centrifugal turbo machines (fans, compressors and pumps), - in detection of the cavitation process in centrifugal pumps and for determination of the net positive suction head (NPSH) critical value and - in quality control of the gas metal arc welding (GMAW) process. In this paper, all these phenomena are also theoretical demonstrated. In comparison with other methods, the method based on the use of audible sound is cheap, easy and userfriendly. Instead of a special test stand or boring a hole in the machine wall to mount a sensor, only a microphone placed nearby and a computer with a sound card are needed.
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