Experimental Research On Shafting Crack Fault Diagnosis

The paper introduced the current research tendency of diesel engine shafting crack fault diagnosis, and described the importance and necessity of diesel engine shafting crack fault diagnosis research. It explained the algorithm of diesel engine torsion vibration, the dynamics of torsion fatigue crack, torsion vibration testing and analyzing methods.The paper programmed progressive integral calculation by Matlab software, and performed mathematical simulation and frequency domain wave analysis for tester.The paper applied the parallel-sliding-board type torsion vibration exciter to shafting tester, and performed contrast test between good shafting and cracked shafting, in order to make good foundation for further research work for diesel engine torsion vibration fault diagnosis.It firstly have developed small shafting torsion vibration tester which had variable exciting frequency and duty ratio. The paper calculated main vibration parameters. The contrast test between with cracked shafting and non-cracked shafting could be performed on the tester.The paper fulfilled shafting torsion vibration test with cracked shafting and with non-cracked shafting on variable exciting shafting tester. The results have shown that the exciting source has played the role of simulating diesel engine excitation, so the change of cracked shafting stiffness has responded. The torsion vibration signal characteristic for diesel engine shafting crack trouble shooting was acquired by experimental result and analysis.