A series of NVH experiments were performed for a set of single cylinder engine models made of aluminum, consisting of a cylinder head, a cylinder block and a bed-plate. Each has the same outer size of 150mm × 150mm; the different heights are 100mm, 200mm and 80mm respectively. Those dimensions were determined following the dimensions for a diesel engine in lightweight commercial vehicle with the bore size of 100mm and the crankshaft main bearing diameter of 60mm.We chose 112 of measuring points on the structure surfaces and performed a series of impact tests, for the following cases: By measurement the accelerations of the structure surfaces, the transfer functions and the mode shapes were defined successfully. Furthermore, we found significant differences for the case (b) compared to the case (a), We investigated carefully the changes in the mode shapes for the two cases. Thus we found some reasons for the above differences and the merit of the through-bolts fastening.
NVH Experimental Analyses for an Engine Structure Model Assembled with Ordinary Tap Bolts and with Through Bolts
Sae Technical Papers
SAE 2003 Noise & Vibration Conference and Exhibition ; 2003
2003-05-05
Aufsatz (Konferenz)
Englisch
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