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MODAL ANALYSIS OF A MOTORBIKE
Ajay G. Malayil* and Ramesh Kumar R.
Dynamic response of a 350cc bike having tubular chassis out of AISI 4130 alloy steel is studied considering the actual geometric data and stiffness distribution with engine and passenger masses and replacing spring mass system for the wheel and tire assembly. The fundamental frequency of the bike is observed as 12.7Hz and comparison with the reported frequency when structural mass alone is considered for 150cc bike is seen in the expected range. Fixity of engine mounting brackets makes the design insensitive with the wheel assembly. Under gravitational load the induced stresses are much lower as expected with a margin of safety of three with respect to the endurance limit value of the alloy steel. Structural elements that possess low frequency have been identified. Participating mass of the engine for respective mode shapes shows that engine mass location is quite safe and ideal.[Full Text Article]