VIBRATION ANALYSIS OF INTERNAL COMBUSTION PETROL ENGINE BY MATHEMATICAL MODEL

Any motion that repeats itself after an interval of time is vibration. In general, vibration on vehicle engine occurs due to over load, reciprocating unbalanced mass, rough ride, improper maintenance, broken mounts, over speed, faulty timing belt, etc. This results in loosening of chain sprocket, requires frequent maintenance, affects ride behavior of the vehicle and overall performance as well as, it produces noise and transmits vibration to the rider. To investigate this vibration in economical bike engine, a mathematical model of reciprocating unbalanced mass and rough road condition in harmonic manner has been considered. In this method, the equation of motion for the coupled system of piston, connecting rod, crank and suspension system has been derived with two degrees of freedom. Material properties of engine components has been selected for standard bike HERO SPLENDOR PRO. The vibratory response of the engine for various speeds and road conditions have been determined with Matlab Software. From this, response of the system with respect to vibration has been analyzed using different material properties and the vibration parameters are plotted. The better vibration withstanding material combination for the selected bike was found.