Samand car is one of the most circulation car in Iran and its engine is known as a national engine of Iran. So keeping it updated and optimized contain of high importance. One of the important issues in internal combustion piston engines that can be seen, is vibrations of the engine components that is applied by the forces and moments. Since the crankshaft is one of the main parts of the engine, crankshaft vibration analysis in this study has been studied.
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