Abstract
When designing and manufacturing the engine in general and diesel engines in particular, one thing can not be ignored is calculating the stresses in crankshaft of engines. It decides the life of the designed engine. There are many methods of calculating the stresses in crank shaft based on elasticity theory, Hook laws. The article refers to an approach to solution of problems on applications by finite element method through global professional software of U.S. is ANSYS. The problem to calculate the stresses in crankshaft of diesel engines presented in this article is divided into two parts: the first part is calculating the torsional vibrations occurred when the engine works and the second part is identifying maximum stress when engine working in resonant turning circles. The engine was selected to calculate the stresses are a diesel engine one-line with 6 cylinders model D1146TIS by VEAM (Vietnam Engine and Agricultural Machinery Corporation) research to design, manufacturing in Vietnam. The main content is presented in the article: creating crank mechanisms 3D model of the engine D1146TIS, to calculate torsional vibration of crank mechanisms, to calculate the stresses in crankshaft at resonant turning circles (resonant spins) with 2 options for crankshaft was made of steel and cast-iron. Using the calculation results achieved, the authors propose option for drilling holes on the crank pins with the reasonable diameter in order to have a maximum stress on the crankshaft at resonant turning circles is the smallest.
Keywords: Finite Element Method, Finite Element Model, Crankshaft, Torsional Vibration, Beam Mass Model - BMM, Solid Finite Model – SFEM, Crankweb, Crank Mechanims, Resonance, Torsional Damper.