Thermodynamic and Dynamic Analysis of Four-Cylinder Crankshaft

In this paper, dynamic analysis of four-cylinder crankshaft has been studied using theoretical and numerical methods. Crankshaft is large volume production component with a complex geometry in the Internal Combustion (I.C) Engine. This converts the reciprocating displacement of the piston into a rotary motion of the crank. The objective of this paper is to analyze the kinematics and dynamics of the crankshaft and compare the theoretical with Solidworks Motion results. Kinematics is the study of motion without regard for the forces that cause the motion. A kinematic analysis is conducted before dynamic behavior of the mechanism can be simulated properly. Dynamic analysis is the study of motion in response to externally applied loads. The dynamic behavior of a mechanism is governed by Newton’s second laws of motion. The main target of dynamics analysis is to compute the values of inertia forces. The calculated values and the simulation results of inertia forces are nearly the same. The maximum percentage error is less than 20 %. Moreover, the output torque of engine at 2000 rpm is nearly 180 N-m. The manufacturer specification data for output torque at 2000 rpm is 192 N-m. So, the deviation between simulation result and manufacturer specification data is 6.25 %. The kinematic parameter of the mechanism are: the linear displacements, the linear velocity and the linear acceleration of the piston.