Abstract: In high-speed diesel engine the problem of torsional vibration of the crankshaft has become critical with increase in excitation forces. This results in high torsional vibration amplitudes and hence high stresses .This paper aims at complete FEM analysis of a crankshaft for torsional and bending vibrations & identification of stresses. It is analyzed for natural frequency, rigid body mode shape by ANSYS. . The complete simulation of actual boundary conditions is done for journal bearing support, inertia lumping for reciprocating parts and bearing stiffness. ANSYS-programme, which will convert user input Pressure-Crank angle variation to excitation forces for various orders through FFT. The dynamic responses obtained for displacement and stresses. Finally all results are combined to obtain the variation of Fillet Stress as a function of engine speed and harmonic orders. The critical dynamic response is compared with results obtained experimentally for torsional amplitudes. The parametric optimization has been done to increase the frequency it means the higher the frequency higher the stiffness or strength with optimum weight of the component.
Keywords: Torsional vibration, Bending vibration, Modal analysis, Rigid body modes, Static analysis, Critical fillet stresses, , FFT setup.
Title: Finite Element Approach for Study of Torsional and Bending Effect on Four Cylinder Engine Crankshafts
Author: P.D.Shah, Prof. K.K.Bhabhor
International Journal of Thesis Projects and Dissertations (IJTPD)
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