Title: Finite element analysis for engine crankshaft torsional stiffness

Authors: Rang-Lin Fan; Chu-Yuan Zhang; Fang Yin; Cheng-Cheng Feng; Zhen-Dong Ma; Hua-Bing Gong

Addresses: School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China ' School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China ' School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China ' School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China ' School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China ' ASIMCO NVH Technologies Co., Ltd., Anhui 242344, China

Abstract: Accurate crankshaft torsional stiffness is important to build the lumped parameter model (LPM) for crankshaft torsional vibration analysis. For the crankshaft system of a four-cylinder in-line gasoline engine, a procedure to build the finite element model (FEM) is presented. And the applicability of two ways to set the equivalent mass or equivalent moment of inertia for piston-rod in FEM is declared. When building a lumped parameter model, the concept of rigid-rotation of the crank pin central section around the central line of the crankshaft is proposed, and a method to obtain the torsional angle of the central section is declared. What is more, three post-processing methods are presented to obtain the torsional stiffness coefficients. According to three load cases of no-load, half load and full load, the tests are carried out. The simulation results of FEM and LPM, and the test results have good agreement with each other.

Keywords: engine; crankshaft; torsional vibration; torsional stiffness; rigid-rotation; finite element analysis; finite element model; lumped parameter model; crankshaft torsional absorber; modal analysis.

DOI: 10.1504/IJSPM.2019.103590

International Journal of Simulation and Process Modelling, 2019 Vol.14 No.4, pp.389 - 396

Received: 19 Sep 2018
Accepted: 11 Apr 2019
Published online: 12 Nov 2019 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article