Simple Modeling and Analysis for Crankshaft Three-Dimensional Vibrations, Part 1: Background and Application to Free Vibrations

[+] Author and Article Information
H. Okamura

Department of Mechanical Engineering, Sophia University, 7-1, Kioicho, Chiyoda-Ku, Tokyo, Japan

A. Shinno

Mitsubishi Heavy Industries, Ltd., Tokyo, Japan

T. Yamanaka

Ricoh, Ltd., Kawasaki, Japan

A. Suzuki

Sony, Ltd., Tokyo, Japan

K. Sogabe

Department of Mechanical Engineering, Sophia University, Tokyo, Japan

J. Vib. Acoust 117(1), 70-79 (Jan 01, 1995) (10 pages) doi:10.1115/1.2873869 History: Received January 01, 1993; Revised September 01, 1993; Online February 26, 2008


To simplify the analysis of the three-dimensional vibrations of automobile engine crankshafts under firing conditions, the crankshaft was idealized by a set of jointed structures consisting of simple round rods and simple beam blocks of rectangular cross-section. The front pulley, timing gear, and the fly-wheel were idealized by a set of masses and moments of inertia. The main journal bearings were idealized by a set of linear springs and dash-pots. For each constituent member, the dynamic stiffness matrix was derived (in closed form) from the transfer matrix. Then the dynamic stiffness matrix for the total crankshaft system was constructed, and the natural frequencies and mode shapes were calculated. The modeling and analysis procedures were applied to the analysis of free vibrations of four kinds of crankshafts: single cylinder, three-cylinder in-line, four-cylinder in-line, and V-six engines. The different coupling behavior of the three-dimensional vibrations in the planar-structure and the solid-structure crankshaft is discussed, and the influence of the bearing oil film stiffness on the crankshaft natural frequency is also analyzed.

Copyright © 1995 by The American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.







Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In