Investigation On Modal Transient Response
Analysis Of Engine Crankshaft Structure
Author(s)
M. S. M. Sani, M. M. Noor, M. S. M. Zainury, M. R. M. Rejab,
K. Kadirgama & M. M. Rahman
Abstract
The crankshaft is a very crucial part in an internal combustion engine. This paper
presents the findings of the mode shape and natural frequency of 3 cylinder 4
stroke engine crankshafts. Both experimental and computational methods were
carried out to determine the modal parameter or dynamic characteristics, which
are natural frequency, damping factor and mode shape. The prediction of the
dynamic properties of the chassis is of great significance in determining the
natural frequencies of the structure. The experiment is done by using an impact
hammer to excite the crankshaft and data is recorded using a data acquisition
system (DAS) connected to a sensor located on the crankshaft. Computational
modal analysis on the crankshaft structure is simulated using finite element
software. It can be seen from the results that there is a good agreement between
the experimental and computational results in terms of modal parameter with a
small discrepancy. The modal analysis techniques are essential for automotive
crankshaft structure design.
Keywords: natural frequency, mode shape, modal analysis, crankshaft, finite
element.
1 Introduction
In the Otto cycle engine or Internal Combustion Engine (ICE), a piston, or series
of them, will reciprocate in a linear manner. Crankshaft linear motion needs to be
translated into rotational motion in order for the power to be generated from the
movement of the piston. Natural frequency is the frequency at which a system
naturally vibrates once it has been set into motion. In other words, the natural
Keywords
natural frequency, mode shape, modal analysis, crankshaft, finite
element
Related Book
Other papers in this volume
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