Title: Identification of the rigid body characteristics of a power plant by using experimentally obtained transfer functions

Authors: Hiroshi Okuzumi

Addresses: Central Engineering Laboratories, Nissan Motor Co. Ltd., 1 Natsushima-cho, Yokosuka-shi, Kanagawa-ken 237, Japan

Abstract: Accurate data on the rigid body characteristics of a powerplant, including its centre of gravity and principal moments of inertia, are necessary in designing the characteristics of engine mounting systems. This paper presents a method for identifying the rigid body characteristics of a powerplant by solving a set of simultaneous linear equations. These equations are derived from an equation of motion, F = M*{¨X}, where {¨X} is an excitation force vector, is an acceleration vector obtained experimentally and M is a 6 × 6 rigid body matrix of unknown quantities. A modal curve fitting method is used to eliminate the unwanted effects of higher-frequency elastic vibration modes from the rigid body motion frequency region of the measured transfer functions. The identification results for a front-wheel-drive powerplant were verified by comparing the actual and identified masses and the measured and calculated inertance levels.

Keywords: power plants; rigid body characteristics; transfer functions; simultaneous linear equations; modal curve fitting; elastic vibration; motion frequency; identification; front wheel drive; vehicle design.

DOI: 10.1504/IJVD.1994.061873

International Journal of Vehicle Design, 1994 Vol.15 No.3/4/5, pp.425 - 434

Available online: 28 May 2014 *

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