Identification of the rigid body characteristics of a power plant by using experimentally obtained transfer functions Online publication date: Wed, 28-May-2014
by Hiroshi Okuzumi
International Journal of Vehicle Design (IJVD), Vol. 15, No. 3/4/5, 1994
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.
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