3315. A New Test Rig for the Identification of the Inertia Tensor of a Rigid Body

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Title3315. A New Test Rig for the Identification of the Inertia Tensor of a Rigid Body
Publication TypeConference Paper
Paper Number3315
Year of Publication2003
AuthorsMastinu, Gobbi, and Previati Giorgio
Conference62nd Annual Conference, New Haven, Connecticut
Conference LocationNew Haven, Connecticut
PublisherSociety of Allied Weight Engineers, Inc.
Date Published5/17/03

A new method for measuring the inertia tensor of rigid bodies has been developed and applied. A new test-rig, based on the developed method, has been built. The test-rig is basically a three- or four-bar pendulum, carrying the rigid body under investigation. The pendulum is excited either by well defined initial conditions or by a harmonic force. The spatial motion of the pendulum is highly non linear and is recorded by means of accelerometers and gyroscopes. The components of the inertia tensor are identified by a proper numerical procedure which makes use of a mathematical model describing the motion of the pendulum. A proof of the convergence of the identification procedure is given. A validation of the measuring procedure is presented. The maximum error on the main diagonal components of the inertia tensor is less than 0.7%. Further improvements on the precision of the measurement procedure are possible. The rig has been used to measure the inertia tensor of a number of road vehicles and other bodies.

Key Words06. Inertia Measurements
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