Identification of inertia tensor of vehicles


Thesis Type: Postgraduate

Institution Of The Thesis: Orta Doğu Teknik Üniversitesi, Graduate School of Natural and Applied Sciences, Graduate School of Natural and Applied Sciences, Turkey

Approval Date: 2007

Student: EMİR KUTLUAY

Supervisor: YAVUZ SAMİM ÜNLÜSOY

Abstract:

The aim of this thesis is to develop a methodology for obtaining mass properties of a vehicle using specific test rig. Investigated mass properties are the mass, location of center of gravity and the inertia tensor. Accurate measurement of mass properties of vehicles is crucial for vehicle dynamics research. The test rig consists of a frame on which the vehicle is fixed and which is suspended from the ceiling of the laboratory using steel cables. Mass and location of center of gravity are measured using the data from the test rig in equilibrium position and basic static equations. Inertia tensor is measured using the data from dynamical response of the system. For this purpose an identification routine which employs prediction error method is developed using the builtin functions from the System Identification Toolbox of MATLAB®. The experiment was also simulated using Simmechanics Toolbox of MATLAB®. Identification code is verified using the results of the experiment simulations for various cases.