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Advanced FRF Based Determination of Structural Inertia Properties
Technical Paper
2007-01-2329
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Accurate estimation of inertia properties is crucial in the design and development cycle of mechanical structures. When modeling complex structures and subassemblies, or simulating the dynamics of mechanisms, the rigid body characteristics of a subassembly might be too complex or inaccurate to calculate. Traditionally, inertia properties are obtained by a laborious pendulum test, a very time consuming procedure. A highly accurate alternative is to perform a typical modal test, inertia properties are than achieved based on frequency response function and its mass line characteristic. This paper explains, first of all, how to extract inertia properties such as center of gravity, moments and principal axes of inertia based on frequency response functions (FRF's), and then how to synthesize rigid body characteristics such as rigid body modes with respect to the geometry and the resulted inertia properties. Both an academic case and real-life applications are used to validate the approach. Moreover, different aspects such as measurement setup, influence of number of responses and references on the accuracy are also discussed in this paper.
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Citation
Lau, J. and Deblauwe, F., "Advanced FRF Based Determination of Structural Inertia Properties," SAE Technical Paper 2007-01-2329, 2007, https://doi.org/10.4271/2007-01-2329.Also In
References
- Toivola J. Nuutila O. “Comparison of three methods for determining rigid body inertia properties from frequency response functions” Tampere University of Technology P.O. Box 589, SF-33101 Tampere, Finland
- LMS international “How to add rigid body modes to an existing modal model in CADA-X” LMS international consulting reports Leuven, Belgium 1991
- Okuzumi H. “Identification of the rigid body characteristics of a powerplant by using experimental obtained transfer functions” Central engineering laboratories Nissan motor Co., Ltd. June 1991
- Leurs W. Gielen L. Burghmans M. Dierckx B. “Calculation of rigid body properties from FRF data: practical implementation and test cases” Proc. of the 15 th International Modal Analysis Conference Tokyo, Japan 1997
- LMS international LMS Test.Lab Modal Analysis - Modal Rigid Body Manual LMS international Leuven, Belgium 2006
- LMS international “Measuring rigid body properties of an exhaust system: A comparative analysis” LMS international Leuven, Belgium 1998
- Madjlesi R. Khajepour A. Ismail F. Wybenga M. Rice B. Mihalic J. “Optimization of engine mounting systems using experimental FRF vehicle model” Int. J. Vehicle Noise and Vibration 1 ¾ 2005