This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Comparison between Finite Element and Hybrid Finite Element Results to Test Data for the Vibration of a Production Car Body
Technical Paper
2019-01-1530
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The Hybrid Finite Element Analysis (HFEA) method is based on combining conventional Finite Element Analysis (FEA) with analytical solutions and energy methods for mid-frequency computations. The method is appropriate for computing the vibration of structures which are comprised by stiff load bearing components and flexible panels attached to them; and for considering structure-borne loadings with the excitations applied on the load bearing members. In such situations, the difficulty in using conventional FEA at higher frequencies originates from requiring a very large number of elements in order to capture the flexible wavelength of the panel members which are present in a structure. In the HFEA the conventional FEA model is modified by de-activating the bending behavior of the flexible panels in the FEA computations and introducing instead a large number of dynamic impedance elements for representing the omitted bending behavior of the panels. The excitation is considered to be applied on the conventional FEA model and the vibration analysis is conducted using the FEA. The power flow through the dynamic impedance elements is computed, and in this work it is used to assess the vibration of the flexible panels. Successful comparisons between test data and HFEA results have been presented in the past for car body structures and for a rotorcraft application. In this paper a three-way comparison is presented for the vibration of a production vehicle body in the frequency range 200Hz - 1,000Hz. Six different excitation locations on the stiff parts of the structure are utilized (one at a time); for each excitation the mobility of five reference body points on the load bearing members, and the mobility of seven flexible vehicle panels is measured and the measurements are compared with both conventional FEA results and with HFEA computations. The conventional FEA model which is used in this work for the respective computations is a production FEA vehicle model with sufficient refinement in order to be valid up to 1,000Hz based on a requirement of exhibiting at least six elements per wavelength at the highest frequency of interest. The FEA model had been validated in the past through comparison with modal test data in low frequencies. Discussion about the development of the HFEA model and the correlation of both numerical solutions to the test data are presented in this paper.
Recommended Content
Authors
Citation
Vlahopoulos, N., Sander, D., Lee, S., Böhler, E. et al., "Comparison between Finite Element and Hybrid Finite Element Results to Test Data for the Vibration of a Production Car Body," SAE Technical Paper 2019-01-1530, 2019, https://doi.org/10.4271/2019-01-1530.Also In
References
- Tan , Y.-C. , Castanier , M.P. , and Pierre , C. Power Flow Analysis of Complex Structures Using Characteristic Constraint Modes AIAA Journal 43 6 June 2005
- Zhang , G. , Castanier , M.P. , and Pierre , C. Integration of Component-Based and Parametric Reduced-Order Modeling Methods for Probabilistic Vibration Analysis and Design Proceedings of the Sixth European Conference on Structural Dynamics Paris, France Sep. 2005
- Zhang , G. , Castanier , M.P. , and Pierre , C. Efficient Component Mode Synthesis with a New Interface Reduction Method Proceedings of IMAC-XXII: A Conference & Exposition on Structural Dynamics Dearborn, MI Jan. 2004
- Zhang , G. , Castanier , M.P. , Pierre , C. , and Mourelatos , Z.P. Vibration and Power Flow Analysis of a Vehicle Structure Using Characteristic Constraint Modes SAE Technical Paper 2003-01-1602 May 2003 2003 10.4271/2003-01-1602
- Avery , P. , Farhat , C. , and Reese , G. Fast Frequency Sweep Computations Using a Multi-Point Padé-Based Reconstruction Method and an Efficient Iterative Solver International Journal for Numerical Methods in Engineering 69 13 2848 2875
- Bremner , P. and Langley , R. An Energy Method for Mid-Frequency and Low Modal Overlap The Journal of the Acoustical Society of America 100 4 2754 1996
- Langley , R.S. and Bremner , P. A Hybrid Method for the Vibration Analysis of Complex Structural-Acoustic Systems Journal of the Acoustical Society of America 105 1657 1671 1999
- Cotoni , V. , Shorter , R. , and Langley , R. Numerical and Experimental Validation of a Hybrid Finite Element - Statistical Energy Analysis Method J. Acoust. Soc. Am. 122 1 259 270 2007
- Charpentier , A. , Sreedhar , P. , and Fukui , K. Using the Hybrid FE-SEA Method to Predict Structure-Borne Noise Transmission in a Trimmed Automotive Vehicle SAE Technical Paper 2007-01-2181 2007 10.4271/2007-01-2181
- Nakamura , K. , Oki , H. , Sanui , R. , Kinoshita , Y. et al. Investigation of Soot Oxidation Carried out on Membrane Filters Composed of SiC Nanoparticles SAE Int. J. Engines 9 1 297 304 2016 10.4271/2015-01-2015
- Vlahopoulos , N. and Zhao , X. A Basic Development of a Hybrid Finite Element Method for Mid-Frequency Computations of Structural Vibrations AIAA Journal 37 11 1495 1505 Nov. 1999
- Zhao , X. and Vlahopoulos , N. A Basic Hybrid Finite Element Formulation for Mid-Frequency Analysis of Beams Connected at an Arbitrary Angle Journal of Sound and Vibration 269 6 135 164 Jan. 2004
- Hong , S.B. , Wang , A. , and Vlahopoulos , N. A Hybrid Finite Element Formulation for a Beam Plate System Journal of Sound and Vibration 298 233 256 2006
- Hong , S.B. and Vlahopoulos , N. A Hybrid Finite Element Formulation for Analyzing the Structure-Borne Noise in a Body-in-White SAE Technical Paper 2005-01-2421 2005 10.4271/2005-01-2421
- Vlahopoulos , N. , Li , S. , Victorovitch , M. , and Caprioli , D. Validation of a Hybrid Finite Element Formulation for Mid-Frequency Analysis of Vehicle Structures SAE Technical Paper 2007-01-2303 2007 10.4271/2007-01-2303
- Sbragio , R. , Wang , A. , Vlahopoulos , N. , Caprioli , D. , and Bertolini , C. Structure-Borne Vehicle Analysis Using a Hybrid Finite Element Method SAE Technical Paper 2009-01-2196 2009 10.4271/2009-01-2196
- Vlahopoulos , N. , Lee , S. , Braunwart , P. , Mendoza , J. et al. Hybrid Finite Element Analysis of a Rotorcraft SAE Int. J. Aerosp. 6 1 2013 10.4271/2013-01-1995
- Craig , R.R. and Bampton , M.C.C. Coupling of Substructures for Dynamic Analysis American Institute of Aeronautics and Astronautics Journal 6 1313 1319 1968
- Palmonella , M. , Friswell , M.I. , Mottershead , J.E. , and Lees , A.W. Finite Element Models of Spot Welds in Structural Dynamics: Review and Updating Computers & Structures 83 8-9 648 661 2005
- MacNeal , R. 1972
- MacNeal , R. A Simple Quadrilateral Shell Element Computers & Structures 8 175 183 1978
- Kompella , M.S. and Bernhard , R.J. Measurement of the Statistical Variation of Structural-Acoustic Characteristics of Automotive Vehicles SAE Technical Paper 931272 1993 10.4271/931272
- Vlahopoulos , N. , Zhang , G. , Brophy , W. , and Ramaswami , M. Vehicle Airborne Noise Analysis Using the Energy Finite Element Method SAE Technical Paper 2013-01-1998 2013 10.4271/2013-01-1998