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Development of a PC-Based Software for Analysis of Off-Road Vehicle Seat Suspensions
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 01, 1994 by SAE International in United States
Annotation ability available
Dynamic analysis of vertical seat suspensions of off-road vehicles is performed via computer simulation models in order to establish their ride performance. The PC-based computer simulation program is capable of analyzing various commercially available seat suspensions under different input excitations. The software is developed using the Visual Basic interface on Microsoft Windows platform and is entirely menu driven. The software is organized in a systematic fashion with the pre-processor, analysis and post-processing modules and has the option to choose any module from the initial selection screen. A database of various seat-suspension characteristics, along with other off-road vehicle input parameters is available in the pre-processor module. Analysis of the dynamic system is performed using a generalized two-degree of freedom model characterizing the vertical seat and suspension motion. The model incorporates the system nonlinearities due to shock absorber damping, coulomb friction and bump stops. The nonlinearities in the model are linearized using a local equivalent linearization technique based on energy similarity in order to compute the ride performance of the seat-suspension system. The base excitations from the cab floor on the seat-suspension system include both deterministic (sinusoidal and shock) and random input conditions. The post-processing module graphically presents the vibration attenuation characteristics of the seat-suspension in terms of the following performance criteria: (a) acceleration transmissibility and (b) Power Spectral Density (PSD) of acceleration response for the random input.
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CitationRanganathan, R. and Sriram, K., "Development of a PC-Based Software for Analysis of Off-Road Vehicle Seat Suspensions," SAE Technical Paper 941677, 1994, https://doi.org/10.4271/941677.
- Stikeleather, L.F. “Review of Ride Vibrations Standards and Tolerance Criteria” Trans. SAE 85 1460 1467 1976
- Claar P.W. II. Buchele, W.F Sheth, P.N. “Off-Road Vehicle Ride: Review of Concepts and Design Evaluation with Computer Simulation” SAE Paper No. 801023 1980
- Rosegger, R. Rosegger, S. “Health Effects of Tractor Driving” J. of Agric. Eng. 5 3 242 1960
- Mathews, J. “Ride Comfort for Tractor Operators, Review of Existing Information” J. of Agric. Eng. 9 1 3 31 1964
- International Standard Organization ISO-2631/1. “Evaluation of Human Exposure to Whole Body Vibration” Part 1: General Requirements 1985
- SAE J1384 “Classification of Agricultural Wheeled Tractors for Vibration Tests of Operator Seats” SAE Hand Book 40.334 40.335 1988
- Rakheja, S. Sankar, S. “Improved Off-Road Tractor Ride Via Passive Cab and Seat Suspension” Trans. ASME J. of Vibration, Aco. Stress and Reli. in Design 106 2 305 313 1984
- Thompson, W.T. “Theory of Vibrations with Applications” Fourth Prentice Hall 1993
- Su, H. Rakheja, S. Sankar, T.S. “Response of a Non linear Vehicle Suspension with Tunable Shock Absorber to Random Road Excitation.” Diagnostic, Vehicle Dynamics and Special Topics ASME Pub. DE 18-5 12th Biennial ASME Conference on Mechanical Noise and Vibration Montreal September 1989 185 194
- Afework, Y. “An Analytical and Experimental Study of Driver-Seat-Suspension Systems” M.A.Sc., Thesis Concordia University Montreal, Canada