Transient Nonlinear Full-Vehicle Vibration Analysis

Paper #:
  • 2017-01-1553

  • 2017-03-28
This paper presents a transient nonlinear vibration analysis of a full-vehicle model. The full-vehicle model consists of a powertrain model, a trimmed body, a drive line, and front and rear suspensions with tires, and is driven by combustion forces and runs on a road surface. The fundamental purpose of the transient nonlinear full-vehicle simulation is to replicate customer’s experience in driving situation in the time domain and to understand real-time phenomena. By performing time-domain simulation, it is possible to capture nonlinear behavior of a vehicle such as preloads due to gravitational force, large deformation, and material nonlinearity which cannot be properly considered in the conventional steady state analysis due to intrinsic linearization process. In constructing a full-vehicle, validation process is essential. Validation process is applied with respect to the assembling sequence. The validation starts with a component level such as mounting bushes, tires, springs, and shock absorbers, and it is followed by system level validation such as front and rear suspensions, and finally full-vehicle level validation is performed. Model validation is done in two aspects; accuracy and efficiency. In the component level, validation is focused more on how to model the component accurately. And later the degree of detailed modeling of each component is compromised with model efficiency by assembling components into systems, and systems into the full-vehicle, because the feasibility of simulation time becomes more critical as the model gets complicated. The transient nonlinear full-vehicle simulation is applied to idle and WOT(Wide Open Throttle) analysis, which can be more effectively performed in the conventional linear steady state analysis, to verify the validity of the transient nonlinear analysis. And then it is applied to lock-up vibration analysis and impact harshness analysis as examples of transient events
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