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SAE International Journal of Vehicle Dynamics Stability and NVH
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ERRATA: Bifurcation Analysis of a Car Model Running on an Even Surface - A Fundamental Study for Addressing Automomous Vehicle Dynamics

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Politecnico di Milano-Giampiero Mastinu, Fabio Della Rossa, Massimiliano Gobbi, Giorgio Previati
  • Journal Article
  • 2017-01-1589.01
Published 2017-03-28 by SAE International in United States
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Friction Model for Real-Time Simulation of Powertrain Dynamics

SAE International Journal of Vehicle Dynamics, Stability, and NVH

China Automotive Technology & Research Center-Liang Xu
Jilin University-Hsin Guan, Haiyan Song, Pingping Lu
  • Journal Article
  • 10-02-01-0003
Published 2018-05-22 by SAE International in United States
Clutch friction modeling in powertrain system is the key to realize the real-time and accurate simulation of the powertrain system, and it will have a significant effect on the accurate simulation of the nonlinear characteristics of the powertrain system. Friction models can be divided into two categories: discontinuous friction models and continuous friction models. The approach of dealing with zero velocity discontinuity will affect the numerical stability of the real-time simulation in the discontinuous friction models. The smaller simulation step usually required by continuous friction models will reduce the efficiency of the simulation. Therefore, how to establish and select the friction model is one of the difficulties in the powertrain system modeling. In this article, with the standard of high computational efficiency and numerical stability, simulation research on typical friction model used in real time simulation has been done. At the same time, some friction models of them are improved. A real-time simulation model of the powertrain system is established and the selected friction models are applied to the clutch modeling. The simulation results show…
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Explanation for Variability in Lower Frequency Structure-Borne Noise and Vibration: Roles of Rear Subframe Dynamics and Right-Left Spindle Phasing

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Bruel and Kjaer-Revathi Rengarajan
Ohio State University-Scott Noll, Rajendra Singh
  • Journal Article
  • 10-02-01-0002
Published 2018-05-17 by SAE International in United States
This investigation focuses on a class of rear suspension systems that contain both direct and intersecting structural paths from the tire contact patches to the vehicle body. The structural paths intersect through a dynamically active rear subframe structure. New experiments and computational models are developed and analyzed in this article to investigate the variability of structure-borne noise and vibration due to tire/road interactions in the lower- to mid-frequency regimes. Controlled operational experiments are conducted with a mass-production minivan on a chassis dynamometer equipped with rough road shells. Unlike prior literature, the controlled experiments are analyzed for run-run variations in the structure-borne noise up to 300 Hz in a single vehicle to evaluate the nature of excitations at the spindle as the key source of variation in the absence of significant manufacturing, assembly and instrumentation errors. Further, a deterministic modal expansion approach is used to examine these variations. Accordingly, an illustrative eleven-degree-of-freedom lumped parameter half vehicle model is developed and analytically utilized to demonstrate that left-right spindle excitation phasing dictates the participation of the subsystem vibrational modes…
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In-Plane Flexible Ring Tire Model Parameter Identification: Optimization Algorithms

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Oshkosh Corporation-Xiaobo Yang
Texas Tech University-Bin Li, James Yang
  • Journal Article
  • 10-02-01-0005
Published 2018-05-03 by SAE International in United States
Parameter identification is an important part of tire model development. The prediction performance of a tire model highly depends on the identified parameter values of the tire model. Different optimization algorithms may yield different tire parameters with different computational accuracy. It is essential to find out which optimization algorithm is most likely to generate a set of parameters with the best prediction performance. In this study, four different MATLAB® optimization algorithms, including fminsearchcon, patternsearch, genetic algorithm (GA), and particleswarm, are used to identify the parameters of a newly proposed in-plane flexible ring tire model. The reference data used for parameter identification are obtained through a ADAMS FTire® virtual cleat test. After parameters are identified based on above four algorithms, their performances are compared in terms of effectiveness, efficiency, reliability, and robustness. Once the best optimization algorithm for the proposed tire model is determined, this optimization algorithm is used to test different types of cost functions to determine which cost function is the best choice for tire model parameter identification. The study in this article provides…
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Automotive Components Fatigue and Durability Testing with Flexible Vibration Testing Table

SAE International Journal of Vehicle Dynamics, Stability, and NVH

University of Manitoba-Ebadur Rahman, Nan Wu, Christine Wu
  • Journal Article
  • 10-02-01-0004
Published 2018-04-07 by SAE International in United States
Accelerated durability testing of automotive components has become a major interest for the ground vehicle Industries. This approach can predict the life characteristics of the vehicle by testing fatigue failure at higher stress level within a shorter period of time. Current tradition of laboratory testing includes a rigid fixture to mount the component with the shaker table. This approach is not accurate for the durability testing of most vehicle components especially for those parts connected directly with the tire and suspension system. In this work, the effects of the elastic support on modal parameters of the tested structure, such as natural frequencies, damping ratios and mode shapes, as well as the estimated structural fatigue life in the durability testing were studied through experimental testing and numerical simulations. First, a specially designed sub-scaled experimental testing bed with both rigid and elastic supports was developed to study the effects of the additional elastic support and the mass on the change of structural modal parameters. The significant modal parameters variation due to the additional elastic support was clearly…
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Efficient Component Reductions in a Large-Scale Flexible Multibody Model

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Chalmers University of Technology-Thomas Abrahamsson
Volvo Car Corporation-Niclas S. Andersson
  • Journal Article
  • 10-02-01-0001
Published 2018-03-05 by SAE International in United States
To make better use of simulations in the automotive driveline design process there is a need for both improved predictive capabilities of typical system models and increased number of variant evaluations carried out during system concept design phase. A previously developed large-scale multibody rotor dynamical powertrain model that combines detailed linear-elastic finite element components and nonlinear joints is used to more accurately simulate system response modes and their variations across the operating-range. However, the total simulation time is too long to include extensive parameter evaluations during the rapid design iterations, which will have a negative influence on the total understanding of the designed system's behaviour. Therefore this article is about reducing such a large-scale model to one that runs faster, but without losing the ability to predict the most fundamental system characteristics. Reduction methods considering defined stimuli-response relations are well established and used within the field of control systems, to balance prediction accuracy and evaluation effort, but are not yet commonly applied to large-scaled structural models and analysis of vibrations in continuous and lightly damped…
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