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SAE International Journal of Vehicle Dynamics Stability and NVH
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Rubber Suspension Bushing Model Identified by General Design Parameters for Initial Design Phase

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Toyota Motor Corporation-Kentaro Horiuchi, Shinichi Sakaguchi
  • Journal Article
  • 2018-01-0693
Published 2018-04-03 by SAE International in United States
This article proposes a rubber suspension bushing model considering amplitude dependence as a useful tool at the initial design phase. The purpose of this study is not to express physical phenomena accurately and in detail and to explore the truth academically, but to provide a useful design method for initial design phase.Experiments were carried out to verify several dynamic characteristics of rubber bushings under vibration up to a frequency of 100 Hz, which is an important frequency range when designing ride comfort performance. When dynamic characteristic theory and the geometrical properties of the force-displacement characteristic curve were considered using these dynamic characteristics as assumptions, an equation was derived that is capable of calculating the dynamic stiffness under an arbitrary amplitude by identifying only two general design parameters (dynamic stiffness and loss factor) under a reference amplitude. The rubber suspension bushing model was then constructed by transforming this equation. Two verifications were carried out to confirm that the model is capable of reproducing measured bushing characteristics. Previous models consist of a large amplitude stiffness component and…
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The Effect of Fixture on the Testing Accuracy in the Spindle-Coupled Road Simulation Test

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Tongji University-Gang Xu, Doudou Yan, Rui Zhang
  • Journal Article
  • 2018-01-0130
Published 2018-04-03 by SAE International in United States
The action of load on the component is crucial to evaluate the performance of durability. Another factor that affects fatigue life is the boundary conditions of the test specimen being tested by introducing unrealistic loads on the component of interest. The physical test is widely conducted in the laboratory. The fixture provides additional constraints on the test specimen as well as reaction forces to balance the test system [1]. The characteristics of the fixture involved in the test is important to analyze and assess the test results [2]. The impact of the reaction force of the fixture on the spindle-coupled axle road simulation test is presented in this article. A simplified 7-DoF (degrees of freedom) model is introduced to demonstrate the dynamic behavior of the vehicle. The influence on the internal load by the fixture has been analyzed. Followed by a more detailed MBS (multibodysystem) model to give a thorough understanding of the phenomenon. A pseudo damage analysis was conducted to show the impact of the fixture on the durability of the axle test.
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Comparison of Active Front Wheel Steering and Differential Braking for Yaw/Roll Stability Enhancement of a Coach

SAE International Journal of Vehicle Dynamics, Stability, and NVH

ASCL, Jilin Univ.-Hongyu Zheng, miao yangyang, Linlin Wang, Jiaxu Zhang
  • Journal Article
  • 2018-01-0820
Published 2018-04-03 by SAE International in United States
Both active front wheel steering (AFS) and differential braking control (DBC) can improve the vehicle handling and stability. In this article, an AFS strategy and a DBC strategy are proposed and compared. The strategies are as follows: A yaw instability judging module and a rollover instability judging module are put forward to determine whether the coach is in a linear state and whether the additional torque/angle module should be actuated. The additional torque module based on linear quadratic regulator (LQR) and the additional steering wheel angle module based on adaptive proportion integral differential (PID) fuzzy controller are designed to make the actual yaw rate and sideslip angle track the reference yaw rate and sideslip angle. Under some typical driving conditions such as sinusoidal, J-turning, crosswind, and straight-line brake maneuver on the μ-split road, simulation tests are carried out for the coach with no control, DBC strategy, and AFS control, respectively. The comprehensive comparison of simulation results is made to verify the effectiveness of proposed strategies on improving vehicle handling and yaw stability. Results also show…
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The Influence of Autonomous Driving on Passive Vehicle Dynamics

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Danisi Engineering S.r.l.-Marco Fainello, Giacomo Danisi
ETH Zürich-Alex Liniger
  • Journal Article
  • 2018-01-0551
Published 2018-04-03 by SAE International in United States
Traditional vehicles are designed to be inherently stable. This is typically obtained by imposing a large positive static margin (SM). The main drawbacks of this approach are the resulting understeering behavior of the vehicle and, often, a decrease in peak lateral grip due to oversized rear tire characteristics. On the other hand, a lower SM can cause a greater time delay in the vehicle’s response which hardens the control of a vehicle at limit handling for a human being. By introducing advanced autonomous driving features into future vehicles, the human factor can be excluded in limit handling manoeuvers (e.g., obstacle avoidance occurrences) and, consequently, the need for a high SM (i.e., high controllability for human drivers) can be avoided. Therefore, it could be possible to exploit the passive vehicle dynamics and enhance the performance, both in terms of peak grip and transient response.The goal of this article is to explore if a decrease in SM can lead to a performance advantage on an obstacle avoidance manoeuver when the vehicle is driven by a robotic controller.…
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Parameter Identification and Validation for Combined Slip Tire Models Using a Vehicle Measurement System

SAE International Journal of Vehicle Dynamics, Stability, and NVH

University of Waterloo-Matthew D. Van Gennip, John McPhee
  • Journal Article
  • 2018-01-1339
Published 2018-04-03 by SAE International in United States
It is imperative to have accurate tire models when trying to control the trajectory of a vehicle. With the emergence of autonomous vehicles, it is more important than ever before to have models that predict how the vehicle will operate in any situation. Many different types of tire models have been developed and validated, including physics-based models such as brush models, black box models, finite element-based models, and empirical models driven by data such as the Magic Formula model. The latter is widely acknowledged to be one of the most accurate tire models available; however, collecting data for this model is not an easy task. Collecting data is often accomplished through rigorous testing in a dedicated facility. This is a long and expensive procedure which generally destroys many tires before a comprehensive data set is acquired. Using a Vehicle Measurement System (VMS), tires can be modeled through on-road data alone. This reduces the time and cost significantly and does not require destroying multiple tires. Previous works regarding this parameter identification method have used only the…
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An Objective Assessment Method of Combustion Noise Characteristics in Vehicle Interiors

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Honda R & D-Kenji Torii, Kousuke Noumura
  • Journal Article
  • 2018-01-1283
Published 2018-04-03 by SAE International in United States
To increase the efficiency of measures targeting combustion noise in complete vehicle development, the authors developed a new sound quality evaluation method by combining two known methods: the time domain combustion noise separation method (T-CNSM) and a psychoacoustic metric, fluctuation intensity.The T-CNSM was applied to the vehicle interior noise, allowing for precise extraction of the combustion contribution in the time domain. Furthermore, the T-CNSM has enabled a sound quality check of combustion noise using a headphone-playback system. The procedure of this method is as follows. Firstly, simultaneous measurement of vehicle interior noise and in-cylinder pressure of each cylinder is carried out under acceleration. Afterward, the application of digital signal processing using Fourier transform and multiple regression analysis to the measured data extracts the contribution of combustion noise from the vehicle interior noise in the time domain.Subjective evaluation tests using Scheffe’s paired comparison method were conducted with 14 noise, vibration, and harshness (NVH) development experts via a headphone-playback system. Multiple types of combustion noise in vehicle interiors obtained by the T-CNSM were used for the presentation…
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