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SAE International Journal of Vehicle Dynamics Stability and NVH
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ERRATUM: Design of Adjustable Road Feeling Performance for Steering-by-Wire System

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Concordia University-Bin Li
Jilin University-Hongyu Zheng, Jian Zhou
  • Journal Article
  • 10-02-02-0008.1
Published 2018-09-21 by SAE International in United States
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Integrated Driving and Braking Control Unit for Electric Bikes

SAE International Journal of Vehicle Dynamics, Stability, and NVH

National Chung Hsing University, Taiwan-Chun-Liang Lin, Min-Chi Hsieh, Tao-Hung Chen
  • Journal Article
  • 10-02-03-0015
Published 2018-10-04 by SAE International in United States
In this research, an integrated driving and braking control unit was developed for electric bikes. The unit integrates the driving and braking circuits in a module. Alternate commutation was used to design the driving and braking unit of a customized brushless direct-current hub motor (BLDCHM). The braking torque for the braking section is generated through alternating the duty cycle of the pulse-width-modulated (PWM) commands of the switching elements and phase sequence arrangement of the current conduction loops. The current conduction loops in the motor and switching elements is arranged to adjust the braking torque in a sophisticated way. The integrated design has been successfully tested in a commercialized electric bike with a BLDCHM.
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Open Access

Study of the Sliding Door Shaking Problem and Optimization Based on the Application of Euler’s Spiral

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Hunan University, China-Ziming Chen, Luoxing Li, Yunlong Wu
Oushang R&D Center of Changan Automobile Company, China-Wufeng Zhou
  • Journal Article
  • 10-02-03-0014
Published 2018-10-03 by SAE International in United States
This study focuses on the sudden shaking phenomenon of a sliding door passing through a corner. This phenomenon requires attention because shaking during movement can lead to a harsh operation feeling and a short service life. An experiment based on a test setup was conducted, and the sudden change in the acceleration of a sliding door panel was measured. Based on multi-body dynamics (MBD) analysis and a rigid-flexible coupled model of the sliding door system, the cause of the sudden shaking was determined to be the discontinuous curvature of the middle rail trajectory. A transition curve was proposed as the solution for the discontinuous curvature, and Euler’s spiral was applied in the redesign of the middle rail trajectory. Verified by simulations, the results exhibit considerable improvement in sliding door movement stability, with large reductions in the maximum center of mass (CM) acceleration and guide roller impact force.
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Structural Optimization Techniques to Design Light Weight and Low Radiated Noise Components

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Eaton Technology Pvt Ltd-A.S. Bhuwal, Siddesh Kapdi, M.D. Jinto
  • Journal Article
  • 10-02-03-0013
Published 2018-07-24 by SAE International in United States
Structural optimization evolved as a preferred technique across industries to develop lightweight products. One of the widely studied topics in structural optimization is to develop methods that reduce the radiated noise from a structure, where responses like Equivalent Radiated Power (ERP) and natural frequencies used to indirectly address the noise levels. This article compares freeform optimization with topology optimization technique and investigates their effectiveness for reducing radiated noise and weight. To illustrate the same, Finite Element Method (FEM) and Boundary Element Method (BEM) analyses are performed on a sheet metal flat plate (panel) as an example and correlated the same with experimental data. Further, different optimization problem formulations have been explored on those examples and results have been compared. The aim of this study is to identify an effective optimization technique and problem formulation, which can be deployed on complex engineering products to reduce the radiated noise with a minimum weight penalty.
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Optimization Control for 4WIS Electric Vehicle Based on the Coincidence Degree of Wheel Steering Centers

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Concordia University-Bin Li
Jilin University-Hongyu Zheng, Shuo Yang
  • Journal Article
  • 10-02-03-0011
Published 2018-07-24 by SAE International in United States
The steering centers of four wheels for passenger car do not coincide, which may result in tire wear and the unharmoniously movement of the vehicle. In this article, an optimization control method for Four Wheel Independent Steering (4WIS) electric vehicle based on the coincidence degree of steering centers is proposed, to improve the driving performance. The nonlinear vehicle model of the four-wheel independent steering vehicle is established, and the formula of the wheel steering center is derived. The coincidence degree of wheel steering centers is defined as the evaluation index, to describe and evaluate the performance of the coordination for wheels’ movement. Meanwhile, the structure design of 4WIS system and the establishment of Direct-Current (DC) steering motor model are carried out, and the Model Predictive Control (MPC) controller for steering actuator is designed. The coincidence degree and related performance index for 4WIS vehicle steering system are performed as the optimization target for vehicles to achieve the optimal control by neural network predictive control algorithm. Simulations based on high-fidelity CarSim model show the effectiveness of the…
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Feature-Based Response Classification in Nonlinear Structural Design Simulations

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Chalmers University of Technology-Thomas Abrahamsson
Volvo Car Corporation-Niclas Andersson, Raoul Rinaldo
  • Journal Article
  • 10-02-03-0012
Published 2018-07-24 by SAE International in United States
An applied system design analysis approach for automated processing and classification of simulated structural responses is presented. Deterministic and nonlinear dynamics are studied under ideal loading and low noise conditions to determine fundamental system properties, how they vary and possibly interact. Using powerful computer resources, large amounts of simulated raw data can be produced in a short period of time. Efficient tools for data processing and interpretation are then needed, but existing ones often require much manual preparation and direct human judgement. Thus, there is a need to develop techniques that help to treat more virtual prototype variants and efficiently extract useful information from them. For this, time signals are evaluated by methods commonly used within structural dynamics and statistical learning. A multi-level multi-frequency stimulus function is constructed and simulated response signals are combined into frequency domain functions. These are associated with qualitative system features, such as being periodic or aperiodic, linear or nonlinear and further into subcategories of nonlinear systems, such as fundamental, sub or super harmonic and even or odd order types. Appropriate…
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