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SAE International Journal of Vehicle Dynamics, Stability, and NVH

  • Journal
  • V129-10EJ
To be published on 2020-03-31 by SAE International in United States
This is the electronic format of the journal
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Numerical optimization of independent suspension hardpoint

Universidade Federal de São João del Rei-Olavo Fava Furtado Alvim, Marcio Eduardo Silveira
  • Technical Paper
  • 2019-36-0154
Published 2020-01-13 by SAE International in United States
The present work aims to use complex tools for the calculation of vehicle dynamics, using optimization analysis. The study was applied to a single seat off-road prototype that has independent suspension, Double A or WishBones type, both on the front and rear axles and whose main objective will be the analysis of the prototype suspension arms fixing points. A multi-body model was created by MotionView software and straight-line acceleration and deceleration analyzes were applied to obtain better longitudinal load transfer ratios for the axes, besides the force measurements for the arm connections during these events. After the creation of the multi-body model, some studies using optimization tools, through HyperStudy software, were performed in order to obtain the new positions of the attachment points in the chassis, achieving a better dynamic suspension design. The new points change the longitudinal load transfer design and generate controlled alteration between predefined parameters in the behavior of the camber and toe in angles resulting in a different suspension arm geometry. In addition, the new geometry also had a pickup analysis…
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Modelling and Simulation of Vehicle Suspension System with Variable Stiffness Using Quasi-zero Stiffness Mechanism

SAE International Journal of Vehicle Dynamics, Stability, and NVH

University of Petroleum and Energy Studies, India-Mohit Saini
  • Journal Article
  • 10-04-01-0003
Published 2019-12-02 by SAE International in United States
The dynamics and comfort of a vehicle closely depends on the stiffness of its suspension system. The suspension system of a vehicle always had to trade-off between comfort and performance of a vehicle; since for comfort a softer suspension is preferred which in turn decreases the aerodynamics and cornering performance and increases the ride height of the vehicle; whereas in stiffer suspension the ride height can be lowered, but forces due to bumps are transferred all the way up to the drivers cabin. This article aims to design a vehicle suspension model with variable stiffness using quasi-zero stiffness (QZS) mechanism and study its force-displacement characteristics and minimize the fundamental stiffness of the suspension system. The model developed uses the principle of negative stiffness to achieve low stiffness for the softer suspension system. The mechanism designed comprises of a pushrod suspension system with three parallel springs attached to one end of the rocker arm, one primary coil spring is mounted perpendicular to the rocker arm and the other two secondary plate springs are attached to the…

Electronic Differential Control of Rear-Wheel Independent-Drive Electric Vehicle

SAE International Journal of Vehicle Dynamics, Stability, and NVH

China-Hang Yun
Jiangsu University, China-Ren He
  • Journal Article
  • 10-04-01-0004
Published 2019-12-02 by SAE International in United States
To track desired slip ratios and desired longitudinal speeds at the centers of driving wheels in the curve, this article proposes a hierarchical structured electronic differential control (EDC) of rear-wheel independent-drive electric vehicle (EV). In the high-level control, a fuzzy algorithm-based coefficient is computed according to the driver’s emotional intention of acceleration. The fuzzy algorithm-based coefficient is used to correct the desired driving torque of vehicle transmitting to the medium-level control. In the medium-level control, an optimization algorithm is developed to allocate the desired torques with requirement of as much accurate yaw moment as possible by the desired driving torque of the vehicle and yaw moment. And the desired longitudinal speeds at the centers of the rear left and right wheels are corrected twice, respectively, by Ackermann steering principle, considering the slip angle of the wheel and yaw moment. Based on the desired torques and desired longitudinal speeds at the centers of the rear left and right wheels from the medium-level control, desired slip ratios and desired angular speeds of the rear left and right…
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Model Based Design of Chassis-Frame with MATLAB

VE Commercial Vehicles, Ltd.-Rishabh Singh Parihar, Gaurav Sharma, Nitinkumar prabhakar Patil, Yogendra Aniya
  • Technical Paper
  • 2019-28-2429
Published 2019-11-21 by SAE International in United States
In the current commercial vehicles market, ride-comfort and handling are crucial parameters for the customer and end user. There are various aspects which determine the vehicle behavior. One of aspects is the structural rigidity of the vehicle, which has its own effect on vehicle dynamics. To meet the required stiffness of the main structural component of the vehicle i.e. chassis frame, FEA analysis has to be done in current methodology. The number of iterations have to be done to build an appropriate model with low weight, which can meet the design requirements. At first, conceptual design mock-up unit is to be developed then FEA (CAE) analysis to be done on it. If any design criteria are not met, then this cycle repeats again until it fulfils the required stiffness.Today, the direct stiffness procedure is the basic principle of almost every FEA software package. In this paper, computer code based on MATLAB software is provided and presented for the analysis of the chassis frame using the direct stiffness method. The code, models a structure of the…
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Development of a Graphical User Interface (GUI) Based Tool for Vehicle Dynamics Evaluation

Mahindra & Mahindra, Ltd.-Divyanshu Joshi, Saravanan Muthiah
Mahindra Research Valley-Shubham Kedia
  • Technical Paper
  • 2019-28-2397
Published 2019-11-21 by SAE International in United States
Objective metrics for performance evaluation of ride, handling and steering are required to compare, validate and optimize dynamic behavior of vehicles. Some of these objective metrics are recommended and defined by International Organization for Standardization (ISO) and Society of Automotive Engineers (SAE), which involve data processing, statistical analysis and complex mathematical operations on acquired data through simulation or experimental testing. Due to the complexity of operations and volume of data, evaluation is often time consuming and tedious. Process automation using existing tools such as MS Excel, nCode, Siemens LMS, etc. includes several limitations and challenges, which make it cumbersome to implement. This work is about development of a centralized platform for quantification, visualization and comparison of ride, handling and steering performance metrics obtained from testing and simulation data as per relevant ISO standards. In this work ISO standards related to ride (ISO 2631-1, 2631-5, 10326), handling (ISO 4138, 7401) and steering (ISO 13674-1) are implemented and automated using built-in functions and toolboxes in MATLAB. Further, several mathematical tools and operations such as plot comparisons in…
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A Comparative Study to Assess the Effect and Cause of Ride Quality and Comfort of Passenger Vehicle with Subjective Correlation

Advanced Structures India-Rahul Ramola, Anuj Jha
Vellore Institute of Technology-Aniruddha Deouskar
  • Technical Paper
  • 2019-28-2410
Published 2019-11-21 by SAE International in United States
Vehicle Dynamics testing has its importance in the fields of benchmarking and the validation of mathematical models built in order to predict the ride performance of the vehicle. The importance of enhancing the ride comfort is increasing day by day in present day scenario because of the long hours of driving experience. In presented work, the ride testing is done for two hatchback vehicles on highway conditions in order to compare the ride quality and ride comfort. The parameters like Vibration Dose Value, SEAT factor and Ride Diagram values are used to evaluate the ride comfort. After successful evaluation of the vibration levels affecting the ride comfort of the driver as well as the passenger the next major task is to identify and study the cause of the discomfort. The cause of the discomfort is studied and analyzed in terms of the complex motion of the vehicle. Vehicle motions like choppiness produces higher levels of discomfort as compared to the vertical movement of the vehicle. In order to correlate the objective test results with driver…
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Countering the Destabilizing Effects of Shifted Loads through Pneumatic Suspension Design

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Virginia Tech, USA-Yang Chen, Mehdi Ahmadian
  • Journal Article
  • 10-04-01-0001
Published 2019-11-08 by SAE International in United States
This article proposes a novel approach to reduce the destabilizing impacts of the shifted loads of heavy trucks (due to improper loading or liquid slosh) by pneumatic suspension design. In this regard, the pneumatically balanced suspension with dual leveling valves is introduced, and its potential for the improvement of the body imbalance due to the shifted load is determined. The analysis is based on a multi-domain model that couples the suspension fluid dynamics, shifted-load impacts, and tractor-semitrailer dynamics. Truck dynamics is simulated using TruckSim, which is integrated with the pneumatic suspension model developed in AMESim. This yields a reasonable prediction of the effect of the suspension airflow dynamics on vehicle dynamics. Moreover, the ability of the pneumatic suspension to counteract the effects of two general shifted loads - static (rigid cargo) and dynamic (liquid) - is studied. The simulation results indicate that the dual-leveling-valve suspension results in a reduction in roll angle and roll rate of the vehicle body for both static and dynamic load-shifting cases, as compared to the conventional single-leveling-valve suspension. Suppression of…
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FCA claims North America's most-advanced driving simulator

Automotive Engineering: November/December 2019

Paul Seredynski
  • Magazine Article
  • 19AUTP11_09
Published 2019-11-01 by SAE International in United States

FCA recently inaugurated what it's billing as the most advanced driving simulator in North America at its Automotive Research and Development Centre (ARDC) in Windsor, Ontario. The new Vehicle Dynamics Simulator (VDS) provides nine degrees of freedom and driver-specific calibrations to emulate a vehicle's driving behavior on a wide range of surfaces and environments. The new hardware-in-the-loop test bench will permit iterating a host of simulated systems between concept and prototype phases to improve the overall product experience.

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You've Lost That Queasy Feeling…

Autonomous Vehicle Engineering: December 2019

Stuart Birch, Bill Visnic
  • Magazine Article
  • 19AVEP11_06
Published 2019-11-01 by SAE International in United States

Transcontinental research aims to understand the complexities of motion sickness to help improve the automated-vehicle experience.

As concerns mount regarding how occupants of automated vehicles (AVs) will react to being detached from the actual driving experience, researchers are trying to better understand how and why humans are affected by motion sickness. Aided by sophisticated tools and measuring apparatus, multinational research efforts are quantifying the causes of motion sickness - while grappling with the intensely individual nature of the problem.

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