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Transient Response Analysis and Synthesis of an FSAE Vehicle using Cornering Compliance

SRM Institute Of Science And Technology-Vasanthkumar CH, Shubham Subhnil, Pranav Suresh, K Kamalakkannan
SRM Institute of Science & Technology-Nanthakumar Ajd
  • Technical Paper
  • 2019-28-2400
To be published on 2019-11-21 by SAE International in United States
OBJECTIVE Race vehicles are designed to achieve higher lateral acceleration arising at cornering conditions. A focused study on the steady state handling of the car is essential for the analysis of such conditions. The transient response analysis of the car is also equally important to achieve best driver-car relationship and to quantify handling in the range suitable for a racing car. This research aims to investigate the design parameters responsible for the transient characteristics and optimize those design parameters. This research work examines the time-based analysis of the problem to truly capture the non-linear dynamics. Apart from tires, chassis can be tuned to optimize vehicle handling and hence the response times. METHODOLOGY To start with, the system is modelled with governing parameters and simulation is carried out to set baseline configurations. Steady state and transient handling simulations run independent of each other with independent logic, coded on MATLAB. The static testing of the chassis is carried over using a Kinematic & Compliance (K & C) testing rig to get Compliance Budget and hence the calculated…

Modelling and validation of a Control Algorithm for Yaw stability and Body Slip Control using PID and fuzzy Logic based controllers

SITAMS-Chellappan Kavitha
VIT University-Umashankar Lath, Sanyam Kakkar, Aman Agarwal, Bragadeshwaran Ashok, Vemuluri Ramesh Babu, Sathiaseelan Denis Ashok
  • Technical Paper
  • 2019-28-0054
To be published on 2019-10-11 by SAE International in United States
Advanced driver-assistance system (ADAS) is becoming an essential part of modern commercial vehicle. At any instance Vehicle handling and stability is determined by the yaw rate and body slip of the vehicle. Active steering control with Electronic brake force distribution system can help in precise control of body slip and yaw control. In most of the existing research work on active steering, Control algorithms are based on single track vehicle (2 DOF) with a linear tire model for calculating the desired parameters. But these simplified model fails at high speed, tight corners and in case of combined tire slip as it neglect parameters like the non-linearity of tire model, Ackermann of the steering system and effect of two track on the stability of vehicle. The aim of this research work is to fill the existing research gap by incorporating all the mentioned drawback in a new control algorithm. A Full vehicle 14 DOF and 6 DOF model with a nonlinear tire model based on Pacejka’s “Magic tire formula” was made in Simulink, the two track…

Fundamentals of Vehicle Dynamics

  • Professional Development
  • PD731620
Published 2019-05-31

Vehicle design always involves conflicting goals. A suspension system that’s optimized for ride is not always the best for handling. The powertrain that gives best acceleration is not likely to be the most fuel-efficient.


Snowmobile Lane Change Dynamics with One and Two Occupants

30 Forensic Engineering-Mark Paquette, Harrison Griffiths
Published 2019-04-02 by SAE International in United States
As with other motor vehicles, snowmobile operators are occasionally presented with potential hazards that require a response to avoid an impending collision. The typical responses involve either braking, steering, or a combination of both. Although the braking deceleration capabilities of snowmobiles have been documented in several published studies, there is a lack of available data regarding the swerving capability of snowmobiles. In addition, it is unknown if the presence of a passenger on a snowmobile negatively affects its swerving capabilities, and if so, to what extent. This paper presents data gathered during swerve testing conducted on an instrumented snowmobile in northern Ontario with two different operators, and with one and two occupants.
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Estimation of Side Slip Angle Interacting Multiple Bicycle Models Approach for Vehicle Stability Control

Andong National University-Bongchoon Jang
Chassis R&D-Youngjin Hyun
Published 2019-04-02 by SAE International in United States
This paper presents an Interacting Multiple Model (IMM) based side slip angle estimation method to estimate side slip angle under various road conditions for vehicle stability control. Knowledge of the side slip angle is essential enhancing vehicle handling and stability. For the estimation of the side slip angles in previous researches, prior knowledge of tire parameters and road conditions have been employed, and sometimes additional sensors have been needed. These prior knowledge and additional sensors, however, necessitates many efforts and make an application of the estimation algorithm difficult. In this paper, side slip angle has been estimated using on-board vehicle sensors such as yaw rate and lateral acceleration sensors. The proposed estimation algorithm integrates the estimates from multiple Kalman filters based on the multiple models with different parameter set. The IMM approach enables a side slip angle estimation from originally equipped vehicle sensors without prior knowledge of tire and road. The proposed estimation algorithm is evaluated via vehicle tests in electronic control unit level. The results have shown that the proposed estimator can successfully estimate…
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Experimental Analysis of Suspension Kinematics and Compliance Characteristics of Sensitivities and Combined Load Cases with the Suspension Motion Simulator

Auto Mobil Forschung Dresden GmbH-Axel Gerhard
Dresden University of Technology-Chao Liu, Clemens Deubel, Junyu Zhou, Jan Kubenz, Günther Prokop
Published 2019-04-02 by SAE International in United States
The vehicle handling dynamics stands in the central place of the automotive developing processes. The accurately parameterized vehicle handling models play an important and useful role at different vehicle developing phases. At the early phase of vehicle development, they can be used to set the desired target by comparing the handling characteristics of competitors' vehicles. For the further developments of active systems, the right parameterized models are the basis to design the control systems in a virtual simulative environment. Therefore, there are the strong needs to develop a systematic methodology to parametrize the vehicle handling models, whose qualities should also be assured by the validation of field tests.The kinematics and compliance (KnC) behavior of the suspension is in the focus of this study. Compared with parameterization methods of other chassis subsystems, sensitivity analyses of suspension KnC testing conditions were very few in literatures published. With the help of the Suspension Motion Simulator (SMS) from MTS Systems Corporation, different factors of testing conditions (such as testing speeds, tire pressures, damper temperatures etc.) have been researched as…
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Measuring the Displacement of a Vehicle Body with an Optical Measuring System (Motion Capture)

Hyundai Motor Company-Jung Woo Hur, Joong Jei Ahn, Joo Tae Oh
Published 2019-04-02 by SAE International in United States
The 3D measurement of a body displacement on a moving vehicle is a quite challenging process. Well-known displacement measuring device such as a dial gauge and strain gauge can measure the displacement in only limited areas. An accelerometer also can estimate body motion but it has an accumulated error and a bias issue for an acquisition of displacements. However, an optical measuring (Motion Capture) method which uses markers and multiple cameras can read 3D coordinates directly and carry out those measurements well.In this paper, first, we determined how to extract a body displacement from global motion. Then we suggested a combining measurement methodology which uses a motion capture and an accelerometer simultaneously. Though it has failed to compensate each result and exact displacement, we showed an accuracy comparison between a motion capture and an accelerometer to measure a displacement along this process.Next we verified the measuring error of the motion capture and considered data smoothing techniques, the low pass filter and the weighted moving average, to improve the accuracy. Finally we applied the motion capture…
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Braking and Swerving Capabilities of Three-Wheeled Motorcycles

Kineticorp LLC-Nathan Rose, Neal Carter, William Neale, Nathan Mckelvey
Published 2019-04-02 by SAE International in United States
This paper reports testing and analysis of the braking and swerving capabilities of on-road, three-wheeled motorcycles. A three-wheeled vehicle has handling and stability characteristics that differ both from two-wheeled motorcycles and from four-wheeled vehicles. The data reported in this paper will enable accident reconstructionists to consider these different characteristics when analyzing a three-wheeled motorcycle operator’s ability to brake or swerve to avoid a crash. The testing in this study utilized two riders operating two Harley-Davidson Tri-Glide motorcycles with two wheels in the rear and one in the front. Testing was also conducted with ballast to explore the influence of passenger or cargo weight.Numerous studies have documented the braking capabilities of two-wheeled motorcycles with riders of varying skill levels and with a range of braking systems. The results reported here showed that when both the front and rear brakes are utilized, the decelerations produced during braking are consistent with, but in the upper half of, the range of decelerations previously reported for two-wheeled motorcycles. Studies of two-wheeled motorcycles commonly report that most of the deceleration is…
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2019 Toyota RAV4: Doubling down on a best-seller

Automotive Engineering: February 2019

Paul Seredynski
  • Magazine Article
  • 19AUTP02_17
Published 2019-02-01 by SAE International in United States

To say the RAV4 is a crucial product for Toyota might be underselling it. In the U.S., the 5-seat, 5-door FWD/AWD midsize SUV has become Toyota's best-selling vehicle, the nation's best-selling non-pickup truck and the best-selling vehicle in its class. The market's SUV sway is also apparent in RAV4, as its annual sales volume has doubled in the last five years, cresting 400,000 in 2017.

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1D Tire Model Parameter Synthesis for Vehicle Handling Targets Assessment “A Strategy of Optimization and Evaluation of Tire Math’s”

Tata Motors Ltd-Sunil Kumar, Shoaib Iqbal
Tata Technologies Ltd-Arunmohan Pattathil
Published 2019-01-09 by SAE International in United States
Handling performance of a vehicle is a key characteristic determining the response of vehicle under different operating scenarios. An insight into these vehicle-handling characteristics at early stage can be extremely useful in the design and development process. Tire characterization and tuning is important and mandatory to scrutinize each functional and individual parameter of tire. Tire force and moment data is having a significant effect in vehicle handling. Segregation of tire parameter, which is contributing vehicle-handling performance, helps to identify and perform optimization for improvisation.The main objective of this study is development and integration optimized 1D tire model into multibody dynamics model of the vehicle to observe various vehicle compliances towards its handling performance target. First part of the work deals with 1D tire model parameter synthesis tool development utilized for calculation of tire parameters such as lateral force and aligning torque for different loading condition and varying slip angle. These parameters are the function of slip angle and inclination (camber) angle and slip ratio. Second part of the work focuses on vehicle handling assessment using…
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