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2016-12-05 ...
  • December 5, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
This seminar provides an introduction to several critical aspects of heavy truck dynamics. The comprehensive presentation and discussion will begin with the mechanics and dynamics of heavy truck tires, followed by steering dynamics, and finally moves participants into suspension kinematics and dynamics. Starting at the ground and moving up, this seminar explores the important dynamic aspects of each subsystem and how each is related to the overall truck dynamics.
2016-11-21 ...
  • November 21-23, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
Just as the chassis and suspension system provides an ideal framework for the automobile, this popular SAE seminar provides an informative framework for those involved in the design of these important systems. Emphasizing the fundamental principles that underlie rational development and design of suspension components and structures, this course covers the concepts, theories, designs and applications of automotive suspension systems.
2016-11-14 ...
  • November 14-16, 2016 (8:00 a.m. - 5:00 p.m.) - Greer, South Carolina
Training / Education Classroom Seminars
While a variety of new engineering methods are becoming available to assist in creating optimal vehicle designs, subjective evaluation of vehicle behavior is still a vital tool to deliver desired braking, handling, and other dynamic response characteristics. In order to better prepare today’s engineer for this task, this course offers twelve modules devoted to key the fundamental principles associated with longitudinal and lateral vehicle dynamics.
2016-09-28 ...
  • September 28, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
This seminar provides an introduction to the fundamental concepts and evolution of passenger car and light truck 4x4/all-wheel drive (AWD) systems including the nomenclature utilized to describe these systems. Basic power transfer unit and transfer case design parameters, component application to system function, the future of AWD systems, and emerging technologies that may enable future systems are covered. This course is an excellent follow-up to the "A Familiarization of Drivetrain Components" seminar (which is designed for those who have limited experience with the total drivetrain).
Technical Paper
Chao Yang, Nan Xu, Konghui Guo
This paper focuses on the modeling process of incorporating inflation pressure into the UniTire tire model for pure cornering. Via observing and manipulating the tire experimental data, the effects of inflation pressure on the tire cornering property are analyzed in detail, including the impacts on cornering stiffness, the peak friction coefficient, the curvature of transition region and the pneumatic trail. And the brief mechanism explanations are also given for some of those impacts. The results show that some effects of inflation pressure are similar to that of vertical load on the non-dimensional tire cornering property, and also have strong interactive effects between the two operating conditions. Therefore, in order to obtain concise expressions, the inflation pressure is incorporated into the UniTire tire model by analogy with the expressions for vertical load, and the interactive effects are also taken into account.
Technical Paper
Ryo Yamaguchi, Hiromichi Nozaki
In this study, we devised the steering assistance control that feedback of the external information from the laser sensor. We have created the emergency avoidance assistance control program by the obstacle detection in the first one, and the cornering assistance control program by the white line detection to second. Improvement in safety by these driving support can be expected. The effect of the created program was to understand by the driving simulator. In addition, we understand the synergistic effect of these steering assist program and chassis control (camber angle control, derivative steering assistance control). In the emergency avoidance assist by the obstacle detection, it made it possible to also be avoided for adding the handle operation at an early stage by the steering assistance in situations where manual operation collide by too late an obstacle avoidance handle operation.
Technical Paper
Sameer Kolte, Ananth Kumar Srinivasan, Akilla Srikrishna
As we move towards the world of autonomous vehicles it becomes increasingly important to integrate several chassis control systems to provide the desired vehicle stability without mutual interference. The principles for integration proposed in existing technical literature are majorly centralized which are not only computationally expensive but does not fit the current supplier based OEM business model. An Automotive OEM brings multiple suppliers on-board for developing the Active Safety systems considering several factors such as cost, quality, time, ease of business etc. When these systems are put together in the vehicle they may interfere with each other’s function. Decoupling their function results in heavy calibration causing performance trade-offs and loss in development time.
Technical Paper
Louis Carbonne, Niklas Winkler, Gunilla Efraimsson
The prediction in the design phase of the stability of ground vehicles subject to transient crosswinds become of increased concern with drag reduced shapes, platooning as well as lighter vehicles. The objective of this work is to assess the order of model complexity needed in numerical simulations to capture the behavior of a ground vehicle going through a transient crosswind. The performance of a full-dynamic coupling between aerodynamic and vehicle dynamic simulations, including a driver model, is evaluated. In the simulations a feedback from the vehicle dynamics into the aerodynamic simulation are performed in every time step. In the work, both the vehicle dynamics response and the aerodynamics forces and moments are studied. The results are compared to a static coupling approach on a set of different vehicle geometries.. One simplified bus geometry and five car-type geometries are evaluated.
2016-09-19 ...
  • September 19-21, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
This interactive seminar will take you beyond the basics of passenger car and light truck vehicle dynamics by applying advanced theory, physical tests and CAE to the assessment of ride, braking, steering and handling performance. Governing state-space equations with transfer functions for primary ride and open loop handling will be developed & analyzed. Building on the analysis of the state space equations, common physical tests and their corresponding CAE solutions for steady state and transient vehicle events will be presented. The "state-of-the-art" of vehicle dynamics CAE will be discussed.
Technical Paper
Mingzhuo Li, Dejian Meng, Lijun Zhang
Brake judder severely affects the riding comfort and safety of vehicle. For the brake corner system, a rigid-flexible coupling model are established based on ADAMS. In the model, brake pads, caliper, anchor and knuckle are flexible body, and the contacts between pads and disc and the contact between pads and caliper are defined in detail. Meanwhile, the vibration acceleration of the brake corner components and the contact forces between disc and pads are used as evaluation index and the evaluation system of brake judder are improved. The analysis results show that the novel model and evaluation system can be used to predict brake judder effectively.
Technical Paper
Arun Kumar Prasad, Baskar Anthonysamy, Gopalakrishn V. A., Gurdeep Singh Pahwa
Fierce completion in India’s automotive industry has led to constant production innovation among manufactures. This has resulted in the reduction of the life cycle of the design philosophies and design tools. One of the performance factors that have continues to challenge automotive designer is design and fine tune the braking performance with low cost and short life cycle. Braking performance of automotive vehicle is facilitated by the adhesion between the tyre and the ground. Braking force generated at the wheels of a vehicle have to appropriately match to the adhesion. Antilock braking system (ABS) is used for this purpose. ABS is a modern braking system which could significantly improve directional stability and reduce stopping distance of a vehicle. However this system still too complicated and expensive to use in low end compact car and pickup truck.
Technical Paper
Deaglan O'Meachair, Stamatis Angelinas, Matthew Crumpton, Antonio Rubio Flores, Juan Garcia, Pablo Barles
Bentley Motors Ltd. has developed a Carbon Silicon Carbide (CSiC) brake system for it’s Mulsanne product, introduced at 17MY. The CSiC brake system is conceived as a performance brake system, and as such offers notable improvements in brake performance In developing the brake system, particular focus was placed on meeting the refinement levels required for a premium product, and indeed as the flagship model for Bentley Motors, NVH refinement of the brake system was of particular concern. This paper intends to discuss the technical performance of the brake system and review the NVH performance of the brakes. This paper will also demonstrate the effect of vehicle isolation on the cabin NVH, and ultimately the passenger experience, by comparing the noise and vibration content in the wheel arch with that apparent to the driver.
Technical Paper
Qiang Tu, Hui Chen, Jiancong Li
Nowadays, autonomous driving has become the focus of research. As one of the key technologies in autonomous driving, the lateral planning module guides the lateral movement of the vehicle during the driving process. An integrated lateral planning module should consider the non-holonomic constraints of a vehicle, the optimization of the generated path and the applicability to various lateral driving behaviors. However, the current lateral planning methods, such as the Potential Field (PF), grid based search method and clothoid based method, can only meet parts of these requirements, instead of all. In order to satisfy all the performance requirements above, a novel PF based lateral planning method for autonomous vehicles in urban traffic environments is proposed in this paper. Firstly, a PF model is built to describe the potential risk of the traffic entities, including the obstacles, road boundaries and lines.
Technical Paper
Yuxiang Feng, Pejman Iravani, Chris Brace
The autonomous control strategy of an off-road All-Terrain Vehicle was developed on Robot Operating System (ROS). Both the position estimation and autonomous control were performed on ROS. The quad vehicle is front wheel steered with rear wheel driving, and possesses Ackermann geometry. It was powered by a brushless 36V DC motor. It can be wirelessly controlled through a TP-LINK router. The vehicle only sends out sensory measurements and receives control commands, and all computations are performed on external devices. For the position estimation phase, sensory data from GPS, IMU and wheel odometry were acquired and processed on the platform. In accordance with the ROS architecture, separate packages were developed for each sensor. Afterwards, Extended Kalman filter was performed to fuse these sensory measurements to achieve an optimizing accuracy. Necessary conversion and normalization were also conducted prior to data fusion, such as conversion from LLA to ENU for GPS measurements.
Technical Paper
Renxie Zhang
Path following controller of a six-wheel skid-steering vehicle is designed. The vehicle speed is controlled through engine speed control and the lateral vehicle steering is controlled through hydraulic braking on each side. Contrary to the common approaches considering non-holonomic constraints, vehicle dynamic characteristics and rotating wheels are considered. A hierarchical control structure is applied in this vehicle control system. The kinematic controller works out the reference yaw rate and reference vehicle speed. And a robust dynamic controller tracks the reference signal. In addition, the dynamic controller takes actuator ability into account.
Technical Paper
Xiaoyu Wang, Yun Zhao, Yufeng Lian, Yantao Tian
Recent years, with the frequent occurrence of traffic accident, the vehicle using passive safety control alone can not reduce accidents well, so how to take the initiative to avoid accident has positive significance. The research and development of intelligent vehicle active safety control is becoming more and more important. Under the condition of electric vehicle steering, the intelligent vehicle may encounter understeer or oversteer problems. In the case of big sideslip angle and high lateral acceleration, the vehicle will be out of control and cause accident. In order to improve the control stability and safety in the above situation, the intelligent electric vehicle lateral stability control algorithm research is proposed in this paper. The direct yawing moment control (DYC) method is adopted, mainly by controlling the longitudinal force of each wheel producing direct yawing moment to improve the lateral stability and security of the vehicles.
2016-08-10 ...
  • August 10-12, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
  • December 12-14, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
This seminar will present an introduction to Vehicle Dynamics from a vehicle system perspective. The theory and applications are associated with the interaction and performance balance between the powertrain, brakes, steering, suspensions and wheel and tire vehicle subsystems. The role that vehicle dynamics can and should play in effective automotive chassis development and the information and technology flow from vehicle system to subsystem to piece-part is integrated into the presentation. Governing equations of motion are developed and solved for both steady and transient conditions.
New dawn at Honda R&D President Yoshiyuki Matsumoto aims to invigorate Honda's technology and product-development organization with 'full soul.' Automated driving meets regulation: NHTSA and the next 50 years The challenges and opportunities on the road to 'zero deaths' demand a new level of federal automotive safety technical standards, and a new safety-defect reporting and recall system. NHTSA and the U.S. Congress must act boldly and quickly to make it happen. Autonomous driving meets regulation: Hands off, eyes off, brain off Euro NCAP'S president warns that without coherent policies, the growing availability of automated technologies may result in piecemeal technology development-and unintentional consequences. Designer yin meets engineer yang Efficient and effective vehicle development means even closer collaboration between the two former sparring partners.
This SAE Recommended Practice provides performance, sampling, and certifying requirements, test procedures, and marking requirements for aftermarket wheels intended for normal highway use on passenger cars, light trucks, and multipurpose passenger vehicles. For aftermarket wheels on trailers drawn by passenger cars, light trucks or multipurpose vehicles, see SAE J1204. These performance requirements apply only to wheels made of materials included in Table 1 and Table 2. New nomenclature and terms are added to clarify wheel constructions typically not used in OEM applications. The testing procedures and requirements are based on SAE standards listed in the references.
Journal Article
Emre Sert, Pinar Boyraz
Abstract Studies have shown that the number of road accidents caused by rollover both in Europe and in Turkey is increasing [1]. Therefore, rollover related accidents became the new target of the studies in the field of vehicle dynamics research aiming for both active and passive safety systems. This paper presents a method for optimizing the rear suspension geometry using design of experiment and multibody simulation in order to reduce the risk of rollover. One of the major differences of this study from previous work is that it includes statistical Taguchi method in order to increase the safety margin. Other difference of this study from literature is that it includes all design tools such as model validation, optimization and full vehicle handling and ride comfort tests. Rollover angle of the vehicle was selected as the cost function in the optimization algorithm that also contains roll stiffness and height of the roll center.
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