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2015-08-17 ...
  • August 17, 2015 (8:30 a.m. - 4:30 p.m.) - Rosemont, Illinois
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.
2015-06-22
Event
This session includes papers in the areas of static, dynamic, and fatigue characterization of elastomers, bushings, mounts and shock absorbers used in the mobility industry. Particular emphasis is given to new and innovative analysis and testing methodologies to quantify the non-linear properties of these systems in addition to the effects of temperature, frequency, and aging. Papers dealing with specific applications and case studies of existing methodologies are also welcome.
2015-05-18 ...
  • May 18-20, 2015 (8:00 a.m. - 5:00 p.m.) - Greer, South Carolina
  • November 16-18, 2015 (8:00 a.m. - 5:00 p.m.) - Greer, South Carolina
Training / Education Classroom Seminars
While a variety of new engineering tools are becoming available to assist in creating optimal vehicle designs, subjective evaluation of vehicle behavior is still a vital tool to ensure 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 the key fundamental principles associated with longitudinal and lateral vehicle dynamics.
2015-04-22 ...
  • April 22-24, 2015 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
  • November 4-6, 2015 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
Attendees to the seminars held in conjunction with the SAE 2015 World Congress will receive COMPLETE access to Congress activities for only $55 per day. If interested, please contact our Customer Service department at +1.877.606.7323 (U.S. and Canada only) or +1.724.776.4970 (outside U.S. and Canada) to register for this special Congress daily rate. 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.
2015-04-21
Event
The purpose of this session is to provide a forum for presentations on steering and suspension related topics as it applies to ground vehicles. Papers for this session should address new approaches as well as advances in application of steering, suspension related technologies.
2015-03-31 ...
  • March 31-April 2, 2015 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
  • October 5-7, 2015 (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.
2015-01-14
Technical Paper
2015-26-0086
Prakhar Srivastava, Manish Laxman Karle, Ujjwala Shailesh Karle, Anand A Deshpande
Electric Power Assist Steering (EPAS) is a safety critical system because it affects vehicle stability and dynamics. Therefore, this system should be very reliable. To ensure safety and reliability ISO 26262 standards are adapted which is derived from IEC 61508. This standard regulates product development on system, hardware and software level and manages functional safety for electrical and electronics components. This paper discusses the applicability of the ISO 26262 standard to the development of EPAS ECU w.r.t its hardware and software design. For the hardware safety and reliability, the paper describes the hardware design safety analysis methods like Fault Tree Analysis (FTA), Failure mode and effect analysis (FMEA) and Hazard analysis. The paper discusses the use of these techniques used for improvement of reliability and safety of EPAS at component and system level.
2015-01-14
Technical Paper
2015-26-0085
Boris Belousov, Tatiana I. Ksenevich, Sergei Naumov
A distributed structure of the automated control system (ACS) was used in designing the wheel open-link locomotion module (OLLM). It has allowed splitting the system into subsystems and studying the automatic control over each individual function. The paper considers the results of the experimental studies of the ACSs, which regulate the rigidity and damping parameters of axle suspensions (the control system of the pressure in wheel suspensions), and the vertical displacements of the left and right wheels of the axle (the control systems of the vertical wheel displacements), in response of the signals that arrive to the input of the complex from the main or backup system of automated control of the vehicle. A similar method was used to study the ACS of the wheel springing system as a component of the ACS of the OLLM.
2015-01-14
Technical Paper
2015-26-0082
Jeevan N. Patil, Sivakumar Palanivelu, Vaibhav Aswar, Vipin Sharma
Air brake system is widely used in heavy truck and intercity buses for its great superiority and braking performance over other brake systems. Pneumatic brake system consists of various valves such as Dual Brake Valve (DBV), Quick release Valve (QRV), Relay Valve, Brake chambers. Dynamics of each valve is playing crucial role in overall dynamic performance of braking system. Also, it is very difficult to find the contribution of each valve in overall braking performance. In addition to this, there are various pipe diameters, which can be used between various valves. Hence, it is very difficult to find the best possible pipe diameter combination between various valves as well as contribution of each valve in overall performance through experiment as we cannot try all possible combinations on the actual vehicle.
2015-01-14
Technical Paper
2015-26-0079
Ram Ranjan Sahu, Jayant Sinha
Brake drum is an important component in automotive, which is a link between axle and wheel. It performance is of utmost importance as it is related to the safety of the car as well to the passengers. Many design parameters are taken into consideration while designing the brake drum. The sensitivity of these parameters is studied for optimum design of brake drum. The critical parameters in terms of reliability, safety & durability could be the cross section, thickness of hub, interference & surface roughness between bearing and hub, wheel loading, heat generation on drum, manufacturing and assembly process. The brake drum design is derived by considering these parameters. Hence the sensitivity of these parameters is studied both virtually & physically, in detail. The optimum value of each parameter could be chosen complying each other's values.
2015-01-14
Technical Paper
2015-26-0080
Wen Zhang, Bo Yang
Commercial vehicle plays an important role during transportation process under the demand of high speed, convenience and efficiency. So improving active safety of commercial vehicles has become a research topic. Due to the fact that braking characteristic is the basic and most closely related to safe driving of vehicles’ performances, this paper aimed to improve the braking performance by researching into an integrated control method based on the mature ABS products. Firstly, a control strategy which gave priority to ABS and differential yawing moment control, complementary with the hydraulic active suspension system control was proposed. In comparison with the single ABS system, the combined control of brake system and suspension system was designed not only for preventing wheels lock. But the directional control to avoid roll or spin was more focused on and the tires’ cornering characteristic was much better because of the invention of active suspension system.
2015-01-14
Technical Paper
2015-26-0078
Parth Lunia, Mrigendra Prajapati, V Jayashankar, Varun Parakh, Samir Rawte
A parking brake or hand brake is the mechanical hand or foot operated secondary braking system that prevents the vehicle from rolling or slipping when parked on the gradient or leveled surface and provides assistance to stop/slowdown the vehicle in case of service brake failure. This paper is an attempt to compile a systematic approach which can be easily incorporated in a product development system to design and develop parking brake system for passenger cars having rear drum brakes which in turn can effectively reduce the lead time and give a better performance. Vehicle GVW, percentage gradient and maximum effort limits (As per IS 11852-Part 3), Tire and drum brake specifications were taken as front loading. This data is further used for target setting of functional and engineering parameters, such as Lever Pull Effort, Lever Ratio and angular travel of lever. Design calculations were performed to obtain theoretical value of critical parameters like lever effort and travel.
2015-01-14
Technical Paper
2015-26-0077
Deepak Sharma, Abhishek Atal, Abhay Shah
Background: Anti-Roll bar (ARB) bushes are used for mounting Anti-Roll bar on the vehicle chassis or the sub frame. Function of ARB bushes typically made from Natural Rubber, is to provide support and take the twist loads coming from ARB articulation and provide NVH isolation from road inputs. But for this particular application of ARB involving higher articulation, Since couple of decades in all around globe a typical problem of "Creaking" noise from ARB bushes during ARB articulation had been noticed in passenger cars. Several means have been tried across the globe to control or eliminate this typical noise, such as greasing to inner surface of rubber bush, using thermo plastic polyurethane material, using Self-lubricating waxed rubber, using Teflon coating in rubber inner surface and so on. But no appreciable results, leading to customer discomfort.
2015-01-14
Technical Paper
2015-26-0084
Ishwar Patil, Kiran P Wani
With the increasing competition in automotive sector, the customer is available with more options when it comes to buying a vehicle. So it has become necessary to improve the vehicle’s characteristics which affect its impression on the customer. Handling and ride comfort are very important characteristics that influence the quality of the vehicle. These characteristics depend on the suspension system of the vehicle. The three main objectives that a suspension system of an automobile must satisfy are ride comfort, vehicle handling and suspension working space. Ride comfort is directly related to the vehicle acceleration experienced by the driver and the passengers. Higher vertical acceleration, lesser is the level of comfort. The aim of this paper is to design and analyze the semi active suspension system models using skyhook, ground hook and hybrid control method.
2014-10-09
Event
This session focuses on theoretical and experimental vehicle dynamics aspects of both on- and off-road vehicles. Papers on topics such as off-road vehicle chassis and suspension, NVH, driver/operator comfort, as well as on-road suspension design, active and semi-active suspension systems and controls, and full vehicle dynamic studies are welcomed. Topics ranging from on-road vehicles to trucks to construction and mining machinery are covered in CV205.
2014-10-07
Event
Active Safety Systems are becoming commonplace on commercial vehicle systems. These systems can include but are not limited to safety systems that assist to mitigate or in some cases, avoid accidents by intervening through visual/audible warnings, providing steering assist or active braking to slow the vehicle down. The size and complexity of the commercial vehicles offers some challenges to the application of these systems. This panel session will bring together experts in the area to discuss the recent developments and challenges going forward in the application of Anti-lock braking systems, Traction control systems, Electronic Stability Control systems, Lane Keeping Systems, Adaptive Cruise Control, Autonomous Emergency Braking system for commercial vehicles.
2014-10-07
Event
This technical session invites papers on dynamics and performance of conventional and unmanned, on-road/off-road vehicles with emphasis on dynamics and design of chassis, suspension, tires, and tracks. In the area of vehicle chassis with four and more number of driving wheels, papers are welcome, but not limited to: various types of suspensions and their interaction with the driving gear, steering, and driveline systems. Research papers presenting results on analysis, optimization, and control of tire dynamics and design for road and terrain vehicle applications are encouraged to be submitted to this session. Special attention is also given to rubber-track chassis systems and their asphalt passability and terrain mobility. Papers on conventional track system dynamics, design, and reliability issues are also invited. Energy efficiency issues, stochastic modeling, smoothness of ride, integrated design of chassis subsystems are also considered.
2014-10-01
Journal Article
2014-01-9026
Christopher Gill, Christopher Knight, Scott McGarry
Vehicle shock absorbers are designed to dissipate kinetic energy through frictional viscous forces. In some circumstances, this can be in the order of kilowatts of instantaneous power dissipation. This study quantitatively assesses the vehicle damper system energy dissipation of a low-mass utility vehicle and a high-mass hauling vehicle, using empirically derived regression models of the working dampers and custom data logging equipment. The damper force and power is derived from post-processing of the measurement of critical damper metrics, including linear velocity and temperature. Under typical operating conditions, the low-mass utility vehicle showed an average power dissipation of 39 W for a single shock absorber, and approximately 150 W for a complete vehicle-damper model. The high-mass hauling vehicle demonstrated an average power dissipation of 102 W for a single shock absorber, and approximately 600 W for a complete vehicle-damper model under laden operating conditions.
2014-09-30
Journal Article
2014-01-2320
Yiting Kang, Subhash Rakheja, Wenming Zhang
Abstract A range of axle suspensions, comprising hydro-pneumatic struts and diverse linkage configurations, have evolved in recent years for large size mining trucks to achieve improved ride and higher operating speeds. This paper presents a comprehensive analysis of different independent front suspension linkages that have been implemented in various off-road vehicles, including a composite linkage (CL), a candle (CA), a trailing arm (TA), and a double Wishbone (DW) suspension applied to a 190 tons mining truck. Four different suspension linkages are modeled in MapleSim platform to evaluate their kinematic properties. The relative kinematic properties of the suspensions are evaluated in terms of variations in the kingpin inclination, caster, camber, toe-in and horizontal wheel center displacements considering the motion of a hydro-pneumatic strut. The results revealed the CL and DW suspensions yield superior kinematic response characteristics compared to the CA and TA suspensions.
2014-09-30
Technical Paper
2014-01-2288
Boris Belousov, Tatiana I. Ksenevich, Vladimir Vantsevich, Sergei Naumov
An open-link locomotion module (OLLM) is an autonomous energy self-sufficient locomotion setup for designing ground wheeled vehicles of a given configuration that includes drive/driven and steered/non-steered wheels with individual suspension and brake systems. Off-road applications include both trucks and trailers. The paper concentrates on the module's electro-hydraulic suspension design and presents results of analytical and experimental studies of a trailer with four driven (no wheel torque applied) open-link locomotion modules. On highly non-even terrain, the suspension design provides the sprung mass with sufficient vibration protection at low level of normal oscillations, enhanced damping and stabilized angular movements. This is achieved by the introduction of two control loops: (i) a fast-acting loop to control the damping of the normal displacements; and (ii) a slow-acting control loop for varying the pressure and counter-pressure in the suspension system.
2014-09-30
Technical Paper
2014-01-2310
Anatoliy Dubrovskiy, Sergei Aliukov, Yuriy Rozhdestvenskiy, Olesya Dubrovskaya, Sergei Dubrovskiy
Abstract We have developed a fundamentally new design of adaptive suspension systems of vehicles. Their technical characteristics and functional abilities are far better than the existing designs of suspensions. We have developed the following main suspension components of vehicles: a lockable adaptive shock absorber with an ultra-wide range of control performance, implementing “lockout” mode by means of blocking adaptive shock absorber, and an elastic element with progressive non-linear characteristic and automatic optimization of localization of work areas. Our patents confirm the novelty and efficiency of our major design decisions. Advantages of our developments in the vehicle suspensions are the following.
2014-09-30
Technical Paper
2014-01-2299
Sijing Guo, Zhenfu Chen, Xuexun Guo, Quan Zhou, Jie Zhang
Abstract To integrate the energy-recovery characteristic of the Hydraulic electromagnetic shock absorber (HESA) and the anti-roll characteristic and anti-pitch characteristic of Hydraulic Interconnected Suspension(HIS), a Hydraulic Interconnected Suspension system based on Hydraulic Electromagnetic Shock Absorber (HESA-HIS) is presented. HESA-HIS has three operating modes: energy-recovery priority mode, dynamic performance priority mode and energy-recovery and dynamic performance balance mode. The working principle of HESA-HIS in the three operating modes is introduced, a full vehicle model is built by using the software AMESim, and some simulation tests are conducted by using the vehicle model. The simulation results show that the system can effectively reduce the roll angle of the vehicle, while maintaining good ride performance. Fishhook test results show that the roll angle of the HESA-HIS vehicle is reduced by 80%, compared to the traditional vehicle.
2014-09-30
Technical Paper
2014-01-2297
Mehmet Bakir, Murat Siktas, Serter Atamer
Abstract In today's world, there are a prominent number of weight and cost reduction projects within the vehicle engineering development activities. Regarding this phenomenon, a complete optimization study is applied to a leaf spring assembly, which has 4 leaves and which is used in heavy duty trucks, by reducing the number of leaves down to 3 together with weight and cost reductions. At the first step of the project, the stiffness of the leaf spring is calculated with in-house software based on mathematical calculations using the thickness profile of the leaves. Then the results of these calculations are compared with non-linear elastic leaf spring calculations which are conducted with FEA. This elastic leaf spring finite element model is transferred into Multi-Body-Simulation (MBS) model in order to determine the forces acting on the leaf spring.
2014-09-28
Journal Article
2014-01-2487
Mohamed Samy Barakat
The Braking System is the most crucial part of the racing vehicle. There is no doubt, that if only one minority failure in the braking system took place, this would be more than enough reason to cause the racing team disqualification from the competition. Time is the main and the most important criteria for any racing competition; on the other hand the formula student “FS UK SAE” competition care the most about developing the automotive engineering sense in the students by putting them under strict rules normally taken from the original version “formula 1” to encourage their creativity to reach the optimum performance under these strict rules. One of the most important rules is “No Braking by wire”, and the obvious consequences are more stopping distance and time. Braking distance is a critical facture in achieving racing success in a competitive domain.
2014-09-11
Video
Senior Editor Lindsay Brooke recently tested a McLaren 650S, with surprising results.
2014-07-21
WIP Standard
AS24585C
No scope available.
Training / Education Classroom Seminars
                                                                 Understanding vehicle dynamics is one of the critical issues in the design of all vehicles, including heavy trucks. This seminar provides a comprehensive introduction to the fundamentals of heavy truck dynamics. It covers all of the critical subsystems that must be considered by designers and decision makers in determining the effect of various components on heavy truck dynamics. This seminar begins where the tires meet the ground, progressing up through the various components and bringing together the theory and practice of heavy truck dynamics.
2014-06-30
Technical Paper
2014-01-2045
Hiromichi Tsuji, Satoshi Takabayashi, Eiji Takahashi, Hitoshi Murakami, Shinichi Maruyama
A finite element (FE) model of vibro-acoustic coupling analysis, such as a vehicle noise and vibration, is utilized for the improvement of the performance in the vehicle development phase. However, the accuracy of the analysis is not enough for substituting a prototype phase with a digital phase in the product development phases. Therefore, conducting the experiments with the prototype vehicle or the existed production vehicle is still very important for the performance evaluation and the model validation. The vehicle noise transfer function of the road noise performance cannot be evaluated with the existed excitation equipment, such as the 3 or 6 directional electromagnetic shaker. Therefore, this paper proposes new experimental method to measure the road noise vehicle transfer function. This method is based on the reciprocity between the tire contact patch and the driver's ear location.
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