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Viewing 271 to 300 of 9909
Article
2014-01-24
A new SAE International book narrates the history of heavy-duty wheeled vehicles and presents the theory and calculations required to design them. Translated from Russian, the book summarizes the results of the authors’ academic research and experience, and presents innovative technical solutions used for electric and hydrostatic transmissions, steering systems, and active safety of these vehicles.
Article
2014-01-24
Knorr-Bremse has expanded its production capacity in India in both the rail- and commercial-vehicle (CV) sectors with the opening of two new facilities in Palwal and Pune, as well as a new Development Center in Pune to be shared by its two divisions.
Article
2014-01-20
A brake pedal made from fiber-reinforced plastics debuts on a MY2014 sports car, and ZF's CEO says this application underscores the broad possibilities for lightweight materials.
Article
2014-01-12
Researchers at Ashok Leyland make a case for choosing stainless steel over galvanized steel and aluminum for the complete bus structure. Although the initial material cost is higher for stainless steel, it scores better in other areas including mechanical and thermal properties and optimized structure weight. On the whole, the lower life cycle cost (LCC) offsets the initial material cost and yields rich dividends to the end customer, they claim.
Article
2014-01-08
With the world's first pickup featuring an all-aluminum body and cargo box and full LED lighting, Ford leapfrogs its domestic and Japanese competition in the highly profitable full-size truck segment. The structures feature 5xxx- and 6xxx-series alloy sheet, the latter with a T4 temper.
Standard
2014-01-08
This standard is for cutting edge sections typically used in earth-moving machinery defined in SAE J1116 and ISO 6165: a. Scrapers as defined in ISO 7133. b. Dozers as described in ISO 6747. c. Loaders as described in ISO 7131. d. Graders as described in ISO 7134. Hole spacing is defined ISO 7129. Hole conformation is defined in SAE J740.
Article
2014-01-06
Bridgestone Commercial Solutions has launched the Bridgestone R244 all-position steer radial tire. The new tire meets the demands of dump trucks and concrete mixer truck fleets that spend a higher percentage of their miles in on-highway use.
Article
2014-01-06
Wheel rim components made of 3/4-in steel plate in diameters to 40 in (1016 mm) and larger for use on tractors and other off-highway vehicles are fabricated by Acme Metal Spinning. Available in quantities of five to a few hundred or more, these components are fabricated using Acme’s advanced metal spinning processes.
Standard
2014-01-03
This SAE Recommended Practice establishes the mounting hardware to be used with demountable rims, wheels for demountable rims, rim spacers designed for 28 degrees bevel mounting systems, and intended for use on commercial vehicles. The dimensions given are those necessary to maintain serviceability and interchangeability of mounting hardware. This document is divided into two sections. Section 1 establishes the practice for new designs for mounting hardware. Section 2 records information on current mounting hardware. Special and less common applications are not covered in this document.
Book
2014-01-01
Michael Spektor
Solving Engineering Problems in Dynamics helps practicing engineers successfully analyze real mechanical systems by presenting comprehensive methods for analyzing the motion of engineering systems and their components. This analysis covers three basic phases: 1) composing the differential equation of motion; 2) solving the differential equation of motion; and 3) analyzing the solution. Although a formal engineering education provides the fundamental skills for completing these phases, many engineers nonetheless would benefit by gaining further insight in using these fundamentals to solve real-life engineering problems. This book thus describes in step-by-step order the methods related to each of these phases. Features • A basic education in engineering is sufficient to master the contents of this guide and effectively apply its step-by-step methods for solving engineering problems. • Numerous solutions of examples of linear, non-linear, and two-degree-of-freedom systems are found throughout. • Explains the structures of differential equations of motion of the two-degree-of-freedom systems and demonstrates the applicability of the Laplace Transform methodology for solving these equations. • Many types of engineers can benefit from this book (as well as students in mechanical, manufacturing, and industrial engineering).
Standard
2013-12-20
This SAE Recommended Practice establishes a uniform procedure for the level road test of the brake systems of all classes of motorcycles intended for highway use.
Technical Paper
2013-12-20
Claire Mercier
As part of the aircraft certification process, landing gear has to be certified against particular risks such as bird and tyre impact cases. According to international aviation regulations, it has to be demonstrated that the landing gear is designed to ensure the capability for continued safe flight and landing after bird impact or after tyre impact resulting from wheel or tyre failure. Structural parts such as the down-lock mechanism must be validated against these requirements since their structural integrity is essential to ensure landing gear down-locking for landing and subsequent on ground movement. Recently, MESSIER-BUGATTI-DOWTY has been involved in the development of explicit analysis in support of bird and tyre impact justification. A model of the down-lock mechanism has been developed and a full scale test has been set up in order to demonstrate the validity of the analysis. Two extensive test campaigns have been performed considering bird and tyre impact cases using highly instrumented components to record strains and displacements on impacted parts.
Standard
2013-12-20
This procedure describes a method for generating, preparing and analyzing samples of new and unused brake friction materials for their chemical constituents.
Standard
2013-12-17
This SAE Standard specifies brake system performance and test criteria to enable uniform evaluation of the braking capability of self-propelled, ride-on vibratory steel wheel, static steel wheel, and rubber-tire roller compactors with maximum level surface machine speeds of 25 km/h or less. Service, secondary, and parking brakes are included. Machines with maximum level surface machine speeds greater than 25 km/h shall conform to the requirements of SAE J/ISO 3450.
Standard
2013-12-17
This SAE Recommended Practice applies to S-CAM, Wedge, and Disc air brake actuators where the stroke can be measured without disassembly from the brake.
Standard
2013-12-16
This SAE Aerospace Recommended Practice (ARP) defines a procedure for demonstrating service overload capability for new, main and nose landing gear, radial or bias tires fitted on multiple wheel landing gear of Part 25 certified aircraft.
Standard
2013-12-16
This SAE Aerospace Information Report (AIR) identifies current nondestructive inspection (NDI) methods used to ensure product integrity and maximize "in service" life of the major structural components of aircraft wheel and brake assemblies.
Article
2013-12-06
2015 Nissan GT-R and 2014 Sentra "concept" introduced at Los Angeles Auto Show, along with 2014 NISMO RS version of Juke, join the "just NISMO" that's already on sale. GT-R's 3.8-L V6 is up from 545 to 600 hp (406 to 488 kW). Juke RS performance raised to 215 hp (160 kW) with six-speed manual.
WIP Standard
2013-12-04
The scope of the test method is to provide stakeholders including fluid manufacturers, brake manufacturers, aircraft constructors, aircraft operators and airworthiness authorities with a relative assessment of the effect of deicing chemicals on carbon oxidation. This test is designed to assess the relative effects of runway deicing chemicals by measuring mass change of contaminated and bare carbon samples tested under the same conditions.
Standard
2013-12-04
This SAE Standard applies to all new production air brake and air accessory reservoirs used in automotive vehicles and off-road machines. This document defines an “air reservoir” as a reservoir having single or multiple compartments that is used for storage of compressed air. This document does not apply to accumulators or reservoirs for storage of gases other than compressed air.
Technical Paper
2013-11-27
Wanyang Xia, Gangfeng Tan, Shuo Wang, Jiameng Wang
Good braking performance is an important guarantee for the vehicle driving. In the condition of frequent or prolonged braking, the overheating problem for the traditional mechanical braking device causes the recession of the braking performance, which is a prominent problem especially for the commercial vehicle perennial traveling in the mountains. Eddy current retarder can reduce the mechanical brake load as a kind of auxiliary braking device. Thus, the temperature of the mechanical braking device would not be too high, and the traveling safety of the vehicle can be ensured. But eddy current retarder would cause an enormous impact for automobile battery when it starts up and huge electricity energy would be consumed which means that more automotive batteries are needed. Considering above, a kind of self-excited eddy current retarder is developed in the paper. First, the design scheme for the self-excited eddy current retarder is illustrated based on the retarder's working principle, mechanical structure and the energy recovery features.
Technical Paper
2013-11-27
Dong Zhang, Changfu Zong, Shengnan Yang, Weiqiang Zhao
Electronic braking system (EBS) of commercial vehicle is developed from ABS to enhance the brake performance. Based on the early development of controller hardware, this paper starts with an analysis of the definition of EBS. It aims at the software design of electronic control unit, and makes it compiled into the controller in the form of C language by the in-depth study about control strategy of EBS in different braking conditions. Designed controller software is divided into two layers. The upper control strategy includes the recognition algorithm of driver's braking intention, estimation algorithm of the vehicle state, conventional braking strategy which consists of the algorithm of deceleration control and braking force distribution, and emergency braking strategy which consists of the algorithm of brake assist control and ABS control. Lower control strategy includes feed-forward compensation and PID control of proportional relay valve, on-off control of axle modulator, on-off control of axle modulator of ABS solenoid valve and the design of CAN communication.
Technical Paper
2013-11-27
Kannan Elumalai
Automotive industry is moving towards a stage that anticipates probability of accidents and instructs safety system to take immediate actions. Safety systems in automotive domain protect vehicle occupants and even pedestrians from accidents. High powered engines and good road infrastructure naturally thrills people to drive at very high speed which would result into forward collision. With the help of latest technologies, such accidents can be avoided and thereby many persons would be saved from major injuries. This does not indicate that people could drive as they wish irresponsibly. The safety systems will help vehicle occupants to be safe in case of inadvertent errors. Nowadays safety has become an important feature to be considered for selling vehicles. This paper will provide an overview on the operations of various advanced safety systems such as pre-crash, Electronic brake assist, Lane Keeping support, and speed alert system, Safety systems for teenagers, early warning car to car communication and co-operative safety system.
Technical Paper
2013-11-27
Shashidhar Dasi, Balakrishnan Mariappan
Linear static analysis of heavy commercial truck chassis assembly has become an industry practice during the concept stage evaluation. Non-linear analysis of chassis is rarely performed due to computational time and resource constraints. However, linear assumptions might not be appropriate for certain regions in the chassis assembly. In this paper, sub-modeling technique is applied for solving specific regions in the full chassis assembly to capture the actual boundary information for local non-linear analysis without intervention of user.
Technical Paper
2013-11-27
Ankit Pant, Chetan Prakash Jain, Deepak Kumar Panda
For any new vehicle development, NVH target setting is crucial activity. Structural modification are to be done in early design phase to improve cabin comfort by identifying the sensitive paths and taking appropriate countermeasures for reduction of noise or vibrations transmission to cabin. A benchmark vehicle is taken to define the target areas for next model development. Numerical computations with suitably modified virtual model are carried out to accelerate the development cycle. Transfer path analysis (TPA) is an established technique for estimation and ranking of individual low-frequency noise or vibration contributions via the different structural transmission paths from point coupled powertrain or wheel-suspensions to the vehicle body [1]. TPA technique can also be used to define the improvement targets for future vehicles. This paper presents the methodology of carrying out the “Target Setting” using TPA for numerical model development for new model prior actual prototyping which will result into achieving desired NVH level in cabin.
Technical Paper
2013-11-27
Parag Nemichand Jain, Satish Pavuluri
In mining tippers, rear suspension plays a major role in defining vehicles ride and handling characteristics, stability and load carrying capacity. Bogie type of suspension is well suited for these applications. Bogie suspension mainly consists of bogie bracket, leaf springs and radius rods. Nonlinear static analysis is performed for a bogie bracket assembly considering bolt pretension and contacts to evaluate the static strength of bogie bracket. Since bogie bracket is connected to frame with several bolts, a sensitivity analysis is carried out to study the effect of bolt loosing on bogie bracket. The surface contact interaction (stick-slip) behavior between frame and bogie suspension mounting bracket is also studied. Good correlation is achieved with testing results.
Technical Paper
2013-11-27
Jongchol Han, Zhao Weiqiang, Changfu Zong, Hongyu Zheng
The simulation of electro-pneumatic components used in brake systems of commercial vehicles is of great importance in order to understand their characteristics for developing a control logic and improve the braking performance. As the goal of improving the performance of the commercial vehicle pneumatic EBS(Electronically controlled Braking System), static and dynamic characteristics of proportional relay valve for commercial vehicle pneumatic EBS have been simulated by using MATLAB/Simulink environment and validated by testing on hardware-in-the-loop test bench focused on its pressure hysteresis characteristic. The simulation and test results show that the mathematic model for proportional relay valve characteristics is reasonable and reliable, and this simulation tool can be used for research and developing of pneumatic EBS system for commercial vehicle effectively.
Technical Paper
2013-11-27
Muthuraj R, Vignesh E, Kannan C, Sundararajan Thiyagarajan
The objective of this project is to reduce the weight of a wheel without affecting its primary functions such as fitment, air flow and fatigue life, the design is made with the concept of variable thickness, meaning reducing thickness wherever the stresses are low and also addressing the failures in the field. However, requirement of a prototype makes the validation process laborious, costly and time consuming. Finite Element Method (FEM) has evolved as a resourceful tool for analyzing various components under a variety of operating conditions. It is being used not only to predict the critical points bearing the highest stress in a wheel, but also to predict its fatigue life. The present study focuses on the design of variable thickness disc and validation of the same using FEM for air flow analysis and Rig testing. The analysis was carried out on existing and proposed designs and the salient features were compared.
Technical Paper
2013-11-27
Hongyu Zheng, Changfu Zong, LiJiao Yu
A new road feel feedback control design of steer-by-wire (SBW) is proposed, which is produce the steering feel of conventional vehicle with equipped electronic power steering (EPS) system, due to SBW system removes mechanical linkages between steering system and front wheels. A dynamic model is established to study the road feel generation and deal with the need of computed rack force of steer system. Based on the analysis of the assisting characteristic and the active damping control strategy of the EPS system, an integrated road feel algorithm is proposed. For rack force is difficult to measure, an estimator is presented to estimate rack force by Kalman filter (KF). The hardware-in-the-loop simulation (HILS) test bench results show that the proposed road feel control design make drivers get road feel information and SBW system can improve the vehicle maneuverability and comfortably.
Technical Paper
2013-11-27
Prasad M. Rao
The paper concentrates on generating maximum tire grip by using the frequency response system of individual automobile components. Tire data has been consulted for and used to verify the findings presented in this paper. The tire data has been provided by the FSAE Tire Test Consortium (TTC) & Calspan Tire Research Facility (TIRF), U.S.A. specifically for FSAE/FS teams. Tire parameters such as vertical load, tire temperature, tire pressure, etc. have been given highest weightage as they directly affect the major force outputs in addition to frequency excitement. Suspension geometry design and its role as a precursor to an effective shock absorbing setup have been highlighted here. The damping has been calculated and algorithms related to it have been presented here since effective and quick response of the vehicle's behaviour can be modified through this. Frequency algorithms have been generated after crosschecking with tire data that aim at maximizing tire grip. The base automobile used here is a Formula Student vehicle built as per the 2011 rules and regulations.
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