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Standard
2014-02-17
This SAE Recommended Practice describes an evaluation procedure for validating tire models for use in road load simulations and assesses the relevant dynamic behavior of tires. The laboratory test utilized is a “cleat” test, where a rolling tire on a drum encounters a cleat and the resulting dynamic forces and moments are measured. This test is described in SAE J2730, “Dynamic Cleat Test with Perpendicular and Inclined Cleats”. The test is commonly used to identify tire model parameters. In this recommended practice, requirements for the measurement of the tire’s response are described along with data processing techniques and calculations used to quantitatively compare the tire model’s calculated response to the tire’s response measured on test. This recommended practice addresses both the tire model structure and its parameters.
Standard
2014-02-05
This SAE Recommended Practice provides instructions and test procedures for air braked vehicles including but not limited to trucks, truck-tractors, trailers, dollies, and buses used on highways but does not include off-highway vehicles. Purpose This document provides a method of determining the air reservoir capacity of highway type vehicles using compressed air to actuate or transmit actuation power to the foundation brakes. Air reservoir capacity is the ability to provide adequate brake pressure after a number of brake applications.
Standard
2014-02-03
This SAE Recommended Practice is intended for hubs and spoke wheels used on Class 6, 7, and 8 truck/truck-tractor non-powered front axles, powered and non-powered rear axles and trailer axles, for which bearing setting is manually adjusted. Assemblies using spacers to control bearing preload and endplay may differ in geometry and bearing componentry.
Magazine
2014-02-01
Evaluation of heavy-vehicle aerodynamic drag In an attempt to achieve a balance between Reynolds number, model scale, and tunnel blockage issues, a 1:3 scale heavy-vehicle testing program has been initiated at the Monash University 1.4-MW wind tunnel. Validating performance suspension parts advances A forum at the 2013 SEMA Show discussed three approaches to ensure performance parts compliance with Federal Motor Vehicle Safety Standard 126. Panelists also explained how simulation data, and kinematics and compliance measurements, can improve performance parts design. Active safety starts in the pilot's seat Dassault Aviation's next-generation integrated digital avionics systems contribute to enhanced air safety in civil applications. Chevrolet ups the performance ante with MY2015 Corvette Z06 Stiffer-bodied sports car gains wind-aided performance with supercharging and downforce for faster lap times.
Book
2014-01-30
The market for light vehicle suspension systems has been changing rapidly over the past few years as technology has enabled levels of comfort and road-holding to improve well beyond the boundaries of the compromise between comfort and safety that once effectively limited performance. Today, as part of an integrated chassis, advanced suspension systems are a key area through which one vehicle can be differentiated from another and on which OEMs look to build the essential 'DNA" of a vehicle. This report examines the key market drivers in this sector and details materials considerations, increasing electrification, challenges and barriers, chassis and suspension weight reduction and suspension performance. Furthermore the report looks at kinematics & elastokinematics along with the move from passive to active suspension. The report goes on to include detailed sections on suspension element technology and dampers & shock absorbers. The report also includes an appendix of 13 supplier profiles from suppliers of automotive suspension systems.
Book
2014-01-27
Boris Nikolaevich Belousov, Sergey D. Popov
Heavy-duty wheeled vehicles (HDWVs) are all-wheel-drive vehicles that carry 25 tons or more and have three or more axles. They transport heavy, bulky cargo such as raw minerals, timber, construction materials, pre-fabricated modules, weapons, combat vehicles, and more. HDWVs are used in a variety of industries (mining, logging, construction, energy) and are critical to a country’s economy and defense. These vehicles have unique development requirements due to their high loads, huge dimensions, and specific operating conditions. Hauling efficiencies can be improved by increasing vehicle load capacity; however capacities are influenced by legislation, road limits, and design. Designing HDWVs differs from other multi-purpose all-wheel-drive vehicles. The chassis must be custom-designed to suit the customer’s particular purpose. The number of axles is another variable, as well as which ones are driving and which are driven. Tires are also customizable. Translated by SAE from Russian, this book narrates the history of HDWVs and presents the theory and calculations required to design them.
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.
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