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Viewing 241 to 270 of 10252
2015-01-14
Technical Paper
2015-26-0007
Medha Santosh Jambhale, J Kale, Mangesh Ramesh Saraf, Arunrajkumar Govindhasamy, Karl-Eric Köstlin
Abstract A vehicle's suspension system is the basic component which decides its dynamic performance. It is designed to separate the vehicle body and its passengers or payload from vibrations arising due to road disturbances, at the same time to ensure that the tires stay in adequate contact with the road surface. Challenges in suspension design many a time's leads in a compromise between the conflicting demands of ride comfort and road holding. Vehicles having soft suspension isolate the vehicle body from the higher frequencies in suspension but reduce the ability of the dampers to control the wheel movements which leads to poor road holding. Conversely, hard suspension provides more road holding but transmits more of the suspension movement to the body; in turn provide a less comfortable ride. The development of active/ semi active suspension has addressed both these needs and provides optimum level of ride comfort and road holding which results in the safety and driving pleasure.
2015-01-14
Technical Paper
2015-26-0077
Deepak Sharma, Abhishek Atal, Abhay Shah
Abstract In this paper, design methodology of antiroll bar bush is discussed. Typical antiroll bar bushes have slide or slip mechanism, to facilitate the relative motion between ARB and bush. Inherently, this relative motion causes wear and noise of bush. To eliminate stated failure modes, the next generation bushes have been developed, which are using torsion properties instead of slip function. These bushes are already being used in various vehicles. This paper focuses on developing the simple mathematical model, design approach and optimization of ARB bushes. Also, comparison study is presented exploring, the differences and design criteria's between conventional and new generation anti-roll bar bushes.
2015-01-14
Technical Paper
2015-26-0221
Jitesh Agrawal
Abstract Suspension is used in heavy duty vehicles to provide sufficient safety to vehicle and passengers from shocks transmitted directly from road. In commercial vehicles, leaf spring suspension used for height load carrying capability in commercial vehicle. The purpose of suspension is not only comfort and load carrying but also to support handling of vehicle however, few suspension characteristics may disturb the same on turning, braking and bouncing. One of the characteristics which disturbs on braking is brake steering where vehicle itself steers on braking and can be a major cause for life threatening accidents on highways and express ways. Optimization of this spring characteristics is quite challenging as one has to play between passenger comfort and handling of vehicle. In this paper, such behavior is studied analytically in detail. In addition, the effect of same on design parameters is studied and thereby recommendation is derived.
2015-01-14
Technical Paper
2015-26-0086
Prakhar Srivastava, Manish Laxman Karle, Ujjwala Shailesh Karle, Anand A Deshpande
Abstract Electric Power Assist Steering (EPAS) is a safety critical system because it affects vehicle stability and dynamics. In EPAS, electric motor takes the power from the battery and delivers this power to rack and pinion only on demand. Since EPAS contains electrical component such as Motor and electronic component such as Electronic Control Unit (ECU), reliability of these components is very important. To ensure safety and reliability, ISO 26262 standards are adapted which are derived from IEC 61508. This standard regulates the product development on system, hardware and software level and manages functional safety for electrical and electronic components. This paper discusses the applicability of the ISO 26262 standard to the development of EPAS ECU with respect to its hardware and software design. Hazard analysis and risk assessment of the basic EPAS architecture is performed and architecture is improved to achieve safety goal as per the standard.
2015-01-14
Technical Paper
2015-26-0079
Ram Ranjan Sahu, Jayant Sinha
Abstract 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.
2015-01-12
Article
Oxford Performance Materials launched in December the first two grades of its OXFAB 3-D printing technology—OXFAB-N and OXFAB-ESD—suitable for aerospace and other industrial markets, including transportation, energy, and semiconductor applications. The company claims this is the first time PEKK is being used for 3-D printing in aerospace and industrial applications.
2015-01-05
Article
Current products from 3M can be used to repair aluminum- and carbon fiber-intensive vehicles, but the company is working with OEMs such as General Motors to develop optimized solutions for multi-material structural applications.
2014-12-29
Article
Packing a 640-hp supercharged LT4 V8 under its muscular, CFD-designed hood, Cadillac's new performance flagship strikes many developmental balances, said Chief Engineer Tony Roma.
2014-12-17
Article
At any one time, up to 80 new steel grades are under development at ArcelorMittal. The person responsible for these advanced-development activities is Greg Ludkovsky, Vice President of Global R&D. Ludkovsky spoke with Automotive Engineering this fall at the AM/NS Calvert plant in Alabama, which the company touts as “the world’s most advanced steel finishing facility.”
2014-12-05
Article
Renesas Electronics’ new RH850/P1x-C series is a high-end version of its RH850/P1x series of 32-bit automotive microcontrollers.
2014-12-03
Standard
J1603_201412
This SAE Standard describes the performance and part requirements for elastomeric seals used in highway vehicle disc brake calipers. Seals covered by this specification may be the solid section type (square, rectangular, O-ring, etc.) mounted stationary in the cylinder bore or on the movable piston. The specification contains the following major sections:
2014-12-01
Standard
AIR4243A
This document discusses the work done by the U.S. Army Corps of Engineers and the Waterways Experiment Station (WES) in support of SAE A-5 Committee activity on Aerospace Landing Gear Systems. It is an example of how seemingly unrelated disciplines can be combined effectively for the eventual benefit of the overall aircraft systems, where that system includes the total airfield environment in which the aircraft must operate. In summary, this AIR documents the history of aircraft flotation analysis as it involves WES and the SAE.
2014-12-01
Standard
ARP6265
This document describes a recommended test procedure to assess the burst characteristics of tires used on 14CFR Part 25 or similar transport airplanes.
2014-11-30
Magazine
Riding on a high Rudi Schurmans and Ben Patel head up Tenneco's suspension and clean air divisions. Ian Adcock discovers what the automotive future holds for them Driverless revolution has begun! Breakthrough Photonic radar promises greater accuracy at lower cost, Ian Adcock discovers Winds of change are here Simulating aerodynamics will make a step-change in vehicle design, as Stephen Remondi, President and CEO of EXA, explains to Ian Adcock
2014-11-26
Standard
J1605_201411
This SAE Standard covers performance requirements and methods of test for master cylinder reservoir diaphragm gaskets that will provide a functional seal and protection from outside dirt and water.
2014-11-25
Standard
J267_201411
This SAE Recommended Practice provides minimum performance requirements and uniform laboratory procedures for fatigue testing of wheels and demountable rims intended for normal highway use on trucks, buses, truck-trailers, and multipurpose vehicles. Users may establish design criteria exceeding the minimum performance requirement for added confidence in a design. The cycle requirements noted in Tables 1 and 2 are based on Weibull statistics using 2 parameter, median ranks, 50% confidence level and 90% reliability, and beta equal to 2, typically noted as B10C50. For other wheels intended for normal highway use and temporary use on passenger cars, light trucks, and multipurpose vehicles, see SAE J328. For wheels used on trailers drawn by passenger cars, light trucks, or multipurpose vehicles, see SAE J1204. For bolt together military wheels, see SAE J1992. This document does not cover other special application wheels and rims.
2014-11-24
Article
Kia says it calls the completely redesigned MY2015 offering a multipurpose vehicle, rather than a minivan, “because there’s nothing mini in here.”
2014-11-20
Article
TRW stockholders representing 79% of the company's shares outstanding have voted to allow the proposed acquisition of the company by ZF to proceed. Under the terms of the agreement, ZF will acquire TRW in an all-cash transaction valued at approximately $12.4 billion based on equity value.
2014-11-20
Article
Bridgestone Americas announced on Nov. 18 the opening of its off-highway radial tire plant in Aiken County, SC—the first plant of its kind for Bridgestone outside of Japan, according to a company spokesperson. 
2014-11-20
Standard
J2378_201411
This SAE Recommended Practice provides instructions and test procedures for air braked trailers and dollies used in single and multiple trailer combinations on highway. This document is not intended for off-highway application.
2014-11-20
Standard
AS4833A
This SAE Aerospace Standard (AS) sets forth criteria for the selection and verification processes to be followed in providing tires that will be suitable for intended use on civil aircraft. This document encompasses new and requalified radial and bias aircraft tires.
2014-11-18
Article
"Craft shop" approach of low-volume, all-aluminum, high-end makes is too restrictive for America's best-selling vehicle. SEMA Show training classes by I-CAR demonstrate special techniques necessary and the learning curve for mainstream body shop technicians.
2014-11-18
Standard
J1214_201411
The purpose of this SAE Recommended Practice is set guidelines for tire to wheel house and body clearances on recreational vehicles.
2014-11-15
Standard
J1713_201411
This SAE Recommended Practices specifies a procedure for determining structural strength and fatigue life of disc-brake caliper assemblies which are satisfactory for vehicle usage. It is applicable to new caliper assemblies which are employed in passenger car and truck brake systems utilizing hydraulic brake fluids. Brake design and vehicle performance requirements are not included. Specification limits are left to the discretion of the responsible manufacturer. This procedure was developed for base brake operation and does not consider some unusual effects of ABS (Anti-Lock-Brake System) or Traction Control systems which may have a significant effect on the caliper. Careful analysis of the particular type ABS and/or Traction Control should be made and additional tests may be required which are not included in this document.
2014-11-15
Standard
J1476_201411
This SAE Recommended Practice establishes a method of evaluating the structural integrity of the parking brake system of all new trucks, buses, and combination vehicles designed for roadway use in the following classifications: TRACTOR, TRAILER, TRUCK, AND BUS: over 4500 kg (10 000 lb) GVWR.
2014-11-15
Standard
J1404_201411
This SAE Recommended Practice presents requirements for the structural integrity of the brake system of all new trucks, buses, and combinations of vehicles designed for roadway use and falling into the following classifications: a. Truck and Bus: Over 4500 kg (10 000 lb) GVWR b. Combination of Vehicles: Towing vehicle over 4500 kg (10 000 lb) GVWR The requirements are based on data obtained from SAE J294.
2014-11-13
WIP Standard
AIR5358A
This SAE Aerospace Information Report (AIR) was prepared by a panel of the SAE A-5 Committee. This document establishes the specifications for fluids used in landing gear shock struts with extreme pressure and antiwear additives that have been added for improved lubrication.
2014-11-11
Standard
J2377_201411
This SAE Recommended Practice (RP) provides test procedures for air braked trucks and truck-tractors used to tow single and multiple trailer combinations on highways. This RP is not intended for off-highway applications.
2014-11-11
Technical Paper
2014-32-0017
R Varunprabhu, Himadri Bushan Das, S Jabez Dhinagar
Abstract The steering system of a 3-wheeler vehicle comprises a single column steering tube. The steering inclination at handle bar end is converted to wheel slip or inclination by the steering column. A compromise in either ride or handling is considered in the functional requirement of the 3-wheeler vehicle. The 3- wheeler vehicle under study is designed for ride comfort and the handling levels are compromised. Variants of the vehicle under study are meant for public passenger transport requirements. Drivers' ride comfort is considered as the primary functional requirement during design and driver's steering fatigue is not given importance. For the comfort of driver, steering effort has to be less without compromise in handling characteristics. The driver of this type of vehicle drives the vehicle for 15-18 hours a day. Driver's feedback suggests high steering effort as a human fatigue failure mode and also a cause of shoulder pain.
2014-11-11
Technical Paper
2014-32-0088
Claudio Annicchiarico, Renzo Capitani
Abstract In a Formula SAE car, as for almost all racecars, suppressing or limiting the action of the differential mechanism is the technique mostly adopted to improve the traction exiting the high lateral acceleration corners. The common Limited Slip Differentials (LSDs) unbalance the traction torque distribution, generating as a secondary effect a yaw torque on the vehicle. If this feature is electronically controlled, these devices can be used to manage the attitude of the car. The yaw torque introduced by an electronically controlled LSD (which can also be called SAD, “Semi-Active Differential”) could suddenly change from oversteering (i.e. pro-yaw) to understeering (i.e. anti-yaw), depending on the driving conditions. Therefore, controlling the vehicle attitude with a SAD could be challenging, and its effectiveness could be low if compared with the common torque vectoring systems, which act on the brake system of the car.
Viewing 241 to 270 of 10252

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