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Viewing 271 to 300 of 10252
2014-11-11
Journal Article
2014-32-0053
Yoshihiro Nakagawa, Shinya Takahashi, Mikihito Masaki, Ranju Imao
Abstract In brake squeal analyses using FE models, minimizing the discrepancies in vibration characteristics between the measurement and the simulation is a key issue for improving its reproducibility. The discrepancies are generally adjusted by the shape parameters and/or material properties applied to the model. However, the discrepancy cannot be easily adjusted, especially, for the vibration characteristic of the disc model of a motorcycle. One of the factors that give a large impact on this discrepancy is a thermal history of the disc. That thermal history includes the one experienced in manufacturing process. In this paper, we examine the effects of residual stress on the natural frequency of motorcycle discs. The residual stress on the disc surface was measured by X-ray stress measurement method. It was followed by an eigenvalue analysis. In this analysis, we developed a unique method in which the residual stress was substituted by thermal stress.
2014-11-11
Standard
ARP1070D
This document outlines the development process and makes recommendations for total antiskid/aircraft systems compatibility. These recommendations encompass all aircraft systems that may affect antiskid brake control. It focuses on recommended practices specific to antiskid and its integration with the aircraft as opposed to more generic practices recommended for all aircraft systems and components. It defers to the documents listed in Section 2, for generic aerospace best practices and requirements. The documents listed below are the major drivers in antiskid/aircraft integration: 1. ARP4754, Guidelines for Development of Civil Aircraft and Systems 2. ARP4761, Guidelines and Methods for Conducting the Safety Assessment Process on Civil Airborne Systems and Equipment 3. RTCA DO-178, Software Considerations in Airborne Systems and Equipment Certification 4. RTCA DO-254, Design Assurance Guidance for Airborne Electronic Hardware 5.
2014-11-06
Standard
ARP6225
This document is for establishing tire removal criteria of on-wing civil aircraft tires only. This document is primarily intended for use with commercial aircraft but may be used on other categories of civil aircraft as applicable. The criteria are harmonized with the Care and Service Manuals of the tire manufacturers for both radial and bias tires.
2014-11-06
Magazine
Calibration and complexity Off-highway engine applications continue to increase in complexity to meet emissions regulations and fuel economy targets as well as to take advantage of advances in electrification and mechatronics. The model-based calibration process has become the industry standard. ECU advances take many paths Controllers are evolving rapidly, with a range of microcontrollers distributed throughout the vehicle Working remotely A new electrohydraulic steering technology that offers energy efficiency improvement, increased productivity, enhanced safety, and adaptability to operating conditions also has the capacity to support remote operation of a compact wheel loader.
2014-11-04
Technical Paper
2014-36-0768
Alexis Klauber Chaia Kléperon, Robson Demétrius Araújo Abreu, Rômulo Morais Bitencourt, Francis José Marochi Almeida
Abstract The vibroacoustic comfort sense inside vehicles is a topic of major concern in current automotive industry. Moreover, the increase in demand of users and the competition in the automotive sector lead automakers to invest in developing more comfortable vehicles. Thus, even noises in specific usage scenarios and short time is claimed. This paper raises the cause and proposes solutions to a noise from the brake system known as “Moan Noise”. This noise happens under specific conditions of use, but is easily identified by the user. Moreover, it is a random phenomenon and difficult to characterize. Thus, this study shows a methodology to survey the phenomenon under study and validation of proposals for improvement through operational techniques and experimental modal analysis.
2014-11-04
Technical Paper
2014-36-0771
José Carlos de Carvalho Pereira, Allan Oliveira da Silva, Gilberto Felipe Pinho, Marina Brasil Pintarelli, Thiago Gouveia Rocha
Abstract This paper describes a methodology through which is possible to design an active suspension control beginning on the geometric characteristics of a double-wishbone suspension. The used data is based on the 2011 Formula SAE car developed by the Formula UFSC Team. A front half-car model with two degrees-of-freedom was used, taking into account the parameters of the suspension and considering each tire a rigid body. The behavior of the geometric model is analyzed and equations are generated to determine the spring deformation due to each degree-of-freedom. Following, Lagrange's equations are used to obtain the movement equations of the model, which will be converted to a simplified model with the same dynamic behavior used in the control development.
2014-11-04
Technical Paper
2014-36-0805
E. Felipe Vergara, Samir Gerges, Glicéreio Trichês, Ramon Knabben
Abstract There is a great lack of Brazilian laboratory and field measurements on of noise generated by the interaction between tyre and road surface. In this study the tyre-road noise interaction on Brazilian roads through the CPX method with a wheeled trailer with enclosure that simulates a light vehicle of 700 kg equipped with two tyres and two microphones for each tyre is evaluated. Two types of sections of the road with different surfaces characteristics were evaluated with the trailer at speed of 80 km/h. The first section road is comprised of a rubberized asphalt mixture about 30 months of age and the other surface is composed of an ordinary dense asphalt mixes with approximately 10 years of age. The noise generated by the tyre-road showed that the sound pressure levels are concentrated between 630 and 1600 Hz and the differences in the sound levels are related with the characteristics and ages of the road surface.
2014-11-04
Standard
J1939DA_201411
The J1939 Digital Annex The J1939 Digital Annex, introduced in August 2013, offers key J1939 technical data in an Electronic Spreadsheet that can be easily searched, sorted, and adapted to other formats. J1939DA contains all of the SPNs (parameters), PGNs (messages), and other J1939 data previously published in the SAE J1939 top level document. J1939DA also contains all of the SLOTs, Manufacturer ID Codes, NAME Functions, and Preferred Addresses previously published in the SAE J1939 top level and the J1939-71 document. J1939DA contains the complete technical details for all of the SPNs and PGNs previously published in the SAE J1939-71 document. For all other SPNs and PGNs which are published in a document other than SAE J1939-71, J1939DA lists only basic details along with a reference to the document that contains the complete technical details. J1939DA replaces, and expands upon, the 1939 Companion Spreadsheet (CS1939), which was last published through November 2012.
2014-11-01
Journal Article
2014-01-0085.01
Andrew Pennycott, Leonardo De Novellis, Aldo Sorniotti, Patrick Gruber
The previously published equation found on page 492 contains an error which is corrected in the erratum.
2014-10-29
Article
Making the most of new materials is the aim of every automaker: Audi is among those demonstrating how it can be done—for example, by employing glass-fiber-reinforced polymer (GFRP) springs on its A6 Avant.
2014-10-29
WIP Standard
ARP6307
This document is for establishing and addressing anomalies on appearance of new and newly retreaded tires.
2014-10-27
Standard
J1801_201410
This SAE Recommended Practice provides the method to assign numerical values of brake effectiveness, using data from single station inertia dynamometer effectiveness tests, and to identify a uniform procedure to mark these values on the edge of brake blocks in excess of 12.7 mm (0.51 in) in thickness. The edge markings are intended to provide relevant and meaningful data on the normal and hot effectiveness of brake blocks, using the reference full size brake assembly, to aid in the characterization of these brake block frictional properties. This edge marking methodology is intended to permit accurate identification of the effectiveness values over the full wear life of the brake block. This is accomplished by means of permanent markings on one edge of the brake block.
2014-10-27
Standard
J1802_201410
This SAE Recommended Practice provides the test procedure and methods to calculate the effectiveness of brake blocks, using an inertia dynamometer. To minimize testing variability, and to optimize standardization and correlation, a single, high volume size of brake block is specified (FMSI No. 4515E) and evaluated in a reference S-cam brake assembly of 419 mm x 178 mm (16.5 in x 7.0 in) size, using a specified brake drum.
2014-10-23
Article
To debut in 2016 on a front-drive-based vehicle, the lightweight Flex4 features new axle-disconnect clutch technologies.
2014-10-22
Article
WABCO Holdings Inc. recently opened its fifth manufacturing facility in India, located in Lucknow. The new plant will supply advanced braking technologies, including antilock braking systems (ABS), actuators, and a range of braking valves, for multiple global heavy-truck and bus manufacturers operating in India.
2014-10-22
Book
The new Bosch Automotive Handbook , now in its 9th English edition, has been completely revised and enhanced to include the most recent developments in automotive technology. About 200 specialist authors contributed to this new version of every engineer’s must-have reference. The book's format has been revised: it is now 20 percent longer and wider, as this allows for a larger font size. This makes the texts and graphics easier to read. The index has been strongly expanded to make looking up technical terms easier. The Bosch Automotive Handbook is a best-seller, with a broad global readership. Students of engineering programs consult it, as do researchers and engineers in the automotive industry. Mechanics who are studying to become master craftsmen also use it as a reference work. Experts trust the well-founded and extensive expertise that can be found in the classic. The Bosch Automotive Handbook is widely regarded around the world as a standard work for automotive technology.
2014-10-21
Standard
J3006_201410
This Recommended Practice is derived from OEM and tier-1 laboratory tests and applies to two-axle multipurpose passenger vehicles, or trucks with a GVWR above 4536 kg (10 000 pounds) equipped with hydraulic disc or drum service brakes. Before conducting testing for a specific brake sizes or under specific test conditions, review, agree upon, and document with the test requestor any deviations from the test procedure. Also, the applicable criteria for the final test results and wear rates deemed as significantly different require definition, assessment, and proper documentation; especially as this will determine whether or not Method B testing is needed. This Recommended Practice does not evaluate or quantify other brake system characteristics such as performance, noise, judder, ABS performance, or braking under extreme temperatures or speeds. Minimum performance requirements are not part of this recommended practice.
2014-10-09
Standard
J1609_201410
This SAE Recommended Practice establishes performance guidelines of the air reservoir systems used on trucks, towing trucks, truck-tractors, trailers, and converter dollies, with GVWRs over 10 000 lb, designed to be used on the highway. NOTE: Compliance with this document does not guarantee compliance with the air reservoir requirements of FMVSS 121.
2014-10-08
Article
Among the new products WABCO displayed at the IAA Hanover CV Show was an electrically driven compressor for heavy duty air-braking systems and a new energy saving engine driven compressor.
2014-10-03
Article
Polymer composites reinforced with the "wonder material" graphene could cut structural weight by a third or more, researchers claim.
2014-10-03
WIP Standard
J3080
This Recommended Practice applies to air disc brakes fitted in commercial vehicles with a Gross Axle Weight Rating of 4536.0 kg or above.
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.
2014-10-01
Journal Article
2014-01-9028
Theodoros Kosmanis, Georgios Koretsis, Athanasios Manolas
Abstract The implementation of an electronic differential system in a delta-type, electrically assisted, three wheel Human Powered Vehicle is the subject of this paper. The electronic differential algorithm is based on the turning angle of the vehicle and its geometrical characteristics. The theoretical analysis is applied in a realistic human powered tricycle constructed in the premises of the Alexander Technological Educational Institute of Thessaloniki. The system's efficiency is validated through test measurements performed on the rear wheels during vehicle's operation in appropriately selected routes. The measurements are performed for both typical cornering and oversteering.
2014-10-01
Standard
J2902_201410
This SAE recommended practice provides procedures and methods for testing service, spring applied parking and combination brake actuators for air disc brake applications. Methods and recommended samples for testing durability, function and environmental performance are listed in 1.1 and 1.2.
2014-09-30
Article
The industry outlook for 2021 underscores engineering efficiency and flexible, modular architectures, according to industry forecasters IHS Automotive.
2014-09-30
Technical Paper
2014-01-2379
Yang Li, JianWei Zhang, Konghui Guo, Dongmei Wu
Abstract This paper presents an ideal force distribution control method for the electric vehicle, which is equipped with four independently in-wheel motors, in order to improve the lateral stability of the vehicle. According to the friction circle of tyre force, the ideal distribution control method can be obtained to make the front and rear wheels reach the adhesion limit at the same time in different conditions. Based on this, the force re-distributed control is applied to enhance the security of vehicle when the in-wheel motor is in the failure mode. The simulation result shows that: the force distributed method can not only improves the lateral stability of the vehicle but also enhances the vehicle safety.
2014-09-30
Technical Paper
2014-01-2409
C Venkatesan, R DeepaLakshmi
Abstract The automotive industry is constantly looking for new alternate material and cost is one of the major driving factors for selecting the right material. ABT is a safety critical part and care has to be taken while selecting the appropriate material. Polyamide (PA12) [1] is the commonly available material which is currently used for ABT applications. Availability and material cost is always a major concern for commercial vehicle industries. This paper presents the development of ABT with an alternative material which has superior heat resistance. Thermoplastic Elastomer Ether Ester Block Copolymer (TEEE) [3] materials were tried in place Polyamide 12 for many good reasons. The newly employed material has better elastic memory and improved resistance to battery acid, paints and solvents. It doesn't require plasticizer for extrusion process because of which it has got excellent long term flexibility and superior kink resistance over a period of time.
2014-09-30
Technical Paper
2014-01-2405
Jiaqi Xu, Bradley Thompson, Hwan-Sik Yoon
Abstract Hydraulic excavators perform numerous tasks in the construction and mining industry. Although ground grading is a common task, proper grading cannot easily be achieved. Grading requires an experienced operator to control the boom, arm, and bucket cylinders in a rapid and coordinated manner. Due to this reason, automated grade control is being considered as an effective alternative to conventional human-operated ground grading. In this paper, a path-planning method based on a 2D kinematic model and inverse kinematics is used to determine the desired trajectory of an excavator's boom, arm, and bucket cylinders. Then, the developed path planning method and PI control algorithms for the three cylinders are verified by a simple excavator model developed in Simulink®. The simulation results show that the automated grade control algorithm can grade level or with reduced operation time and error.
2014-09-30
Technical Paper
2014-01-2404
Naseem A. Daher, Monika Ivantysynova
Original equipment manufacturers and their customers are demanding more efficient, lighter, smaller, safer, and smarter systems across the entire product line. In the realm of automotive, agricultural, construction, and earth-moving equipment industries, an additional highly desired feature that has been steadily trending is the capability to offer remote and autonomous operation. With the previous requirements in mind, the authors have proposed and validated a new electrohydraulic steering technology that offers energy efficiency improvement, increased productivity, enhanced safety, and adaptability to operating conditions. In this paper, the authors investigate the new steering technology's capacity to support remote operation and demonstrate it on a compact wheel loader, which can be remotely controlled without an operator present behind the steering wheel. This result establishes the new steer-by-wire technology's capability to enable full autonomous operation as well.
2014-09-30
Technical Paper
2014-01-2386
Takahiko Yoshino, Hiromichi Nozaki
Abstract It has been reported that steering systems with derivative terms have a heightened lateral acceleration and yaw rate response in the normal driving range. However, in ranges where the lateral acceleration is high, the cornering force of the front wheels decreases and hence becomes less effective. Therefore, we applied traction control for the inner and outer wheels based on the steering angle velocity to improve the steering effectiveness at high lateral accelerations. An experiment using a driving simulator showed that the vehicle's yaw rate response improved for a double lane change to avoid a hazard; this improves hazard avoidance performance. Regarding improved vehicle control in the cornering margins, traction control for the inner and outer wheels is being developed further, and much research and development has been reported. However, in the total skid margin, where few margin remains in the forward and reverse drive forces on the tires, spinout is unavoidable.
Viewing 271 to 300 of 10252

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