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Viewing 151 to 180 of 3582
2015-09-22
Technical Paper
2015-36-0415
I. Coutinho, L. F. Vales, C. B. S. Vimieiro
Abstract Vehicle durability mission loads are an essential and decisive for a reliable life prediction for the component through any durability evaluation. One option to calculate mission loads are multibody models to represent vehicle’s suspension degrees of freedom (dofs) and its dynamic behavior. Generally, trucks have greater wheelbase and then lower natural frequencies than passengers’ vehicles. Therefore are more suitable to dynamic body excitation and the ordinary consideration of a rigid body shell is not relevant. The proposal of this work is to compare the chassis loads considering rigid and flexible frame mounted over the primary suspension. A pseudo-damage was calculated with chassis loads time history for severity assessment. The chose vehicle for the study is an Iveco 4×2 medium range, 6850mm of wheel base, with gross weight of 17ton and leaf springs primary suspension on both: front and rear axles.
2015-09-22
WIP Standard
AMS2416M
This specification covers the engineering requirements for an electrodeposit of cadmium into an electrodeposit of nickel on carbon, low-alloy, and corrosion-resistant steels.
2015-09-22
WIP Standard
AMS2418J
This specification covers the requirements for electrodeposited copper.
2015-09-22
WIP Standard
AMS2484C
This specification covers the requirements for an inorganic blackening solution for steel, applied at room temperature.
2015-09-22
WIP Standard
AMS2700F
This specification covers the requirements for a process to assure removal of free iron or other less noble contaminants from the surfaces of corrosion resistant steel parts.
2015-09-22
WIP Standard
AMS2486F
This specification establishes the requirements for a chemical conversion coating on titanium alloys.
2015-09-21
Article
Principal Engineer considers acoustic holography as the next step in the further development of its new noise measurement system.
2015-09-15
Technical Paper
2015-01-2500
Brigitte Vasques
The drilling of multi layers composite stacks remains a common process in aerospace industry. Research of productive solutions such as one shot and dry drilling operations to avoid reaming and lubrication are contemplated by aerospace customers on titanium multi layers composite applications. Those solutions permit to reduce the number of finishing operation and drilling time. Special ADEs (Advanced Drilling Equipment) machines are used to drill aircraft components in limited access areas. Parameters such as cutters, ADE machines type, rigidity clamping, cutting conditions, speed, feed, chip fragmentation and extraction are related and influence the holes quality. Titanium (TA6V) thickness and cutting configuration influence the cutter wear development. In this work, ADE and specific cutter geometries developed by Apex are used for the one shot dry drilling of titanium. Carbide cutters have been chosen for their resistance to the heat developed by titanium drill.
2015-09-15
Technical Paper
2015-01-2549
Marc-André Léonard, Jean-François Boland, Christophe Jégo, Claude Thibeault
Abstract Design assurance guidance such as DO-254, and commercial off the shelf (COTS) increasing popularity in high critical mission have pushed the validation and verification methodologies to improve by integrating fault tolerance analysis in reliability assessment. A novel methodology for analysing the sensitivity of digital designs to single event upsets (SEU) is proposed. We first characterize basic combinational circuit models using fault injection via mutation technique at low level of abstraction. Error analysis is performed at primary outputs to identify patterns that are collected in a faulty behaviour library. This library is then used at a high level of abstraction to execute a sensitivity analysis on a digital design model. A reliability report is then generated showing the soft error rate (SER) and the benign errors count. We proved our methodology by analysing the radiation sensitivity of a discrete wavelet transform architecture using two different sets of data.
2015-09-15
Technical Paper
2015-01-2615
Donald Jasurda
The aerospace industry is continually becoming more competitive. With an aircraft's large number of components, and the large supplier base used to fabricate these components, it can be a daunting task to manage the quality status of all parts in an accurate, timely and actionable manner. This paper focuses on a proof of concept for an aircraft fuselage assembly to monitor the process capability of machined parts at an aircraft original equipment manufacturer (OEM) and their supply chain. Through the use of standardized measurement plans and statistical analysis of the measured output, the paper will illustrate how stakeholders can understand the process performance details at a workcell level, as well as overall line and plant performance in real time. This ideal process begins in the product engineering phase using simulation to analyze the tolerance specifications and assembly process strategy, with one of the outputs being a production measurement plan.
2015-09-15
Technical Paper
2015-01-2555
Ephraim Suhir, Alain Bensoussan, Johann Nicolics
There is a concern that the continuing trend on miniaturization (Moore's law) in IC design and fabrication might have a negative impact on the device reliability. To understand and to possibly quantify the physics underlying this concern and phenomenon, it is natural to proceed from the experimental bathtub curve (BTC) - reliability “passport” of the device. This curve reflects the combined effect of two major irreversible governing processes: statistics-related mass-production process that results in a decreasing failure rate with time, and reliability-physics-related degradation (aging) process that leads to an increasing failure rate. It is the latter process that is of major concern of a device designer and manufacturer. The statistical process can be evaluated theoretically, using a rather simple predictive model.
2015-09-15
Journal Article
2015-01-2388
Luis Rabelo, Tom Clark
Abstract Although a multitude of anomaly detection and fault isolation programs can be found in the research, there does not appear to be any work published on architectural templates that could take advantage of multiple programs and integrate them into the desired systems. More specifically, there is an absence of a methodological process for generating anomaly detection and fault isolation designs to either embed within new system concepts, or supplement existing schemes. This paper introduces a new approach based on systems engineering and the System Modeling Language (SysML). Preliminary concepts of the proposed approach are explained. In addition, a case study is also mentioned.
2015-09-11
Article
Endurica targets tire and rubber product developers with new software release. CAE software adds features for the analysis of rolling structures, self-heating, wrinkling, and cavitation.
2015-09-06
Technical Paper
2015-24-2526
Borislav Klarin, Thomas Resch, Chiara Sessarego, Giorgio Spanu, Gianni Lamonaca
This paper presents a methodology for numerical investigation of a full flexible balancer drive together with engine and crank train under realistic operating conditions where shaft dynamics, gear contact and rattle impacts, gear root stresses and friction losses in bearings and gear interaction are taken into account and can be balanced against each other to achieve the design criteria. Gear rattle is driven by the speed fluctuation of the crank train, the resistance torque (mainly friction), shaft inertia and the backlash in the gears. The actual trend to engine downsizing and up-torqueing increases the severity to rattle as engines are running on higher combustion pressures. This increases torque and speed fluctuation, which makes the detailed investigation in this torque transfer even more demanding. A common method to reduce gear rattle is the usage of so-called scissors gears.
2015-08-27
Standard
J2654_201508
Hardness measurements are used as a quality control check of the consistency of formulation and processing of brake linings. This hardness method is nondestructive. NOTE—This method is not a measure of friction level. The hardness and the range of hardness are characteristic of each formulation; therefore, the acceptable values and ranges must be established for each formulation and may be affected by processing. NOTE—The hardness of sintered powder metal lining is usually determined with Rockwell superficial hardness equipment. (See ASTM B 347)
2015-08-26
Article
TECAT has developed a system to measure torque on a flexplate accurately and in-situ.
2015-08-26
Article
Helium leak detection systems are helping transmission suppliers improve quality and reduce the cost of producing new automatic transmissions.
2015-08-25
WIP Standard
AMS2810H
This specification provides requirements for the identification and packaging of sheet, strip, extrusions, and molded parts made of natural rubber, synthetic rubber, reclaimed rubber, and combinations of the above with other materials such as asbestos, cork, and fabrics. AMS2817 covers preferred requirements for identification and packaging of preformed packings.
2015-08-24
Article
Even as simulation and virtual design tools get ever more sophisticated, brick-and-mortar test facilities are as important as ever.
2015-08-24
Article
DTS' TSR data logger line includes a ±20 g sensor range.
2015-08-19
Article
The 2017 GT development program has begun testing in southeastern Michigan, with the exotic American supercars running “naked” as they rack up miles amid daily commuter traffic. Automotive Engineering encountered and photographed one of the off-tool prototypes recently.
2015-08-11
Article
A $2.5 million upgrade turns an existing climatic cell into one of the industry's most capable facilities for 4x4 and AWD vehicle development.
2015-08-10
Article
Tucked within the University of Michigan's Ann Arbor campus is a glimpse of the automotive future. In this episode of SAE Eye on Engineering, Senior Editor Lindsay Brooke looks at Mcity, a new proving ground that will help automakers and suppliers develop automated and driverless car technologies.
2015-07-29
Article
SAKOR Technologies supplies a test system for the Dream Chaser atmospheric flight control system, serving as a spacecraft emulator to test overall system performance.
2015-07-28
Article
The 6DX PRO for gathering kinematic data for research and engineering validation was designed by DTS specifically for occupant dynamics and human injury assessment.
2015-07-24
WIP Standard
AS13005
The project will cover three areas (step 1 New Production): define a standard approach for the internal audit system used by the supplier to ensure that it has the correct scope and effectiveness the effectiveness of AS9100 and Nadcap third party assessment define a standard/common approach for the audit of supplier´s production and process to be used by engine manufacturers, suppliers and the sub tiers based on result/confidence in 1) and 2)
2015-07-23
Article
Physics-based robot simulation leveraging stochastic optimization and game theory will support new NASA missions.
2015-07-01
Standard
EIA584
Conventional attribute sampling plans based upon nonzero acceptance numbers are no longer desirable. In addition, emphasis is now placed on the quality level that is received by the customer. This relates directly to the Lot Tolerance Percent Defective (LTPD) value or the Limiting Quality Protection of MIL-STD-105. Measuring quality levels in precent nonconforming, although not incorrect, has been replaced with quality levels measured in parts per million (PPM). As a result, this standard addresses the need for sampling plans that can augment MIL-STD-105, are based upon a zero acceptance number, and address quality (nonconformance) levels in the parts per million range. This document does not address minor nonconformances, which are defined as nonconformances that are not likely to reduce materially the usability of the unit of product for its intended purpose.
2015-07-01
Standard
EIA681
It is the purpose of this document to provide guidance for companies and registrars to achieve a consistent assessment of a producers compliance to the requirements of Process Certification (EIA-599). In addition , a technique is provided as an option for the assessment of a producer's level of quality system maturity.
2015-06-30
Article
Off-highway machine mounting systems, especially the cab mounting system, significantly affect the operator comfort in the cab by providing enough damping for a good ride and isolating the structure-borne forces from traveling into the cab.
Viewing 151 to 180 of 3582

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