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Viewing 1 to 30 of 1769
2011-04-12
Journal Article
2011-01-0509
Megumu Oshima, Kanya Nara
This paper describes the development of a design method and process for quality variation control. Conventional approaches utilizing Taguchi method [6,7,8] can quantify the sensitivities of parts characteristics on a system characteristic from both viewpoints of nominal value and variation. But the interpretation of the sensitivities depends on engineers' judgments. At the new process, function deployment has been introduced as the tool for breaking down hierarchically vehicle performance to the level of parts characteristics. And the relation between vehicle performance and parts characteristics is formulated based on a physical model in order to interpret the sensitivities more technically. The methodology combining the formulated function deployment and Taguchi method is referred to as design response analysis and variation effect analysis. These approaches can facilitate the interpretation of the quantified sensitivities considering the mechanism.
2011-04-12
Journal Article
2011-01-0731
M. Shariyat, Mahboobeh Rajabi Ghahnavieh
Beam-type structural elements are generally utilized in construction of majority of the automotive structures, e.g. the buses, trailers, and solid axles. These components are usually subjected to spatially-random or uncertain load conditions during their service lives. Moreover, material properties of the beams-type structural elements may vary from a sample to another in a random manner. The situation will be more complex when both material properties and load conditions exhibit random natures in the spatial domain. In the present paper, an algorithm is presented to assess the probabilistic behavior of the beam-type vehicle's components in relation with the strength and deflection requirements. A consistent finite element reliability model that may be employed for beams with arbitrary inclinations under simultaneous spatially-random loading conditions and random material properties is introduced.
2011-04-12
Journal Article
2011-01-0728
Amandeep Singh, Zissimos Mourelatos, Efstratios Nikolaidis
Reliability is an important engineering requirement for consistently delivering acceptable product performance through time. As time progresses, the product may fail due to time-dependent operating conditions and material properties, component degradation, etc. The reliability degradation with time may increase the lifecycle cost due to potential warranty costs, repairs and loss of market share. Reliability is the probability that the system will perform its intended function successfully for a specified time interval. In this work, we consider the first-passage reliability which accounts for the first time failure of non-repairable systems. Methods are available in the literature, which provide an upper bound to the true reliability which may overestimate the true value considerably. Monte-Carlo simulations are accurate but computationally expensive.
2011-04-12
Journal Article
2011-01-0725
Zissimos Mourelatos, Jing Li, Vijitashwa Pandey, Amandeep Singh, Matthew Castanier, David A. Lamb
Understanding reliability is critical in design, maintenance and durability analysis of engineering systems. A reliability simulation methodology is presented in this paper for vehicle fleets using limited data. The method can be used to estimate the reliability of non-repairable as well as repairable systems. It can optimally allocate, based on a target system reliability, individual component reliabilities using a multi-objective optimization algorithm. The algorithm establishes a Pareto front that can be used for optimal tradeoff between reliability and the associated cost. The method uses Monte Carlo simulation to estimate the system failure rate and reliability as a function of time. The probability density functions (PDF) of the time between failures for all components of the system are estimated using either limited data or a user-supplied MTBF (mean time between failures) and its coefficient of variation.
2011-04-12
Journal Article
2011-01-0726
Dan Ghiocel, Dan Negrut, David A. Lamb, David Gorsich
This research paper addresses the ground vehicle reliability prediction process based on a new integrated reliability prediction framework. The integrated stochastic framework combines the computational physics-based predictions with experimental testing information for assessing vehicle reliability. The integrated reliability prediction approach incorporates the following computational steps: i) simulation of stochastic operational environment, ii) vehicle multi-body dynamics analysis, iii) stress prediction in subsystems and components, iv) stochastic progressive damage analysis, and v) component life prediction, including the effects of maintenance and, finally, iv) reliability prediction at component and system level. To solve efficiently and accurately the challenges coming from large-size computational mechanics models and high-dimensional stochastic spaces, a HPC simulation-based approach to the reliability problem was implemented.
2011-04-12
Journal Article
2011-01-1268
Ioan F. Campean, Edwin Henshall, David Brunson, Andrew Day, Rod McLellan, Joseph Hartley
Function analysis provides the backbone of systems engineering design and underpins the use of Design for Six Sigma and Failure Mode Avoidance tools. Identification and management of interfaces is a key task in systems engineering design, in ensuring that the system achieves its functions in a robust and reliable way. The aim of the work presented in this paper was to develop and implement a structured approach for function analysis of a complex system, which focuses on the identification and characterization of interfaces. The proposed approach is based on the principle of separation of the functional and physical domains and development of function decomposition through iteration between functional and physical domains. This is achieved by integrating some existing / known engineering tools such as Boundary Diagram, State Flow Diagram, Function Tree and an enhanced interface analysis within a coherent flow of information.
2016-04-11
Journal Article
2016-01-9081
Sean A. McKelvey, Yung-Li Lee
Abstract Multiaxial loading on mechanical products is very common in the automotive industry, and how to design and analyze these products for durability becomes an important, urgent task for the engineering community. Due to the complex nature of the fatigue damage mechanism for a product under multiaxial state of stresses/strains which are dependent upon the modes of loading, materials, and life, modeling this behavior has always been a challenging task for fatigue scientists and engineers around the world. As a result, many multiaxial fatigue theories have been developed. Among all the theories, an existing equivalent stress theory is considered for use for the automotive components that are typically designed to prevent Case B cracks in the high cycle fatigue regime.
2014-09-03
Magazine
Start-up ability of UAVs on task Besides low cost, easy manufacturability, light weight, long operation time, and high durability, miniature UAVs need restart capability during flight.
2006-07-01
Magazine
Designing reliable boards The makers of electronic hardware are boosting reliability by reducing the number of components that can fail while improving ruggedization for those circuit boards. Better seen, not heard Reducing noise profiles is a multi-targeted task for engine OEMs, airframers, airport authorities, and regulatory agencies. Farnborough 2006 "Sustainable Aviation" will be a key subject as representatives of the global aerospace industry meet at the Farnborough International Airshow.
2006-02-01
Magazine
Dassault-business aviation pioneer More than four decades of design and engineering evolution have seen the French business jet producer create a wide range of twin-and tri-jet Falcons, from the 20 to the latest 7X. Maintaining reliability Regional airlines and business jet operators care about fuel efficiency, just not as much as engine reliability. Introducing Greg Henderson, SAE President for 2006 The Lockheed Martin executive steps up to take SAE into its next 100 years.
2010-01-01
Book
Jim Gammon
This new edition, extensively updated, provides a complete explanation of 33 common procedures used by fuel handlers to assess and protect aviation fuel quality. New to this Edition! o Rewritten API gravity section now includes the latest information on metric density o Fuel sampling techniques section was improved to keep up with the changes in ASTM D4306 o Revised micro-separometer section o New and vitally important section on flushing new aviation fuel hoses o Updated filtration equipment section reflects changes in the industry regarding the API/IP/EI filtration standards o Completely rewritten section on microbial contamination detection reflects the changes in the oil company and airline industry standards, changes in test equipment, and aircraft maintenance practices o And much more!
1966-09-01
Standard
AMS2360
This specification establishes a procedure for designating minimum room temperature tensile property requirements of castings by means of this AMS number and a series of dash numbers.
1978-07-01
Standard
AMS2360A
This specification establishes a procedure for designating minimum room temperature tensile property requirements of castings by means of this AMS number and a series of dash numbers.
1966-09-01
Standard
AMS2362
This specification establishes a procedure for designating minimum stress-rupture property requirements of castings by means of this AMS number and a series of dash numbers.
2007-07-13
Standard
AMS2360D
This specification establishes a procedure for designating minimum room temperature tensile property requirements of castings by means of this AMS number and a series of dash numbers.
2007-07-19
Standard
AMS2362C
This specification establishes a procedure for designating minimum stress-rupture property requirements of castings by means of this AMS number and a series of dash numbers.
1991-01-01
Standard
AMS2316A
This specification has been declared "SUPERSEDED" by the Aerospace Materials Division, SAE as of April, 1991.
1989-10-01
Standard
AMS2316
This specification has been declared "SUPERSEDED" by the Aerospace Materials Division, SAE as of April, 1991.
1967-04-01
Standard
AMS2414B
This specification covers the requirements for electrodeposed lead on metal part.
1951-10-01
Standard
AMS2414A
This specification covers the requirements for electrodeposed lead on metal part.
1948-05-01
Standard
AMS2414
This specification covers the requirements for electrodeposed lead on metal part.
1989-07-01
Standard
AMS2414D
This specification covers the requirements for electrodeposed lead on metal part.
1982-01-01
Standard
AMS2414C
This specification covers the requirements for electrodeposed lead on metal part.
2005-09-22
Standard
AMS2414G
This specification covers the requirements for electrodeposed lead on metal parts.
2016-03-22
WIP Standard
AMS2451/2B
This specification covers the requirements and process controls for brush plating of hard, low stress nickel by electrodeposition.
2006-06-20
Standard
AMS2451/2A
This specification covers the requirements and process controls for brush plating of hard, low stress nickel by electrodeposition.
2007-05-15
Standard
AMS2451/10A
This specification covers the requirements for brush plating of tin-zinc by electrodeposition.
Viewing 1 to 30 of 1769

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