Display:

Results

Viewing 31 to 60 of 22790
2016-06-16
Standard
EQB2
Program Managers have considered the subject of effectiveness quantification from three diverse points of view. The first viewpoint, in conjunction with the system effectiveness analyst, is to quantify everything and to consider everything quantifiable into a figure of merit. The result is a numerical decision aid that usually has some undesirable attributes such as oversimplification, non-sensitivity to critical parameters, hidden calculations, and difficulty in exercise of the model. This technique is characterized by mathematical models, computer programs, and attempted optimizations. The second viewpoint, in conjunction with the controller, is to consider the effectiveness as specified and concentrate on cost reduction, This has a danger of formulating all technical problems in terms of cost or economic considerations. This technique is characterized by closely controlled work packages.
2016-06-16
Standard
EQB3
The Electronic Industries Association (EIA) G-47 Effectiveness QuantificationCommittee has a basic task to quantify system effectiveness. Since the support parameters underly any prime parameter quantification, the topic of support system analysis is a fundamental one to this basic committee task. The charts contained in this bulletin were developed and used for presentations to aircraft support engineering groups, to comunicate the logic and scope of system analysis applied to support system optimization.
2016-06-16
Standard
EIAIS648
This standard establishes general techniques for use in the measurement and determination of the electromagnetic emission and susceptibility characteristics of electronic, electrical, and electromechanical equipment and subsystems.
2016-06-16
Standard
EMCB1_1
This EIA Bulletin No. EMCB1-1, "Historical Rationale for Military EM1 Limits", is presented by the Electronic Industries Association G46 Electromagnetic Compatibility Committee. It has been prepared to provide a reference source for electromagnetic compatibility practitioners to enable more knowledgeable application of EMI requirements in equipment and system specifications and designs.
2016-06-16
Standard
EIAIS647
This standard establishes the performance requirements for the control of the electromagnetic emissio and susceptibility characteristics of electronic, electrical, and eletromechanical equipment and subsystems designed or procured for use in severe electromagnetic environments such as ships, aircraft, spacecraft, armored vehicles, tc. Such equipment and subsystems may be used independently or as an integral part of other subsystems or systems.
2016-06-16
Standard
GEB1
Diminishing Manufacturing Sources and Material Shortages (DMSMS) is the loss or impending loss of manufacturers or suppliers of critical items and raw materials due to production discontinuance. DMSMS is an increasingly difficult problem for DoD weapon systems because the manufacturing lives of many critical items get shorter while the life cycles of military weapon systems keep increasing. Traditionally, efforts to mitigate the effects of DMSMS have been reactive; that is, the effects are addressed only when they are seen. This reactive approach to DMSMS solutions leads to decisions that put a premium on faster solution paths with attractive short-term gains in order to avoid system inoperability, while ignoring the long-term solution paths that would lead to generic families of solutions or larger-scale solutions with the capability of avoiding future DMSMS issues. In order to solve DMSMS issues with lower overall cost, DMSMS solutions must change from reactive to proactive.
2016-06-15
Standard
AMS3813B
This specification and its supplementary detail specifications cover ropes manufactured from aramid-fiber yarns and covered with a protective jacket.
2016-06-15
Technical Paper
2016-01-1781
Matthew Maunder, Phil Grant, Duncan Mawdsley
Abstract Engine sound quality is a key attribute for sporty cars - it powerfully conveys the brand image to the driver/passengers and onlookers, and provides driver involvement by giving instant feedback about how a car is operating. Providing this has become more difficult with tighter pass-by noise regulations and the near-universal adoption of turbocharging. In the last two decades, sporty sound inside the cabin has been regained using intake sound generator systems that transfer sound more directly to the vehicle interior. The high cost of these systems is more recently driving a move towards electronic Active Sound Design with systems delivering synthetic sound through loudspeakers. However, the purist sports car market perceives this approach to be fake or artificial. An alternative approach is provided by a system for Realistic Augmented Sound by Ricardo (RAS-R) that offers a choice of two realistic engine sound sources.
2016-06-15
Technical Paper
2016-01-1783
Oliver Engler
Mercedes-AMG GmbH specializes in unique, high-performance vehicles. The image of AMG as the successful performance brand of Mercedes-Benz is reflected in its impressive successes in the world of motorsport and its unique vehicles. One of these vehicles is the SLS AMG Coupé Electric Drive. After an elaborate series of tests as well as numerous test drives, we have created the SLS eSound which captures the exceptional dynamism of this unique super sports car with electric drive. Starting with a characteristic start-up sound, which rings out on pressing the "Power" button on the AMG DRIVE UNIT, the occupants can experience a tailor-made driving sound for each driving situation: incredibly dynamic when accelerating, subdued when cruising and as equally characteristic during recuperation. The sound is not only dependent on road speed, engine speed and load conditions, but also reflects the driving situation and the vehicle's operating state with a suitable driving noise.
2016-06-15
Technical Paper
2016-01-1836
Sylvestre Lecuru, Pascal Bouvet, Jean-Louis Jouvray, Shanjin Wang
Abstract The recent use of electric motors for vehicle propulsion has stimulated the development of numerical methodologies to predict their noise and vibration behavior. These simulations generally use models based on an ideal electric motor. But sometimes acceleration and noise measurements on electric motors show unexpected harmonics that can generate acoustic issues. These harmonics are mainly due to the deviation of the manufactured parts from the nominal dimensions of the ideal machine. The rotor eccentricities are one of these deviations with an impact on acoustics of electric motors. Thus, the measurement of the rotor eccentricity becomes relevant to understand the phenomenon, quantify the deviation and then to use this data as an input in the numerical models. An innovative measurement method of rotor eccentricities using fiber optic displacement sensors is proposed.
2016-06-15
Journal Article
2016-01-1825
Jung-Han Woo, Da-Young Kim, Jeong-Guon Ih
Abstract To hear the powerful and spectrally rich sound in a car is costly, because the usual car audio system adopts small loudspeakers. Also, the available positions of the loudspeakers are limited, that may cause the reactive effect from the backing cavity and the sound distortion. In this work, a part of the roof panel of a passenger car is controlled by array actuators to convert the specified large area to be a woofer. An analogous concept of the acoustic holography is employed to be projected as the basic concept of an inverse rendering for achieving a desired vibration field. The vibration of the radiating zone is controlled to be in a uniform phase, and the other parts outside it are to be made a no-change zone in vibration. The latter becomes a baffle for the woofer, and the backing cavity is virtually infinite if the sound radiation into the passenger cabin is only of concern.
2016-06-15
Journal Article
2016-01-1844
Jonathan Millitzer, Dirk Mayer, Roman Kraus, Matthias Schmidt
Abstract Current developments in the automotive industry such as downsizing, the use of cylinder deactivation and consistent lightweight construction increasingly enable the application of active control systems for the further reduction of noise and vibration in vehicles. In the past few years, different configurations of actuators and sensors for the realization of an active control system have been investigated and evaluated experimentally. Active engine mounts, inertial mass actuators and structural integrated actuators can be used to reduce either structural vibrations or the interior noise level. As a result, a variety of different topology concepts for the realization of an active control system arises. These can be divided into an active vibration control scenario, the direct influence of the sound field with loudspeakers or the application of structural actuators for the reduction of the interior sound pressure.
2016-06-15
Technical Paper
2016-01-1857
Ettore Lappano, Frank Naets, Martijn Vermaut, Wim Desmet, Domenico Mundo
Abstract This paper proposes a specific parametric model order reduction (pMOR) scheme for the efficient evaluation of beam based structures. The model to be parameterized is a Finite Element (FE) model that represents a generic network of beams with a number of distinct cross-section types. The methodology considers geometrical parameters that describe the cross-section and the material properties of the beams as the design parameters of interest. An affine representation of the model is derived based on the description of the deformation of a uniform beam. This affine representation can be exploited for the hyper-reduction where the evaluation cost of the system matrices is reduced. The reduction of the system matrices is obtained through a projection based approach. For a given number of parameter combinations a modal basis is constructed. A global reduced order basis (ROB) is obtained through a principal component analysis of these local bases.
2016-06-15
Standard
EIAIS112
This document is intended to be used by anyone wishing to understand and/or use CDIF. This document provides a definition of a single subject area of the CDIF Integrated Meta-model. It is suitable for: - those evaluating CDIF - those who wish to understand the principles and concepts of a CDIF transfer - those developing importers and exporters.
2016-06-15
Standard
EIAIS114
This document is intended to be used by anyone wishing to understand andor use CDIF. This document provides a definition of a single subject area of the CDIF Integrated Meta-model. It is suitable for: - those evaluating CDIF - those who wish to understand the principles and concepts of a CDIF transfer - those developing importers and exporters.
2016-06-15
Standard
EIAIS111
This document is intended to be used by anyone wishing to understand and/or use CDIF. This document provides a definition of a single subject area of the CDIF integrated Meta-model. It is suitable for: -those evaluating CDIF -those who wish to understand the principles and concepts of a CDIF transfer -those developing importers and exporters.
2016-06-15
Standard
EIAIS107
This standard will assist the vendors and users of CASE tools in developing mechanisms for interchanging information between CASE tools. This standard specifies an element of a family of related standards. When used together, these standards specify a mechanism for transferring information between CASE tools.
2016-06-15
Standard
EIAIS108
This standard defines how CDIF supports multiple exchange Syntaxes and Encoding, and describes how CDIF meta-models are concretely represented during a transfer. EIAIZS-IO9 CDIF - Trartsfer- Format - Syntax SYNTAX.1 and EIAIIS-II0 CDIF - Transfer Format - Encoding ENCODING.1 define one specific CDIF Syntax and Encoding.
2016-06-15
Standard
EIAIS106
This standard will assist the vendors and users of CASE tools in developing mechanisms for interchanging information between CASE tools. This standard specifies an element of a family of related standards. When used together, these standards specify a mechanism for transfemng information between CASE tools. This standard, EIAIIS-IO6 CDIF - CASE Data Interchange Format - Overview, describes the architecture of the CDIF Family of Standards and provides an overview to all the current standards that form the CDIF Family of Standards.
2016-06-15
Standard
EIAIS110
This document is intended to be used by anyone wishing to understand and/or use CDIF. This dticument provides a definition of an encoding for CDIF transfers. -those evaluating CDIF -those who wish to understand the principles and concepts of a CDIF transfer -those developing importers and exporters.
2016-06-15
Standard
EIAIS109
The CDIF Family of Standards is primarily designed to be used as a description of a mechanism for transferring information between CASE tools. It facilitates a successful transfer when the authors of the importing and exporting tools have nothing in common except an agreement to conform to CDIF. The language that is defined for the Transfer Format also has applicability as a general language for ImportExport from repositories. The CDIF Integrated Meta-model defined for CASE also has applicability as the basis of standard definitions for use in repositories.
2016-06-14
WIP Standard
EIA554B
This standard is intended to provide guidance for selecting standardized methods for estimating the proportion nonconforming expressed as PPM. These methods are contained in EIA 554-1, EIA 554-2 and EIA 591.
2016-06-09
Standard
AS20708/14B
Scope is unavailable.
2016-06-09
Standard
AS20708/1B
Scope is unavailable.
2016-06-09
Standard
AS20708/2B
Scope is unavailable.
2016-06-09
Standard
AS20708/3B
Scope is unavailable.
2016-06-09
Standard
AS20708/4B
Scope is unavailable.
2016-06-09
Standard
AS20708/5B
Scope is unavailable.
2016-06-09
Standard
AS20708/6B
Scope is unavailable.
2016-06-09
Standard
AS20708/8B
Scope is unavailable.
Viewing 31 to 60 of 22790

Filter