Mode-stirred Method Implementation for HIRF Susceptibility Testing and Results Comparison with Anechoic Method

Mode-stirred Method Implementation for HIRF Susceptibility Testing and Results Comparison with Anechoic Method PDF

Author: Truong X. Nguyen

Publisher:

Published: 2001

Total Pages: 24

ISBN-13:

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This paper describes the implementation of mode-stirred method for susceptibility testing according to the current DO-160D standard. Test results on an Engine Data Processor using the implemented procedure and the comparisons with the standard anechoic test results are presented. The comparison experimentally shows that the susceptibility thresholds found in mode-stirred method are consistently higher than anechoic. This is consistent with the recent statistical analysis finding by NIST that the current calibration procedure overstates field strength by a fixed amount. Once the test results are adjusted for this value, the comparisons with the anechoic results are excellent. The results also show that etst method has excellent chamber to chamber repeatability. Several areas for improvements to the current procedure are also identiified and implemented.

Testing Results in the Infant School

Testing Results in the Infant School PDF

Author: D.E.M. Gardner

Publisher: Routledge

Published: 2021-10-23

Total Pages: 134

ISBN-13: 100038800X

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First published in 1942, Testing Results in the Infant School describes an attempt to measure objectively the results of education in Infant schools where children are free to move and speak and play, as compared with schools of a more formal and traditional type. The book explains in detail the variety of tests used, the reasons behind them, and the children’s reactions to them. It concludes with an evaluation of the results and suggestions for their bearing on educational practice. It will appeal to those with an interest in the history, theory, and psychology of education.

Advances in Questionnaire Design, Development, Evaluation and Testing

Advances in Questionnaire Design, Development, Evaluation and Testing PDF

Author: Paul C. Beatty

Publisher: John Wiley & Sons

Published: 2019-12-05

Total Pages: 816

ISBN-13: 111926362X

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A new and updated definitive resource for survey questionnaire testing and evaluation Building on the success of the first Questionnaire Development, Evaluation, and Testing (QDET) conference in 2002, this book brings together leading papers from the Second International Conference on Questionnaire Design, Development, Evaluation, and Testing (QDET2) held in 2016. The volume assesses the current state of the art and science of QDET; examines the importance of methodological attention to the questionnaire in the present world of information collection; and ponders how the QDET field can anticipate new trends and directions as information needs and data collection methods continue to evolve. Featuring contributions from international experts in survey methodology, Advances in Questionnaire Design, Development, Evaluation and Testing includes latest insights on question characteristics, usability testing, web probing, and other pretesting approaches, as well as: Recent developments in the design and evaluation of digital and self-administered surveys Strategies for comparing and combining questionnaire evaluation methods Approaches for cross-cultural and cross-national questionnaire development New data sources and methodological innovations during the last 15 years Case studies and practical applications Advances in Questionnaire Design, Development, Evaluation and Testing serves as a forum to prepare researchers to meet the next generation of challenges, making it an excellent resource for researchers and practitioners in government, academia, and the private sector.

Compression of an array of similar crash test simulation results

Compression of an array of similar crash test simulation results PDF

Author: Stefan Peter Müller

Publisher: Logos Verlag Berlin GmbH

Published: 2022-02-08

Total Pages: 232

ISBN-13: 3832554440

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Big data thrives on extracting knowledge from a large number of data sets. But how is an application possible when a single data set is several gigabytes in size? The innovative data compression techniques from the field of machine learning and modeling using Bayesian networks, which have been theoretically developed and practically implemented here, can reduce these huge amounts of data to a manageable size. By eliminating redundancies in location, time, and between simulation results, data reductions to less than 1% of the original size are possible. The developed method represents a promising approach whose use goes far beyond the application example of crash test simulations chosen here.

An Ablation Technique for Enhancing Reentry Antenna Performance; Flight Test Results

An Ablation Technique for Enhancing Reentry Antenna Performance; Flight Test Results PDF

Author: Dallas T. Hayes

Publisher:

Published: 1974

Total Pages: 84

ISBN-13:

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To develop alternative solutions to Air Force problems relating to signal transmission in the presence of ionization, AFCRL undertook an extensive investigation of techniques for modifying reentry plasmas. The program included laboratory tests and a series of reentry flight experiments. This report describes the flight test of one successful technique, Teflon ablation, a passive approach that requires no internal support systems. A reentry vehicle fitted with a Teflon-coated nosecap was instrumented to measure antenna impedance mismatch, interantenna coupling, signal attenuation, and charged-particle density. The probe data showed that the local boundary-layer electron density decreased by as much as a factor of 200. The Teflon coating effected a 25-dB decrease in S-band signal attenuation. High-power antenna breakdown was modified by the presence of the ablation products. Details of the vehicle design, flight dynamics, and ablation, are presented, and the results of the Teflon-ablation technique are contrasted with those of a successful liquid-injection technique that was tested on a previous flight.

Fatigue Testing and Analysis of Results

Fatigue Testing and Analysis of Results PDF

Author: W. Weibull

Publisher: Elsevier

Published: 2013-10-22

Total Pages: 322

ISBN-13: 1483154165

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Fatigue Testing and Analysis of Results discusses fundamental concepts of fatigue testing and results analysis. The book begins with a description of the symbols and nomenclature selected for the present book, mainly those proposed by the ASTM Committee E-9 on Fatigue. Fatigue testing methods are then discussed including routine tests, short-life and long-life tests, cumulative-damage tests, and abbreviated and accelerated tests. Separate chapters cover fatigue testing machines and equipment; instruments and measuring devices; and test pieces used in fatigue testing. The factors affecting test results are considered, including material, types of stressing, test machine, environment, and testing technique. The final two chapters cover the planning of test programs and the presentation of results. Test program planning involves the statistical design of a test series; specification and sampling of test pieces; and choice of test pieces, testing machines, and test conditions. The chief purpose of most fatigue tests is the experimental determination of the relation between the endurance and the magnitude of the applied stress range for the material and the specimen under consideration, and final results can be condensed into a table, graph, or analytical expression.

Code of Federal Regulations

Code of Federal Regulations PDF

Author:

Publisher:

Published: 1996

Total Pages: 770

ISBN-13:

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Special edition of the Federal Register, containing a codification of documents of general applicability and future effect ... with ancillaries.

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