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Book Experimental Modal Analysis and Dynamic Component Synthesis Volume 5 Universal File Formats

Download or read book Experimental Modal Analysis and Dynamic Component Synthesis Volume 5 Universal File Formats written by and published by . This book was released on 1987 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: The concept of an ASCII, 80 character per record, data base format, referred to as a Universal File, is presented to serve as the basis for data exchange between different hardware and software environments. Since the data involved is concerned with the structural dynamics testing and analysis areas, the Universal File formats include initialization files, geometry files, measurement files, and analysis data files. The Universal File format that is utilized originated with the Structural Dynamics Research Corporation. Keywords: Computer files; Vibration testing.

Book Experimental Modal Analysis and Dynamic Component Synthesis Volume 1 Summary of Technical Work

Download or read book Experimental Modal Analysis and Dynamic Component Synthesis Volume 1 Summary of Technical Work written by and published by . This book was released on 1987 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is one of six reports that represent the final technical report on the work. Experimental Modal Analysis and Dynamic Component Synthesis. The reports that are part of the documented work include the following: Vol. I Summary of Technical Work; Vol. II Measurement Techniques for Experimental Modal Analysis; Vol. III Modal Parameter Estimation; Vol. IV System Modeling Techniques; Vol. V Universal File Formats; Vol. VI Software User's Guide; For a complete understanding of the research conducted under this contract, all of the Technical Reports should be referenced. Keywords: Modal testing; Vibration testing; Dynamics.

Book Experimental Modal Analysis and Dynamic Component Synthesis Volume 2 Measurement Techniques for Experimental Modal Analysis

Download or read book Experimental Modal Analysis and Dynamic Component Synthesis Volume 2 Measurement Techniques for Experimental Modal Analysis written by and published by . This book was released on 1987 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: When attempting to experimentally determine the dynamic properties (natural frequency, damping, and mode shapes) of a structure, one of the most important aspects is to collect and process data that represents the structure as accurately as possible. This means that 'clean' and error free data must be collected. This data must be processed by an appropriate frequency response function model. This data can then be used as input to an number of parameter estimation algorithms and could also be used in modal modeling algorithms. This technical report describes the procedure used to collect this data. Many of the potential errors are discussed as well as techniques to eliminate or reduce the effects of these errors on the quality of the results. Throughout the time frame of this contract, it was determined, that if the procedures described in this technical report are followed, data can be collected, as input to modal parameter estimation algorithms, that will yield accurate dynamic properties of the test structure. With care and attention to theoretical limitations, these dynamics properties can be used to construct a modal model.

Book Cities and Their Vital Systems

Download or read book Cities and Their Vital Systems written by Advisory Committee on Technology and Society and published by National Academies Press. This book was released on 1989 with total page 1298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cities and Their Vital Systems asks basic questions about the longevity, utility, and nature of urban infrastructures; analyzes how they grow, interact, and change; and asks how, when, and at what cost they should be replaced. Among the topics discussed are problems arising from increasing air travel and airport congestion; the adequacy of water supplies and waste treatment; the impact of new technologies on construction; urban real estate values; and the field of "telematics," the combination of computers and telecommunications that makes money machines and national newspapers possible.

Book Experimental Modal Analysis and Dynamic Component Synthesis Volume 6 Software User s Guide

Download or read book Experimental Modal Analysis and Dynamic Component Synthesis Volume 6 Software User s Guide written by Randall J. Allemang and published by . This book was released on 1987 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document describes briefly the history and current state of development of the Real Time Executive (RTE) Modal Program. The purpose of this document is to provide a reference for the operation of the RTE Modal Program and to provide a reference for future program development. The RTE Modal Program has been developed as a replacement of an earlier program (User Program 9) that was written for the HP-5451-B Fourier system. The original concept of an RTE based program began in 1978 but was not realized in a working form until early in 1981. Based on the operating system of the HP-5451-B, Basic Control System (BCS), continued expansion of that software is prohibitive due to the inflexible programming environment and the memory limitations. To address these problems, the RTE Modal Program utilizes the overhead functions of the File Management Program under (RTE), an operating system available on Hewlett Packard computers, to provide flexibility that does not have to be built into the modal software. The emphasis of the modal software development in the RTE environment is toward supportability rather than efficiency. For future development reasons and based upon the research nature of the Structural Dynamics Research Laboratory, the ability of graduate students to extend and enhance the current software is always the primary consideration. In this way, the modal software can eventually support any type of data acquisition system as well as interface through file structures to related software such as finite element analysis packages.

Book Flight vehicle Materials Structures and Dynamics assessment and Future Directions Structural dynamics and aeroelasticity

Download or read book Flight vehicle Materials Structures and Dynamics assessment and Future Directions Structural dynamics and aeroelasticity written by Ahmed Khairy Noor and published by . This book was released on 1992 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fifth volume of a six-volume monograph, the objective of which is to broaden the awareness among material scientists, engineers, and research workers about the recent developments which can impact future flight vehicles. The present volume, Volume 5, is divided into three parts. The first part h

Book Structural Dynamics and Aeroelasticity

Download or read book Structural Dynamics and Aeroelasticity written by Ahmed Khairy Noor and published by . This book was released on 1993 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Experimental Modal Analysis and Dynamic Component Synthesis Volume 4 System Modeling Techniques

Download or read book Experimental Modal Analysis and Dynamic Component Synthesis Volume 4 System Modeling Techniques written by and published by . This book was released on 1987 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report reviews the theoretical basis for the current methods used to predict the system dynamics of a modified structure or of combined structures based upon a previously determined, modal or impedance, model of the structure(s). The methods reviewed were: Modal modeling Technique: Local eigenvalue modification, Coupling of Structures Using Eigenvalue Modification, and Complex Mode Eigenvalue Modification; Sensitivity Analysis; and Impedance Modeling Technique: Building Block Approach, Dynamic Stiffness Method, and Frequency Response Method. The effects of measurement errors, modal parameter estimation error, and truncated modes in the application of modal modeling technique are evaluated. Some of the experimental modal model validation method are also presented. Several methods to normalize the measured complex modes were reviewed including both the time domain and frequency domain techniques. A new component mode synthesis method (Super element Component Dynamic Synthesis) developed by the University of Dayton Research Institute is presented in Section 5 and Appendices. A complete literature search in the area of System Modeling was performed and is listed in the Bibliography.

Book Government Reports Annual Index

Download or read book Government Reports Annual Index written by and published by . This book was released on 1988 with total page 1092 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.

Book Experimental Modal Analysis and Dynamic Component Synthesis Measurement techniques for experimental modal analysis

Download or read book Experimental Modal Analysis and Dynamic Component Synthesis Measurement techniques for experimental modal analysis written by Randall J. Allemang and published by . This book was released on 1987 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Government Reports Announcements Index

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1989 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Experimental Modal Analysis and Dynamic Component Synthesis Volume 3 Modal Parameter Estimation

Download or read book Experimental Modal Analysis and Dynamic Component Synthesis Volume 3 Modal Parameter Estimation written by and published by . This book was released on 1987 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents the area of modal parameter estimation in terms of reviewing efforts over the past twenty-five years, in developing several new multiple reference methods, and in attempting to provide a common basis and understanding for all of the modal parameter estimation methods developed to date. The review of modal parameter estimation includes a substantial literature review and the presentation of previous methods, such as the Least Squares Complex Exponential, as special cases of general methods, such as the Polyreference Time Domain method. Several new modal parameter estimation methods are developed and presented using consistent theory and nomenclature. The methods that are presented in this manner include: Polyreference Time Domain, Polyreference Frequency Domain, Multiple Reference Ibrahim Time Domain, Multiple Reference Orthogonal Polynomial, and Multi MAC. These methods, in terms of general characteristics, are also compared to other methods such as the Least Squares Complex Exponential, Ibrahim Time Domain, Eigen system Realization Algorithm, and Direct Parameter Estimation methods. These methods are all similar in that the methods involve the decomposition of impulse response functions (time domain), frequency response functions (frequency domain), or forced response patterns (spatial domain) into characteristic functions in the appropriate domain. These characteristic functions are the single degree of freedom information in the respective domain.