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Author: Randall J. Allemang
Publisher:
ISBN:
Category : Modal analysis
Languages : en
Pages : 274
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Book Description
Author: Randall J. Allemang
Publisher:
ISBN:
Category : Modal analysis
Languages : en
Pages : 274
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 131
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Book Description
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.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 227
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Book Description
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.
Author: Randall J. Allemang
Publisher:
ISBN:
Category : Modal analysis
Languages : en
Pages : 144
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Book Description
Author: Randall J. Allemang
Publisher:
ISBN:
Category : Modal analysis
Languages : en
Pages : 626
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 136
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Book Description
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.
Author: Randall J. Allemang
Publisher:
ISBN:
Category : Modal analysis
Languages : en
Pages : 308
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Book Description
Author: Randall J. Allemang
Publisher:
ISBN:
Category : Modal analysis
Languages : en
Pages : 454
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 153
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Book Description
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.
Author: Randall J. Allemang
Publisher:
ISBN:
Category : Modal analysis
Languages : en
Pages : 46
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Book Description
