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A STUDY OF MODAL TESTING MEASUREMENT ERRORS, SENSOR PLACEMENT AND MODAL COMPLEXITY ON THE PROCESS OF FINITE ELEMENT CORRELATION

PUREKAR, DHANESH MADHUKAR
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1132015246

Abstract Details

2005, MS, University of Cincinnati, Engineering : Mechanical Engineering.
This thesis describes studies of finite element (FE) model validation methods for structural dynamics. There are usually discrepancies between predictions of the structural dynamic properties based on an initial FE model and those yielded by experimental data from tests on the actual structure. In order to make predictions from the model suitable for evaluating the dynamic properties of the structure, and thus to optimize its design, the model has to be validated. Model validation consists of: data requirements, test planning, experimental testing, correlation, error location and updating. This requirement for the optimum experimental data is coupled with test planning to design an optimum modal test in terms of specifying the best suspension, excitation and response locations. The Effective Independence algorithm developed by Dr. Kammer has been implemented for the optimal placement of sensors on the test structure. The assumption that the test results represent the true dynamic behavior of the structure, however, may not be correct because of various measurement errors. The errors involved in the modal testing (mass loading, sensor misalignment, modal parameter estimation, DSP errors) are investigated and their effects on estimated frequency response functions (FRFs) and on the modal parameters extracted from the FRFs are also investigated. Also, the sensitivity of these measurement errors on the correlation of the test structure is studied by comparing the experimental data with the analytical data. The correlation phase of the modal validation process also demands calculation of real modes from complex modes of the experimental test. This last topic is particularly important for the validation of FE models and for this reason; a number of different measures of modal complexity are presented and discussed in this thesis.
Dr. Randall Allemang (Advisor)
130 p.
Engineering, Mechanical
Modal testing; finite element correlation; modal complexity; mass loading of accelerometers

Recommended Citations

Citations

  • PUREKAR, D. M. (2005). A STUDY OF MODAL TESTING MEASUREMENT ERRORS, SENSOR PLACEMENT AND MODAL COMPLEXITY ON THE PROCESS OF FINITE ELEMENT CORRELATION [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1132015246

    APA Style (7th edition)

  • PUREKAR, DHANESH. A STUDY OF MODAL TESTING MEASUREMENT ERRORS, SENSOR PLACEMENT AND MODAL COMPLEXITY ON THE PROCESS OF FINITE ELEMENT CORRELATION. 2005. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1132015246.

    MLA Style (8th edition)

  • PUREKAR, DHANESH. "A STUDY OF MODAL TESTING MEASUREMENT ERRORS, SENSOR PLACEMENT AND MODAL COMPLEXITY ON THE PROCESS OF FINITE ELEMENT CORRELATION." Master's thesis, University of Cincinnati, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1132015246

    Chicago Manual of Style (17th edition)

ucin1132015246
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© 2005, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.