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Title: Techniques for the determination of vibration transmission mechanisms in structures
Author: Pavic, G.
ISNI:       0000 0001 3479 1945
Awarding Body: University of Southampton
Current Institution: University of Southampton
Date of Award: 1976
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The first part of this work deals with signal propagation characteristics in both nondispersive and dispersive media. Those characteristics are examined on the basis of signal coherence at two different points along propagation paths. In propagation along nondispersive paths, coherency is achieved by characteristic lag-time shifting and cross-correlation analysis is used. It is shown that the influence of noise in cross-correlation analysis can be made insignificant in the majority of cases by planning the measurements appropriately. For dispersieve paths in which the coherence of the travellilng signal is degraded along the path conventional cross-correlation ceases to be useful as a method of analysis; it is shown that in this case the coherence between the signals at two different points can be restored by the application of a transformation procedure to the spectra of the signals. Part two concerns power (intensity) flow measurements in flexural waveguides and homogenous flat plates with the objective of formulating procedures and techniques for practical power transmission measurements. The finite difference approach was chosen for obtaining spatial derivatives of kinematical quantities relevant to power flow determination. The accuracy of the method and the effects of noise are discussed. It is shown that meaningful measurement of power flow is possible. Criteria, based on the theoretical analysis, are provided for the choice of test parameters. Simpler measurement methods applicable in some special cases are formulated and the conceptual design of analogue electronic measuring devices is given in each case. In the third part, conclusions derived from the results of the two previous parts are made in the form of a discussion of the applicability of the methods described and recommentdations for future work are given.
Supervisor: White, R. G. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: TA Engineering (General). Civil engineering (General)