Topic
Modal testing
About: Modal testing is a research topic. Over the lifetime, 4047 publications have been published within this topic receiving 64772 citations.
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01 Feb 1998
TL;DR: In this article, a structural modification using experimental frequency Response Functions (SMURF) was proposed to correct the mass cancellation effects caused by a transducers at the driving point. But the mass cancelling technique for transducers in modal testing has not been solved for a long time.
Abstract: The mass cancellation technique for transducers at the driving point has been solved for a long time However, there are few publications about quantification of the mass-loading effects caused by a measuring transducer on FRFs at the non-driving points This article revisits the problem of mass cancellation in modal testing and proposes a general solution based upon a direct substructuring technique, Structural Modification Using experimental frequency Response Functions (SMURF) It is shown that for the non-driving points, the FRFs can be corrected if the measurement is repeated with an accelerometer of different mass It is also shown that the driving point FRF of the response point can be obtained by the same measurement A similar procedure is used to correct the suspension effects on the test structure For the case that the structure is suspended with one spring, it is proved that for all of the points of the structure, the FRFs can be corrected if the measurement is repeated with two other springs with different stiffness To demonstrate the validity of the method for correction of mass-loading effects a system of 12 degree of freedom of masses, springs and dampers was considered The method is exact but in practical situations may be vulnerable to noise Noise has been considered in the measured FRFs and a way to prevent error in the calculation has been investigated
36 citations
TL;DR: In this article, a comparative overview of the disciplines of modal testing used in structural engineering and system identification used in control theory is presented, and a list of representative references from both areas is given.
Abstract: A comparative overview is presented of the disciplines of modal testing used in structural engineering and system identification used in control theory. A list of representative references from both areas is given, and the basic methods are described briefly. Recent progress on the interaction of modal testing and control disciplines is discussed. It is concluded that combined efforts of researchers in both disciplines are required for unification of modal testing and system identification methods for control of flexible structures.
36 citations
TL;DR: In this article, a time-domain technique for identifying modal parameters of test specimens based on the log-decrement method is presented, which is applied to a polymethyl methacrylate (PMMA) beam for complex modulus identification.
36 citations
TL;DR: In this paper, the main results of the serviceability assessment of a steel suspension footbridge, performed through dynamic testing and numerical simulations, are summarized. But, the performance of the footbridge exhibited quite complex dynamic characteristics (i.e. two couples of closely spaced modes and five modes in the frequency range 1.9-3.0 Hz).
36 citations
TL;DR: In this article, the authors explore the generation of two-dimensional steady-state flexural waves that are non-reflective on a thin rectangular plate with free boundary conditions when excited by two macro-f...
Abstract: The present work explores the generation of two-dimensional steady-state flexural waves that are non-reflective on a thin rectangular plate with free boundary conditions when excited by two macro-f...
36 citations