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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TL;DR: In this article, the authors developed equations of motion for a jointed structure in terms of the structural modal coordinates and implemented a reduced-order description of the microslip that occurs at the interface between components.
37 citations
TL;DR: In this article, the standard resonant column test procedure is modified to facilitate the study of wave propagation at low strains, using band-limited random noise excitation in combination with signal averaging to control the signal-to-noise ratio.
Abstract: Low-strain wave propagation velocity and attenuation are effective measures of state in particulate media. The standard resonant column test procedure is modified to facilitate the study of wave propagation at low strains. The system uses band-limited random noise excitation in combination with signal averaging to control the signal-to-noise ratio. This procedure is efficiently implemented by replacing typical peripheral devices with a signal analyzer and computer control. The methodology permits testing at very low strains. The effect of non-linear system response on computed transfer functions is addressed. Other results include the analytical treatment of coupling between torsional and transverse modes, the evaluation of local low-strain shear parameters from solid specimens tested in torsion, and the use of multi-mode testing for the evaluation of field parameters.
37 citations
TL;DR: A multipoint laser vibrometer that is capable of high spatial and temporal resolution with simultaneous measurement of 256 points along a line at up to 80 kHz is described.
Abstract: Experimental modal analysis of multifrequency vibration requires a measurement system with appropriate temporal and spatial resolution to recover the mode shapes. To fully understand the vibration it is necessary to be able to measure not only the vibration amplitude but also the vibration phase. We describe a multipoint laser vibrometer that is capable of high spatial and temporal resolution with simultaneous measurement of 256 points along a line at up to 80 kHz. The multipoint vibrometer is demonstrated by recovering modal vibration data from a simple test object subject to transient excitation. A practical application is presented in which the vibrometer is used to measure vibration on a squealing rotating disk brake.
37 citations
TL;DR: In this article, a deflection monitoring system for wind turbine blades is proposed, which is composed of an estimation algorithm to detect blade deflection and a wireless sensor network as a hardware equipment.
36 citations
TL;DR: In this article, an experimental investigation carried out on square and rectangular plates with various boundary conditions to determine the damping ratios for a few modes of vibration is reported, based on the experimental findings, the Rayleigh damping coefficients can be computed for subsequent use in the modal superposition technique.
36 citations