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, a modal test using active members as the excitation source has been performed on the Precision Truss using the step sine testing technique, the frequency response functions are obtained and the modal parameters are extracted by the curve-fitting method.
Abstract: A modal test using active members as the excitation source has been performed on the Precision Truss. Using the step sine testing technique, the frequency response functions are obtained and the modal parameters are extracted by the curve-fitting method. Total of 10 global modes and 3 local modes are obtained. The results are compared with those obtained by the conventional external excitation test.
15 citations
08 Jun 2020
TL;DR: FlockLab 2, a second generation testbed supporting multi-modal, high-accuracy and high-dynamic range measurements of power and logic timing and at the same time in-situ debug and trace infrastructure of modern microcontrollers allowing for reproducible evaluation and benchmarking is presented.
Abstract: The development, evaluation, and comparison of wireless IoT and cyber-physical systems requires testbeds supporting inspection of logical states and accurate observations of physical performance metrics. We present FlockLab 2, a second generation testbed supporting multi-modal, high-accuracy and high-dynamic range measurements of power and logic timing and at the same time in-situ debug and trace infrastructure of modern microcontrollers allowing for reproducible evaluation and benchmarking. We detail the architecture, provide a characterization and demonstrate the interface, the supported services and the tools of the FlockLab 2 testbed. Data Availability Statement. The hardware design and the software for server and observer of the presented testbed architecture and the data for the plots in this paper are openly available at XXX.
15 citations
01 Jan 1988
TL;DR: In this paper, step-relaxation and wind were used to excite a wind turbine with four modal frequencies below 1.0 Hz for a modal test of a 110 m tall EOLE wind turbine.
Abstract: Modal Testing of immense and very flexible structures poses a number of problems. It requires innovative excitation techniques since the modal frequencies of these stuctures can be quite low. Also, substantial energy must be input to the structure to obtain reasonable levels of response. In this paper, results are presented from a modal test of the 110 m tall EOLE wind turbine which had four modal frequencies below 1.0 Hz. Step-relaxation and wind were used to excite the structure. 5 refs., 14 figs., 2 tabs.
15 citations
TL;DR: In this article, a finite element procedure, which includes geometric stiffening, and centrifugal and Coriolis terms resulting from the use of a rotating coordinate system, has been developed to compute the mode shapes and frequencies of rotating structures.
15 citations
TL;DR: In this article, the modal power flow of an undamped beam at resonance was studied and two typical damages, transverse cracks and delaminations, were considered and compared with the damage indices based on the slope, the bending strain, and the strain energy through numerical examples.
15 citations