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 paper, various excitation methods are proposed for the effective use of complex modal testing for rotating machinery, based on the input/output relationships for complex signals, for the direct or indirect assessment of frequency response and coherence functions between complex inputs and outputs.
29 citations
TL;DR: In this paper, the use of pneumatic excitation using an impinging air jet is proposed as an alternative for modal analysis of a cantilevered beam and a vibration test of a hard disk.
29 citations
TL;DR: In this article, a modal analysis of thin aluminium (Al 99.9) isotropic plate with dimensions 0.10 × 0.002 m was carried out numerically in the ANSYS program.
29 citations
TL;DR: In this paper, an active vibration control of pultruded fiber-reinforced polymer (FRP) composite thin-walled I-beams using smart sensors and actuators is presented.
Abstract: Advanced and innovative materials and structures are increasingly used in civil infrastructure applications. By combining the advantages of composites and smart sensors and actuators, active or smart composite structures can be created and be efficiently adopted in practical structural applications. This paper presents results on active vibration control of pultruded fiber-reinforced polymer (FRP) composite thin-walled I-beams using smart sensors and actuators. The FRP I-beams are made of E-glass fibers and polyester resins. The FRP I-beam is in a cantilevered configuration. The PZT (lead zirconate titanate) type of piezoelectric ceramic patches are used as smart sensors and actuators. These patches are surface bonded near the cantilevered end of the I-beam. Utilizing results from modal analyses and experimental modal testing, several active vibration control methods, such as position feedback control, strain rate feedback control and lead compensation, are investigated. Experimental results demonstrate that the proposed methods achieve effective vibration control of FRP I-beams. For instance, the modal damping ratio of the strong direction first bending mode increases by more than 1000% with positive position feedback control.
29 citations
TL;DR: In this paper, a mass normalized mode shape expansion and subsequent physical parameter identification for shear-type structural systems with input-output measurements is investigated, and the issue of global identifiability of the system is also addressed vis-a-vis instrumentation set-ups.
29 citations