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In this paper, finite periodical structures with tunable intermediate supports and boundaries are studied from wave standpoint. The effects of length of bay, number of bays, boundaries and intermediate supports on the dynamic characteristics of a finite periodical structure are examined through parametric studies. This study offers some guidelines in the design of tunable finite periodical structures for vibration suppression purposes. Periodical structures form an important part of practical engineering structures, such as multi-story buildings, elevated guideways for high speed transportation vehicles, multi-span bridges and chemical pipelines, just to name a few. It was found that a periodical structure acts as a band pass filter to broad frequency band vibrations. However, once a periodical structure is built, the propagation and attenuation zones are fixed. This is undesirable under situations when the excitational frequencies vary. In this study, a tunable periodical structure is proposed from wave standpoint. In terms of waves, vibrations propagating along a waveguide are reflected and transmitted upon discontinuities and boundaries. The propagation is governed by the so-called propagation matrix, and the reflection and transmission by the reflection and transmission matrices. Tunable periodical discontinuities can then be created for adjusting the propagation and attenuation zones for vibration suppression purposes. 1
In this paper, finite periodical structures with tunable intermediate supports and boundaries are studied from wave standpoint. The effects of length of bay, number of bays, boundaries and intermediate supports on the dynamic characteristics of a finite periodical structure are examined through parametric studies. This study offers some guidelines in the design of tunable finite periodical structures for vibration suppression purposes. Periodical structures form an important part of practical engineering structures, such as multi-story buildings, elevated guideways for high speed transportation vehicles, multi-span bridges and chemical pipelines, just to name a few. It was found that a periodical structure acts as a band pass filter to broad frequency band vibrations. However, once a periodical structure is built, the propagation and attenuation zones are fixed. This is undesirable under situations when the excitational frequencies vary. In this study, a tunable periodical structure is proposed from wave standpoint. In terms of waves, vibrations propagating along a waveguide are reflected and transmitted upon discontinuities and boundaries. The propagation is governed by the so-called propagation matrix, and the reflection and transmission by the reflection and transmission matrices. Tunable periodical discontinuities can then be created for adjusting the propagation and attenuation zones for vibration suppression purposes. 1
Vibration suppression through tunable periodical structures
Schwingungsunterdrückung durch abstimmbare, periodische Strukturen
Mei, C. (author)
2005
8 Seiten, 9 Bilder, 4 Quellen
Conference paper
Storage medium
English
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