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Abstract Starting from numerical models which are used in engineering, it is shown that it is possible to bring to light the main features which are responsible for the generation of self-sustained tones in turbulent flows. The numerical study is based on our experimental results. The set-up...
Abstract Despite the benefits of HVAC equipment, this can produce structure-borne sound as well as air-borne sound. This sometimes causes vibration of the electrical and mechanical services (E&M) roof or floor that is high enough to make the spaces they serve unusable. Therefore, good acoustical...
Abstract An open-loop control strategy for vibration suppression of a flexible manipulator system using genetic algorithms is presented in this paper. This consists of developing suitable forcing functions so that the dominant vibration modes of the system are not excited and hence the system...
Abstract In this paper we study the changes and significance of the TXA2 and PGI2 metabolism after infrasonic damage to rats so as to probe the mechanism of infrasonic biological effects. Some 40 SD rats were randomized into control, infrasonic damage once, 7 times, 14 times, and treatment five...
Recently, complaints about low frequency noise are increasing in Japan. In Inter-Noise ′99, Ochiai has reported the following three kinds of evaluation methods for effects caused by infra and low frequency noise. An evaluation for rattling of doors or windows. An evaluation for psychological and...
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