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Abstract Laboratory-based whole-body vibration studies often involve complex experimental designs, dozens of vibration exposures and multiple sessions. Shortening the test vibration duration would increase experimental efficiency by permitting more trials in the same time period. This study...
Abstract In the present study, we explore the effects of a lower infrasonic intensity on biological features of osteoblast-like MC3T3-E1 cells in vitro. Cells were seeded into plate at a density of 1 × 104/ml and were exposed to 100 decibel (dB) infrasonic pressures at several different...
Abstract To investigate the relationship between subjective unpleasantness and body surface vibrations induced by high-level, complex low-frequency noise, we carried out two expetiments. Body surface vibrations were measured at the right and left anterior chest and the right and left anterior...
Abstract This present paper makes a tentative study on an active isolation system which utilizes a bracket bonded with PZTs. Two big PZTs is used as actuators, and two small ones are used as sensors to detect the internal response of the Z-bracket. Accelerometers are used to detect the original...
Abstract An expansion chamber is frequently used as an acoustics silencer for the control of duct-borne noise in ventilation systems. The flow of air and the effect of sound pressure may cause the vibration of the end plates of the expansion chamber and in turn will influence the performance...
This paper presents an investigation into the development of an adaptive control mechanism for vibration suppression of flexible beam structures using genetic algorithms (GAs). The global search technique of GA is used to estimate the controller transfer function, based on one-step-ahead...
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