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Abstract The infrasonic signals (the P-t curve, the direction and horizontal velocity of the wave and the three-dimensional dynamic frequency spectrum) stimulated by seven strong earthquakes in May 2000 were introduced. The results over a year are as follows: (1) 10 days or so before the...
Abstract The delayed damper (DD) is a new active vibration absorption technique which uses time-delayed partial state feedback to generate ideal resonance on a passive vibration absorber. It has many attractive features such as real-time tunability, ease of implementation, and total suppression...
Abstract The annoyance of different low frequency noise sources was determined and compared to the annoyance from traffic noise. Twenty-two subjects participated in laboratory listening tests. The sounds were presented by loudspeakers in a listening room and the spectra of the low frequency...
Abstract The low strain test method is the prevalent method for integrity testing of cast in situ foundation piles. The automated interpretation of sonic echo traces from this test may prove beneficial to industry through standardisation of the test method and a reduction in the time spent...
In Denmark a set of guidelines for measurement and assessment of environmental low frequency noise, infrasound and vibration was published in 1997 as “Information from the Danish Environmental Protection Agency no. 9/1997” (Miljøstyrelsen2). Recommended measurement methods are specified, and...
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