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Experimental Investigation of Vibratory Pile Driving in Saturated Sand
2017An experimental study using half-model tests to investigate the vibro-penetration of piles in saturated sand is presented. In the tests, a model pile with half-circular cross section is penetrated along an observation window by means of a vibrator. The use of a high speed camera and a sophisticated image acquisition system enables the observation of ...
Vogelsang, Jakob +2 more
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Soil resistance during vibratory driving in sand
Proceedings of the Institution of Civil Engineers - Geotechnical EngineeringA mechanism to explain pile shaft resistance during vibratory driving is discussed. One hypothesis is that horizontally oscillating stresses temporarily reduce shaft resistance. Vibration measurements were conducted in medium-dense to dense sand during vibratory driving. A large compaction probe was installed by a vibrator with variable frequency. The
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Design on the Driving Mode of MEMS Vibratory Gyroscope
2008Driving mode of MEMS (Micro-Electro-Mechanical Systems) Vibratory Gyroscope is discussed in the paper. We analyze the closed-loop circuit of MEMS gyroscope from two aspects of amplitude fixed and frequency locking. In the amplitude fixed circuit, Automatic Gain Control (AGC) circuit is employed to update the amplitude of the driving force, together ...
Ranran Yi, Bangcheng Han, Wei Sheng
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