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1. 发明授权

US10222495B2 Seismic shaker 有权
公开(公告)号：US10222495B2
公开(公告)日：2019-03-05
申请号：US14896131
申请日：2014-06-04
申请人： MI-HOLDING BV
发明人： Dick Laro , Enrique Van De Groes
IPC分类号： G01V1/155 , G01V1/04
摘要： A seismic shaker for exercising an excitation force on the ground has a base plate and a reaction mass connected to the base plate via a resilient structure and an actuator parallel thereto. A first comparison unit sends a difference signal which is the difference between a displacement measured by a displacement sensor and a set value of the displacement. A control unit calculates a correction value as a function of this difference signal, and sends it to a second comparison unit, which adds the correction value to a value of the excitation force to be exerted set in the second comparison unit. This second comparison unit is connected to a controller unit which controls the actuator. At Low frequency this position control will track the ground force through the position set-point. The position feedback loop will be able to suppress the interfering force of the spring and any hysteresis.

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