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Shaking Table Can Excite The Flexible Modes

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Holman is a world recognised manufacturer and supplier of gravity separation tables to the mining minerals and metals/plastics recycling industries. A dedicated team of engineers experienced in mineral processing understand the requirements of modern, environmentally driven process operations – and when gravity concentration is still a preferred separation route – Tables remain an economic and user friendly option to achieve the required concentration performance.<a  data-cke-saved-href=shaking table' align='left' width='330' />

Specifically designed to recover gold from alluvial or hard rock deposits, upgrading and recovery of gold from concentrates from other gravity separation stages, exploration and evaluation of gold deposits ,and other mineral applications for tin, tungsten and scheelite. A computer system is used to control the motion of the table. The system enables researchers to input any one of more than one thousand earthquake records into the table and simulate vibrations of actual past earthquakes.

The stage rides on two ground-hardened metal shafts using linear bearings, which allows for smooth linear motion with low path deflection. The stage has a total travel of 15.24 cm. In addition, researchers can create their own earthquake as well as test anything beyond existing recordings on the Richter scale.

The Shake Table’s motor is a 400W high-powered 3-phase brushless DC actuator. The motor contains an embedded high-resolution encoder that allows the position of the stage to be measured with an effective linear resolution of 3.1 μm. An analog accelerometer mounted on the Shake Table II platform measures the acceleration of the stage directly. As a typical application, the Shake Table II can excite the flexible modes of a tall structure in order to design, implement, and evaluate a control system to manipulate and dampen the structural vibrations.

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asked Nov 28, 2014 in Science by anonymous
    

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