Electrical Engineering ⇒ Topic : Fluid Friction Damping
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David
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Fluid friction damping. In this method, discs or vanes attached to the spindle of the moving system are kept immersed in a pot containing oil of high viscosity See Fig. (a). As the pointer moves, the friction between the oil and vanes opposes the motion of the pointer and thus necessary damping is provided. This method is not used because of several disadvantages such as objectionable creeping of oil, the necessity of using the instrument always in the vertical position and its unsuitability for portable instruments. In general, fluid friction damping is not employed in indicating instruments, although one can find its use in Kelvin electrostatic voltmeter
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Mason
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Fluid Friction Damping There is similarity between fluid friction damping and air friction damping except that oil is used in place of air in case of fluid friction damping. Since viscosity of oil is greater, the damping force is also correspondingly greater. Figure (a) shows the fluid friction damping.
figure (a) The fluid friction damping has the following advantages:
This type of damping is used only for vertical type instruments. | |
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