Vibration isolation system

专利名称：Vibration isolation system发明人：Israel Helms申请号：US09/159123申请日：19980923公开号：US06126137A公开日：20001003

摘要：A vibration isolation system having at least three vibration isolation units. Eachof the units preferably has the same general configuration. The isolation units eachinclude a support stand having three (3) adjustable feet for adjustably supporting andleveling the isolation units on the floor of the site of operation of the precision

equipment desired to be isolated. The units further include a fluid tight cylinder. The fluidtight cylinder is connected to the support stand via three uniformly spaced rods in such afashion that allows horizontal movement of the cylinder relative to the support stand. Afluid is disposed in a chamber formed intermediate the fluid tight cylinder and thesupport stand thereby providing a thin film viscous shear damper for damping excitationshaving a horizontal component. The fluid tight cylinder is sealed by a diaphragm. A pistonis positioned directly above the diaphragm. A pair of stops limit the upward anddownward movement of the piston. A variable stiffener is positioned intermediate thelower stop and the piston to variably introduce the horizontal damper. A thin film viscousshear damper is positioned in the fluid tight cylinder for damping excitation in the verticaldirection. The vertical damper is connected to the piston via a variable stiffener such thatthe vertical damper may be completely disconnected from the piston during themeasuring stage to thereby avoid the transmission of any vertically oriented vibrations

from the floor or otherwise, to the precision instrument. A support plate is connected tothe piston for supporting at least a portion of the load of the precision machine. Theisolation unit also includes a leveling valve for maintaining the precision machine level.

申请人：ADVANCED ISOLATION SYSTEMS, LTD.

代理机构：Merek & Voorhees

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