Dasd with spindle imbalance isolation and method for producing same

Abstract

An apparatus (and a method for producing the same) for preventing internal vibrations produced as a result of rotary motion at a predetermined frequency within a device mounted in an enclosure from being translated into resulting rotary motion of the device comprises n vibration isolation mounts located between the device and the enclosure, said vibration isolation mounts having stiffness characteristics and being positioned so that rotational motion of the device at the frequency of the rotary motion is eliminated. The vibration isolation mounts are arranged and configured so that when the rotary motion produces linear and rotational forces, the net moment of all forces about the center of gravity of the device is equal to zero. The vibration isolation mounts may be isotropic. The isolation mounts may have different stiffness's. Three or more mounts may be used. Alternatively, the vibration isolation mounts may have the same stiffness's but their positions may be varied. An additional mass may be added to change the location of the center of gravity of the device. The vibration isolation mounts are preferably comprised of a material which provides damping of approximately ten percent of critical damping.