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31. STUDY OF SEISMIC ISOLATION SYSTEMS FOR COMPUTER FLOORS

This report describes the development and testing of a computer floor seismic isolation systems which uses existing devices developed for the seismic isolation of buildings and shock isolation of military equipment. A computer floor system with raised floor and a generic slender equipment cabinet was constructed. It was isolated by spherically shaped sliding bearings and was highly damped either by utilizing high friction in the bearings or by installing fluid viscous dampers. The spherically shaped bearings provided the simplest means of achieving long period in the isolation system under low gravity load. The isolation system prevented rocking of the cabinet on top of the isolated floor and substantially reduced its acceleration response in comparison to that of a conventional computer floor. An analytical study was also conducted in order to extend the results to a range of parameters which could not be tested.

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12. PASSIVE AND ACTIVE FLUID DAMPERS IN STRUCTURAL APPLICATIONS

Analytical and experimental results demonstrate that the performance improvements from active control systems can also be achieved with passive and semi-active fluid dampers. However, passive or semi-active fluid dampers offer the advantages of low cost, no or minimal demand for external power, longevity and reliability.

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15. REDUCTION OF SHOCK RESPONSE SPECTRA USING VARIOUS TYPES OF SHOCK ISOLATION MOUNTS

This experiment demonstrated how various types of shock absorbers can reduce the overall shock response spectra of a structure subjected to high impact shock. This was accomplished by measuring the acceleration on a weight dropped onto three different shock absorbers from various heights and analyzing the resulting data. A baseline test was performed with a steel hard mount. This was followed by tests with three different soft isolation mounts; a half inch thick neoprene pad, a urethane rubber tube on its side and a hydraulic liquid spring type shock absorber. Results show that both the dominant frequencies and the peak acceleration get lower as the isolation system gets softer. This information can be valuable in the design of isolation systems.

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16. ROCKWELL VISCOUS DAMPER SPECIFICATIONS

This specification covers the set of ten linear fluid viscous dampers along with their mounting brackets and pins for the Rockwell Building located at Jamboree Road and Birch in Newport Beach, California. These dampers provide an output force in either tension of compression that is directly proportional to the relative velocity between the two ends of the dampers. The damper output force varies only with velocity and does not change with damper stroke position or orientation angle. The function of the dampers is to absorb earthquake energy, thereby reducing the amount the building moves when an earthquake occurs.

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