Abstract
Today's economic climate demands that conversion of military technology for commerical applications be a part of an aerospace and defense company's strategic planning. Toward this goal, a successful defense conversion has occurred recently with the application of high capacity fluid damping devices from the defense community for use as seismic energy dissipation elements in commercial buildings, bridges, and related structures. These products have been used by the military for many years for attenuation of weapons grade shock, typically applied to shipboard equipment or land based strategic weapons. Commercial energy dissipation devices historically have involved heavy yielding sections or hysteretic joints.
Highlights
Fluid damping devices have been used to improve and modify the performance of military equipment, most often to attenuate the effects ofweapon's grade shock and blast effects
At speeds above 2 in.!s, the cyclic test actuator was reaching its maximum acceleration capacity, the first cycle was driven overspeed with a nonlinear command
The use of high capacity energy dissipation devices in buildings and bridges requires that testing be performed at full scale force and velocity levels
Summary
Fluid damping devices have been used to improve and modify the performance of military equipment, most often to attenuate the effects ofweapon's grade shock and blast effects. Applications, specifications, and designs associated with defense and aerospace use of fluid damping technology have not been publicized, save for occasional article distributed within this community. A commercial application contemplated for this technology is to use fluid damping devices within building and bridge structures to attenuate the shock loadings associated with earthquakes. An additional problem involves the test methods and procedures that can be utilized to test full sized hardware. Fluid damping devices for building and bridge use are relatively large , having output forces in the range of 100 ,000-2 ,000 ,000 Ib per device.
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