What Type of Joint Will Be Tested?
The pin-joint, which permits rotation about an axis, is frequently used to connect sections of deployable space structures (see NASA Langley photo: L-95-5001). Pin-joints generally dissipate vibrations faster than other joint types, such as hard mechanical joints, primarily because the components undergo very tiny movements relative to each other. Why Fly JDX Aboard The Space Shuttle? The proper testing of the JDX structure requires an environment free from external forces such as gravity, mechanical and acoustical vibrations, and air currents. With the exception of expendable rockets, the Space Shuttle is the only vehicle available that provides the necessary test conditions. Space testing is the third phase of this four-phase experiment. The first two involved extensive measurements in the laboratory and aboard an aircraft flying maneuvers to simulate the microgravity conditions of space. In phase four, the JDX/STS-69 flight data will be analysed and significant findings published. W
