SPACE LAUNCH VEHICLE FULL-SCALE DAMPING TESTS
GENERAL DYNAMICS/ASTRONAUTICS SAN DIEGO CA
Pagination or Media Count:
The wind study portion of testing showed that the SLV gantry tower is sufficiently stable to be used as a base for forced oscillation of the vehicle and that any measurement of relative motion between the vehicle and tower is of vehicle movement only. The structural damping ratio of the first cantilever mode of Atlas Agena 461 and 698 BJ varied between a high of 2.14 percent and a low of 0.57 percent, depending upon the axes and the tanking condition. It was not possible to determine a damping factor for all cases by the methods used because of the internal liquid movements, but for many conditions damping factors were determined with good accuracy. In general the theoretical frequencies were verified to an excellent degree. The experimental damping factors agreed reasonably well with the results of previous tests. Increased confidence in the recent SLV ground wind restrictions has been the direct result of this test.
- Unmanned Spacecraft