(U) The Space Vehicles Structures and Controls Thrust addresses two primary technology sub-areas: Advanced Structural Components (ASC) and Structural Control & Vibration Damping (SCVD).
(U) ASC's near- and far-term goals are baselined from 1996's state-of-the-art capabilities:
1. (U) Satellite structural subsystems that average 20 percent of the overall mass and account for 13 percent of total cost,and
2. (U) Launch vehicle structural subsystems that averages less than14 percent of the overall mass and account for 30 percent of total cost.
(U) ASC's near-term goals (by year 2001) are to: reduce satellite structural mass by 40 percent and reduce cost by more than 10 percent; reduce launch vehicle structural subsystem cost by 25 percent. ASC's far-term goals (year 2011) are to: reduce satellite structural mass by 75 percent and reduce cost by more than 25 percent, and reduce launch vehicle structural subsystem cost by a factor of 10.
(U) SCVD's near- and far-term goals are also baselined from 1996's state-of-the-art capabilities:
1. (U) Subsystems requiring precision pointing are hard-mounted to satellites and must live with spacecraft disturbances as part of their error budget resulting in degraded performance. On a case by case basis, attempts have been made to passively isolate either the
disturbance source or the payload;
2. (U) Phillips Lab demonstrated a 1000:1 disturbance attenuation for large space-based laser systems using system level isolation between the telescope and the laser and 100:1 improvement in farfield line of sight using active structural control of the telescope; and
3. (U) Satellites launched on Medium Launch Vehicles (MLVs) such as Delta II are subjected to pseudo-static loads + 2.5 gs (axial) and dynamic loads of + 3.0 gs (lateral) and + 0.6 gs (axial) at the separation plane during launch and must be designed to survive these loads.
(U) SCVD's near-term goals (by year 2001) are to: decrease dynamic launch loads to which a satellite is subjected by a factor of five, reduce pyrotechnic-shock to which satellites are subjected by more than two orders of magnitude, and to decrease on-orbit disturbances experienced by payloads by a factor of 10. SCVD's far-term goals (year 2011) are to: decrease dynamic launch loads to which a satellite is subjected by a factor of 20, and decrease on-orbit disturbances experienced by payloads by a factor of 100.
| Name | Title |
|---|---|
| Dynamic Systems | Dynamic Systems |
| Space Power | Space Power |
| Structural Systems | Structural Systems |
| Name | Title |
|---|---|
| Space and Missile Technology | Space and Missile Technology |
| Name | Title |
|---|---|
| TECHNOLOGY- RDT&E | SPACE TECHNOLOGY |
(U) None.
(U) 21 November 1997
(U) Road Map Production Date: 18 June 2001