space of the concept of two-dimensionally deployment and retrieval. This is the most important purpose of the experiment, because it is very difficult to achieve a “zero g“ ground simulation test which is mandatory for 1-D deployable arrays. For the deployment and retrieval of the system both the simultaneous and sequential operation of a blanket and masts are possible. Two examples for simultaneous blanket and masts deployment are shown in Fig. 13. The measurement items and their instruments of this test are as follows: • general aspects (VTR); • mast deployment speed (potentiometers, Laser radar); • blanket stress (strain gauges); • cable tension (load cells); • motor power (volt meters); • mast deflection (Laser radar, accelerometers); • blanket deformation (Laser radar, VTR); • response of flyer unit (attitude sensor, accelerometers). Vibration Test Vibration testing is planned to study the structural dynamics of the 2-D array system in orbit and to evaluate various identification methods for modal parameters. The array is excited through the injection of the flyer unit thrusters. The measurement items and their instruments of this test are as follows: • deflection (VTR or Laser radar, optical followers); • acceleration (low-frequency accelerometer); • tension (load cells); • temperature (infrared camera). Control Test The control test of the 2-D array system will provide us various inherent characteristics of flexible large planar structures. The test includes the load measurements, Fig. 14. Operational sequence of tests.
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