LIST OF FIGURES Figure No. Page 1 Design Principles for a Satellite Solar Power Station 6 2 Nominal Orbit Perturbations 7 3 SSPS Dimensions 10 4 Atmospheric Attenuation of Microwaves in Two United States Locations 13 5 Hypothetical Distributions of Microwave Power Density from the Beam Center 15 6 Potential SSPS Power Levels 18 7 SSPS Characteristics 20 8 Solar Collector Configuration 21 9 SSPS Baseline Configuration 22 10 Construction of Compression Strut 25 11 SSPS Disturbance Forces and Torques 31 12 SSPS Deflections and Member Loads for Unit Control Forces Acting in the Y Direction 33 13 SSPS Deflections and Member Loads for Unit Control Forces Acting in the Z Direction 34 14 SSPS Natural Frequencies Versus Modulus of Elasticity of Non-Conductive Struts 37 15 SSPS Natural Frequencies Versus Modulus of Elasticity of Non-Conductive Struts 37 16 Pitch Axis 40 17 First Symmetric Pitch Axis Bending Mode Shape 43 18 First Anti-Symmetric Pitch Axis Bending Mode Shape 43 19 Second Symmetric Pitch Axis Bending Mode Shape 43 20 Second Anti-Symmetric Pitch Axis Bending Mode Shape 43 21 Digital Simulation of Pitch Axis Flexible Body Dynamics for a 4100 Ft.-Lb. Constant Disturbance Torque 46 22 Digital Simulation of Pitch-Axis, Rigid-Body Dynamics for a 4100 Ft.-Lb. Constant Disturbance Torque 46 23 Variation of the 1st Anti-Symmetric Pitch Mode Frequency with Attitude Error 47 24 Variation of the 1st Anti-Symmetric Pitch Mode Frequency with Attitude Error 47 25a Variation of the 1st Anti-Symmetric Pitch Mode Frequency with Response Time 48 25b Variation of the 1st Anti-Symmetric Pitch Mode Frequency with Response Time 48 26 Variation of the 1st Anti-Symmetric Pitch Mode Frequency with Steady-State Control Force 49 27 Variation of the 1st Anti-Symmetric Pitch Mode Frequency with Control System Gain 49
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