FIGURE 1 - SPS STRUCTURES I CONTROL WORKSHOI FIGURE 2 - WORKSHOP OBJECTIVES I FINDINGS FIGURE A - STRUCTURAL DESIGN FIGURE 3 - MODELING/DYNANIC ANALYSIS OF THE UNCONTROLLED SYSTEM OBJECTIVES: o ASSESS I CRITIQUE ASSUMPTIONS, METHODOLOGIES I CONCLUSIONS OF EXISTING SPS STUDIES IN THE AREAS OF STRUCIUAL DYNAMICS I CONTROL ( STRUCTURAL DESIGN I MATERIALS ALSO CONSIDERED ) o IDENTIFY CRITICAL ISSUES IN THESE AREAS AND MAKE RECOMMENDATIONS FOR FUTURE WORK SUMMARY OF FINDINGS: 0 GENERALLY OPTIMISTIC THAT WITH SUFFICIENT RESOURCES TECHNICAL KNOW-HOW THAT HAS SERVED US IN THE PAST WILL FIND WAYS TO MEET SPS CHALLANGES. BUT WORK TO DATE HAS NOT PENETRATED ENOUGH TO PROVIDE REAL CONFIDENCE IN THE ULTIMATE VIABILITY OF SPS FROM THE STANDPOINT OF STRUCTURES AND CONTROLS. WORK REQUIRED IN: • MODELIMS - DEVELOPING TECHNIQUES FOR ACTIVE CONTROL OF INCERTAIN SYSTEMS - STUDY OF LONG TERM PROPERTIES OF COMPOSITES SPS STRUCTURES t CONTROL WORKSHOP AT NASA, JSC JANUARY 22, 23, 1980 CHAIRMAN: D. L. MINGORI - UNIVERSITY OF CALIFORNIA, L, A. PANEL MEMBERS: K. T. ALFRIEND - NAVAL RESEARCH LABS R. G. LOEWY - RENSSELAER POLYTECHNIC INSTITUTE M. LYONS - LOCKHEED RESEARCH LABS S, SELTZER - CONTROL DYNAMICS COMPANY R. E, SKELTON -PURDUE UNIVERSITY K. SOOSAAR - C. S. DRAPER LABS ISSUE: SUCCESSFUL DESIGN t OPERATION OF SPS WILL RELY HEAVILY ON MODELING I DYNAMIC ANALYSIS immuoiis: o ADEQUATE MODAL ANALYSIS WILL REQUIRE DEVELOPMENT OFi - HIGHER ACCURACY FINITE ELEMENTS - IMPROVED EIGENVALUE EXTRACTION - CAREFUL ANALYSIS OF ERROR SOURCES o NEED BETTER UNDERSTANDING OF HOW MODELING CRITERIA AFFECT RELIABILITY OF MODE SHAPES, FREQUENCIES o ENVIRONMENTAL DISTURBANCE, i CONTROL HARDWARE MODELING REQUIRED FOR DYNAMIC PERFORMANCE t CONTROL SYSTEM DESIGN • EXTEND FINITE ELEMENT* ANALYSIS TO INCLUDE NON-LINEAR BEHAVIOR FOR, E6. - POTENTIAL LARGE SOLAR BLANKET DEFLECTIONS - NEAR BUCKLING MEMBER BEHAVIOR ISSUES: 0 PANEL CONSENSUS SUPPORTED STRUCTURAL FEASIBILITY 0 CONCERN EXPRESSED AS TO WHETHER THE EXPECTED LOW STRUCTURAL MASS FRACTION IS BASED ON A REALISTIC STRUCTURAL CONCEPT AND PROPER ANALYSIS RECQMFNDATIOKS: o EXPLORARATION OF MORE ADVANCED CONCEPTS WHICH UTILIZE FULL POTENTIAL OFFERED BY NEARLY BENIGN ENVIRONMENT 0 MORE COMPREHENSIVE STRUCTURAL ANALYSES INCLUDING CONTROL ACTUATORS AND TRANSIENT, NON-UNIFORM THERMAL ENVIRONMENT
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