ISSUES! 0 SIGNIFICANCE OF MODCLING ERRORS ON PERFORMANCE IS A KEY ISSUE FOR CONTROL SYSTEM ANALYSIS t DESIGN o TRADEOFFS AMONG ACTIVE SURFACE CONTROL MAY LEAD TO MORE EFFICIENT DESIGN (POTENTIAL DYNAMIC/M1CROWAVE PHASING INTERACTION) o SPECIFIC CONTROLS HARDWARE MAY IMPACT OVERALL DESIGN o STRUCTURE, CONTROL t MATERIALS DESIGN AND DEVELOPMENT SHOULD BE CARRIED ON IN PARALLEL WITH ADEQUATE COOPERATION, COWUNI CAT I ON AND FUNDING. CONTROL HAS NOT RECEIVED APPR0P1ATE ATTENTION ffIQtMALIONii o BETTER MATHEMATICAL METHODS NEED DEVELOPMENT FOR ROBUST CONTROL POLICIES o MORE ATTENTION TO ORBITAL VERIFICATION OF CONTROLLED SYSTEM e TRADE PASSIVE STRUCTURE/ACTIVE FIGURE CONTROL/ELECTRONIC PHASING (IMPACT MATERIAL, CONFIGURATION, RISK) 0 CAREFUL STUDY OF ACTUATOR, SENSOR OPTIONS FOR IMPROVED CONTROL PERFORMANCE • GREATER ATTENTION NEEDED ON CONTROL PROBLEM FIGURE 5 - CONTROL SYSTEM ANALYSIS/DESIGN ISSUESi o LACK OF EXPERIENCE WITH SYSTEMS OF THIS TYPE MERITS CAREFUL CONSIDERATION o MODELING AND CONTROL OF TRANSIENT PROPERTIES o EFFECT OF THERMAL DEFORMATIONS ON ASSEMBLY BECfltODALIONS: 0 CONTROL UNDER CONSTRUCTION SHOULD BE ADDRESSED o CONTROL THEORIES MUST BE DEVELOPED TO ACCOUNT FOR GROSSLY CHANGING PLANT • STUDY OF STRUCTURES WITH MINIMUM REDUNDANCE • ALTERNATE MEANS FOR HANDLING THERMAL DISTORTION BESIDES LOH CTE MATERIAL SHOULD BE STUDIED FIGURE 6 - CONSTRUCTION IN SPACE ISSUESi o CURRENT FAVOR OF COMPOSITES MAY ULTIMATELY BE CORRECT BUT MUCH ADDITIONAL WORK REQUIRED TO MAKE THIS DECISION WITH CONFIDENCE o LONG TERM STABILITY OF MATERIALS IN SPACE ENVIRONMENT o DESIGN/STRUCIURE/MATERIAL TRADEOFFS OtMHQllS: o INVESTIGATE DESIGN SOLUTIONS TO EASE MATERIAL REQUIREMENTS (INCLUDING THERMAL CONTROL) 0 EXPLORE USE OF OTHER MATERIALS SINCE COMPOSITES ARE RELATIVELY NEW o DEVELOP PROCEDURES TO EXTRAPOLATE PERFORMANCE TO LONG LIFE (INCLUDING FATIGUE, THERMAL CYCLING, ENVIRONMENTAL EXPOSURE AND COMBINED EFFECTS) o DEVELOP AUTOMATED FABRICATION OF STRUCTURAL ELEMENTS FOR GROUND SIMULATION; STRUCTURAL CHARACTERIZATION OF PRODUCTS • ADDRESS THERI1AL/MATERIAL PROBLEMS FIGURE 7 - STRUCTURAL MATERIALS ISSUESi o SPS DESIGN AND DEVELOPMENT WILL DEPEND STRONGLY ON ANALYSIS AND MODELING 0 MATERIAL PERFORMANCE/LIFE REQUIRES DATA BFCOMFNDATIONS; o DEVELOP EXPRIMENTAL APPROACHES FOR VERIFICATION OF ANALYSIS AND MODELING (GROUND AND FLIGHT) o CHARACTERIZE LIMITATIONS OF GROUND TESTING AND FLIGHT SCALE TESTING (CAN LEO TEST VERIFY FULL SCALE SYSTEM STABILITY?) o DEVELOP SIMULATION CAPABILITY FOR APPLICATION TO EXPERIMENTS • PLAN SCALE PROOF OF PRINCIPLE TESTING WHICH IS TECHNICALLY TRACEABLE TO FULL SCALE • DEVELOP MATERIALS EXPERIMENTS FIGURE t - EXPERIMENTS
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