on re v e r se s id e if n e c e s s a r y and id e n tify by b lo c k num ber) A B S T R A C T (C o n t in u e on r e v e r se s id e if n e c e s s a r y and id e n tify by b lo c k num ber)Recent progress in the use of singular perturbation and two-time-scale methods of modeling and design for control systems is reviewed. Over 400 references are organized into major problem areas. Representative issues and results are disucssed with a view to outlining research directions and indicating potential areas of application. The survey is aimed at engineers and applied mathema ticians interested in model-order reduction, separation of time scales and allied simplified methods of control system analysis and design.The exposition does not assume prior knowledge of singular perturbation methods. DD , jan^73 1473 S E C U R IT Y C L A S S I F IC A T IO N o f T h i s P A G E 'W h en D a re E n te r e d ) S E C U R IT Y C L A S S I F IC A T IO N o f T H IS PA G EfW han Data E n te re d ) S E C U R IT Y C L A S S IF IC A T IO N O F T H IS PAGEfWTian Data E n f r « d ) SINGULAR PERTURBATIONS AND TIME-SCALE METHODS IN CONTROL THEORY

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