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Important remarks on models • No mathematical model exactly represents a physical system. • Do not confuse models with physical systems! • Selecting a model close enough to a physical system and yet simple enough to be studied analytically is the most important and difficult task in control system design. • In this course, we may use the term “system” to mean a mathematical model. 2008/09 MECH468/550P 4
Model classification • Continuous-time time and discrete-time time • Memoryless, , causal and noncausal • Lumped and distributed • Time-invariant invariant and time-varying • Linear and nonlinear 2008/09 MECH468/550P 5
Page 1 and 2: MECH468 Modern Control Engineering
Page 3: Mathematical model • Representati
Page 7 and 8: Example • Continuous-time time sy
Page 9 and 10: Model classification Memoryless, ,
Page 11 and 12: Model classification • Continuous
Page 13 and 14: Example • Lumped system M Q: For
Page 15 and 16: Model classification Time-invariant
Page 17 and 18: Model classification • Continuous
Page 19 and 20: Remarks • All systems in real wor

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