t1_6243_2003

t1_6243_2003 - Massachusetts Institute of Technology...

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Unformatted text preview: Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science 6.243j (Fall 2003): DYNAMICS OF NONLINEAR SYSTEMS by A. Megretski Take-Home Test 11 For each problem, give an answer and provide supporting arguments, not to exceed one page per problem. Return your test paper by 11.05 am on Friday October 17, in the classroom. Remember that collaboration is not allowed on test assignments. Problem T1.1 Find all values of µ → R for which the function V : R2 ∞� R, defined by �� � x1 ¯ V = max{|x1 |, |x2 |} ¯¯ x2 ¯ is monotonically non-increasing along solutions of the ODE � x1 (t) = µx1 (t) + sin(x2 (t)), ˙ x2 (t) = µx2 (t) − sin(x1 (t)). ˙ Hint: | sin(y )| < |y | for all y ≤= 0, and sin(y )/y � 1 as y � 0. 1 Posted October 16, 2003. Due at 11.05 am on October 17, 2003 2 Problem T1.2 Find all values of r → R for which differential inclusion of the form x(t) → � (x(t)), x(0) = x0 , ˙ ¯ 2 where � : R2 ∞� 2R is defined by x � (¯) = {f (¯ |x|)} for x = 0, x/ ¯ ¯≤ � (0) = {f (y ) : y = [y1 ; y2 ] → R2 , |y1 | + |y2 | � r}, has a solution x : [0, ∀) ∞� R2 for every continuous function f : R2 ∞� R2 and for every initial condition x0 → R2 . ¯ Problem T1.3 Find all values q , r → R for which x0 = 0 is not a (locally) stable equilibrium of the ODE ¯ x(t) = Ax(t) + B (Cx(t))1/3 ˙ for every set of matrices A, B , C of dimensions n-by-n, n-by-1, and 1-by-n respectively, such that A is a Hurwitz matrix and Re[(1 + j �q )G(j� )] > r � � → R for G(s) = C (sI − A)−1 B. ...
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t1_6243_2003 - Massachusetts Institute of Technology...

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