Fault Scenario 3 Non-blocking Diode

This fault scenario considers the case that the diode does not block anymore as of t h = 0.05 s. That is, the diode acts as a resistor with a low resistance which allows for a current in both directions. Let mi (f), rri2(t) denote the control signals of 

The time history of ifi2 t) can be expressed by means of a pulse() and a unit stepO 

The pulse starts at 1 = 0 s and stops and t = ts, the unit step function jumps to the 

The state equations deduced from the bond graph in Fig. 8.12 read 

The steady state averaged values of the inductor current and of capacitor for f f3 are used as initial conditions for these state equations. Solving (8.12) for the steady state values gives (t oo) = 6 A, ucait oo) = 18 V. The numerical solution of(8.2la-8.21c)yieldsiL(f = f3+0.4ms) 9.4AandMc(f = f3+0.4ms) 1.1 V in accordance with the waveforms in Fig. 8.10. 

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