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    Tank pressure control with vaccum and N2 : two transfer functions ?

    Hello all ! I know how to determine a transfer function. I open the valve completely (heaviside step function) and I can take the 63% of the max for tau, the maximum of the output is K, and for an order 1 I have K/(tau*s+1). This is for order 1. Order 2 and more I learnt at the uni a method...
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