We start from the dynamic equations of the comprimating systems (Greitzer-1976) and we make a nondimensionalizing the mass flow rate, the pressure and the time to obtain the nondimensional governing equations. To analyse the stability we apply the Routh Hourwitz criterion and we determin the useful stability range for compressor stability. We propose an interesting concept of dynamic stabilizat...

This work deals with the use of Generalized Predictive Control (GPC) with fractional order plants. Low integer–order discrete approximations will be used as models to design the controllers. The stability and robustness of the closed loop system will be studied with the Nyquist criterion. Three techniques will be proposed to enhance robustness: the improvement of the model response at low frequ...

We study the resolvent equation associated with a linear operator L arising from the linearized equation for perturbations of a steady Navier–Stokes flow U∗. We derive estimates which, together with a stability criterion from [33], show that the stability of U∗ (in the L–norm) depends only on the position of the eigenvalues of L, regardless the presence of the essential spectrum. Mathematics Su...