This chapter provides an overview on recently recovered qualitative property of linear time-invariant time-delay systems admitting real spectral values. In fact, in recent studies, it has been shown that time-delay systems admitting a number of real spectral values equal to the Pólya-Szegő bound admit necessarily a real rightmost spectral value, a property called coexistent real roots-induced dominancy (CRRID). This property has been exploited in a new control paradigm called partial pole placement allowing to exactly prescribe the exponential decay of the control system solution. After introducing the theoretical foundation of such a prescribed stabilization, the problem of control of active vibration is considered, illustrating the effectiveness of the method.

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Characteristic Real Roots and CRRID Property of Time-Delay Systems: Recent Results and Prospective

  • Fazia Bedouhene,
  • Timothée Schmoderer,
  • Islam Boussaada,
  • Sami Tliba,
  • Silviu-Iulian Niculescu

摘要

This chapter provides an overview on recently recovered qualitative property of linear time-invariant time-delay systems admitting real spectral values. In fact, in recent studies, it has been shown that time-delay systems admitting a number of real spectral values equal to the Pólya-Szegő bound admit necessarily a real rightmost spectral value, a property called coexistent real roots-induced dominancy (CRRID). This property has been exploited in a new control paradigm called partial pole placement allowing to exactly prescribe the exponential decay of the control system solution. After introducing the theoretical foundation of such a prescribed stabilization, the problem of control of active vibration is considered, illustrating the effectiveness of the method.