Riesz Basis Generation: Comparison Method

  • Bao-Zhu GuoEmail author
  • Jun-Min Wang
Part of the Communications and Control Engineering book series (CCE)


This chapter provides a panoramic view on the comparison method. It discusses systematically how the comparison method is used to derive the Riesz basis generation for systems described by partial differential equations. A basic assumption for comparison method to be working is that the feedback can be considered as a perturbation of the system itself, that is, the order of the feedback is lower than the order of original system, which is clear from the spectrum or transfer function point of view. It starts with a constant beam equation with collocated boundary feedback control, and then the beam equation with variable coefficients. A beam equation with span pointwise control is presented to show its Riesz basis and exponential stability. A one-dimensional thermoelastic system is fully discussed. The Riesz basis property has been developed for these systems, which implies particularly that the dynamics of the system is completely determined by vibration frequencies. Mathematically, all the operators are of compact resolvent. In the last section, however, an example of the Boltzmann integral model is presented where the resolvent is not compact and the continuous spectrum exists. Two different types of Boltzmann integrals for the dynamics of vibrating systems are discussed and the Riesz basis property has been developed.


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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Academy of Mathematics and Systems ScienceAcademia SinicaBeijingChina
  2. 2.School of Computer Science and Applied MathematicsUniversity of the WitwatersrandJohannesburgSouth Africa
  3. 3.School of Mathematics and StatisticsBeijing Institute of TechnologyBeijingChina

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