General Integral Inequalities Including Weight Functions

TL;DR

This paper introduces two broad classes of integral inequalities involving weight functions, which unify many existing inequalities and are applicable to stability analysis in infinite-dimensional systems, including PDEs and sampled-data systems.

Contribution

The paper develops general integral inequalities with weight functions that encompass many known inequalities and applies them to stability analysis of complex systems.

Findings

Unified framework for integral inequalities with weight functions

Application to Lyapunov-Krasovskii functional construction

Derived stability conditions for differential-difference systems

Abstract

In this note, we present two general classes of integral inequalities motivated by their applications to infinite dimensional systems. The inequalities possess general structures in terms of weight functions and lower quadratic bounds. Many existing inequalities in the published literature, including those with free matrix variables, are the special cases of our inequalities. An relation on the lower bounds of the proposed inequalities is also established. For specific applications, our inequalities are applied to construct a Liapunov-Krasovskii functional for the stability analysis of a linear coupled differential-difference system with a distributed delay, which gives to equivalent stability conditions based on the properties of the proposed inequalities. Finally, it is worthy to note that the inequalities in this note can be applied in general contexts such as the stability analysis of PDE-related systems or sampled-data systems.