Stability-Constraint-Free Solutions to Solve Time-Varying Linear Equation System

• Published in: IEEE access 2022, Vol.10, p.34228-34235
• Main Authors: Li, Jian, Fan, Jianwei, Zhu, Xinhui, Sun, Yange, Li, Yanling
• Format: Article
• Language: English
• Subjects: Finite difference method; Finite wordlength effects; Lagrange finite difference; Lagrangian functions; Linear equations; Mathematical models; Numerical stability; Real-time systems; Stability; stability-constraint-free solutions; theoretical solution decomposition; Time-varying linear equation system; Time-varying systems
• ISSN: 2169-3536; 2169-3536
• DOI: 10.1109/ACCESS.2022.3162860

Time-varying linear equation systems have been solved by the traditional zeroing neural dynamics approach in recent years. However, this method has to satisfy the stability constraint, which is a very rigorous condition. For this reason, traditional Lagrange-type finite difference formulas fail to lead to effective solutions, and we have to utilize more instants and reduce accuracy so that this condition is satisfied. In this work, we develop a new method of solving a time-varying linear equation system, which is based on theoretical solution decomposition. As a result, the proposed solutions are stability-constraint-free. We do not have to meticulously search effective time-discretization formulas because traditional Lagrange-type formulas are sufficient and especially effective. In addition, the proposed solutions have other advantages. For example, they do not need convergence procedures; they do not have storage requirements for past calculative results; and they are still effective when the sampling gap value is relatively large. Detailed comparisons are presented in this paper. Comparative numerical experiments are also shown to substantiate the effectiveness and advantages of the proposed solutions.