A new kind of nonlinear disturbance observer for nonlinear systems with applications to cruise control of air-breathing hypersonic vehicles. Issue 9 (2nd September 2017)

• Record Type: Journal Article
• Authors: Yang, Zhiling; Meng, Bin; Sun, Hongfei
• Is Part Of: International journal of control. Volume 90:Issue 9(2017)
• Page Start: 1935
• Page End: 1950
• Publication Date: 2017-09-02
• Subjects: High-order nonlinear disturbance observer -- nonlinear system -- robustness -- air-breathing hypersonic vehicle; Automatic control -- Periodicals; Electronic journals; 629.8
• DOI: 10.1080/00207179.2016.1229039
• Languages: English
• ISSNs: 0020-7179

Abstract

ABSTRACT: The nonlinear disturbance observer (NDO) proposed by W. H. Chen et al. needs an assumption that the disturbance varies slowly relative to the observer dynamics (i.e.d ˙ ( t ) ≈ 0 ), so as to ensure the convergence of the disturbance observer. Whend ˙ ( t ) ≠ 0, however, there is no guarantee of the convergence in theory. To solve the problem, this paper presents a new NDO, namely high-order nonlinear disturbance observer (HONDO), for a nonlinear system with an unknown fast time-varying disturbance (i.e.d ˙ ( t ) ≠ 0 ). The HONDO not only inherits all the advantages of the usual NDO, but also guarantees the convergence of the estimated error for a nonlinear system with a fast time-varying disturbance. Therefore, the HONDO proposed in this paper broadens the application scope of the conventional NDOs, thus is a supplement to the theory of NDO. The numerical simulation for the cruise control of an air-breathing hypersonic vehicle further verifies the effectiveness of the HONDO-based control.