This paper presents a systematical reduced-order observer design method for class of switched descriptor systems containing unknown inputs (UIs) in both the dynamic and output equations. Generally speaking, when system contains UIs, will become much more challenging. In order to overcome difficulty brought by UIs output, first, introducing new UI vector, equivalent is obtained, which does not contain corresponding any more. Then, purpose design, matching condition (OMC) minimal phase (MPC)...

This paper examines the problem of observer-based sliding mode control designs for a class descriptor Takagi-Sugeno fuzzy systems with time delay and uncertainties. Specifically, based on detailed discussions existence conditions, reduced-order robust observer is designed first where influences uncertainties are totally removed. Second, by choosing appropriate coordinate transformations matrix decompositions, an actual virtual variables constructed, controller developed to handle such that...

In this article, a leader-follower asymptotic consensus control strategy is developed for class of linear multiagent systems (MASs) with unknown external disturbances and measurement noises. First, the preconditions, minimum phase condition (MPC) observer matching (OMC), are discussed in detail, an equivalent result under these two preconditions given. way, corresponding results from Corless Tu (1998) improved. Meanwhile, reduced-order designed constructed augmented system to estimate states...

Abstract Classical throughflow methodologies, due to their oversimplified assumptions regarding dimensionality reduction, result in a significant reliance on empirical inputs. This paper introduces rigorous reduction approach, building upon Adamczyk's average-passage wherein four averaging operators are incorporated into the Navier-Stokes (NS) equations. method dispels conventional of time and passage periodicity inherent primary equations, simultaneously addressing circumferential...

This study is concerned with the finite-time observer (FTO) design for a class of singular systems subject to unknown inputs in both state and output equations. First, order overcome restriction classical FTO method, two different non-singular auxiliary dynamic systems, which are simultaneously equivalent original system, constructed act as new reference sub-observers' design. Second, based on matching condition strong observability condition, it proven that an can be designed where...

This paper considers the problems of unknown input observer (UIO) designs when so-called matching condition (OMC) is not satisfied. Firstly, system left-invertibility (SLI) concept investigated in detail and some new criteria are given. Secondly, based on SLI concept, an augmented output vector formed partly by original measurable auxiliary obtained. By this constructed vector, allowed to be transformed into equivalent linear dynamic which contains no input, thus a simple Luenberger can...

This study considers the problems of simultaneous estimations states, actuator and sensor faults design observer‐based fault‐tolerant control (FTC) for a class uncertain switched systems. First, by treating system state, fault as an augmented state vector, descriptor is constructed, where output equation contains no in form. Second, relationships between preconditions original are investigated detail, under which reduced‐order observer, can estimate simultaneously without suffering from...

Steer-by-wire (SBW) systems with steering actuator motors rotating the front wheels allow more flexibility for handling stability control; however, determining desired angle and accurately tracking are still key challenges. Therefore, a modified control strategy is proposed in this paper. Firstly, based on normal function, unified variable ratio (UniVSR) model that varies vehicle speed wheel developed. Then, UniVSR parameters optimized by particle swarm optimization (PSO) algorithm segments...

This paper is concerned with prescribed-time functional unknown input observer (PTFUIO) design for linear descriptor systems. First, by constructing two identical asymptotic convergence observers, a new PTFUIO developed which can achieve an exact estimation within arbitrarily prescribed time, where both the accuracy and time pre-definition are independent of initial conditions original system. Also, necessary sufficient existence such given in terms system matrices easy to examine. Finally,...

The flywheel energy storage (FES) system presented in this paper is composed of four parts: the flywheel, bearing, motor/generator and power converter. control methods strategy FES network are introduced detail. During period generating times, waveform converter output currents controlled to be sinusoidal by using pulse width modulation (SPWM) method, so efficiency conversion high torque ripple minimized. starting operating large moment inertia simulated studied for latest experimental...

A Super Capacitor Energy Storage (SCES) system applied to distributed generation and distribution network is presented, which mainly composed of three parts: the electrical double-layer capacitors array that stores energy, AC/DC-DC/AC power converter integrated control microprocessors. Application studies SCES for active supply, voltage control, oscillation elimination harmonic are described. The stability effect relation node impedance analyzed in detail. This paper also presents on...