To solve abruptly occurrence of parameters jumping and directed communication topologies changing in the control process networked manipulators, this paper, distributed switched consensus algorithms are formulated for a group robot manipulators realizing cooperative performance. In fact, Lagrange systems modeled as regarding different topologies. Namely, dynamic models switch when system or topology structures change. The strategy is constructed by resorting to (improved) average dwell time...

Wind-tunnel tests were conducted to better understand the flow pattern of a hypersonic inlet at an unstable-unstarted condition that is caused by downstream mass choking. High-speed shadowgraph visualization and instantaneous pressure measurements are employed reveal oscillations shock system unsteady process duct flow. Results show both inside in front oscillates intermittently when unstarted. With increase throttling ratio, fundamental frequency goes up shock-on-lip time down, but whereby...

ABSTRACT This paper presents a novel robust consensus control method for multiple nonholonomic wheeled mobile robots (MNWMRs). The involves developing dynamic sliding mode tracker based on the Average Dwell Time (ADT) technique, which tracks velocity state onto kinematic auxiliary vector through torque control. While communication topologies are randomly switched to achieve of virtual trajectories by controlled robots. Furthermore, considering influence strong external disturbances and...

Abstract This paper investigates the adaptive finite‐time robust control problem of a class nonlinear time‐delay Hamiltonian systems via Lyapunov‐Krasovskii (L‐K) method, and proposes some delay‐dependent results on issue. Different from existing works, this first presents time‐varying stability (FTS) criterion an L‐K functional approach, obtains two FTS conditions by constructing specific functionals. Then, is investigated for port‐controlled (PCH) systems, design procedure presented....

This paper investigates the stabilization problem of fractional order systems with both model uncertainty and external disturbance. By combining linear feedback control method, dynamic disturbance estimator (UDE)-based respectively, two new UDE-based methods are developed. Using these methods, can be stabilized by three steps. In first step, controllers designed to stabilize nominal systems. The second step is design a controller estimate third combined into realize those Finally, numerical...

In this paper, parameters of a given (chaotic) dynamical system are estimated from time series by using identical synchronization between two different systems. This technique is based on the invariance principle differential equations, i.e., Lyapunov function involving error and estimation parameters. The control used in consists feedback adaptive loop associated with update law Our process indicates that one may identify dynamically all unknown as long available. Lorenz Rössler systems to...

Summary The paper presents the results of measurement static pressure, total pressure and swirl in flow through an S-shaped duct typical air intake proportions mounted a wind tunnel tested at different incidences through-flow ratios. In order to reduce magnitude high incidence, two methods have been studied - one, change distribution pressures by means spoiler two, re-energize separated with inflow free stream auxiliary inlets. Measurements were also made, 0° perforated intended simulate...

Abstract This paper investigates the stability of a class switched linear systems, and proposes number new results on analysis. A novel analysis method is developed by using 2‐norm technique, then several are obtained based method. It shown that main in this not only guarantee systems under arbitrary switching, but also provide an algorithm to find minimum dwell time (MDT) with which switches make stable. Finally, illustrative examples numerical simulations studied paper. The study shows our...

Summary This paper proposes a sliding‐mode control (SMC) method to achieve practical cooperative consensus tracking for network of multiple nonholonomic wheeled mobile robots (MNWMRs) with input disturbances. A novel SMC surface under the constraints is first formulated characterize communication interactions among networked framework polar coordinates. unified distributed strategy then proposed by systematically combining position controller and direction controller. Furthermore, simple yet...

The impulse and self starting characteristics of a mixed-compression hypersonic inlet designed at Mach number 6.5 are studied by applying the unsteady computational fluid dynamics (CFD) method. full Navier–Stokes equations solved with assumption viscous perfect gas model, shear-stress transport (SST) k–ω two-equation Reynolds averaged (RANS) model is used for turbulence modeling. Results indicate that during starting, flow field divided into three zones different aerodynamic parameters...

Summary As part of a series investigations the swirl in S-ducts, present paper gives results tests on duct with both horizontal and vertical offsets, for comparison earlier work ducts offset only. Results obtained bear similarity to those Reference 2, which had same cross-sectional shapes areas, but addition magnifies resultant considerably. before, is found be sensitive entry conditions, that solid spoiler, blocking off 15% width from inside wall, reverses sense final swirl. Taken overall,...

In this paper, a simple adaptive control is proposed for the synchronization of chaotic dynamics resistive–capacitive–inductive-shunted Josephson junctions (RCLSJ). The problem investigated based on drive–response system configuration consisting two identical RCLSJ with and without parameters. addition, when parameters are unknown considered parameter estimation. Sufficient conditions global asymptotic given numerical simulations employed to demonstrate efficiency scheme. presence noise, we...

Hypersonic inlet self-starting ability is of great importance for scramjet engines and hypersonic flight vehicles to operate stably efficiently. However, the prediction limit generally difficult. This paper proposes a flow-based approach limiting internal contraction ratio two-dimensional inlets. The key lies in establishment general approximate expression fluid dynamic blockage, caused by migration primary separation bubble down portion inlet. Formulas blockage are given. predicted results...

This paper is concerned with the partial anti-synchronization of 4D financial hyper-chaotic system periodically external disturbance. Firstly, existence problem for nominal proven. Then, a suitable filter presented, by which disturbance asymptotically estimated. Moreover, two estimator (DE)-based controllers are designed to realize such system. Finally, numerical simulation verifies effectiveness and correctness proposed results.

For gas–liquid two-phase flow in comb-shaped microchannels, operating conditions could change the pattern and uniformity of distribution further affect mass transfer performance. In this study, hydrodynamics microchannels are investigated. Four patterns observed: single-phase or foam flow, slug-bubbly slug compact flow. When is velocity microchannel ideal, its performance close to that a single microchannel. Before appearance improved with increase ratio rate. After deteriorated