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The model and the stability of the networked control system with time delay and data packet dropout are studied in this paper. Based on the fixed rate of the data packet dropout, the networked control system is modeled as an asynchronous dynamical system(ADS) with rate constraints on events. The sufficient condition to the exponential stability of the networked control system is derived from the conclusion...
Based on the advantages of sliding mode variable structure control and fuzzy control, it designed a new composite controller -the fuzzy sliding mode variable structure controller, and applied it to the local fan. The simulation results show that not only the control strategy gives the system robustness, but also the system has good quickness and successfully achieved the goal of the speed control...
This paper proposes a stable tracking control law for mobile platform and welding torch of Autonomous Welding Mobile Robot used in shipbuilding and large spherical tank welding. Stability of the law is proved through the use of a Liapunov function. Not only the moving and rotating velocity of the robot is controlled, but also the moving velocity of the cross slider is controlled. In the simulation,...
Wireframe doesn't have the face information, so the occluded line of its projection drawing can't be eliminated by existing methods for solid. In this paper, an efficient algorithm for eliminating occluded line from projection drawing of wireframe is presented. In projection drawing, whether there is an intersection of two lines is identified by bounding box and directed triangle. Further, the visibility...
Static Synchronous Compensator can be taken as a nonlinear system, which exists in the nonlinear problem during its operation, such as chaos. So, these instability phenomena cannot be predicted in system. This research will enhance to analyze some existing phenomena; on the other hand, the new design methods and control strategies may be possible to be developed by these researches to achieve some...
This paper dedicated to investigate the integration of semi-active suspension and vehicle dynamics control system. Semi-active suspension (typically composed of a controlled damper and a passive spring) could improve the ride performance of vehicle by controlling the damper and spring. A vehicle dynamics control (VDC) system can enhance vehicle stability and handling in emergency situations through...
Passivity is an important property of systems to ensure systems's stability and stabilization. This paper investigates passivity, stability and stabilization of switched Hamiltonian systems. A concept of passivity is first presented for switched Hamiltonian systems using hamiltonian functions. Then, by the inherent structure and the Hamiltonian functions of subsystems, some criterions are proposed...
Building heterogeneous multi-core processor is desirable because it may provide high parallel performance such as instruction level parallelism (ILP) and thread-level parallelism (TLP). However, most existing operating system and parallel applications can't make good use of this heterogeneity because it arises dramatic instability sometimes, especially when the work of different core is unbalanced...
In this paper, an Active Front Steering controller is designed to improve vehicle yaw stability based on fuzzy logic. The yaw rate error and its rate of change are applied to the controller as inputs, where the steering angle correction of the front wheels is the output. The performance of the proposed control system has been verified using a nonlinear eight degrees of freedom nonlinear vehicle model,...
This paper introduced a PLC-based control system in a NC wheelset assembly machine, which included the system configuration, control mode, closed-loop control technology in cylinders and communication protocol between IPC and PLC by MPI network. The PLC-based control system is feasible, and it can strengthen the system stability and improve the efficiency of products. The control system has been successfully...
In this paper, the dynamics of a Mackey-Glass equation with delay are investigated. We prove that a sequence of Hopf bifurcations occur at the positive equilibrium as the delay increases. Explicit algorithm for determining the direction of the Hopf bifurcations and the stability of the bifurcating periodic solutions are derived, using the theory of normal form and center manifold. The global existence...
In this paper, based on the basic theorem on zeros of general transcendental functions, we investigate the stability and the existence of Hopf bifurcation at zero for a lossless transmission line network which is described by a two- delayed differential-difference equation of neutral type. At last, some numerical simulations to support the analytical conclusions are carried on.
In this paper, we considered a SIR infectious disease model with two stages, immature and mature, with the time to maturity represented by a constant time delay. We obtain positivity and boundedness of solutions and analyze the equilibria and their stability properties.
In this paper, the predator-prey system with two delays is investigated. The stability of the positive equi-librium is discussed by analyzing the associated char-acteristic transcendental equations. The conditions to guarantee the global existence of periodic solutions are given. At last, some numerical simulations to support the analytical conclusions are carried out.
The stability of MPC is a tighten problem and can be guaranteed through choosing a set of ingredients which satisfying stability conditions. The ingredients are the terminal cost function, the local control law and the terminal constraint set. In this paper, a novel way of choosing these ingredients is shown. The solution of the optimal problem which is changed by adding the slaw-rate items into the...
In this paper, an Euler-Bernoulli equation with one end fixed and a tip mass at another end is considered. By using Guo's conclusion that the Riesz basis property holds for the general system if its associated characteristic equation is strongly regular, it is shown that the Riesz basis property can be established for the closed-loop system under boundary linear feedback control. In the meanwhile,...
This paper is concerned with the controller design of networked control systems (NCSs) with time delay in the state derivatives. We employ a model of the NCSs with time delay in the state derivatives, taking into consideration both the network-induced delay and the time delay in the state derivatives. On the basis of the given model, a controller design method is proposed by using the delay-dependent...
A new predictive power control scheme was considered for a wireless cellular system employing orthogonal frequency division multiplexing (OFDM). To mitigate the effect of cochannel interference CCI while satisfying required quality of service, the power level on each subchannel of OFDM systems should be allocated to and controlled at an optimum level. A conventional approach to OFDM power allocation...
Design optimization of the transmission towers is important since the cost of tower structure accounts for a high proportion of the total cost of a transmission line. This work treats base widths of tower as design variables to obtain the minimum tower weight under the strength and stability constraints for the tower structure members. The forces in each structure member are calculated in ANSYS using...
Based on multi-body system dynamics and fuzzy control theory, this paper researches the Vehicle Dynamic Control (VDC) system, and a multi-body dynamics vehicle model was built up by dint of ADAMS/Car software. A fuzzy controller has been designed for the VDC system under Matlab environment, and the controller can generate a suitable yaw moment which is obtained from the difference of the brake forces...
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