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Amplitude death (AD) is a coupling induced stabilization of the fixed point (FP) of a dynamical system. This paper applies AD concept, induced by dynamic coupling in order to solve the stabilizing issues in presence of constant power load (CPL) for avoiding the use of separate delay circuitry. This AD method has been demonstrated by numerical simulations as well as the bifurcation analysis.
A 5-axis hybrid computer numerical controlled machine was developed using a 2 degree of freedom spherical parallel mechanism known as the Agile Eye. The hybrid machine design consisted of a 3-axis serial gantry type structure, with the Agile Eye being placed at the end of the Z-Axis to allow for machining on inclined planes. A control system was designed that controlled two kinematic systems, the...
Greenhouse system is a MIMO(multi-input, multioutput), non-linear, strong coupling system. Nowadays, most of the greenhouse control methods using PID control cannot relieve the coupling between variables, so the effects of these controls are not ideal. Aiming at these problems, a feedback linearization decoupling method is designed for the coupling between CO2 concentration, temperature and humidity,...
The hybrid analysis of mode matching/FEM (MM/FEM) is applied to a waveguide short-slot 2-plane coupler. The analysis model is reduced to the one-eighth model by considering the three-dimensional structural symmetry. The analysis results agree well with those by HFSS.
The dynamic characteristic, stability characteristic, and power sharing situation of the distributed system based on traditional droop control strategy are easily affected by uncontrollable power coupling and difference of line impedance of the distributed generator (DG) units in distributed system. In order to solve these drawbacks, an improved droop control strategy is proposed. It introduces the...
This paper proposes an approach to estimate the ratio between shorted and total turns in interior permanent magnet synchronous machines (IPMSM). When an inter-turn short circuit (ISC) occurs, a particular disturbance affects the motor. The proposed method estimates this disturbance using an observer; this estimated signal is used to obtain the short circuit ratio. The observers are based on a dynamic...
Hybrid excited flux-switching machine (HEFS) is a novel brushless synchronous motor. Compared to conventional permanent magnet synchronous machine (PMSM) and permanent magnet flux switching (PMFS) machine, it has additional excitation winding in its stator to modulate the air-gap magnet field. In this paper, the topology and operating principle of HEFS is analyzed. Its dynamic mathematical models...
The increasing penetration of grid-connected RES systems, advanced control algorithms have been developed to operate under grid faults and fulfill strict requirements of the grid codes. In order to overcome this, the current controller performance is critical considering it as the inner control loop of any grid-connected RES system. Based on the resonant control concept, this paper presents a modified...
The process where a laser and a Si waveguide were coupled was simulated by MATLAB. In order to obtain the coupling efficiency accurately and quickly, an improved finite-difference beam-propagation method(FD-BPM) and the simple transparent boundary condition(STBC) were selected. Several spot-size convertors (SSCs) of different structure with tapered Si waveguide, square SiON waveguide and SiO2 layer...
In the paper, a simple equivalent circuit model is built between transmitting coil and receiving coil via coupled magnetic resonance, and the simulation of frequency and efficiency is also supply. Node equations for the resonance coils are built by using the equivalent circuit and the optimum distance is analytically derived for optimum coupling coefficient for high transmission efficiency. The equivalent...
Aiming at the characteristics of UAV high-speed permanent magnet motor, wide speed range, large current and parameter variation, an online efficiency optimal control method is proposed based on model reference adaptive (MRAS) algorithm. The MRAS-based approach can identify the machine parameters according to different operation conditions, optimizing the stator current constantly and improving the...
In this paper, a continuous-time distributed optimization algorithm based on multi-agent system is proposed for solving the distributed least absolute deviation problems subject to hybrid constraints. In the multi-agent network, each of the L1-norm functions is realized using the projection operator. Meanwhile, each agent must be subject to the local hybrid constraints. Then all the agents constitute...
This paper presents an analysis of effect of external load on hemispherical resonator gyroscope (HRG) feedback control system with state constraint. Firstly, the analytical solution of dynamic equation under multi-electrode excitation is obtained based on dynamic equations of resonator in the second-order resonant state. Through analysis, two main reasons that external load influences feedback control...
For the widely-adopted inverter-fed drives, the stator winding insulation is more prone to various stresses compared to the line-start machines, i.e. the high rates of voltage change due to inverter switching (dv/dt), which will result in higher chances of insulation breakdown. To better illustrate the dynamic behaviors of the IPM machines under the stator turn fault, this paper presents a transient...
A control strategy to manage the circulating current content in a Modular Multilevel Converter in direct AC-AC topology is proposed in this article. The converter is connected in three-phase YDY configuration which forms a closed delta path for free current circulation while keeping outsider waveforms with low THD content. Circulating current correction becomes necessary face to any kind of unbalance...
In this paper, the critical point that is a coupling strength at which the model changes from desynchronization to synchronization is solved by the mean field method theoretically and the phenomenon that with the increase of the mean value in the Gaussian distribution, the corresponding critical point is reduced is explained. Based on simulation and the theoretical results, the threshold of the mean...
We present the differences between Input-Output formalism and Lindblad Master Equation approach in transmission spectrum of Coupled high-Q Cavity with Quantum Dot system in weak coupling regime. Full-width-half-maximum (FWHM) and the peak transmission of Dipole Induced Transparency (DIT) are analyzed in detail.
The cam-type ATC manipulator has the advantages of fast tool changing and high efficiency, but the structure is complex and difficult to design. This paper proposed a new method of globoid cam 3D modeling for ATC manipulator-double-globoid cam mechanism, which could solve the design problem of the cam-type ATC device. Then, the multi-ridge dynamics model of the cam-type ATC manipulator was established;...
Permanent magnet synchronous machines with high torque density, which is a frequent requirement for high level applications, are characterized by saturation and cross-saturation effects which need to be taken into account in simulation models used for the purpose of control system design or for optimized design of the machine geometry. In this paper three simulation models of permanent magnet machines...
This paper applies a recurrent higher-order neural network for sliding-mode pinning control of complex networks for achieving trajectory tracking. This control strategy does not require having the same coupling strength for all node connections on the network. The tracking effectiveness and dynamical behavior of the controlled network is illustrated via simulations.
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