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This paper deals with the analytical description of an interior permanent magnet synchronous motor running in six-step conduction mode. It assumes a non-sinusoidal back emf, but inductances vary sinusoidally with the rotor position. The proposed model renounces Park's transformation and delivers a set of equations which allow the numerical simulation of phase currents and torque in the abc reference...
The simple adaptive-robust control algorithm for time-invariant uncertain linear plants is proposed. Only scalar input and output of the plant are available for measurement. Algorithm provides tracking of a plant output to a reference signal with required accuracy. Simulations results illustrating an efficiency of proposed scheme are presented.
This paper presents a method to model the drain current of LDMOS working in the 3rd quadrant (Vds<0), which is important for power management IC design. The DIBL effect in 3rd quadrant is shown to be much more significant than that in 1st quadrant (Vds>0), and is not captured by the existing LDMOS models. Also, the threshold voltage model is not accurate in 3rd quadrant, where the drain-body...
The routing policy Size Interval Task Assignment (SITA) isolates small arrivals from large arrivals, while choosing intervals to balance the workload of each server. It works well for highly variable arrivals, but the isolation can cause server idle-ness. To improve this, we suggest a scheme to add pooling to these SITA-like systems, which can result in better performance. We propose a routing policy,...
The most industrial applications use the variation of the torque, speed and/or position in process, for which extremely severe specifications are needed. In the field of the drive of the electric machines, the elimination of the mechanical speed sensor can present an economic interest and improve safety of operation. One thus tries to make fulfill the speed measurement by implementing in a Digital...
This paper presents a modified s-to-z transformation of VVGS and VVG- Al-SKG rule, that is expanded for fractional powers based on the principle of continued fraction expansion (CFE). The magnitude response is observed to be improved at low frequencies as compared to the VVGS and VVG-AL-SKG operator. The paper also introduces a generalized design of a half differentiator based on the Al-Alaoui principle,...
In this paper a dynamic model is proposed for a wheeled mobile robot (WMR) that incorporates a novel slip characterization and is used to study navigation under hard control constraints. Many available dynamic models of WMR assume that either the wheels roll without slipping or has longitudinal slip only. As a result they do not necessarily capture the true dynamics of WMRs. The model proposed in...
The exploration of the mechanism of human behavior becomes very hot and interesting due to its importance and complexity. With the improvement of network technology, online social networks have developed rapidly and changed the traditional way of people's communication. Large amount of data of user behavior is recorded, which gives us an opportunity to study the mechanism of human behavior. In this...
The paper presents a detailed analysis of the asymmetrical half-bridge PWM converter. Due to its advantages with regard to efficiency, power density and cost the topology gains increasing attention. Recent publications propose a rough but simple converter model which helps to understand the basic converter functioning. A comparison between measured and simulated waveforms, however, reveals its insufficiency...
A digital calibration technique to linearize capacitor mismatch, residue amplifier gain, and nonlinearity in a two-step ADC based on the split-ADC technique [1] is presented. Although multiple publications have been reported before on the split-calibration of pipelined ADC's, none of them is comprehensive, meaning capacitor mismatch, residue gain, and linearity are never treated in one work at the...
With the increasing density of transistors in advanced technology nodes, the radiation is an ongoing problem affecting the contents of memory cells. This paper presents the simulation results of radiation immunity for two different memory cell technologies: 32nm Bulk CMOS and 28nm FDSOI. The effect of Single-Event Upset (SEU) caused by the heavy ion impact with different Linear Energy Transfer characteristic...
A photovoltaic (PV) array show multi local maximum power points mode under partially shaded conditions, where the operating point of the PV system tends to converge to a local maximum power point (LMPP) which is not the real maximum power point. A novel MPPT method is proposed in this paper to achieve global maximum power point tracking (GMPPT) under partially shaded conditions. The behavior of I–V...
We present a model for the operation of a single-island adiabatic electron pump with field-effect transistors acting as tunable barriers. We account for the electrostatics by modeling the capacitive network and fit the parameters of the gate-dependent barrier conductances which include exponential dependence in the subthreshold regime. This procedure results in the knowledge of the parametric dependence...
In the traditional terminal guidance, the state estimator and guidance law are design independently by assuming the validity of the separation principle and the certainty equivalence principle, which are only valid for linear systems with Gaussian noise. This paper considers the nonlinear terminal guidance system for a target interception problem by multiple vehicles. Firstly, the probability density...
We continue to consider the question of what language features are needed to effectively model cyber-physical systems (CPS). In previous work, we proposed using a core language as a way to study this question, and showed how several basic aspects of CPS can be modeled clearly in a language with a small set of constructs. This paper reports on the result of our analysis of two, more complex, case studies...
This paper develops a kinematic path-tracking algorithm for a nonholonomic mobile robot using an improved iterative learning control (I-ILC) technique. The proposed algorithm produces a velocity command to the wheeled robot, in addition, the state disturbances and measurement noises are taken into consideration. In the learning rule, an adjustable parameter is defined and by adjusting this parameter...
For the missile-target relative motion equations in the two-dimensional plane, a sliding mode guidance law design problem with terminal line-of-sight angle constraints in maneuvering target intercept is investigated in this paper. The attack angle constraints are transformed into line-of-sight angle constraints. A finite-time convergent linear sliding mode surface including the desired line-of-sight...
In this study, the propagation path of radio wave in the sporadic E layer of the ionosphere is computed by the basic equations of ray-tracing and Runge-Kutta algorithm, which is not considering the terrestrial magnetic field or the collision conditions. From the computation results of the radio wave propagation in sporadic E layer by the method of ray-tracing, it can be seen that a reference for the...
Inverter connected renewable energy sources are becoming increasingly general in micro-grids. It has brought many problems and challenges to the stability and transient of the system. Traditional constant voltage and constant frequency (CVCF) method fits for many occasions, but it can't plug and play easily because it needs communication between the micro-grid controller and energy sources. Peer to...
In order to improve spectrum utilization efficiency of Cognitive Radio (CR) systems, it is important for Secondary User (SU) to get knowledge about Primary User(PU)'s behavior when SU exploits opportunity to access spectrum. Radio Environment Database has recently been proposed to provide information about PU. Traditional advanced spectrum database constructed based on spectrum sensing method assumes...
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