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In this communication the use of AR modelling in the estimation of cubic phase coupling is studied. After obtaining the trispectrum of an harmonic signal with cubic phase couplings, the parametric modelling is used to design a method that models this trispectrum and allows the locatation of the cubic couplings. This method is based on a twofold AR modelling of the data using their fourth-order cumulants,...
Vibrations in dynamical structures, as those encountered for instance in mechanical, aerospace or civil engineering, are often caused by internal or external excitations. One way to attenuate vibrations that can be undesirable for safety or other reasons is by the use of active control systems. This means to use feedback controllers driving actuators at appropriate locations between the structure...
In this note we present a method for globally asymptotically stabilizing a MIMO nonlinear system by output feedback. The result relies on the use of filtered transformations and backstepping, and can be viewed as a direct extension of an existing method. The method is demonstrated via simulation on an example.
When several high voltage direct current (HVDC) systems simultaneously recover after severe faults, absorbing large amounts of reactive power from the receiving AC systems, presents new challenges for the transient voltage stability of multi-infeed HVDC (MIDC) systems. Actually DC power recovery characteristics could be controllable to some extent by selecting voltage dependant current order limiter...
In this paper we extend the agglomerative hierarchical kernel spectral clustering (AH-KSC [1]) technique from networks to datasets and images. The kernel spectral clustering (KSC) technique builds a clustering model in a primal-dual optimization framework. The dual solution leads to an eigen-decomposition. The clustering model consists of kernel evaluations, projections onto the eigenvectors and a...
This paper describes a generalized method to develop steady state model (SSM) of different electric motors comprising electric equivalent circuit (EEC) and the torque equation. In most of the books on electric motors, EEC is used to explain operation and performance characteristics of motors, but the development of these EECs is not explained convincingly. This work overcomes this shortcoming by specifically...
Exploiting of the nanostructure arrays as a promising candidate for excitation of neural cells has been analyzed. Based on the importance of the coupling effect between electrode and neuron, a multiphyscis modeling approach has been proposed. The model incorporates theoretically both structural effects (size, geometry) and electrophysiological effects. The system of equations for proposed model has...
In this work we investigate the effect of diffusive voltage and current couplings between natural pacemaker oscillators in the heterogeneous coupled oscillator model of ECG signals. We study the synchronization behavior of the oscillator system for normal and fast cardiac sinus rhythms and reproduce different mode-locked cases which correspond to known incomplete atrioventricular blocks. The obtained...
Linking multiple data collections to create longitudinal data is an important research problem with multiple applications. Longitudinal data allows analysts to perform studies that would be unfeasible otherwise. In our research we are interested in linking historical census collections to create longitudinal data that would allow tracking people overtime. The goal of the linking is to identify the...
A new method for spatial coupling of low-density parity-check ensembles is proposed. The method is inspired from overlapped layered coding. Edges of local ensembles and those defining the spatial coupling are separately built. The new method allows the construction of non-uniform coupling chains with near-Shannon spatially-varying thresholds under iterative decoding. A direct application of non-uniform...
In order to solve the design problem of coupled inductor in multiphase interleaving bidirectional DC/DC convertor, the universal design criterion of coupled inductor with general applicability was proposed. The Buck+Boost interleaving and magnetically integrated bidirectional DC/DC converter was studied under Buck mode with all inductors coupled symmetrically. The universal design criterion of coupled...
In this study, we investigate synchronization phenomena in coupled polygonal oscillatory networks with strong frustrations. We focus on the amplitude of each oscillator when the coupling strength is increased. By using the computer simulations, we confirm that the amplitude of the oscillators decreases by increasing the coupling strength and oscillation death frustrated oscillators is occurred. Furthermore,...
An exact solution is developed for the radial vibration characteristics of functionally graded piezoelectric cylindrical transducers. The material properties, such as mass density, elastic, piezoelectric and dielectric constants, are assumed to be the power-law functions of radial position. The material nonhomogeneity index of mass density can be different from that of elastic, piezoelectric and dielectric...
This paper investigated the effects of temperature on resonance properties of Film Bulk Acoustic Resonator (FBAR) in thickness-stretch mode. Based on the fundamental piezoelastic equations of piezoelectric material, the vibration equation of ideal FBAR under sine excitation voltage is derived. The solution is then obtained by using of the boundary conditions. The series and parallel resonance frequency...
Circumferential horizontal shear (SH) surface acoustic wave propagation is evaluated in the piezoelectric cylindrical layered structures for covered layer and substrate in opposite polarization. The special functions method is used to solve the coupled governing equations. Through a numerical example, we discuss the dispersion relation and electromechanical coupling factor of SH waves in the layered...
In this paper, the theme of Exponential Synchronization (ES) for a new class of Complex Dynamical Networks (CDN) with hybrid Time-Varying Delay (TVD) and Non-Time-Varying Delay (NTVD) nodes is investigated by using coupling Periodically Intermittent Pinning Control (PIPC). Based on the Lyapunov Stability Theory (LST), Kronecker product rules and PIPC method, sufficient conditions for ES and PIPC criteria...
Inductive Power Transfer (IPT) techniques are gaining more and more interest in wireless power systems. The knowledge of the coupling factor of transmitter (TX) and receiver (RX) coil is a crucial, but mostly during operation not available parameter for such systems. In this manuscript a novel method to determine the coupling factor by measuring the self-resonating frequency of the postringing signal...
In this paper, a method for MIMO system identification with unknown, but bounded measurement errors is presented, extending a recently published method for systems with only one output. It is based on an interval description of the sampled measurement data of linear, time invariant systems, where the intervals cover the unknown, but bounded errors, and yields a discrete-time model description with...
In this paper, the distributions of electric field and electric displacement in a three-layer beam-like piezoelectric harvester are revisited from the accurate piezoelectricity theory. The electric displacement D3 is obtained from the Gauss theorem in electrostatics and found to be uniformly distributed along the thickness direction. The electric field is observed linearly dependent on x3. The efficiency...
This paper presents a study on parallel coupling operation of multiple pumps. It is known that it is always better to couple pumps with identical characteristics, although practical situations are never ideal, therefore we have taken into consideration the situation where we have available just pumps with different characteristics. A mathematical model has been realized and a Matlab simulation scheme...
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