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The impact of DC current on excitation characteristic of transformer is analyzed under bipolar asymmetric operation of HVDC power transmission system. The operating performance of single-phase transformer with three-limb core located near DC grounding pole is measured, and the relationship of vibration, noise and oil temperature of the transformer with such parameters as unbalance degree of HVDC bipolar...
In this paper, rotor slits on the rotor's outer circumference is adopted to reduce certain harmonic components of radial forces and, hence, acoustic noise and vibration in an interior permanent magnet synchronous machine (IPMSM). The 48th order of harmonic component for the radial force is found to be responsible for the noise and vibration problem in the studied motor. For this purpose, the influential...
The main purpose of this paper is to perform a vibro-acoustic analysis in order to predict acoustic response by Computer-Aided Engineering (CAE) models related to a single phase permanent split capacitor motor noise. The radial magnetic force between stator and rotor is a main excitation source to create deformations of the stator housing, causing vibrations and acoustic noise. These forces are determined...
Oscillations in power electronic circuits with fast switching semiconductors are commonly known and the corresponding parasitic elements have been investigated in multiple literature. However, this paper investigates the triggering of these electromagnetic interference (EMI)-critical oscillations. An analytical description is derived using a boost converter circuit. Based on this description an optimization...
Due to physical laws or mathematical properties the parameters and/or the states of some dynamic systems satisfy certain constraints, and exploitation of such constraints generally is expected to produce more accurate system models. This paper is concerned with modeling of the dynamic systems with equality constraints. An effective framework of the constrained dynamics modeling is proposed by which...
Noise-aware Design, statistical modeling analysis and experimental verification of crystal oscillators fabricated using advanced SiGe-C BiCMOS technology are presented. The concept of Broadband stochastic equivalent circuit models extraction is introduced to properly account for variability and sensitivity of critical design parameters (e.g., Process, Power Supply, Temperature, Geometry). Engineering...
For image segmentation, methods based on Markov random field (MRF) have been widely used due to the capability of incorporating contextual information into account. Among these methods, the recently proposed Triplet Markov fields (TMF) model enhances the image nonstationary modeling by introducing an auxiliary field. According to the introduced auxiliary field, TMF can partition the nonstationary...
To model the electromagnetic emissions of integrated circuits, a full chip simulation is the most accurate method. Full chip simulations are very complex, time consuming, and do not protect the intellectual property. Therefore, other models were developed that are fast, protect confidential information and have a lower complexity. In this paper, we give a state-of-the-art overview of these models.
When a continuous time sigma delta modulator (CT ΣΔM) is overloaded, its output signal to quantization noise ratio (SQNR) decreases when the ΣΔM's input power is increased over a certain value. In this paper, the range of quantizer gains that cause a CT ΣΔM to overload is determined, and this range of values is used to determine the maximum input signal power that prevents overload. To validate the...
In the literature a lot of articles about so-called feedback-based trading strategies, i.e., strategies that compute investment exclusively from their own gain exist. Price is therein treated as a disturbance variable in the technical application. With these strategies, astonishing results may be shown. However, the so-called price taker property is always assumed, that means that one's own trading...
A flatness based robust active disturbance rejection control technique scheme is proposed for the problem of stabilization and tracking control of a special underactuated, non-feedback linearizable mechanical system known as the cart inverted pendulum. The differential parametrization on the basis of linearizing the system around an arbitrary equilibrium decouples the underactuated systems into two...
Compared to conventional AC grids, DC microgrids demand different switchgear and safety concepts. Electric arcs across mechanical contacts of circuit breakers during switching operations and also arc faults within the installation are more stable in the case of continuous current. Model based methods are important tools not only for selecting the appropriate method of converter control, but also for...
The most common approach in Structural Health Monitoring (SHM) consists in performing accelerometric measures of the response of the monitored structures to natural or artificial stimuli (e.g. wind, urban traffic, seismic events etc.) and in modeling the dynamic behavior of the structure on the basis of these measures. The models can be used, in particular, to extract and compare the main modes i...
In this paper an accurate EMI model of a 5W flyback converter based on discrete devices modeling is presented. To improve the accuracy of EMI model, passive devices, active devices, power IC and the parameters of PCB are all taken into consideration. The simulation results show that, errors of main system-level parameters can be controlled in 5% and errors at the EMI peak values can be controlled...
The paper describes methodology for modelling and simulative estimation of sensitivity and range of ISM band Remote Keyless Entry transmitter-receiver system for automotive applications. The method is based on electrical simulation including PCB extraction data and parameters statistical distribution to evaluate best- and worst case scenarios. Both transmitter and receiver circuits are considered,...
This paper presents some of the issues of signal and power integrity in relation with appropriate modeling and simulation methods that are available. The clock signal of a communication protocol is experimentally tested in order to find the rules to improve its signal integrity (SI) along the paths on the printed circuit board (PCB). The signal and power integrity of this PCB are improved using a...
We have reported analytical expressions for transition width and transition jitter based on the media micro-structure and the readback resolution [1]. In most practical applications, the switching field distribution (SFD) cannot be ignored. In this work we derive analytical formulations that are good approximations for the transition width and transition jitter using Voronoi cell modeling with a finite...
As the main source of ship propulsion motor, reduce the vibration noise is of great significance for improving the acoustic stealth performance of ships. Establish motor feet vibration transfer path analysis model to determine the primary excitation source and transfer path; Hammering method is used to test the transfer function of the path, and collect the response of reference point and target point...
The distorted exponential signal can be decomposed on exponential components with different amplitudes and time constants. Under the hypothesis to model this signal by multi exponential function, different algorithms were pointed out to extract the distortion parameters. In the paper is proposed an algorithm that takes into analysis real exponential signal affected by quantization noise, offset and...
The characterization of a hysteretic system response to noise is a challenging problem due to the complexity of the non-Markovian process found as the system output. The recent development of the mathematical theory to describe stochastic processes defined on graphs has provided the framework to analytically calculate the noise spectral density for Preisach hysteretic models [1]. Numerical simulations...
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