scholarly journals A Parametric Conducted Emission Modeling Method of a Switching Model Power Supply (SMPS) Chip by a Developed Vector Fitting Algorithm

Electronics ◽  
2019 ◽  
Vol 8 (7) ◽  
pp. 725 ◽  
Author(s):  
Xuchun Hao ◽  
Shuguo Xie ◽  
Ziyao Chen
Keyword(s):  
Power Supply ◽  
Simulation Software ◽  
Modeling Method ◽  
Forecast Errors ◽  
Emission Model ◽  
Electromagnetic Modeling ◽  
Switching Model ◽  
Vector Fitting ◽  
Fitting Algorithm ◽  
Conducted Emission

This paper proposes a modeling method to establish a parametric-conducted emission model of a switching model power supply (SMPS) chip through a developed vector fitting algorithm. A common SMPS chip LTM8025 was taken as an example to explain the modeling process. According to the integrated circuit (IC) electromagnetic modeling (ICEM) standard, the parametric conducted emission model is divided into two parts: IC internal activity (ICIA) and IC passive distribution network (ICPDN). The parameters of ICIA are identified by measured data and correlated with key components; an improved vector-fitting algorithm is proposed to solve the fitting problem of ICPDN without phase information. This parametric model can be used with commercial simulation software together to achieve predictions of conducted emissions from power modules. The experiment results show that the maximum and 90% confidence interval of the forecast errors are 9.677 dB and (−4.56 dB, 6.52 dB) respectively, which achieve the international standard requirements and have sufficient accuracy and effectiveness.

scholarly journals Safety in residential buildings: Evacuation from residential buildings without fire escape stairs

2021 ◽  
Vol 69 (1) ◽  
pp. 148-178
Author(s):  
Radoje Jevtić
Keyword(s):  
Simulation Model ◽  
Residential Buildings ◽  
Residential Building ◽  
Simulation Software ◽  
Modeling Method ◽  
Real Object ◽  
Object A ◽  
The Third

Introduction/purpose: Safety in high residential buildings presents a very important and always actual task. In case of some unforeseen and dangerous occurrences, their residents must be evacuated. Fire, earthquakes, and terrorism are only some of such situations. The speed of evacuation from high residential buildings depends on many different factors. A particularly difficult and complex evacuation task concerns buildings without fire escape stairs. Methods: The modeling method was used in this paper. Based on a real object - a residential building, an appropriate simulation model was realized in appropriate simulation software. Results: The results of this paper have shown that, out of four scenarios, the fastest evacuation was for the evacuation speed of 1.75 m/s. The first two scenarios did not report any jams, unlike the third and fourth scenario; in the third scenario, the occupants' speeds were 0.75 m/s and 1.25 m/s while in the fourth scenario, the simulated occupants' speeds were from 0.75 m/s to 1.75 m/s. Conclusion:The usage of appropriate simulation software enables fast, precise, safe and cheap calculation of evacuation times and it can significantly improve evacuation procedures and evacuation strategies.

scholarly journals Rapid Modeling Method for Road Traffic Noise Sources: A case study in Beijing

Noise Mapping ◽  
2015 ◽  
Vol 2 (1) ◽  
Author(s):  
L. Zhu ◽  
X. Li ◽  
C. Jiang ◽  
L. Liu ◽  
R. Wu ◽  
...  
Keyword(s):  
Road Traffic ◽  
Traffic Noise ◽  
Modeling Method ◽  
Model Parameters ◽  
Road Traffic Noise ◽  
Emission Model ◽  
Noise Sources ◽  
The Road ◽  
The Mean ◽  
Rapid Modeling

AbstractBased on the local road traffic conditions in Beijing, China, this contribution proposes a rapid modeling method for road traffic noise sources. Since establishing the standardized experiment fields are expensive, real roads are used to determine the road traffic noise emission model in the method. Due to the similarity in the urban structures in China and Japan, this paper uses the ASJ- 2013 model as a template and replaces its model parameters with the ones output by an optimization program which minimizes the sum of absolute errors between the predicted and the measured LAeq. Real road experiments are conducted to verify the effectiveness and feasibility of the modeling method. The mean error of the model deduced by the method and the ASJ-2013 model is respectively 0.4 dB and 2.6 dB, and the mean absolute error of the two models is respectively 1.1 dB and 2.6 dB. The results of the real road experiments show that the road traffic noise sources deduced by the method are more accurate to conduct local noise prediction than those of other models.

Triaxial induction logging: New interpretation method for biaxial anisotropic formations — Part 1

2016 ◽  
Vol 4 (2) ◽  
pp. SF151-SF164 ◽  
Author(s):  
Sofia Davydycheva ◽  
Alexandr Kaminsky
Keyword(s):  
Modeling Method ◽  
Theory And Practice ◽  
Electromagnetic Modeling ◽  
3D Inversion ◽  
Resistivity Logs ◽  
Anisotropic Formation ◽  
Anisotropy Tensor ◽  
Shale Reservoirs ◽  
New Interpretation ◽  
New Feature

Due to recent advances in resistivity well logging theory and practice, new triaxial induction tools sensitive to resistivity anisotropy have been developed. We have used the new sensitivities of these tools and developed 1D-3D inversion schemes capable to reveal details of highly laminated shale reservoirs. The ability to simulate responses of the new tools to arbitrary anisotropic 3D media is key to their successful application. We have examined a new fast 1D electromagnetic modeling method to simulate triaxial logging tool responses. The method is used as a forward engine for a new 1D inversion scheme for anisotropic formation parameters. An important new feature of the modeling method is its ability to model new tool responses to biaxial anisotropic medium, whose anisotropy tensor has up to three different principal values. This feature is particularly useful to evaluate anisotropic and fractured formations. We have also developed a universal medium-independent 3D modeling technique that can simulate new-generation tool responses in arbitrary 3D media including fracturing, and we used it as a full 3D inversion engine. Synthetic responses and several 1D-3D inversion results for a practical triaxial induction tool illustrate new features of the resistivity logs and their applications. The new 3D inversion does not require any preprocessing borehole correction, which can introduce significant errors at bed boundaries and in thin laminations. As a result, a higher spatial resolution of the tool can be provided. The new method was used to demonstrate and exploit high sensitivities of triaxial tensor measurement to all three principal values of the conductivity tensor.

Measurement of the source impedance of conducted emission using mode separable LISN: Conducted emission of a switching power supply

2002 ◽  
Vol 139 (2) ◽  
pp. 72-78 ◽  
Author(s):  
Junichi Miyashita ◽  
Masayuki Mitsuzawa ◽  
Toshiyuki Karube ◽  
Kiyohito Yamasawa ◽  
Toshiro Sato
Keyword(s):  
Power Supply ◽  
Switching Power Supply ◽  
Switching Power ◽  
Source Impedance ◽  
Conducted Emission

Research on Modular Modeling Method of Reactor Coolant System Based on THEATRe

2014 ◽  
Author(s):  
Bo Shi ◽  
Zhao-Fei Tian
Keyword(s):  
Real Time ◽  
Data Exchange ◽  
Reactor Core ◽  
Simulation Software ◽  
Modeling Method ◽  
Time Step ◽  
Coolant Pump ◽  
Modular Modeling ◽  
Reactor Coolant ◽  
Coolant System

At present, research on the reactor coolant system is less yet, though modular modeling method has been widely used in the second-loop system of reactor. This paper takes the reactor coolant system of Qinshan-1 nuclear power plant as the object of study, analyses and researches on modular modeling method of reactor coolant system based on THEATRe, which is a large Thermal-Hydraulic real time simulation software developed by GSE Company and adopts NMNP (Nodal Momentum Nodal Pressure) solving method. This research establishes the modular model of the reactor coolant system equipments (including reactor core, main coolant pump, pressurizer, steam generator) using the THEATRe code. Due to each module is wrote into through different input cards, they can be solved by using their own matrix of velocity-pressure to guarantee the independence of the numerical calculation for different modular modules. THEATRe code does not have its own TDV like relap-5, meanwhile it also needs to ensure the pressurizer module can play a role in the multi-pressure node system. So this paper modifies solving method of the THEATRe source code to get suitable pressure boundary and flux boundary for RCS equipment modular module, and selects reasonable time step and data exchange frequency to achieve the data exchange of boundary pressure, flux and enthalpy among the equipment modules, which lays the foundation of establishing the real-time modular simulation model of the reactor coolant system in the future.

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