Mechanical performance is an important aspect for the fuel rod performance in LMFR. Operating conditions in LMFR, like large power density, high fast neutron flux and deep burnup, are hash for the fuel rod. The evolut...
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Mechanical performance is an important aspect for the fuel rod performance in LMFR. Operating conditions in LMFR, like large power density, high fast neutron flux and deep burnup, are hash for the fuel rod. The evolution of fuel rod behaviors is complicated and tightly coupled with each other through temperature, stress and burnup. Considering various in-pile behaviors of the fuel rod under fast neutron irradiation, the numerical iterative algorithm based on grid integration was established to deal with the complex nonlinear mechanical problem for the fuel rod in LMFR. Verification and validation have been carried out by comparing results from this algorithm with analytical solutions as well as results from typical code, which are all in good agreement with each other, proving the accuracy and reliability of this algorithm. CO 2022 Elsevier Ltd. All rights reserved.
In order to achieve attitude control of the six degrees of freedom steward dynamic platform, as well as the real time simulation cockpit attitude, Washout Filtering method was adopted in this paper as the simulation a...
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In order to achieve attitude control of the six degrees of freedom steward dynamic platform, as well as the real time simulation cockpit attitude, Washout Filtering method was adopted in this paper as the simulation algorithm to derive Washout Fiher high-pass, low-pass filter transfer functions into a differential equation algorithm and longitudinal acceleration tilt strategy, pitching strategies etc. Experimental examples are used to verify correctness of the algorithm.
In order to achieve attitude control of the six degrees of freedom Steward dynamic platform, as well as the real time simulation cockpit attitude, Washout Filtering method was adopted in this paper as the simulation a...
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In order to achieve attitude control of the six degrees of freedom Steward dynamic platform, as well as the real time simulation cockpit attitude, Washout Filtering method was adopted in this paper as the simulation algorithm to derive Washout Filter high-pass, low-pass filter transfer function into a differential equation algorithm and longitudinal acceleration tilt strategy, pitching strategies etc. Experimental examples are used to verify correctness of the algorithm.
The paper proposes a numerical algorithm for finding a solution set of a class of power-exponent type nonlinear inequalities. The proposed numerical algorithm applies specifically to the case when the power-exponent i...
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The paper proposes a numerical algorithm for finding a solution set of a class of power-exponent type nonlinear inequalities. The proposed numerical algorithm applies specifically to the case when the power-exponent is positive irrational number, which can’t be effectively solved by using the existing methods. Firstly, by introducing a novel concept of margin variable and using the monotonicity of power-exponent function, this paper converts the problem of solving the nonlinear inequalities into a constrained nonlinear optimization (CNO) problem. Then the obtained CNO problem is solved by using the MATLAB function fmincon . Finally, a numerical algorithm to solve this class of inequalities is obtained. The proposed algorithm can find a solution set of the considered inequalities, not just one or few solutions. Further, the derived algorithm can be easily used to calculate the stabilizing parameter ranges for LTI systems based on the Routh-Hurwitz criterion. Moreover, an example of calculating the stabilizing parameters of a LTI system and an example of solving power-exponent type nonlinear inequalities are provided to show the effectiveness of the proposed algorithm.
We present an algorithm to analytically solve two-person affine-quadratic difference games, and to numerically calculate nonlinear quadratic difference games using an appropriate local linearization procedure for a ti...
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We present an algorithm to analytically solve two-person affine-quadratic difference games, and to numerically calculate nonlinear quadratic difference games using an appropriate local linearization procedure for a time-structure relevant for economic modeling. The numerical approximation and the derivation of different solutions of the underlying affine-quadratic dynamic games are explained; in particular, we determine open-loop and feedback Nash and Stackelberg equilibrium solutions and Pareto-optimal solutions.
Since age and sex play an important role in transmission of diseases, we propose a SIR (susceptible-infectious-recovered) model for short-term predictions where the population is divided into subgroups based on both f...
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Since age and sex play an important role in transmission of diseases, we propose a SIR (susceptible-infectious-recovered) model for short-term predictions where the population is divided into subgroups based on both factors without taking into account vital dynamics. After stating our model and its underlining assumptions, we analyze its qualitative behavior thoroughly. We prove global existence and uniqueness, non-negativity, boundedness and certain monotonicity properties of the solution. Furthermore, we develop an explicit-implicit numerical solution algorithm and show that all properties of the continuous solution transfer to its time-discrete version. Finally, we provide one numerical example to illustrate our theoretical findings.
During the parameter properties tests of the ultrasonic nondestructive flaw detector, signal processing will be interfered by two factors, namely, interference from external devices and the random noise results from t...
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ISBN:
(纸本)9781457714146
During the parameter properties tests of the ultrasonic nondestructive flaw detector, signal processing will be interfered by two factors, namely, interference from external devices and the random noise results from the collecting process by the card collection. In this parameter properties tests, it use wavelet transform. This is due to the fact that the former one's frequency division ability as well as its local analysis ability can efficiently eliminate random disturbance, thereby ensuring the high frequency component in the effective wave, and further we can restore the signal effectively through reconstruction. In the purpose of improving accuracy, the apply of the method of the numerical algorithm is recommended during the work next to data preprocessing. The application of curve-fitting makes testing results more accurate.
The paper deals with the uniform finite-time stability(UFTS) of continuous linear time-varying(LTV) ***,a necessary and sufficient condition for the UFTS of continuous LTV systems is devised with the idea of computing...
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The paper deals with the uniform finite-time stability(UFTS) of continuous linear time-varying(LTV) ***,a necessary and sufficient condition for the UFTS of continuous LTV systems is devised with the idea of computing the envelope of all the trajectories of the considered ***,a corollary is obtained under the perspective of numerical ***,based on the obtained corollary,a novel numerical algorithm is designed by utilizing the Lipschitz continuity of certain *** the proposed algorithm,only limited numerical computation is needed when analyzing the UFTS of continuous LTV *** with the existing Lyapunov-like function method,one needn't constructing Lyapunov-like ***,the obtained corollary just requires being checked at a limited number of time ***,two numerical examples are provided to illustrate the effectiveness and superiority of the proposed results.
A reliable energy supply for the economy of every country is a matter of national importance. Powerful simulation tools for natural gas networks are essential for operators of gas networks. In this paper, enhancement ...
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A reliable energy supply for the economy of every country is a matter of national importance. Powerful simulation tools for natural gas networks are essential for operators of gas networks. In this paper, enhancement algorithms of previous developed node potential analysis algorithm are presented. These enhancement algorithms are used for a reasonable setting of initial values in the numerical gas net simulation algorithm. The setting of the initial values has a significant influence on the convergence behavior of the numerical simulation. The presented enhancement algorithms are explained and simulation results are evaluated. Copyright (C) 2020 The Authors.
A numerical computer algorithm is presented here using local density functional theory (DFT) to analyze pore size distribution (PSD) of activated carbons. Density profiles of adsorbate molecules in adsorbent pores are...
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A numerical computer algorithm is presented here using local density functional theory (DFT) to analyze pore size distribution (PSD) of activated carbons. Density profiles of adsorbate molecules in adsorbent pores are calculated, and then the adsorbent's PSD is characterized accordingly. Considering that most available DFT-based software programs report only the PSD results, details of DFT solution procedure is investigated and represented as a numerical algorithm here for the first time. PSD of a granular activated carbon (HD4000) was calculated based on the proposed algorithm, the result of which indicates a similar trend and behaviour with that obtained by DFT PLUS software of Micromeritics ASAP 2010. Also, the activated carbon isotherm evaluated by the proposed algorithm fit the experimental data with a higher accuracy than that estimated by DFT PLUS at lower relative pressures (<0.001).
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