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Journal of Modern Power Systems and Clean Energy 2020年第2期8卷 325-333页

作者： Tianyu Zhang Chengshan Wang Fengzhang Luo Peng Li Liangzhong Yao the Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China State Grid Tianjin Electric Power Company Economic and Technological Research Institute Tianjin 300171China China Electric Power Research Institute Beijing 100192China

An analytical calculation method for the reliability sensitivity indexes of distribution systems is proposed to explicitly quantify the impact of various influence factors on system ***,the analytical calculation formulas for the reliability indexes of distribution systems are derived based on the fault incidence matrix(FIM).Secondly,the factors that affect system reliability are divided into two categories:quantifiable parameter factors and non-quantifiable network structure *** sensitivity indexes for the quantifiable parameter factors are derived using the direct partial derivation of the reliability calculation *** sensitivity indexes for the nonquantifiable network structure factors are derived using the transformation of ***,the accuracy and efficiency of the proposed sensitivity calculation method are verified by applying them to an IEEE 6-bus RBTS *** paper sums up the factors that influence system reliability in detail and gives the explicit analytical calculation method for the sensitivity of each *** calculation of the reliability index can be avoided during the sensitivity *** bottleneck that affects the reliability level of distribution systems can be identified efficiently,and valuable information and guidance can be provided to enhance the reliability of distribution systems.

关键词： Distribution system reliability fault incidence matrix reliability sensitivity analytical calculation

analytical calculation method and simulation of deformation and stress of Z-type guide arm for interconnected air suspensions

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International Journal of Modeling, Simulation, and Scientific Computing 2021年第4期12卷 41-57页

作者： Zhongliang Zhang Leilei Zhao School of Transportation and Vehicle Engineering Shandong University of Technology Zibo 255000P.R.China School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai 200093 P.R.China

To design and check the strength of the Z-type guide arm of interconnected air suspensions for semi-trailers rapidly and effectively,this paper proposes the analytical calculation methods of its deformation and ***,based on the guide arm structure,it is marked as two parts by its mountpoint on the axle as the *** part containing the eye was marked as *** other part was marked as *** the analytical formulas of their stiffness and stress were derived,*** a case study,the deformation and the stress were computed and *** results show that the values computed are close to those *** relative deviations are not more than 5.0%.The results show that the analytical formulas are ***,it can be seen that for the superimposed Arm-1,when the other structural parameters are fixed,the position of the maximum stress is affected by the thickness ratio of the end thickness to the root thickness for each ***,a stiffness test was performed on the Z-type guide *** results show that the computed stiffness values are closed to those tested and the relative deviations are not more than 3.5%.This further verified the validity of the established model and methods.

关键词： Semi-trailers interconnected air suspensions Z-type guide arm deformation stress analytical calculation

Temperature Field in Laser Line Scanning Thermography: analytical calculation and Experiment

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Computer Modeling in Engineering & Sciences 2023年第10期137卷 1001-1018页

作者： Yin Li Yuanjia Song Zhengwei Yang Haijun Jiang Bowen Liu China Aerodynamics Research and Development Center Mianyang621000China Xi’an Research Institute of High Technology Xi’an710025China Nanjing Novelteq Ltd.Nanjing210038China

The temperature field in laser line scanning thermography is investigated comprehensively in this work,including analytical calculation and ***,the principle of laser line scanning thermography is *** this basis,a physical laser line scanning model is ***,based on Fourier transform(FT)and segregation variablemethod(SVM),the heat conduction differential equation in laser line scanning thermography is derived in *** temperature field of the composite-based coatings model with defects is simulated *** results show that the laser line scanning thermography can effectively detect the defects in the *** correctness of the analytical calculation is verified by comparing the surface temperature distribution obtained by analytical calculation and numerical ***,an experiment is carried out and the changeable surface temperature obtained by analytical calculation is compared with the experimental *** shows that the error of maximum temperature obtained by analytical calculation and by experiment is 8%with high accuracy,which proves the correctness of analytical calculation and enriches the theoretical foundation of laser line scanning thermography.

关键词： Temperature field laser line scanning thermography analytical calculation numerical simulation experiment

analytical calculation of the Energy in a Permanent Magnet

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Journal of Modern Physics 2016年第16期7卷 2281-2287页

作者： Jean-Paul Yonnet Christian Chillet Hicham Allag Lotfi Chouikhi Laboratoire de Génie Electrique de Grenoble G2E Lab Université Grenoble Alpes Grenoble France Laboratoire de Génie Electrique de Grenoble G2E Lab CNRS Grenoble France Laboratoire d’Electronique et d’Electrotechnique Industrielle Jijel University Jijel Algeria

The energy in permanent magnet is not a trivial problem because it exist two types of energy: the field energy and the demagnetizing energy. For parallelepiped shape, the magnet energy has been calculated by fully analytical expressions in 3D. The result has been obtained after four successive integrations of Arctangent and Logarithm functions. The analytically calculated energy corresponds to the demagnetization energy in the magnet. The analytical results have been compared with different terms of energy obtained by computation.

关键词： analytical calculation Energy Permanent Magnet

Theoretical and Computational Analyses of LNG Evaporator

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Journal of Thermal Science 2017年第2期26卷 132-137页

作者： Palani Kumar Chidambaram Yang Myung Jo Heuy Dong Kim FMTRC Daejoo Machinery Co Ltd Department Mechanical Engineering Andong National University

Theoretical and numerical analysis on the fluid flow and heat transfer inside a LNG evaporator is conducted in this work. Methane is used instead of LNG as the operating fluid. This is because; methane constitutes over 80% of natural gas. The analytical calculations are performed using simple mass and energy balance equations. The analytical calculations are made to assess the pressure and temperature variations in the steam tube. Multiphase numerical simulations are performed by solving the governing equations(basic flow equations of continuity, momentum and energy equations) in a portion of the evaporator domain consisting of a single steam pipe. The flow equations are solved along with equations of species transport. Multiphase modeling is incorporated using VOF method. Liquid methane is the primary phase. It vaporizes into the secondary phase gaseous methane. Steam is another secondary phase which flows through the heating coils. Turbulence is modeled by a two equation turbulence model. Both the theoretical and numerical predictions are seen to match well with each other. Further parametric studies are planned based on the current research.

关键词： LNG Evaporator analytical calculation Numerical Simulation

analytical modeling and simulation on lateral mechanical characteristics of high-speed train traction motor hanging leaf spring

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International Journal of Modeling, Simulation, and Scientific Computing 2019年第3期10卷 146-163页

作者： Yuewei Yu Leilei Zhao Changcheng Zhou School of Transportation and Vehicle Engineering Shandong University of Technology ZiboP.R.China School of Automation Beijing University of Posts and TelecommunicationsBeijingP.R.China

In this paper,using the theoretical analysis method,according to the actual structure of the hanging leaf spring of the traction motor mounted on the frame,the lateral force model of the hanging leaf spring of the traction motor was ***,through theoretical deduction,the deformation analytical calculation formula and the stress analytical calculation formula of the hanging leaf spring were *** correctness of the leaf spring’s lateral force model was established and its deformation and stress analytical formulae were verified using ANSYS finite element analysis *** on this,according to the deformation analytical formula and the stress analytical formula of the leaf spring established,the influence of the main structural parameters on the mechanical characteristics of the leaf spring was discussed,and the reliability of the analytical analysis method of the lateral mechanical characteristics of the traction motor hanging leaf spring was verified by the loading–unloading *** results show that the deformation and the load of the leaf spring change *** changes of leaf spring’s stress at different positions can be considered as being composed of three sections:a linear change section in the root,a nonlinear change section in the middle,and a nonlinear change section in the *** the structural parameters,the end thickness h2 has the greatest influence on the stiffness and the stress of the leaf spring,and the maximum thickness of the leaf spring eye h1 has the least influence on the stiffness and the stress of the leaf *** influence degree of other parameters on the stiffness of the leaf spring is h_(3),L_(1),L_(3),L_(2) in order,and the influence degree on the stress of the leaf spring is h_(3),L_(1),L_(2),L_(3) in *** addition,when the root thickness h_(3) is greater than a certain value,the maximum stress point of the leaf spring appears at the end position L_(2).This study can provide a useful reference for

关键词： High-speed train traction motor hanging leaf spring analytical calculation lateral mechanical characteristics analysis

Behaviour and Analysis of Horizontally Curved Steel Box-Girder Bridges

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Open Journal of Civil Engineering 2022年第3期12卷 390-414页

作者： Mattia Mairone Rebecca Asso Davide Masera Pietro Palumbo Research and Development Masera Engineering Group S.r.l Corso Re Umberto 8 Torino Italy Department of Structural Geotechnical and Building Engineering DISEG Politecnico di Torino Corso Duca degli Abruzzi 24 Torino Italy Masera Engineering Group S.r.l. Corso Re Umberto 8 Torino Italy

Various theories and analytical formulations were implemented and exploited in the 1980s and 1990s for the design of bridge beams or decks curved in the horizontal plane and subjected to out-of-plane loads. Nowadays, the Finite Element Method (FEM) is a valid tool for the analysis of structures with complex geometries and, therefore, the development of sophisticated analytical formulations is not needed anymore. However, they are still useful for the validation of FE models. This paper presents the case study of an existing viaduct built in North Italy, aiming to compare analytical approaches and numerical modelling. The bridge is characterized by an axis curved in two directions and a rectilinear segment. The global analysis of the viaduct is carried out with special attention to the attributes that cause torque action and bending moment. The theoretical developments focus on a deeper understanding of the torsional response under different constraint and loading conditions and aspire to raise awareness of the mutual interaction of flexural and torsional behaviour, that are always present in these complex curved systems. The examination of the case study is also obtained by comparing the response of isostatic and hyperstatic curvilinear steel box-girders.

关键词： analytical calculation Bridges Horizontally Curved Beam Structural Response Torsion

EMF Waveform Optimization using the Permanent Magnet Volume-Integration Method

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CES Transactions on Electrical Machines and Systems 2017年第2期1卷 189-198页

作者： Maxime R.Dubois João P.Trovão Universitéde Sherbrooke Electrical and Computer Engineering DepartmentSherbrookeQCCANADA

The emf expression can be derived with the PM volume-integration method,allowing easier optimization and prediction of the emf harmonic *** analytical expression is developed for predicting the electromotive force(emf)waveforms and flux linkage resulting from the motion of permanent magnets(PM)in the case of two cylinders,where the outer cylinder carries a surface-mounted winding and the inner cylinder carries the *** expressions are based on the PM Volume-Integration Method,which uses a volume integral calculated over the magnet volume,rather than the usual surface integral over the coil *** specific case of surface-mounted arc PM with radial magnetization is *** outer cylinder with infinitely thin winding distribution on its inner surface is *** chording factor,slot factor and spread factor are included in the analytical *** emf waveform and related harmonics are predicted analytically and validated by comparing with a finite element analysis and with experiment.

关键词： Permanent magnet machines analytical calculation electromotive force magnet width harmonics surface-mounted radial magnetization optimization and prediction of emf harmonics