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A stepless-power-reconfigurable converter for a constant current underwater observatory Research Article
Yujia Zang, Yanhu Chen, Canjun Yang, Haoyu Zhang, Zhiyong Duan, Gul Muhammad,yanhuchen@zju.edu.cn
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 12, Pages 1551-1684 doi: 10.1631/FITEE.2100259
Keywords： 恒流/恒压转换；并联稳压器；无级功率重构；水下观测网
A new approach for analyzing the effect of non-ideal power supply on a constant current underwater cabled system Personal View
Yu-jia ZANG, Yan-hu CHEN, Can-jun YANG, De-jun LI, Ze-jian CHEN, Gul MUHAMMAD
Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 4, Pages 604-614 doi: 10.1631/FITEE.1800737
Keywords： Non-ideal power supply Constant current input Ocean observation system
Wang Shoudong,Shen Yongming,Jiang Hengzhi
Strategic Study of CAE 2007, Volume 9, Issue 12, Pages 26-30
Firstly, based on node equation method, a water distribution pipeline network steady flow mathematical model is established and is solved by using the Newton iteration method. Secondly, the mathematic model for transient flow set up by characteristic method can be used to forecast the harmful water hammer occurring in operation of the system, and to find the possible occurrence of the maximum (minimum) hydraulic pressure and their corresponding happened place. Sample shows that they are reliable models which have excellent computing efficiency and high order. The results are that these models can be applied to hydraulic balance calculation for city's water distribution pipeline network and provide the theoretic basis for designer to adopt measures preventing from water hammer.
Keywords： water distribution pipeline network steady flow transient flow water hammer Newton’s iteration method
Power system design for constant current subsea observatories Regular Article
Yan-hu Chen, Sa Xiao, De-jun Li,yanhuchen@zju.edu.cn,sxiao@zju.edu.cn,li_dejun@zju.edu.cn
Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 11, Pages 1505-1515 doi: 10.1631/FITEE.1800362
Keywords： 海底观测网；电能变换；散热
The Following-observing Method for Substance Flow Analysis
Lu Zhongwu
Strategic Study of CAE 2006, Volume 8, Issue 1, Pages 18-25
The fundamental argument set forth in the paper is that flow is the common feature of fluid flow and substance flow. In view of this, a short review of two ways of describing the motion of fluid in fluid-dynamics was given: one of them was developed by Lagrange, and the other-by Euler. Correspondingly, two methods for substance flow analysis were advanced : one of them is “ following-observing ” method, and the other-“standing-observing” method. The exposition was focused on the former, because it is the new one, on which no information could be found in literature. It is emphasized that the following-observing method is applicable not only for studying steady substance flow (constant output of product), but also for unsteady substance flow (increasing or decreasing output of product). The following-observing model of substance flow was explained by using iron flow diagram in the life cycle of steel products. Introducing the degree of unsteady-state, a set of basic equations for calculating the indexes of substance flow and the relationship between them were derived. The lead flow in Swedish lead-acid battery system was analyzed as a case study, including the calculation of indexes of lead flow.
Keywords： methods of substance flow analysis following-observing method for substance flow analysis basic equations for substance flow analysis degree of unsteadiness of substance flow
A Versatile Flow-Profile Engineering Method in the Stokes Flow Regime for Complex-Shaped Flows Article
Zhenyu Yang, Lang Nan, Ho Cheung Shum
Engineering 2021, Volume 7, Issue 5, Pages 655-662 doi: 10.1016/j.eng.2021.02.008
Flow profiles are frequently engineered in microfluidic channels for enhanced mixing, reaction control, and material synthesis. Conventionally, flow profiles are engineered by inducing inertial secondary flow to redistribute the streams, which can hardly be reproduced in microfluidic environments with negligible inertial flow. The employed symmetric channel structures also limit the variety of achievable flow profiles. Moreover, each of the flow profiles specifically corresponds to a strictly defined flow condition and cannot be generalized to other flow environments. To address these issues, we present a systematic method to engineer the flow profile using inertialess secondary flow. The flow is manipulated in the Stokes regime by deploying a cascaded series of microsteps with various morphologies inside a microchannel to shape the flow profile. By tuning the shapes of the microsteps, arbitrary outflow profiles can be customized. A numerical profile-transformation program is developed for rapid prediction of the output profiles of arbitrary sequences of predefined microsteps. The proposed method allows the engineering of stable flow profiles, including asymmetric ones, over a wide range of flow conditions for complex microfluidic environmental prediction and design.
Keywords： Microfluidics Flow profile Stokes flow Hydrodynamic focusing Flow shaping
Wu Yong,Zhang Guanglie,Zheng Nanning,Zhang Xia
Strategic Study of CAE 2001, Volume 3, Issue 4, Pages 56-62
In this paper, a new adaptive frame rate upconversion algorithm is presented, and its rapid implementation method in hardware is further discussed. With inner parameters and weighted block-matching error, the algorithm implements adaptive motion compensation. Therefore, this algorithm can effectively reduce the noise-interference and the hardware realization complexity. By using a look-up table that corresponds to the adjustable parameter and employing FPGA, the algorithm for scan format conversion is realized. Its application in practical system shows that this algorithm is very efficient.
Keywords： scan format conversion frame rate up-conversion block-matching motion compensation
A Motion-Adaptive Algorithm for Video Scan Format Conversion and the Hardware Implementation
Zhang Guanglie,Zheng Nanning,Wu Yong,Zhang Xia
Strategic Study of CAE 2001, Volume 3, Issue 6, Pages 41-47
Along with the development of digital processing TV and new-generation TV fully digitalized, video scan format conversion has become an important technology. In this paper, by incorporateing noise-reduced filter with edge-preserved into motion adaptive deinterlacing algorithm, a new algorithm for scan format conversion is proposed. The principle and structure for implementing this algorithm in hardware are discussed. Accordingly, the simulation experiment in FPGA (Field-Programmable Gate Arrays) is designed. The experimental results show that the algorithm proposed in the paper is very efficient.
Keywords： scan format conversion motion adaptive deinterlacing edge-preserved noise-reduced filter
A Video Scan Format Conversation Algorithm Based onSpatio-temporal Weight and Edge Direction
Ding Yong,Lu Shengli,Shi Longxing
Strategic Study of CAE 2007, Volume 9, Issue 10, Pages 49-54
De-interlace is to convert interlaced images to progressive ones. In this paper, a de-interlacing algorithm based on spatio-temporal weight and edge direction is presented. It consists of motion detection, low-angle edge detection, and spatio-temporal weight adaptive interpolation. It uses total 4 fields information captured in field storage to detect the presence of motion. And it detects low-angle edge by an adaptive searching radius in which the 6°edge is obtained. The proposed method using spatio-temporal adaptive interpolation can obtain quite good display quality and satisfies real-time process of HDTV sequences.
Keywords： scan format conversation motion estimation edge detection spatio-temporal adaptive interpolation de-interlace
Chen Maozhang,Peng Bo
Strategic Study of CAE 2000, Volume 2, Issue 2, Pages 15-23
A disturbance vortex method for simulating rotor/stator interaction in turbomachinery was developed[1,2]. This method has some obvious advantages in simulating unsteady flow in turbomachinery, such as understandable physical picture and good convergency. However, there is an important simplification in reference 1, which ignores the disturbance expansion. As a result, the computational process is greatly simplified. The main purpose of the present paper is to take the disturbance expansion into consideration with the aim to lay down a solid mathematical and physical foundation for the disturbance vortex method. Since the disturbance expansion has been taken into account, one has to solve the mass, vorticity transport and energy transport equations for disturbance motion in a coupled way. These are the main differences between the present paperand reference 1.
To validate the computational method, the unsteady flows caused by rotor/stator interaction in the first stage of NASA - 67 compressor were simulated in reference 1. And unsteady velocity correlation parameters at several locations inside the passage were compared with the experimental data. In order to find out the influence of ignoring the disturbance expansion on computational results, the same example was studied in the present paper. From the simulation results it can seen that the disturbance vortex method still converges fast even the disturbance expansion is taken into consideration.
It is noted that the additional velocity component which is needed to meet the nonpenetrate condition on the body surface is expressed by an elliptic-type Laplace equation rather than a hyperbolic-type equation even the flow is unsteady and compressible. It is also noted that setting the disturbance expansion to be zero is not equivalent to an incompressible disturbance motion.
Keywords： turbomachinery rotor/stator interaction disturbance vortex method compressible flow unsteady flow
Integrated Energy Microgrids and Low-Carbon Operation Optimization of Coal Mining Areas
Mu Yunfei,Wu Zhijun,Guo Haochen,Jia Hongjie,Wang Chengshan
Strategic Study of CAE 2023, Volume 25, Issue 5, Pages 111-121 doi: 10.15302/J-SSCAE-2023.05.010
Currently, the isolated development of energy in the coal mining areas and the energy supply mode based on coal power generation and grid power supply can no longer satisfy the requirements for implementing clean coal-mining and building a new energy development pattern that is green, low-carbon, and recyclable. Therefore, it is necessary to build integrated energy microgrids in the coal mining areas to enhance the comprehensive utilization of energy and control carbon emissions in these areas. This study explores the demand for and natural advantages of integrated energy microgrids application in the coal mining areas, proposes an integrated energy microgrid framework, and analyzes the development elements of the framework: new energy generation, energy storage, associated energy utilization, multi-energy coupling, and optimal scheduling of energy. A material‒energy‒carbon hub model is established in the coal mining areas, realizing low-carbon operation optimization based on carbon ‒ energy synergy of integrated energy microgrids in typical coal mining areas. The results indicate that the application of integrated energy microgrids in coal mining areas can fully exploit and efficiently integrate the advantages of resources such as wind, solar energy, gas, air heat, and gushing water heat, and energy storage devices can further improve the match degree between energy supply and load demand, thereby reducing the amount of power purchased from the power grid and the carbon emissions from electricity consumption in the coal mining areas. The low-carbon operation optimization process takes into account the carbon‒energy coupling of various types of equipment and supports the formulation of low-carbon and economical operation strategies. This study is expected to provide new concepts and technical support for the high-quality economic and social development of coal mining areas.
Keywords： coal mining areas integrated energy microgrids material‒energy‒carbon hub model carbon-energy synergy low-carbon operation optimization
Simulation Algorithm of Flightdeck Airflow Based on Neural Network
Xun Wensheng,Lin Ming
Strategic Study of CAE 2003, Volume 5, Issue 5, Pages 76-79
The airflow on the flightdeck is an important factor which influences helicopter flight safety. The airflow velocity distribution characteristics directly influences simulation accuracy of helicopter flight dynamics. Based on the Navier-Stokes equations, the method to determine the airflow velocity in real-time is discussed using BP neural network. This method can be used for flightdeck airflow real-time simulation, and it can improve helicopter flight simulation accuracy.
Keywords： flow finite element neural network
Study and Application of Steady Flow and Unsteady Flow Mathematical Model for Canal Networks
Zhang Mingliang,Shen Yongming
Strategic Study of CAE 2007, Volume 9, Issue 8, Pages 92-96
Based on Preissmann implicit scheme for one-dimensional Saint-Venant Equation, the mathematical model for one- dimensional river networks and canal networks is developed and the key issues on the model are expatiated particularly in this paper. This model is applied to simulating the tree-type irrigation canal networks and complex looped canal networks. The results of levels and flows and discharge distribution between the branches agree with the data from Adlul. This model is a simple and practical tool for water resource regulation of irrigation canal networks and river networks. These results show the application value of this model is to set up ecological numerical model of water quality in river networks and canal networks.
Keywords： Preissmann implicit scheme canal networks and river networks discharge distribution water quality mode
Editorial for Additive Manufacturing
Bingheng Lu
Engineering 2019, Volume 5, Issue 4, Pages 597-597 doi: 10.1016/j.eng.2019.06.004
Daiqi Li, Bin Tang, Deshan Cheng, Jing Wu, Wenyang Tang, Zhao Zhong, Jianqiang Li, Guangming Cai, Jinfeng Wang, Xungai Wang
Engineering 2023, Volume 21, Issue 2, Pages 143-151 doi: 10.1016/j.eng.2021.12.017
A conductive ceramic composite (CCC) based on carbonized phenolic resin is fabricated via a facile and scalable dry-pressing method. A conductive carbonaceous precursor solution is homogeneously mixed with a ceramic precursor. Subsequently, carbonization and ceramicization are achieved simultaneously in a single heating process. The carbonized materials endow the composites with excellent electrical conductivity and reliable cyclic heating properties. The temperature of the obtained composites is approximately 386 °C at 12 V after 10 min and 400 °C at 20 V after 48 s, and their low energy consumption is low. Thermal images show that an even heat distribution is achieved on the composite surface, and that the electro–thermal performance can be adjusted by changing the electrical circuit arrangement (series or parallel circuits). In addition, the ceramic composites exhibit favorable electromagnetic interference shielding performance of 26.2 dB at 8.2 GHz and improved photothermal conversion effect compared with the pristine ceramic. More importantly, this single-step heating provides a convenient and cost-effective approach for producing CCCs, thereby enabling the scalable production of conductive ceramics for electro–thermal applications. The excellent electrical performance facilitates the application of ceramic composites in Joule heating (e.g., deicing, boiling water, and cooking) and electromagnetic interference shielding.
Keywords： Conductive ceramic composite Electro–thermal performance Electromagnetic interference shielding Carbonization
Title Author Date Type Operation
A stepless-power-reconfigurable converter for a constant current underwater observatory
Yujia Zang, Yanhu Chen, Canjun Yang, Haoyu Zhang, Zhiyong Duan, Gul Muhammad,yanhuchen@zju.edu.cn
Journal Article
A new approach for analyzing the effect of non-ideal power supply on a constant current underwater cabled system
Yu-jia ZANG, Yan-hu CHEN, Can-jun YANG, De-jun LI, Ze-jian CHEN, Gul MUHAMMAD
Journal Article
The Study on Steady Flow and Transient Flow Mathematical Models for City’s Water Distribution Pipeline Network
Wang Shoudong,Shen Yongming,Jiang Hengzhi
Journal Article
Power system design for constant current subsea observatories
Yan-hu Chen, Sa Xiao, De-jun Li,yanhuchen@zju.edu.cn,sxiao@zju.edu.cn,li_dejun@zju.edu.cn
Journal Article
A Versatile Flow-Profile Engineering Method in the Stokes Flow Regime for Complex-Shaped Flows
Zhenyu Yang, Lang Nan, Ho Cheung Shum
Journal Article
A New Adaptive Frame Rate Upconversion Algorithm for Scan Rate Conversion and Its FPGA Implementation
Wu Yong,Zhang Guanglie,Zheng Nanning,Zhang Xia
Journal Article
A Motion-Adaptive Algorithm for Video Scan Format Conversion and the Hardware Implementation
Zhang Guanglie,Zheng Nanning,Wu Yong,Zhang Xia
Journal Article
A Video Scan Format Conversation Algorithm Based onSpatio-temporal Weight and Edge Direction
Ding Yong,Lu Shengli,Shi Longxing
Journal Article
Numerical Simulation of Rotor/Stator Interaction in Turbomachinery by Use of a Disturbance Vortex Method for Compressible Flow
Chen Maozhang,Peng Bo
Journal Article
Integrated Energy Microgrids and Low-Carbon Operation Optimization of Coal Mining Areas
Mu Yunfei,Wu Zhijun,Guo Haochen,Jia Hongjie,Wang Chengshan
Journal Article
Simulation Algorithm of Flightdeck Airflow Based on Neural Network
Xun Wensheng,Lin Ming
Journal Article
Study and Application of Steady Flow and Unsteady Flow Mathematical Model for Canal Networks
Zhang Mingliang,Shen Yongming
Journal Article
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