Search scope:
排序： Display mode:
A data-driven method for estimating the target position of low-frequency sound sources in shallow seas Research Articles
Xianbin Sun, Xinming Jia, Yi Zheng, Zhen Wang,robin_sun@qut.edu.cn,jiaxinming_123@163.com
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 7, Pages 1020-1030 doi: 10.1631/FITEE.2000181
Keywords： 矢量水听器；浅海；低频；位置估计；循环神经网络
Meng WANG, Jia-qiang YANG, Xiang ZHANG, Chang-sheng ZHU
Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 4, Pages 569-581 doi: 10.1631/FITEE.1601390
Keywords： Permanent magnet synchronous machine (PMSM) Discrete-time current controller Complex vector
Vector soliton and noise-like pulse generation using a Ti3C2 MXene material in a fiber laser Research
Shuai Wang, Lei Li, Yu-feng Song, Ding-yuan Tang, De-yuan Shen, Lu-ming Zhao,sdulilei@gmail.com,lmzhao@ieee.org
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 3, Pages 287-436 doi: 10.1631/FITEE.2000033
Keywords： 矢量孤子；类噪声脉冲；MXene；光纤激光器
Xia Ruofei,Zhu Longji,Zhu Hong,Lu Kang
Strategic Study of CAE 2014, Volume 16, Issue 8, Pages 79-82
In this paper, for achieving fast speed response and stabily statical characteristics in permanent magnet synchronous motor, a vector control system based on DSP is introduced. The vector control is embedded into the control systerm, and the mathematical mode and driving principle is given. The simulation and experiment result show this vector control syserm is highly dynamic, meeting the requirements of control system for hybrid electric vehicles, achieving the desired design goals, making the permanent magnet synchronous motor gets fast speed response and stabily statical characteristics
Keywords： electric vehicles vector control DSP permanent magnet synchronous motor
Haoxuan Zheng, Ying Zheng, Jesse Zhu
Engineering 2022, Volume 19, Issue 12, Pages 180-198 doi: 10.1016/j.eng.2022.04.027
Hydrodynamic cavitation is considered to be a promising technology for process intensification, due to its high energy efficiency, cost-effective operation, ability to induce chemical reactions, and scale-up possibilities. In the past decade, advancements have been made in the fundamental understanding of hydrodynamic cavitation and its main variables, which provide a basis for applications of hydrodynamic cavitation in radical-induced chemical reaction processes. Here, we provide an extensive review of these research efforts, including the fundamentals of hydrodynamic cavitation, the design of cavitation reactors, cavitation-induced reaction enhancement, and relevant industrial applications. Two types of hydrodynamic cavitation reactors—namely, stationary and rotational—are compared. The design parameters of a hydrodynamic cavitation reactor and reactor performance at the laboratory and pilot scales are discussed, and recommendations are made regarding optimal operation and geometric conditions. The commercial cavitation reactors that are currently on the market are reviewed here for the first time. The unique features of hydrodynamic cavitation have been widely applied to various chemical reactions, such as oxidization reactions and wastewater treatment, and to physical processes, such as emulsion generation and component extraction. The roles of radicals and gas bubble implosion are also thoroughly discussed.
Keywords： Hydrodynamic cavitation Cavitation nuclei Hydroxyl radicals Stationary/rotational hydrodynamic cavitation reactor Reaction enhancement Cavitation application
On the Order Reduction of Dynamics Models of Flexible Spacecrafts
Miao Bingqi,Qu Guangji,Xia Suiqin,Cheng Daosheng
Strategic Study of CAE 2001, Volume 3, Issue 11, Pages 60-64
The usual mode sets for the dynamics modeling of flexible spacecraft are reviewed. Some mode reduction criterions for the selection of system retained modes are summarized. It is pointed out that the modal cost analysis and the internal balance theory are for the system mode selection and there is the problem how to use these criterions for the component elastic mode or the system elastic deformation mode selection. A tactic for using the order reduction criterions for the dynamics modeling is introduced. An example is given to show the comparison of modeling results with different mode sets and to illustrate how to use the mode reduction criterions for the dynamics modeling of flexible spacecraft.
Keywords： spacecraft flexible bodies dynamics reduction of models
The study on oceanic vector wind field retrieve technique of the HY-2 satellite
Jiang Xingwei,Lin Mingsen
Strategic Study of CAE 2009, Volume 11, Issue 10, Pages 86-95
A retrieving oceanic vector wind algorithm and the precision analysis of its error in accordance with the HY-2 satellite's microwave scatterometer was put forward in the paper, and a technical process of data acquisition, pre-process, wind vector retrieve and production manufacture about the HY-2 satellite microwave scatterometer was also given. It will be ready on technology for making a due ontribution once the HY-2 satellite is launched and promotes our country's oceanic microwave remote sensing technique development.
Keywords： HY-2 satellite microwave scatterometer wind firld retrieve vector wind filed error analysis
Xiao Jinbiao,Sun Xiaohan,Zhang Mingde,Ding Dong
Strategic Study of CAE 2001, Volume 3, Issue 11, Pages 49-53
Vectorial eigenmodes supported by the buried rectangular and rib optical waveguides are obtained using variable transformed series expansion method. The infinite x-y plane is mapped into a unit square by an elegant tangent-type variable transformation. Consequently, the boundary truncation is not necessary, and the nonphysical reflection is eliminated. As a result, the calculation accuracy is promoted. In addition, small matrix derived from this method promotes the computational efficiency. Comparatively agreeing with those previously published, the results can be used to optimize the photonic devices.
Keywords： variable transformed series expansion method optical waveguides vectorial eigenmode analysis
Upstream Operations in the Oil Industry: Rigorous Modeling of an Electrostatic Coalescer
Francesco Rossi, Simone Colombo, Sauro Pierucci, Eliseo Ranzi, Flavio Manenti
Engineering 2017, Volume 3, Issue 2, Pages 220-231 doi: 10.1016/J.ENG.2017.02.013
This paper deals with a first-principle mathematical model that describes the electrostatic coalescer units devoted to the separation of water from oil in water-in-oil emulsions, which are typical of the upstream operations in oil fields. The main phenomena governing the behavior of the electrostatic coalescer are described, starting from fundamental laws. In addition, the gradual coalescence of the emulsion droplets is considered in the mathematical modeling in a dynamic fashion, as the phenomenon is identified as a key step in the overall yield of the unit operation. The resulting differential system with boundary conditions is then integrated via performing numerical libraries, and the simulation results confirm the available literature and the industrial data. A sensitivity analysis is provided with respect to the main parameters. The mathematical model results in a flexible tool that is useful for the purposes of design, unit behavior prediction, performance monitoring, and optimization.
Keywords： Upstream operations Electrostatic coalescer Desalter Rigorous modeling Water-oil emulsion
Chiyu Wen,Hongshuang Guo,Yingnan Zhu,Haoyu Bai,Weiqiang Zhao,Xinsheng Wang,Jing Yang,Moyuan Cao,Lei Zhang
Engineering 2023, Volume 20, Issue 1, Pages 153-161 doi: 10.1016/j.eng.2021.06.029
Highly hydrophilic materials enable rapid water delivery and salt redissolution in solar-driven seawater desalination. However, the lack of independent floatability inhibits heat localization at the air/water interface. In nature, seaweeds with internal gas microvesicles can float near the sea surface to ensure photosynthesis. Here, we have developed a seaweed-inspired, independently floatable, but superhydrophilic
(SIFS) solar evaporator. It needs no extra floatation support and can simultaneously achieve continuous water pumping and heat concentration. The evaporator resists salt accumulation, oil pollution, microbial corrosion, and protein adsorption. Densely packed hollow glass microbeads promote intrinsic floatability and heat insulation. Superhydrophilic zwitterionic sulfobetaine hydrogel provides a continuous water supply, redissolves the deposited salt, and endows the SIFS evaporator with excellent anti-fouling properties. With its unprecedented anti-contamination ability, this SIFS evaporator is expected to open a new avenue for designing floatable superhydrophilic materials and solving realworld
issues of solar steam generation in complex environmental conditions.
Keywords： Superhydrophilic device Bioinspiration Independent floatability Multi-contamination resistance Solar evaporation
Bo Yuan, Xuyang Sun, Jing Liu
Engineering 2020, Volume 6, Issue 12, Pages 1454-1462 doi: 10.1016/j.eng.2019.08.020
Water-triggered materials are receiving increasing attentions due to their diverse capabilities such as easy operation, soft actuation, low cost, environmental friendliness, and many more other advantages. However, most of such materials generally have a long reaction time and require strict preservation conditions, which limit their adaptability in practice. In this study, a novel water-triggered material based on Al-NaOH-composited eutectic gallium–indium alloys (eGaIn) was proposed and demonstrated, which is rather fast-responsive and deformable. Once water is applied, the material thus fabricated would achieve a temperature rise of 40 °C in just several seconds along with gas production, indicating its big potential to be used as a thermal and pneumatic actuator. Further, the new material's reusability and degradation ability were also tested. Following that, a double-layer-structure smart bandage was designed, whose bulk was filled with Al-NaOH-composited eGaIn while BiInSn served as outer supporting material. According to the experiments, a sheet structure with a thickness of 2 mm would support a weight of 1.8 kg after it was subjected to a cooling process, which is much better than the weight-bearing capability of fiberglass. In addition, a prototype of a water-triggered sphere robot was also fabricated using Al-NaOH-eGaIn, which realized rolling and bouncing behaviors under specific external stimulation. These findings indicate the potential value of the present material in developing future wearable devices, soft actuators, and soft robotics.
Keywords： Liquid metal Water-triggered materials Self-heating materials Soft actuator
Research on the data processing methods of airborne vector gravimetry using SINS/GNSS
Ning Jinsheng
Strategic Study of CAE 2014, Volume 16, Issue 3, Pages 4-13
Airborne vector gravimetry is an advanced and efficient technology to determine high frequency information of earth’s gravity field in the future，and is a complement to ground gravimetry，marine gravimetry and satellite gravimetry. The principle of airborne vector gravimetry using SINS（strapdown inertial navigation system）/GNSS（global navigation satellite systems）is introduced in the paper，and then the data preprocessing，data reduction，band-limited topographical effect and downward continuation are discussed，as well as the geoid determination from airborne vector gravimetry. It provides the support for the development of airborne vector gravimetry in our country.
Keywords： airborne vector gravimetry SINS/GNSS data fusion earth gravity field geoid
Validation of wind vectors retrieved by the HY-2A microwave scatterometer using NC EP model data
Mu Bo,Lin Mingsen,Peng Hailong,Song Qingtao,Zhou Wu
Strategic Study of CAE 2014, Volume 16, Issue 6, Pages 39-45
The microwave scatterometer onboard HY-2A Satellite mainly makes measurements of surface wind vectors over the global oceans. In order to ensure that the quality of wind vectors produced by ground application system software,the product must be validated to provide the basis for the quantitative application of the data product.This paper performs the validation of wind vectorsretrieved by HY-2A scatterometer using national centers for environmental prediction (NCEP )model data. The validation result suggests that the validationmethod cangive the precision of the overall wind vectors, and also can be used to analyze the precision characteristics relating with thescanningpencil-beam system and the scatterometer measurement mechanism.Meanwhile the validation can aid to identify the short-term anomaly of measuring performance.
Keywords： microwave scatterometer windvectors inversion validation
Chen-wen CHENG, Heng NIAN, Long-qi LI
Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 11, Pages 1420-1431 doi: 10.1631/FITEE.1601874
Since only one inverter voltage vector is applied during each duty cycle, traditional model predictive direct power control (MPDPC) for grid-connected inverters (GCIs) results in serious harmonics in current and power. Moreover, a high sampling frequency is needed to ensure satisfactory steady-state performance, which is contradictory to its long execution time due to the iterative prediction calculations. To solve these problems, a novel dead-beat MPDPC strategy is proposed, using two active inverter voltage vectors and one zero inverter voltage vector during each duty cycle. Adoption of three inverter vectors ensures a constant switching frequency. Thus, smooth steady-state performance of both current and power can be obtained. Unlike the traditional three-vector based MPDPC strategy, the proposed three vectors are selected based on the power errors rather than the sector where the grid voltage vector is located, which ensures that the duration times of the selected vectors are positive all the time. Iterative calculations of the cost function in traditional predictive control are also removed, which makes the proposed strategy easy to implement on digital signal processors (DSPs) for industrial applications. Results of experiments based on a 1 kW inverter setup validate the feasibility of the proposed three-vector based dead-beat MPDPC strategy.
Keywords： Grid-connected inverter Model predictive control Direct power control Three vectors Constant switching frequency Power errors
A Study on the Essence of Optimal Statistical Uncorrelated Discriminant Vectors
Wu Xiaojun,Yang Jingyu,Wang Shitong,Liu Tongming,Josef Kittler
Strategic Study of CAE 2004, Volume 6, Issue 2, Pages 44-47
A study has been made on the essence of optimal set of uncorrelated discriminant vectors in this paper. A whitening transform has been constructed on the basis of the eigen decomposition of population scatter matrix, which makes the population scatter matrix an identity matrix in the transformed sample space. Thus, the optimal discriminant vectors solved by conventional LDA methods are statistical uncorrelated. The research indicates that the essence of the statistical uncorrelated discriminant transform is the whitening transform plus conventional linear discriminant transform. The distinguished characteristic of the proposed method is that the obtained optimal discriminant vectors are orthogonal and statistical uncorrelated. The proposed method suits for all the problems of algebraic feature extraction. The numerical experiments on facial database of ORL show the effectiveness of the proposed method.
Keywords： pattern recognition feature extraction disciminant analysis generalized optimal set of discriminant vectors face recognition
Title Author Date Type Operation
A data-driven method for estimating the target position of low-frequency sound sources in shallow seas
Xianbin Sun, Xinming Jia, Yi Zheng, Zhen Wang,robin_sun@qut.edu.cn,jiaxinming_123@163.com
Journal Article
Accurate two-degree-of-freedom discrete-time current controller design for PMSM using complex vectors
Meng WANG, Jia-qiang YANG, Xiang ZHANG, Chang-sheng ZHU
Journal Article
Vector soliton and noise-like pulse generation using a Ti3C2 MXene material in a fiber laser
Shuai Wang, Lei Li, Yu-feng Song, Ding-yuan Tang, De-yuan Shen, Lu-ming Zhao,sdulilei@gmail.com,lmzhao@ieee.org
Journal Article
The design of vector control system in hybrid vehicles permanent magnet synchronous motor based on DSP
Xia Ruofei,Zhu Longji,Zhu Hong,Lu Kang
Journal Article
Recent Developments in Hydrodynamic Cavitation Reactors: Cavitation Mechanism, Reactor Design, and Applications
Haoxuan Zheng, Ying Zheng, Jesse Zhu
Journal Article
On the Order Reduction of Dynamics Models of Flexible Spacecrafts
Miao Bingqi,Qu Guangji,Xia Suiqin,Cheng Daosheng
Journal Article
The study on oceanic vector wind field retrieve technique of the HY-2 satellite
Jiang Xingwei,Lin Mingsen
Journal Article
Vectorial Eigenmode Analysis of Optical Waveguides Based on the Variable Transformed Series Expansion Method
Xiao Jinbiao,Sun Xiaohan,Zhang Mingde,Ding Dong
Journal Article
Upstream Operations in the Oil Industry: Rigorous Modeling of an Electrostatic Coalescer
Francesco Rossi, Simone Colombo, Sauro Pierucci, Eliseo Ranzi, Flavio Manenti
Journal Article
Fully Superhydrophilic, Self-Floatable, and Multi-Contamination-Resistant Solar Steam Generator Inspired by Seaweed
Chiyu Wen,Hongshuang Guo,Yingnan Zhu,Haoyu Bai,Weiqiang Zhao,Xinsheng Wang,Jing Yang,Moyuan Cao,Lei Zhang
Journal Article
Al-NaOH-Composited Liquid Metal: A Fast-Response Water-Triggered Material with Thermal and Pneumatic Properties
Bo Yuan, Xuyang Sun, Jing Liu
Journal Article
Research on the data processing methods of airborne vector gravimetry using SINS/GNSS
Ning Jinsheng
Journal Article
Validation of wind vectors retrieved by the HY-2A microwave scatterometer using NC EP model data
Mu Bo,Lin Mingsen,Peng Hailong,Song Qingtao,Zhou Wu
Journal Article
Improved three-vector based dead-beat model predictive direct power control strategy for grid-connected inverters
Chen-wen CHENG, Heng NIAN, Long-qi LI
Journal Article
京公网安备 11010502051620号
