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Recent progress on flutter‐based wind energy harvesting

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International Journal of Mechanical System Dynamics 2022年第1期2卷 82-98页

作者： Zhiyuan Li Shengxi Zhou Zhichun Yang School of Aeronautics Northwestern Polytechnical UniversityXi'anChina Research&Development Institute in Shenzhen Northwestern Polytechnical UniversityShenzhenChina

Wind energy harvesting technology can convert wind energy into electric energy to supply power for microelectronic devices.It has great potential in many specific applications and environments,such as remote areas,sea surfaces,mountains,and so on.Over the past few years,flutter‐based wind energy harvesting,which generates electric energy based on the limit cycle oscillation created by structural aeroelastic instability,has received increasing attention,and as a consequence,different energy harvesting structures,theories,and methods have been proposed.In this paper,three types of flutter‐based energy harvesters(FEHs)including airfoil‐based,flat plate‐based,and flexible body‐based FEHs are reviewed,and related concepts and theoretical models are introduced.The recent progress in FEH performance enhancement methods is classified into structural improvement and optimization,the introduction of nonlinearity,and hybrid structures and mechanisms.Finally,the main FEH challenges are summarized,and future research directions are discussed.

关键词： dynamics flutter performance enhancement wind energy harvesting working principle

Recent advances in photoelectrochemical sensors for detection of ions in water

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Chinese Chemical Letters 2023年第6期34卷 37-48页

作者： Linyang Li Junlian Chen Chuanbao Xiao Yihao Luo Nianbing Zhong Quanhua Xie Haixing Chang Dengjie Zhong Yunlan Xu Mingfu Zhao Qiang Liao Intelligent Fiber Sensing Technology of Chongqing Municipal Engineering Research Center of Institutions of Higher Education Chongqing Key Laboratory of Modern Photoelectric Detection Technology and InstrumentChongqing Key Laboratory of Fiber Optic Sensor and PhotodetectorChongqing University of TechnologyChongqing 400054China Biodesign Swette Center for Environmental Biotechnology Arizona State UniversityTempeAZ 85271-5701United States College of Chemistry and Chemical Engineering Chongqing University of TechnologyChongqing 400054China Key Laboratory of Low-grade Energy Utilization Technologies and Systems(Chongqing University) Ministry of EducationChongqing 400030China

Over the last 50 years,the explosive adoption of modern agricultural practices has led to an enormous increase in the emission of non-biodegradable and highly biotoxic ions into the hydrosphere.Excess intake of such ions,even essential trace elements such as Cu^(2+)and F^(-),can have serious consequences on human health.Therefore,to ensure safe drinking water and regulate wastewater discharge,photoelectrochemical(PEC)online sensors were developed,with advantages such as low energy consumption,inherent miniaturization,simple instrumentation,and fast response.However,there is no publicly available systematic review of the recent advances in PEC ion sensors available in the literature since January 2017.Thus,this review covers the various strategies that have been used to enhance the sensitivity,selectivity,and limit of detection for PEC ion sensors.The photoelectrochemically active materials,conductive substrates,electronic transfer,and performance of various PEC sensors are discussed in detail and divided into sections based on the measurement principle and detected ion species.We conclude this review by highlighting the challenges and potential future avenues of research associated with the development of novel high-performance PEC sensors.

关键词： Photoelectrochemical sensor Ion detection working principle Electronic transfer Sensitivity and selectivity Limit of detection

A New Kind of Pilot Controlled Proportional Direction Valve with Internal Flow Feedback

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Chinese Journal of Mechanical Engineering 2010年第1期23卷 60-65页

作者： QUAN Long XU Xiaoqing YAN Zheng ZHANG Xiaojun Institute of Mechatronics Engineering Taiyuan University of Technology Taiyuan 030024 China

Proportional direction valve is one of the most fundamental elements in electronic-hydraulic control technique. Its function is to control the operating speed, direction, position, and strength of output force of the hydraulic actuator continuously. Considering the different application and the cost, the existing technique mainly includes the internal feedback valve used in open loop system, and the electronic closed loop controlled valve used in closed loop system. Because of their different mechanical structure and the gre at different in performance, it brings inconvenience for customer to select, also inconvenience for enterprise to produce. Aiming at this problem, the idea of combining the above two kinds of valves into one body is proposed first, and then the new valve＇s structure to realize this target is designed. The idea intends to apply the displacement pilot flow feedback control principle in present 2-position 2-way valve system to the proportional direction valve of 3-position 4-way system. Newly designed feed forward controller can decouple the interference between the internal feedback and the electronic closed loop. Redundant conversion is designed to electronic switch mode. Experiment on dynamic and static characteristic of new proportional direction valve in internal feedback control mode and electronic closed loop control mode is discussed to prove the new theory is correct. Although the new valve is of excellent dynamic response characteristic, its steady control characteristic in open loop control mode needs to be improved further. The research results prepare one new fundamental element for electronic-hydraulic control technology.

关键词： pilot flow feedback proportional direction valve working principle characteristic research

Moderate Resolution Imaging Camera (MoRIC) of China’s First Mars Mission Tianwen-1

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Earth and Planetary Physics 2020年第4期4卷 364-370页

作者： GuoBin Yu EnHai Liu GuangLin Liu Li Zhou JunZhe Zeng YuanPei Chen XiangDong Zhou RuJin Zhao ShunYi Zhu Key Laboratory of Science and Technology on Space Optoelectronic Precision Measurement Chinese Academy of SciencesChengdu 610209China The Institute of Optics and Electronics the Chinese Academy of SciencesChengdu 610209China

China's first Mars exploration mission will carry out comprehensive global surveys of the planet from data collected by instruments carried in orbit and roving on the planet itself.Goals of the mission include detailed inspections and surveys of key areas on the surface of Mars.One of the main scientific payloads installed on the orbiter is the moderate resolution camera.Its mission is to image the surface of Mars sufficiently to produce a global remote sensing image map of the planet,and to explore and record changes to the topography of Mars,including major geological structures,and to advance research on topography and geomorphology in general.The moderate resolution camera uses a lightweight and compact integrated design;its primary components are an optical module,a focal plane module,a camera control module,a power and interface module,a camera support module,a thermal control module,and a reference module.Radiometric calibration,color calibration,and geometric calibration have been carried out to ensure that the camera can acquire sufficient accurate data to complete mission goals.This paper introduces the camera's detection mission,its system composition,and its working principle;it also describes the camera's ground calibration tests and their results,and provides a reference for processing the camera's scientific data and for future applications.

关键词： Mars exploration moderate resolution camera system composition working principle calibration test

Performance analysis of a 2-stroke micro free-piston swing engine

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Petroleum Science 2009年第3期6卷 313-318页

作者： Zhang Shimin Guo Zhiping Wang Jinsong School of Mechanical and Electronic Engineering China University of Petroleum Beijing 102249 China College of Mechanical Engineering Inner Mongolia University of Technology Hohhot Inner Mongolia 010051 China Department of Precision Instrument and Mechanology Tsinghua University Beijing 100084 China

The micro free-piston swing engine （MFPSE） is a new structure, free-piston internal combustion engine. The dynamic model integrated MFPSE with a power generator and thermodynamic models in compression, power and scavenge processes based on the open thermodynamic systems were presented. A simulation was executed at given geometric parameters and initial conditions. The results manifest that the working principle of MFPSE is feasible.

关键词： Micro free-piston swing engine working principle performance simulation

A high-precision borehole gravimeter

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Geodesy and Geodynamics 2011年第3期2卷 76-79页

作者： Li Jiaming Yao Zhigui Wen Xingwei Gong Ping Wei Jin Institute of Seismology China Earthquake Administration Wuhan 430071 China Crustal Movement Laboratory Wuhan 430071 China

The paper describes the working principle and structure of a newly designed high-precision （ inicrogal） gravimeter, which is basically a vertically suspending spring-weight system, using a highly sensitive capacitance sensor of movement in a controlled temperature environment in a borehole and a multi-frequency output for both earth-tide and earthquake monitoring. The preliminary test indicated that, while in a stabilization process, it had met all the technical requirements for a relative gravimeter used for earth tide and earthquake monitoring.

关键词： borehole gravimeter working principle structure broad band

Design and Prototype Test of 9FQM1000 Branch and Straw Hammer Mill

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Asian Agricultural Research 2020年第5期12卷 50-53页

作者： Xiangquan CUI Hansong LI Feng ZHAO Zongchao ZHANG Dayong GUO Bin WANG Shandong Academy of Agricultural Machinery Sciences Jinan 250100 China

[Objectives]To better design and test 9FQM1000 branch and straw hammer mill in view of the problems of large output,low utilization rate,traditional incineration and easily polluting environment of the new agricultural economic organization's straw and waste branches.[Methods]This hammer mill adopts dual-channel feeding method.It adopts the basic working principle of disc shredding and hammer crushing.Besides,it makes design of the structure and driving system of the branch and straw hammer mill.9FQM1000 type branch and straw hammer mill can finely crush the branches and straws.Finally,it makes a trial production of 9FQM1000 type branch and straw hammer mill.[Results]The prototype test showed that the combined crushing structure of 9FQM1000 type branch and straw hammer mill is reliable,and the production capacity is 3000 kg/h.[Conclusions]The automatic feeder makes the crushing operation more stable,the labor intensity is reduced,the structure is simple,and it can be moved by traction.It is environmentally friendly and pollution-free.It has the characteristics of high safety,automation and high production efficiency.Also,crushed materials can be used as edible fungus culture medium,animal feed,organic fertilizer,etc.,and can be further compressed into biomass fuel,and the crushed branches can also be returned to the field.

关键词： Branch and straw hammer mill Disc shredding Hammer crushing working principle Driving scheme

Structure Design of the Mobile Cutting Machine Tool Based on Pro / Engineer

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International Journal of Plant Engineering and Management 2014年第4期19卷 246-250页

作者： CAI Chang-liang TANG Shu-feng QIU Hong-ran School of Mechanical Engineering Inner Mongolia University of Technology Inner Mongolia Electric Power Research Institute

In order to solve the existing problems of current metal cutting equipment,combined with the development situation of metal cutting industry in China,on this basis,a design can realize multi-shaped metal cutting machine tool. Introduces the working principle of the machine tool,the structure and parameters of the main component,and the establishment of the model by using the 3D modeling software Pro / Engineer（ Pro / E）;through listing the advantages of the mobile machine,shown that the metal machine tool has the structural characteristics of mobile,semi automated,can improve the cutting precision,increase cutting efficiency,and the utility market has certain value. It has guiding significance for the further study and the potential applications of the mobile cutting machine tool.

关键词： metal cutting industry mobile cutting machine tool working principle Pro / E

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浅谈氧传感器

浅谈氧传感器