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基于Design-Expert的电链锯锯齿结构参数优化
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作者 刘九庆 张天翼 +1 位作者 金攀 朱斌海 《森林工程》 北大核心 2024年第2期142-150,共9页
为提高电链锯的锯切效率,对电链锯锯齿的齿形结构参数进行研究,以单位锯切功为电链锯锯切效率的衡量指标,通过对电链锯锯切过程的仿真研究,得出不同结构锯齿的单位锯切功。以电链锯锯齿中的外形前角、侧刃楔角和顶刃楔角等结构参数作为... 为提高电链锯的锯切效率,对电链锯锯齿的齿形结构参数进行研究,以单位锯切功为电链锯锯切效率的衡量指标,通过对电链锯锯切过程的仿真研究,得出不同结构锯齿的单位锯切功。以电链锯锯齿中的外形前角、侧刃楔角和顶刃楔角等结构参数作为影响因子,采用Box-Benhnken中心组合试验方法设计多因素正交试验,使用Design-expert软件进行数据分析得出最优齿形结构参数组合。研究结果表明,所选取的齿形结构参数对单位锯切功影响程度由大到小顺序依次为外形前角、侧刃楔角、顶刃楔角,并获得最优齿形结构参数组合,外形前角为10.92°、侧刃楔角为45.7°、顶刃楔角为45.41°。 展开更多
关键词 电链锯 锯切效率 齿形结构参数 design-expert 单位锯切功
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SIMULATION IN THERMAL DESIGN FOR ELECTRONIC CONTROL UNIT OF ELECTRONIC UNIT PUMP 被引量:1
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作者 XU Quankui ZHU Keqing ZHUO Bin MAO Xiaojian WANG Junxi 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2008年第5期1-7,共7页
The high working junction temperature of power component is the most common reason of its failure. So the thermal design is of vital importance in electronic control unit (ECU) design. By means of circuit simulation... The high working junction temperature of power component is the most common reason of its failure. So the thermal design is of vital importance in electronic control unit (ECU) design. By means of circuit simulation, the thermal design of ECU for electronic unit pump (EUP) fuel system is applied. The power dissipation model of each power component in the ECU is created and simulated. According to the analyses of simulation results, the factors which affect the power dissipation of components are analyzed. Then the ways for reducing the power dissipation of power components are carried out. The power dissipation of power components at different engine state is calculated and analyzed. The maximal power dissipation of each power component in all possible engine state is also carried out based on these simulations. A cooling system is designed based on these studies. The tests show that the maximum total power dissipation of ECU drops from 43.2 W to 33.84 W after these simulations and optimizations. These applications of simulations in thermal design of ECU can greatly increase the quality of the design, save the design cost and shorten design time 展开更多
关键词 Diesel engine Electronic unit pump Electronic control unit Circuit simulation Thermal design
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Research on an Intelligent Decision Support System for a Conceptual Innovation Design of Pumping Units Based on TRIZ 被引量:1
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作者 Zhang Peng He Chuan Guan Hongxiang Gai Feng Qi Bin 《Petroleum Science》 SCIE CAS CSCD 2006年第1期85-91,共7页
Attention is concentrated on how to perform the innovative design during the process of pumping unit conceptual design, and how to enhance design efficiency and inspire creativity. Aiming at the shortages of conceptua... Attention is concentrated on how to perform the innovative design during the process of pumping unit conceptual design, and how to enhance design efficiency and inspire creativity. Aiming at the shortages of conceptual design, introducing the theory of inventive problem solving (TRIZ) into the mechanical product design for producing innovative ideas, and using the advanced computer-aided technique, the intelligent decision support system (IDSS) based on TRIZ (TRIZ-IDSS) has been constructed. The construction method, system structure, conceptual production, decisionmaking and evaluation of the problem solving subsystem are discussed. The innovative conceptual design of pumping units indicates that the system can help the engineers open up a new space of thinking, overcome the thinking inertia, and put forward innovative design concepts. This system also can offer the scientific instructions for the innovative design of mechanical products. 展开更多
关键词 Pumping units innovative conceptual design TRIZ intelligent decision support system
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Design of Distorted Wave Protection Armor Units
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作者 Lou Hongen Senior Engineer, Nanjing Hydraulic Research Institute, 210029, Nanjing 《China Ocean Engineering》 SCIE EI 1992年第4期445-454,共10页
In consideration of the global optimization for engineering projects, a group of calculation formulas have been derived by means of theoretical derivation and model tests. On this basis, a design procedure for the dis... In consideration of the global optimization for engineering projects, a group of calculation formulas have been derived by means of theoretical derivation and model tests. On this basis, a design procedure for the distorted units is proposed, by means of which the distorted units of an anology shape and an identical porosity ratio with the original units can be obtained after conducting a distorted enlargement and a normal contraction. The stability waveheight and stability factor of the distorted unit can be calculated with the enlargement factor, a, of the horizontal dimension of the distorted unit, or with the contraction scale, A , of the contracted distorted unit. As a result, the stability of the armor unit can be significantly improved without increasing the quantity of concrete. For the same wave met by the original units, the thickness of placement of the contracted distorted unit can be obviously reduced, thus, a large quantity of concrete can be saved, consequently, economic benefit can be achieved. 展开更多
关键词 armor unit breakwater design STRUCTURE wave protection
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Optimum Structural Design of a Chain-Driving Pumping Unit
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作者 Zhang Ailin and Liu Yang(Doctors,Qinhuangdao Branch of Daqing Petroleum Institute) 《China Oil & Gas》 CAS 1994年第4期45-47,共3页
In this paper the pumping unit of type QLCJ14-6 is studied.Through the belt driving unit,the mo-tor drives the driving sprocket in which the rotation rate has been reduced by the reduction ge arbox.The locus chain mov... In this paper the pumping unit of type QLCJ14-6 is studied.Through the belt driving unit,the mo-tor drives the driving sprocket in which the rotation rate has been reduced by the reduction ge arbox.The locus chain moves between the driving sprocket and upper sprocket which are vertically set.There's a special chain element in the locus chain,which drives the reciprocating holster with the main shaft linchpin and slide block.The r reciprocating g holster could only move up and down when the locus chain moves in a circle.In this way the up and down stroke of the sucker rod and the mac hine is realized.The lower end of the reciprocating holster is con-nected with the equilibrium system to make the structure balance.The balancing cylinder is re-placed by the balancing block to make the structure simplified. 展开更多
关键词 CHAIN DRIVE PUMPING unit STRUCTURAL design Optimization
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The Design and Implementation of the Data Buffer Unit in an Artificial intelligence Computer ITM-1
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作者 张晨曦 《High Technology Letters》 EI CAS 1996年第2期55-58,共4页
This paper describes the function,structure and working status of the data buffer unitDBU,one of the most important functional units on ITM-1.It also discusses DBU’s supportto the multiprocessor system and Prolog lan... This paper describes the function,structure and working status of the data buffer unitDBU,one of the most important functional units on ITM-1.It also discusses DBU’s supportto the multiprocessor system and Prolog language. 展开更多
关键词 DBU The design and Implementation of the Data Buffer unit in an Artificial intelligence Computer ITM-1 Prolog CPU ITM
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Characteristics and experience in the electrical design of the first domestically-integrated large-scale air separation unit
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作者 GONG Zhaoliang 《Baosteel Technical Research》 CAS 2009年第3期18-22,共5页
The first domestically-integrated large-scale air separation unit (ASU) with a capacity of 60 000 m^3/h was successfully built and put into operation at Baosteel. Compared with the electrical design of the imported ... The first domestically-integrated large-scale air separation unit (ASU) with a capacity of 60 000 m^3/h was successfully built and put into operation at Baosteel. Compared with the electrical design of the imported equipment of the same type,this ASU has an electrical protection interlink that is independent from the distribution control system (DCS). With the design idea of simplicity, the ASU features a simplified configuration and an audio alarm system for electrical failures. It helps reduce the failure rate of the electrical equipment and detect failures quickly and accurately. It will effectively enhance safe and stabilized production. The ASU can not only reduce the cost of investment, but also ensure a smooth and stable running of the whole electrical equipment. This study focuses on the experience and understanding of the unit design and commissioning. 展开更多
关键词 air separation unit LOCALIZATION electrical design characteristics
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JUnit框架剖析 被引量:9
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作者 戴建国 郭理 曹传东 《计算机与数字工程》 2008年第8期43-45,135,共4页
JUnit是java语言的开放源码的单元测试框架,设计非常精巧。分析它的包结构、主要类的关系和作用以及框架中涉及到的设计模式,并通过一个实例展示其扩展功能。
关键词 Junit 单元测试 设计模式
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单元测试工具JUnit框架浅析 被引量:2
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作者 王焱 吴青林 《郧阳师范高等专科学校学报》 2010年第6期57-59,共3页
JUnit是非常经典的单元测试框架,值得Java爱好者认真学习和研究.通过对JUnit文件结构、设计模式及扩展进行分析,以便更好的运用JUnit进行软件测试.
关键词 unit 框架 单元测试 设计模式
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基于DbUnit的单元测试框架设计 被引量:1
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作者 李英杰 宋晓静 《煤炭技术》 CAS 北大核心 2011年第6期178-179,共2页
DbUnit是一款开源的数据库功能测试框架,使用它可以对数据库的基本操作进行白盒单元测试,对输入输出进行校验,从而保证数据的有效性。DbUnit使用XML文件提供测试数据,为测试人员增加了测试难度,降低了单元测试效率。文章针对此种情况,... DbUnit是一款开源的数据库功能测试框架,使用它可以对数据库的基本操作进行白盒单元测试,对输入输出进行校验,从而保证数据的有效性。DbUnit使用XML文件提供测试数据,为测试人员增加了测试难度,降低了单元测试效率。文章针对此种情况,介绍了如何基于DbUnit设计一个数据库单元测试框架,使用Excel文件提供测试数据,从而提高数据库单元测试的工作效率。 展开更多
关键词 数据库单元测试 Dbunit 测试操作界面设计 测试框架数据库设计
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Performance Evaluation and Design of RO Desalination Plant: Case Study
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作者 Mona A. Abdel-Fatah Ayman El-Gendi Fatma Ashour 《Journal of Geoscience and Environment Protection》 2016年第2期53-63,共11页
The aim of this paper is to design a water desalination plant using Reverse Osmosis membrane to treat salt water to be usable for drinkable, domestic, industrial or agricultural uses. RO unit is designed to conservati... The aim of this paper is to design a water desalination plant using Reverse Osmosis membrane to treat salt water to be usable for drinkable, domestic, industrial or agricultural uses. RO unit is designed to conservative standards for versatility in the event of feed water quality variations. The design includes a feed water flush cycle to minimize membrane fouling and piping corrosion during shutdown. The system will be all appropriate controls and instrumentation for automatic operation. All system components are available and of heavy duty industrial design and fabricated with the highest quality workmanship. Quality control will be maintained throughout all manufacturing processes. The system will produce permeate water minimum of 3600 m<sup>3</sup>/day with a quality of approximately 100 ppm total dissolved solids (TDS) when operating on well feed water with a 10,000 ppm TDS and a temperature of 25 - 30 degrees C. The design permeate recovery is 50%;and energy recovery device which saves $30,556.28/year. 展开更多
关键词 DESALINATION Brackish Water RO design unit Energy Recovery Systems
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V6 Pro/design在级进模设计中的应用
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作者 窦智 张光宇 《模具制造》 2005年第4期13-14,共2页
介绍了V6Pro/design的展开、排样、模具系统、特征孔系统、轮廓特征单元设计、拆图与细部设计等各部分功能,指出了V6Pro/design的优点与不足。
关键词 design PRO 级进模 应用 单元设计 轮廓特征 细部设计 系统
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TECHNOLOGY AND APPLICATION OF PRODUCT EVOLUTIONARY DESIGN BASED ON CONFIGURATION IN MASS CUSTOMIZATION MODE 被引量:3
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作者 FENG Yixiong CHENG Jin +2 位作者 TAN Jianrong ZHENG Bing WEI Zhe 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2007年第3期113-119,共7页
Product customization has been recognized as an effective means to implement mass cus-tomization (MC). A new theory and method for MC-oriented evolutionary design of configuration product is presented based on the s... Product customization has been recognized as an effective means to implement mass cus-tomization (MC). A new theory and method for MC-oriented evolutionary design of configuration product is presented based on the study of developing law of evolutionary design in integrated envi-ronment, which focuses on the innovation and reuse properties of configuration product. The key technologies for general requirement modeling in quick response to customer requirement, multi-level stepwise configuration optimization driven by customer requirement and evolutionary deduction of product variable structure based on configuration association are thoroughly investigated. The suc-cessful application of the presented method in the development of real-life products demonstrates its utility, flexibility and robusticity. 展开更多
关键词 Mass customization Evolutionary design Configuration product Configuration unit
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Design of Prefabricated Old-age Building Based on Modularization:A Case Study of Institutional Elderly Houses Design in Taigou Village,Xi'an City 被引量:3
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作者 SUN Qianqian 《Journal of Landscape Research》 2018年第5期84-87,共4页
Old-age building was designed in Ziwu Town,from the aspects of energy saving,environmental protection,full use of solar energy and characteristics of the local climate.In order to meet the requirements of energy conse... Old-age building was designed in Ziwu Town,from the aspects of energy saving,environmental protection,full use of solar energy and characteristics of the local climate.In order to meet the requirements of energy conservation,environmental protection and climate adaptability of residential buildings,this paper integrates the construction and design in the prefabricated building design,at the same time,with the consideration of the possibility of expansion and removal of the nursing home,the concept of "modular unit" is put forward.Considering the climatic adaptability of the base position,the utilization of solar energy and the organization of natural ventilation should be paid attention to,also,the rammed soil construction method is added in this design,which can improve the thermal insulation performance of the building enclosure and create a comfortable indoor thermal environment both in winter and summer.In order to realize the object of industrial building construction and design,the prefabricated construction method is used,which produces impact on the surrounding environment more environmentally friendly.The building will be easily built,less restricted,and low-cost.What's more,local material and the advantages of all dry work increase the operability of the project. 展开更多
关键词 PREFABRICATED assembly OLD-AGE BUILDING design Modular units
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Design and Kinematics Study on Space Hyper-Redundant Robot
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作者 吴伟国 蔡鹤皋 +1 位作者 邓喜君 张涛 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 1996年第2期83-87,共5页
The design of space hyper-redundant robot with high dexterity is problem with great complexity. Taking the aim at robot product seriation and combination design, the combination design method of space hyper-redundant ... The design of space hyper-redundant robot with high dexterity is problem with great complexity. Taking the aim at robot product seriation and combination design, the combination design method of space hyper-redundant robot based on the omnidirectional unit arm of 3 degrees of freedom (d.o.f) is proposed in this paper. The kinematics model of this kind of robot is established through the equivalent mechanism model. On the basis of successful research on 3-d.o.f unit arm, the 7-d.o.f bionics arm redundant robot with double unit arm has been developed further.The content discussed in this paper is very important to the robot technology in future space station, nuclear industry andunderwater work on the sea floor. 展开更多
关键词 ss: Hyper-redundant robot COMBINATION design unit arm
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Design of a Novel Photobioreactor for Culture of Microalgae 被引量:1
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作者 Xia Jin-lan J M Levert +2 位作者 F Benjelloun P Glavie P Lhoir 《Wuhan University Journal of Natural Sciences》 CAS 2002年第4期486-492,共7页
This paper presents the design of a novel photobioreactor for cultivation of microalgae. The body of the reactor with volume of about 40 L is parallelipipedic and divided in five compartments that can be put in series... This paper presents the design of a novel photobioreactor for cultivation of microalgae. The body of the reactor with volume of about 40 L is parallelipipedic and divided in five compartments that can be put in series. The optical guides, plunged perpendicularly into the compartments, are upright Plexiglas plates on which side faces there are able to diffuse light laterally and ensure an even distribution of light in the medium. External airlifts through the side columns are used for mixing of culture medium. The external light source is a SON-T lamp mounted inside a projector that provides a conical light dispersion, it is interchangeable and may take different positions. The design offers the photobioreactor characteristics including mainly interchangeable light source, homogenous distribution of light, perfect mixing of suspension of algae, high ratio of illuminating surface to volume of reactor, compactness and absence of contamination. Schemes, view of the photobioractor and data of continuous culture forSpirulina maxima are presented. 展开更多
关键词 design PHOTOBIOREACTOR MICROALGAE Plexiglas optic unit Spirulina maxima
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Unit Cell Modelling of Auxetic Structure
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作者 Sydney Pothier Reem Roufail Margaret Malton 《Journal of Minerals and Materials Characterization and Engineering》 CAS 2022年第4期360-369,共10页
Auxetic material structures exhibit a negative Poisson ratio. The structure expands in the axial and transverse directions under tensile loading and vice versa under compression loading. Many fabricated designs for au... Auxetic material structures exhibit a negative Poisson ratio. The structure expands in the axial and transverse directions under tensile loading and vice versa under compression loading. Many fabricated designs for auxetic materials exist such as re-entrant hexagonal, chiral, and arrowhead geometries. This paper studies the unit cell of the re-entrant hexagonal geometry to understand how changing the internal angle and fillet radius of the structure affects the Poisson’s ratio. The material chosen for this study is acrylonitrile butadiene styrene (ABS) due to its availability and frequent use in additive manufacturing. The study was based on finite element analysis. It is observed that the direction of load applied to the unit cell affects the unit cell strain, Poisson’s ratio, and maximum load capacity before failure responses. It is noticed that the re-entrant cell starts by showing a standard non-auxetic behavior until it reaches a specific axial strain value. A quadratic correlation is identified between axial and transverse strain. Designing an auxetic structure starts with understanding the behavior of a unit cell structure. The auxetic structure design is a complex process that requires a compromise between auxetic property to be achieved and load capacity via avoiding stress concentration zones. 展开更多
关键词 Auxetic Material Negative Poisson’s Ratio Re-Entrant Hexagon Finite Element Analysis unit Cell design
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Joint device architecture algorithm codesign of the photonic neural processing unit
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作者 Li Pei Zeya Xi +4 位作者 Bing Bai Jianshuai Wang Jingjing Zheng Jing Li Tigang Ning 《Advanced Photonics Nexus》 2023年第3期132-138,共7页
The photonic neural processing unit(PNPU)demonstrates ultrahigh inference speed with low energy consumption,and it has become a promising hardware artificial intelligence(AI)accelerator.However,the nonidealities of th... The photonic neural processing unit(PNPU)demonstrates ultrahigh inference speed with low energy consumption,and it has become a promising hardware artificial intelligence(AI)accelerator.However,the nonidealities of the photonic device and the peripheral circuit make the practical application much more complex.Rather than optimizing the photonic device,the architecture,and the algorithm individually,a joint device-architecture-algorithm codesign method is proposed to improve the accuracy,efficiency and robustness of the PNPU.First,a full-flow simulator for the PNPU is developed from the back end simulator to the high-level training framework;Second,the full system architecture and the complete photonic chip design enable the simulator to closely model the real system;Third,the nonidealities of the photonic chip are evaluated for the PNPU design.The average test accuracy exceeds 98%,and the computing power exceeds 100TOPS. 展开更多
关键词 optics photonics Mach-Zehnder interferometer array photonic neural processing unit design
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Hermitian unital中的两个无限2-设计族
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作者 李荣荣 詹小秦 《湖北大学学报(自然科学版)》 CAS 2022年第4期496-500,共5页
本研究证明Hermitian unital中以3维特殊射影酉群PSU(3,q)作为旗传递自同构群的两个无限2-设计族的存在性,为旗传递2-设计的分类提供新的分类方法.
关键词 2-设计 Hermitian unital 自同构群 旗传递 PSU(3 q)
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基于减压降温原理的超流氦获取真空机组的研制
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作者 丁美莹 李娜 +6 位作者 叶斌 蔡毅杰 曹菁 杨榆 周冬冬 张玙 何昆 《低温工程》 CAS CSCD 北大核心 2024年第3期38-44,92,共8页
南方先进光源研究测试平台(SAPS-TP)为了给超导腔提供2 K测试环境,采用在氦池入口抽真空至饱和蒸气压的方式来获取2 K超流氦。研制一套减压降温真空机组用来抽取真空,详细介绍了设计和选型计算,并借鉴各大型2 K低温系统的使用经验,进行... 南方先进光源研究测试平台(SAPS-TP)为了给超导腔提供2 K测试环境,采用在氦池入口抽真空至饱和蒸气压的方式来获取2 K超流氦。研制一套减压降温真空机组用来抽取真空,详细介绍了设计和选型计算,并借鉴各大型2 K低温系统的使用经验,进行了优化。已完成20余次超导腔的性能测试,真空机组运行稳定,氦池压力、温度和液位等参数的控制精度达到设计指标。运行测试结果表明,所研制的减压降温真空机组性能满足设计要求。 展开更多
关键词 低温系统 2 K超流氦 选型设计 真空泵机组
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