检索结果-南通市图书馆

Posture control of a 3-RPS pneumatic parallel platform with parameter initialization and an adaptive robust method

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2017年第3期18卷 303-316页

作者： Guo-liang TAO ce shang De-yuan MENG Chao-chao ZHOU The State Key Laboratory of Fluid Power Transmission and Control Zhejiang University School of Mechatronic Engineering China University of Mining and Technology

A control algorithm for a 3-RPS parallel platform driven by pneumatic cylinders is discussed. All cylinders are controlled by proportional directional valves while the kinematic and dynamic properties of the system are modeled. The method of adaptive robust control is applied to the controller using a back-stepping approach and online parameter estimation. To compensate for the uncertainty and the influence caused by estimations, a fast dynamic compensator is integrated in the controller design. To prevent any influence caused by the load applied to the moving platform changing in a practical working situation, the identification of parameters is taken as the initialization of unknown parameters in the controller, which can improve the adaptability of the algorithm. Using these methods, the response rate of the parameter estimation and control performance were improved *** adverse effects of load and restriction forces were eliminated by the initialization and online *** under different situations illustrated the effectiveness of the adaptive robust controller with parameter initialization, approaching average tracking errors of less than 1%.

关键词： Parameter initialization Adaptive robust control Parallel mechanism Pneumatic cylinders

A review of the design methods of complex topology structures for 3D printing

在线全文

学校读者我要写书评

暂无评论

Visual Computing for Industry,Biomedicine,and Art 2018年第1期1卷 34-49页

作者： Jiawei Feng Jianzhong Fu Zhiwei Lin ce shang Bin Li State Key Laboratory of Fluid Power and Mechatronic Systems College of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province College of Mechanical EngineeringZhejiang UniversityHangzhou 310027China

As a matter of fact,most natural structures are complex topology structures with intricate holes or irregular surface *** structures can be used as lightweight infill,porous scaffold,energy absorber or *** the rapid advancement of 3D printing,the complex topology structures can now be efficiently and accurately fabricated by stacking layered *** novel manufacturing technology and application background put forward new demands and challenges to the current design methodologies of complex topology *** this paper,a brief review on the development of recent complex topology structure design methods was provided;meanwhile,the limitations of existing methods and future work are also discussed in the end.

关键词： Complex topology structure Computer-aided design 3D printing Optimization design

Review of heterogeneous material objects modeling in additive manufacturing

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Visual Computing for Industry,Biomedicine,and Art 2020年第1期3卷 53-70页

作者： Bin Li Jianzhong Fu Jiawei Feng ce shang Zhiwei Lin State Key Laboratory of Fluid Power and Mechatronic Systems College of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province College of Mechanical EngineeringZhejiang UniversityHangzhou 310027China

This review investigates the recent developments of heterogeneous objects modeling in additive manufacturing(AM),as well as general problems and widespread solutions to the modeling methods of heterogeneous *** heterogeneous object representations are generally categorized based on the different expression or data structure employed therein,and the state-of-the-art of process planning procedures for AM is reviewed via different vigorous solutions for part orientation,slicing methods,and path planning ***,some evident problems and possible future directions of investigation are discussed.

关键词： Review Heterogeneous objects modeling Heterogeneous materials Additive manufacturing

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

广域综合能源的一条规划路径

中国电机工程学报 2020年第13期40卷 4081-4091页

作者：尚策上海交通大学电气工程系上海市闵行区200240

广域的能源综合化对应于电力系统的输电网级,在能源供需灵活化、能源形态多样化、系统所有权多元化的挑战下,其延续的传统电力规划方法暴露出三大缺陷——规划依托的运行方式过于粗糙,规划建立的优化架构过于简单,规划对象的协同性不足... 详细信息

广域的能源综合化对应于电力系统的输电网级,在能源供需灵活化、能源形态多样化、系统所有权多元化的挑战下,其延续的传统电力规划方法暴露出三大缺陷——规划依托的运行方式过于粗糙,规划建立的优化架构过于简单,规划对象的协同性不足。该文从文献中提炼出这些缺陷的同时,探索出技术手段对其一一弥补——源网荷储同步调度嵌入规划,建立分布式自适应鲁棒的优化架构,协同多能源设备的自主决策。完整的技术手段也指引出整条广域综合能源规划的可行路径,指导综合能源在大范围内的产、运、储。

关键词：综合能源规划运行优化广域

Optical solitons supported by finite waveguide lattices with diffusive nonlocal nonlinearity

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第12期30卷 424-429页

作者： Changming Huang Hanying Deng Liangwei Dong ce shang Bo Zhao Qiangbo Suo Xiaofang Zhou Department of Electronic Information and Physics Changzhi UniversityChangzhi 046011China School of Photoelectric Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510665China Department of Physics Shaanxi University of Science&TechnologyXi’an 710021China King Abdullah University of Science and Technology(KAUST Physical Science and Engineering Division(PSEThuwal 23955-6900Saudi Arabia

We investigate the properties of fundamental,multi-peak,and multi-peaked twisted solitons in three types of finite waveguide lattices imprinted in photorefractive media with asymmetrical diffusion *** opposite soliton selfbending signals are considered for different families of *** thresholdless fundamental and multi-peaked solitons are stable in the low power *** existence domain of two-peaked twisted solitons can be changed by the soliton self-bending *** solitons tend to self-bend toward the waveguide lattice,stable two-peaked twisted solitons can be found in a larger region in the middle of their existence ***-peaked twisted solitons are stable in the lower(upper)cutoff region for a shallow(deep)lattice *** results provide an effective guidance for revealing the soliton characteristics supported by a finite waveguide lattice with diffusive nonlocal nonlinearity.

关键词： optical solitons diffusive nonlocal nonlinearity linear stability analysis

Properties,combustion behavior,and kinetic triplets of coke produced by low-temperature oxidation and pyrolysis:Implications for heavy oil in-situ combustion

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2021年第5期18卷 1483-1491页

作者： Shuai Zhao Wan-Fen Pu Lei Su ce shang Yang Song Wei Li Hui-Zhuo He Yi-Gang Liu Zhe-Zhi Liu State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduSichuan610500China Post-Doctorate R&D Base Southwest Petroleum UniversityChengduSichuan610500China E&D Research Institute of Liaohe Oilfield CNPC PanjinLiaoning124000China School of Oil and Gas Engineering Chongqing University of Science and TechnologyChongqing401331China

This work aimed at investigating the crucial factor in building and maintaining the combustion front during in-situ combustion(ISC),oxidized coke and pyrolyzed *** surface morphologies,elemental contents,and non-isothermal mass losses of the oxidized and pyrolyzed cokes were thoroughly *** results indicated that the oxidized coke could be combusted at a lower temperature compared to the pyrolyzed coke due primarily to their differences in the molecular polarity and *** triplets of coke combustion were determined using iso-conversional models and one advanced integral master plots *** activation energy values of the oxidized and pyrolyzed cokes varied in the range of 130-153 k J/mol and 95-120 kJ/mol,*** most appropriate reaction model of combustion of the oxidized and pyrolyzed cokes followed three-dimensional diffusion model(D_(3)) and random nucleation and subsequent growth model(F_(1)),*** observations assisted in building the numerical model of these two types of cokes to simulate the ISC process.

关键词： Oxidized coke Pyrolyzed coke Heavy oil In-situ combustion Kinetic triplets

在线全文

学校读者我要写书评

暂无评论

寿命约束的储能规划

中国电机工程学报 2020年第19期40卷 6150-6160页

作者：葛玉友尚策上海交通大学电气工程系电力传输与功率变换控制教育部重点实验室上海市闵行区200240

为防止规划结果过于乐观,建立寿命约束下的储能规划。储能寿命建立由放电深度决定,以等效全循环次数计算的数学模型。将储能选址定容与嵌入寿命模型的机组组合进行一体化优化求解。应对运行层面不确定性,模型建立为两阶段鲁棒优化模型... 详细信息

为防止规划结果过于乐观,建立寿命约束下的储能规划。储能寿命建立由放电深度决定,以等效全循环次数计算的数学模型。将储能选址定容与嵌入寿命模型的机组组合进行一体化优化求解。应对运行层面不确定性,模型建立为两阶段鲁棒优化模型。求解上,采用对偶理论结合列与约束生成分解算法,探讨其可行割与最优割的构建。解算方法应用于6节点系统,比较不考虑储能寿命与考虑储能寿命两种模式下系统的规划结果,并分析系统不确定性、储能单位成本等因素对储能规划的影响,及它们在固定规划方案中对储能寿命的影响。结果表明,受限于较高储能成本,以上因素较大影响储能规划策略,对储能循环寿命的影响较小。

关键词：储能寿命规划机组组合鲁棒优化

在线全文

学校读者我要写书评

暂无评论

中深层稠油蒸汽驱开发阶段动态特征

特种油气藏 2021年第5期28卷 107-112页

作者：尚策中国石油辽河油田分公司辽宁盘锦124010

针对中深层稠油蒸汽驱调控对策受开发阶段动态特征参数影响较大、难以明确划分蒸汽驱开发阶段等问题,以齐40块蒸汽驱为例,在分析蒸汽腔变化规律的基础上,综合利用动静态监测资料分析、油藏工程计算、数值模拟等多种手段,明确蒸汽驱不同... 详细信息

针对中深层稠油蒸汽驱调控对策受开发阶段动态特征参数影响较大、难以明确划分蒸汽驱开发阶段等问题,以齐40块蒸汽驱为例,在分析蒸汽腔变化规律的基础上,综合利用动静态监测资料分析、油藏工程计算、数值模拟等多种手段,明确蒸汽驱不同开发阶段的开采规律,筛选注入孔隙体积、可采储量采出程度、含水率及温度等动态参数作为蒸汽驱阶段划分的界限参数。研究结果表明:齐40块蒸汽驱蒸汽突破时注入孔隙体积与转驱前含油饱和度呈线性关系;注入孔隙体积倍数与可采储量采出程度呈截距为零的二阶函数关系。该研究成果在汽驱开发阶段划分过程中可操作性强,为不同类型蒸汽驱井组制订调控对策提供借鉴。

关键词：蒸汽驱开发阶段动态特征跟踪调控中深层稠油

减碳中多阶段的煤电机组退役与新能源、储能规划协同

在线全文

学校读者我要写书评

暂无评论

电力自动化设备 2021年第9期41卷 140-147页

作者：原一方尚策上海交通大学电气工程系上海200240

规划现役煤电机组的有序退役是电力系统低碳化转型中的关键问题:煤电机组退役会造成发电量缺额和系统灵活性不足的问题,尤其是在新能源占比逐渐增大的条件下,而储能是平衡电力供需、提升供电灵活性的有效技术途径。故应将电力系统规划... 详细信息

规划现役煤电机组的有序退役是电力系统低碳化转型中的关键问题:煤电机组退役会造成发电量缺额和系统灵活性不足的问题,尤其是在新能源占比逐渐增大的条件下,而储能是平衡电力供需、提升供电灵活性的有效技术途径。故应将电力系统规划与未来较长时间内煤电机组逐步退役一同考虑。为此,采用多阶段模型,在电力系统减碳背景下将煤电机组退役协同于新能源和储能规划。基于IEEE 39节点系统验证所提模型的有效性,从机组退役和电力系统减碳2个角度分析规划结果,结果表明通过合理规划新能源和储能能够辅助煤电机组退役的进程,从而实现电力系统低碳化转型。

关键词：煤电机组退役多阶段规划新能源储能灵活性约束