DIMENSIONAL DESIGN THEORY AND METHODOLOGY OF 6-DOF SCISSOR PARALLEL MANIPULATOR

Parallel manipulators have many advantages over serial manipulators in termsof high load/weight ratio, velocity, stiffness and precision. A dimensional design theory andmethodology of six degrees of freedom scissor parallel manipulator (SPM) is investigated. The SPMkinematics inverse equation is given. Based on the formulation of the local dexterity and thedefinition about the indexes of workspace incircle radius, the effects of the design parameters onthe dexterity and workspace are discussed. Moreover the incircle radius change ratio about workspaceare defined and used as the evaluated indicator to analyze the effects of the design parameters onthe performances. A dimensional design theory that could satisfy the requirement of dexterity andworkspace is proposed. The dimensional design theory and methodology can be of help in the design,trajectory planning and control of parallel manipulator.

Three-dimensional global interconnect based on a design window

Based on a stochastic wire length distributed model, the interconnect distribution of a three-dimensional integrated circuit （3D IC） is predicted exactly. Using the results of this model, a global interconnect design window for a giga-scale system-on-chip （SOC） is established by evaluating the constraints of 1） wiring resource, 2） wiring bandwidth, and 3） wiring noise. In comparison to a two-dimensional integrated circuit （2D IC） in a 130-nm and 45-nm technology node, the design window expands for a 3D IC to improve the design reliability and system performance, further supporting 3D IC application in future integrated circuit design.

Modified shape-based method for three-dimensional trajectory design

Although the shape-based method has been proven to be useful for low-thrust trajectory design,and be capable to provide near-optimal solution for a more accurate trajectory optimization method,it is slightly non-effective when used in some 3D cases.In this paper,a modified 3D shape-based method is proposed for earth trajectory design.In this approach,in consideration of the sinusoidal periodic variation in z direction of actual trajectory,a new exponential sinusoid model is chosen for the out-of-plane motion,with four coefficients such that four scalar out-of-plane boundary conditions can be satisfied.After deriving the 3D shape-based procedure,low-thrust trajectory design example with modest inclination change is given.The results demonstrate that this modified approach is feasible for the transfer trajectory design,and comparing to the former shape-based method,the z direction solution is more coincident with the actual situation,furthermore,the solution may be used for further mission planning,trajectory evaluation and optimization.

Structural Design and Optimization of Comb-type Electric Bicycle Three-dimensional Parking Garage

With the reduction of urban land, the three-dimensional garage is increasingly built with its advantages of saving land. But the current three-dimensional garage is built for the car. It is hardly stereo parking garage for electric bicycles. This paper designed a hollow tower electric bicycle stereo parking garage with fork comb structure, based on the analysis of the characteristics of electric bicycles and the characteristics of existing three-dimensional garages. A fixed comb is mounted on the garage frame. The movable comb is mounted on the middle lift mechanism of the garage. The access of the vehicle is achieved by the exchange of the comb. The key comb structure was modeled using SolidWorks software and the stress distribution of the structure was analyzed. It was optimized by MATLAB software. The result shows that this structure can improve access efficiency. The quality of the comb structure can be minimized under the constraints of strength requirements.

Set up the Mechanical Curriculum System Based on Three-Dimensional Design

The changes of design methods and manufacturing techniques have brought new requirements for engineers in enterprises, and therefore brought a challenge to the traditional teaching system of mechanical major courses. A new teaching system based on three-dimensional design to cultivate modern engineers with solid specialty bases and high creativity in a wide range of fields is presented.

新型查尔酮衍生物抗乳腺癌活性的3D-QSAR模型构建及分子设计

为了获得较高抗乳腺癌活性的新型化合物,对18个新型查尔酮衍生物抗乳腺癌活性(pIC_(50))进行了三维定量构效关系(3D-QSAR)研究。其中14个化合物作为训练集用于构建3D-QSAR模型,其余化合物(含模板分子)作为测试集对所建模型进行验证。所建3D-QSAR模型的交叉验证系数R^(2)_(CV)为0.569,非交叉验证系数R^(2)为0.974,说明所建模型具有良好的稳定性和预测能力。该模型中立体场、静电场对pIC_(50)的贡献分别为58.8%和41.2%,表明影响该类化合物抗肿瘤活性的主要因素是取代基的疏水性、空间位阻和电荷分布。通过对模型的分析,设计了5个具有较高pIC_(50)的新化合物,有待通过后续医学实验加以验证。

控制、设计、统筹、中介--基于社会网络的《工程做法》大木作要素研究

清工部《工程做法》作为清代官式建筑范式源本,是解读木大作设计原法的根本。但由于传统分析方法难以理清其记载的各构件尺寸之间的庞杂关系,故本文首次利用社会网络分析方法,确定其卷一大木范式的节点与关系并以此构建出大木作尺寸关系网络,科学量化分析网络整体特征,以中心度指标分析各尺寸于关系网络中的联系与作用,探究出籍本暗含的尺寸灵活特性,总结并阐释其中具备控制、设计、统筹、中介属性的四类要素,并提出清代官式建筑大木作尺寸“变化”及尺寸间“权衡”的思考。以期挖掘清代官式建筑大木作设计原法,科学修正长期以来程式化与标准化的清代官式建筑认知,并为同类古代文献的进一步研究提供创新思路,为中国文化基因的传承表达贡献力量。

MATLAB App Designer在法布里-珀罗干涉实验中的应用

基于法布里-珀罗(F-P)多光束干涉原理,利用MATLAB设计了基于F-P干涉实验的可视化App仿真界面,不仅可复现F-P腔长、入射波长、透镜焦距等参数对F-P干涉图样的影响及实时动态展示,还可观察周围介质折射率、F-P腔折射率与干涉图样的关系,并能进行多波长分辨率和微小波长差测量实验的演示.这些直观形象的模拟结果展示,将有助于改善多光束干涉理论及实验教学效果.

DIMENSION VARIATION OF FEATURE-BASED MODEL BY OPERATING DIRECTLY ON B-REP

ＤＩＭＥＮＳＩＯＮＶＡＲＩＡＴＩＯＮＯＦＦＥＡＴＵＲＥ┐ＢＡＳＥＤＭＯＤＥＬＢＹＯＰＥＲＡＴＩＮＧＤＩＲＥＣＴＬＹＯＮＢ┐ＲＥＰＨＥＸｉａｏｚｈａｏ（何小朝），ＷＡＮＧＺｏｎｇｙａｎ（王宗彦）ＰＥＮＧＷｅｉ（彭维），ＺＨＡＮＧＴｉｅｃｈａｎｇ（张铁昌...

Optimal Design for Main Dimensions of a 75000t Floating Production and Storage Vessel

The basis, process and results of the demonstration of the main dimensions of a 75000t floating production and storage vessel are discussed in this paper. A simple but reliable orthogonal design method is applied in the main dimension optimization. The ideas of gradual approximation and feedback from various aspects are put into effect. During the demonstration, in order to make the model tally with the actual situation, the draft design is closely related to the computational analysis, so that the demonstration model can be verified at any time; the handling of the overall system is closely related to the research of each item, which is beneficial not only to the mastery of various regularities, but also to the balance of decisions. Finally, according to the computational results and the regularities obtained from analysis, the main dimensions are determined.

Expression of Time Dimension in Landscape Design

"Landscape is an expression symbol with the time dimension influenced by historical process. Time not only influences landscape project and changing process of regional materials all the time, but also shapes forms and cultural connotations of landscape. Proceeding from basic concepts of time dimension in landscape design, influence and significance of time in landscape design were explored from the perspectives of presentation (material changes), perception (spatial experience) and culture (historical process) of time dimension.

基于多维立体化设计的城市高密度空间优化策略--以东莞国际商务区首开区为例

阐述城市立体化设计作为解决高强度开发与空间资源不足之间矛盾的重要途径,在实现城市空间为人服务方面的理论与实践。以东莞国际商务区首开区为例,具体说明在有限用地内,如何以立体分层、空间腾挪、单元统筹等策略,营造地面、地下、空中多层次的城市基面系统,优化城市公共空间形态,弥补高密度功能复合带来的城市公共空间与生态活力缺失等问题。

Multiple Dimensions Convey Design and Application in CIS based on CG Technique

In the art design field, CG technique has been applied in many aspects like third dimension graphical display, human-computer interaction, virtual reality, three-dimensional cartoon and so on. In the meanwhile, the applications reflected in art design was appeared in computer assisted convey design, bothway or multi-ways interactive convey design and multimedia convey design. Computer assisted convey design included the application of the most CG technique in visual. Interactive convey design reflected interaction, which was the most obvious character of CG. However, multimedia convey design was used not only in CG technique, but also in digital media techniaue.

Three-Dimensional Velocity Distribution Measurement Using Ultrasonic Velocity Profiler with Developed Transducer

This study describes an ultrasonic velocity profiler that uses a new ultrasonic array transducer with unique 5-element configuration, with all five elements acting as transmitters and four elements as receivers. The receivers are designed to reduce the amount of uncertainty. As the fluid moves through this setup, four Doppler frequencies are obtained. The multi-dimensional velocity information along the measurement line can be reconstructed. The transducer has a compact geometry suitable for a wide range of applications, including narrow flow areas. The transducer’s basic frequency and sound pressure are selected and evaluated to be compatible with the application. First, to confirm the measurement ability, the measurement of the developed system in two-dimensional flow is validated by comparing it to the theoretical data. The uncertainty of measurement was within 15%. Second, the three-dimensional measurement in turbulent and swirling flow is proved experimentally to check the applicability of the proposed technique.

博物馆文创产品设计的“内环-外循”框架研究

目的 以国内九大博物馆文创店铺为分析对象,借助文创产品设计的内部隐性因素及外部显性特征,构建特征元素的纵横向坐标,建立文创产品的“内环-外循”研究框架,利用全新视角对博物馆文创产品概况进行全面剖析,理清文创产品在设计过程中的潜在优势与发展方向。依据研究数据推理出具有针对性的建议及发展预测,为凸显博物馆特色及历史文化为基底的文创产品提供完整的设计参照。方法 在数据采集上,利用手动及信息化爬虫2种方式并轨进行。首先,针对国内博物馆文创产品消费数据进行周期为1年的手动数据跟踪,确定国内销售较好并具有特色的九大博物馆。然后,利用Bazhuayu数据采集工具追踪博物馆文创店铺的消费信息,对博物馆文创店铺销售案例进行内容统计、归类编码、数据剖析等操作,从而归纳并推理出文创产品的设计模式和潜在发展空间。结论 博物馆的文化因素承载着历史价值、人文设计和情感故事等信息,通过聚焦综合性文创产品体验,可以引导消费者的文化认知、审美情趣和消费心理等趋势。通过对博物馆文创产品设计现状的深度挖掘,为新时代背景下博物馆文创产业在优化附加值和增强生命力等领域提供多维度视角参考。

Advanced Anode Materials of Potassium Ion Batteries:from Zero Dimension to Three Dimensions

Potassium ion batteries(PIBs)with the prominent advantages of sufficient reserves and economical cost are attractive candidates of new rechargeable batteries for large-grid electrochemical energy storage systems(EESs).However,there are still some obstacles like large size of K+to commercial PIBs applications.Therefore,rational structural design based on appropriate materials is essential to obtain practical PIBs anode with K+accommodated and fast diffused.Nanostructural design has been considered as one of the effective strategies to solve these issues owing to unique physicochemical properties.Accordingly,quite a few recent anode materials with different dimensions in PIBs have been reported,mainly involving in carbon materials,metal-based chalcogenides(MCs),metal-based oxides(MOs),and alloying materials.Among these anodes,nanostructural carbon materials with shorter ionic transfer path are beneficial for decreasing the resistances of transportation.Besides,MCs,MOs,and alloying materials with nanostructures can effectively alleviate their stress changes.Herein,these materials are classified into 0D,1D,2D,and 3D.Particularly,the relationship between different dimensional structures and the corresponding electrochemical performances has been outlined.Meanwhile,some strategies are proposed to deal with the current disadvantages.Hope that the readers are enlightened from this review to carry out further experiments better.

Comprehensive evaluation of high-steep slope stability and optimal high-steep slope design by 3D physical modeling

High-steep slope stability and its optimal excavation design in Shuichang open pit iron mine were analyzed based on a large 3D physical simulation technique. An optimal excavation scheme with a relatively steeper slope angle was successfully implemented at the northwest wall between Nos. 4 and 5 exploration lines of Shuichang Iron Mine, taking into account the 3D scale effect. The phys-ico-mechanical properties of rock materials were obtained by laboratory tests conducted on sample cores from exploration drilling directly from the iron mine. A porous rock-like composite material was formed for the model, and the mechanical parameters of the material were assessed experimentally;specifically, the effect of water on the sample was quantitatively determined. We adopted an experimental setup using stiff modular applied static loading to carry out a visual excavation of the slope at a random depth. The setup was equipped with acous-tic emission （AE） sensors, and the experiments were monitored by crack optical acquirement, ground penetrating radar, and close-field pho-togrammetry to investigate the mechanisms of rock-mass destabilization in the high-steep slope. For the complex study area, the model re-sults indicated a clear correlation between the model＇s destabilization resulting from slope excavation and the collected monitoring informa-tion. During the model simulation, the overall angle of the slope increased by 1-6 degrees in different sections. Dramatically, the modeled excavation scheme saved over 80 million tons of rock from extraction, generating enormous economic and ecological benefits.

ANN Based Predictive Modelling of Weld Shape and Dimensions in Laser Welding of Galvanized Steel in Butt Joint Configurations

The quality assessment and prediction becomes one of the most critical requirements for improving reliability, efficiency and safety of laser welding. Accurate and efficient model to perform non-destructive quality estimation is an essential part of this assessment. This paper presents a structured and comprehensive approach developed to design an effective artificial neural network based model for weld bead geometry prediction and control in laser welding of galvanized steel in butt joint configurations. The proposed approach examines laser welding parameters and conditions known to have an influence on geometric characteristics of the welds and builds a weld quality prediction model step by step. The modelling procedure begins by examining, through structured experimental investigations and exhaustive 3D modelling and simulation efforts, the direct and the interaction effects of laser welding parameters such as laser power, welding speed, fibre diameter and gap, on the weld bead geometry (i.e. depth of penetration and bead width). Using these results and various statistical tools, various neural network based prediction models are developed and evaluated. The results demonstrate that the proposed approach can effectively lead to a consistent model able to accurately and reliably provide an appropriate prediction of weld bead geometry under variable welding conditions.

Metal-organic framework-derive d carbon-base d composites for electromagnetic wave absorption:Dimension design and morphology regulation

Developing highly efficient microwave absorbing materials(MAMs)to ameliorate the electromagnetic(EM)response and facilitate energy absorption is crucial in both the civil and military industries.Metal-organic framework(MOF)derived nanoporous carbon composites have emerged as advanced MAMs ow-ing to their rich porosity,tunable compositions,facile functionalization,and morphology diversity.To-gether with the flourishing development of composition-tuning strategy,the rational dimension design and elaborate control over the architectures have also evolved into an effective approach to regulating their EM properties.Herein,we provide a comprehensive review of the recent advances in using di-mension and morphology modulation to adjust the microwave attenuation capacities for MOF-derived carbon composites.The underlying design rules and unique advantages for the MAMs of various dimen-sions were discussed with the selection of representative work,providing general concepts and insight on how to efficiently tune the morphologies.Accordingly,the fundamental dimension-morphology-function relationship was also elucidated.Finally,the challenges and perspectives of dimension design and mor-phology control over MOF-derived MAMs were also presented.