Reverse Solution and Parametric Design of the Conjugate Cam Weft Insertion Mechanism Based on VB.NET and UG

In order to realize the parametric design of the conjugate cam weft insertion mechanism,according to the necessary parameters of weft insertion process,ideal kinematic curves of the weft insertion mechanism were given,and the mathematical model of reverse solution for this mechanism was established.The parameters of this mechanism were obtained by reverse solution on the basis of the given ideal kinematic curves and kinematic requirements.The parametric design platform which was integrated with the functions of parametric reverse solution,motion simulation,three-dimensional modeling and virtual assembly was developed based on VB.NET and Unigraphics(UG) NX.After entering the technological parameters of weft insertion process and essential structural parameters by users,three-dimensional drawing of the main parts such as the conjugate cam and shaft,can be obtained by this platform,also the processing data of the cam can be calculated.This platform provides a rapid approach for parametric design of weft insertion mechanism.

Parametric Design Used in the Creation of 3D Models with Weaving Characteristics

The art of weaving is an ancient and beautiful technique that never fades. Various weaving techniques and various totem patterns contain rich cultural connotations. The development of cultural and creative industries often uses existing environmental materials to deconstruct and use them in innovative ways to reinspire and present another style. With the rapid progress of computer-aided design technology, digital applications in the design practice has become an important element, and parametric design is the best popular design method in recent years. This paper is mainly in view of the weaving crafts in the traditional culture of the world occupies an important role, and the precious traditional weaving crafts gradually lost. Therefore, it is planned to construct a 3D model with knitting characteristics through a parametric design method, and print out the prototype through the 3D printing mechanism, that is, the traditional craftsmanship is integrated into the modern manufacturing process with innovative techniques, to show the new style of this weaving craft culture that is different from the past, so that it not only retain its inherent spirit, but also can promote this ideal of cultural creativity.

Parametric Design Techniques Applied to Creative Hollow out Product Design with 3D Voronoi Patterns

The creation of hollow out art includes a variety of materials, techniques and categories, its content mostly emphasizes the ancient philosophy performance of the alternation of virtual and real, and Yin-Yang depends on the essence of Chinese culture deduction. If this feature is applied to product design, in addition to emphasizing functional orientation, this traditional arts integration with the new media, will give users a different visual inspire. This thesis is mainly in view of the importance of hollow out art in Chinese cultural heritage, and the 3D hollow out production craft has gradually lost. Therefore, the Delaunay triangle is constructed based on the Convex Hull interpolation algorithm, and the Voronoi Diagram feature is constructed based on the Divide and Conquer algorithm. And with Rhino modeling software as the main body, combined with the application of the parametric plug-in design program (GH), the 3D models of the parametric creative hollow pen holder and the parametric creative hollow lampshade were respectively completed. The traditional craftsmanship is integrated into the modern manufacturing process with innovative techniques, and the Chinese cultural spirit and beauty of nature are successfully connected.

Parametric Design:Measuring Learning States

Project teaching and learning comprises properties,strategies and procedures that currently involve computational thinking and logical reasoning.In general,this problem arises from the possibilities offered by the new software and the increase of the level of dominion of the project by the designer.In this context,this study aims to estimate how much the student profile contemporary of architecture is motivated and engaged in learning new project processes that use computational reasoning and logical reasoning,characteristic of parametric design.Methodologically,the research is based on the theory of flow,presents results of an investigation of engagement and learning of students of a school of Architecture and Urbanism in Brazil,referring to the themes and uses of parametric drawing.This study contributed to the practice and use of parametric design in the educational environment,besides allowing the integration of computational thinking in the creative process of the project.

Wooden Structures within the Context of Parametric Design: Pavilions and Seatings in Urban Landscape

Today,on the one hand,while the traditional design process continues,on the other hand,digital design systems along with advances in computer technologies continue to present designers with new and effective ideas.Parametric design is preferred by designers for its relationality,contributing toward versatility,ensuring flexibility,simplifying diversification,and for presenting programmatic solutions.As is seen in a number of areas,we have also begun to encounter the use of parametric designs produced with parametric design systems and wooden materials in urban landscaping.The purpose of this study is to examine the upper cover application and seating elements generated by taking advantage of parametric designs from wooden construction materials in urban landscaping areas,and examine the impact of wooden material characteristics while generating behavior and parametric structures of technologies.After researching parametric design and wooden material concepts,an attempt was made to reach conclusions through analyses conducted by examining parametric wooden designed pavilion and seating element specimens applied in various regions of the world.

An integrated simulation method for PVSS parametric design using multi-objective optimization

An adequate strategy for achieving energy efficiency when designing a photovoltaic shading system(PVSS)shall find an equilibrium between sunlight heat gain and daylight trans-mittances through effective analysis tools in a building’s early design phases.However,traditional simulation methods are either time-consuming or lacking architectonical thinking.This paper proposes a new method for architects to integrate thermal and daylighting performance by using parametric script modelling and optimize their balance with multi-objective optimization(MOO)algorithm in PVSS design.A case study was conducted to demonstrate the workflow of proposed integrated simulation method in PVSS design,and further compared the results with that of three single-objective optimizations under the same design requirement.The findings show that the integrated framework is a feasible method for PVSS design and can be extended into the design of other advance shading system or building integrated photovoltaic.

Parametric Structural Optimization of 2D Complex Shape Based on Isogeometric Analysis

The geometric model and the analysis model can be unified together through the isogeometric analysis method,which has potential to achieve seamless integration of CAD and CAE.Parametric design is a mainstream and successful method in CAD field.This method is not continued in simulation and optimization stage because of the model conversion in conventional optimization method based on the finite element analysis.So integration of the parametric modeling and the structural optimization by using isogeometric analysis is a natural and interesting issue.This paper proposed a method to realize a structural optimization of parametric complex shapes by using isogeometric analysis.By the given feature curves and the constraints,a feature frame model is built.Based on the feature frame model,a parametric representation of complex shape is obtained.After adding some auxiliary curves,the feature frame model is divided into many box-like patches in three dimension or four-sided patches in two dimension.These patches are built into parametric patches by using volume interpolation methods such as Coons method.Based on the parametric patches,isogeometic analysis is applied.Thus,the relationships are constructed among the size parameters,the control points and the physical performance parameters.Then the sensitivity matrix could be derived based on the relationships.The size optimization is carried out in the first stage by taking the size parameters as variables.Based on the result of size optimization,shape optimization with the constraints of stress is carried out in the second stage by taking the control points as variables.Serval planar complex shapes are taken as example to verify our method.The results verify that the parametric modeling and structural optimization can be united together without model conversion.Benefit from this,the optimization design can be executed as a dark box operation without considering the concrete modeling and analysis by input of the sizes,constraints and loads.

Three-Dimensional Concurrent Design System for Walking-Beam Furnace

This paper focuses on the problem of low efficiency and limited non-geometric information handling ability in the process of 2D heating furnace design, proposes a 3D concurrent parametric design system, this method is realized by parametric design technology, which is supported by ActiveX-Automation technology and VBA technology, mutual visit between application programs makes batched modeling become possible, key dimensions are linked with each other by restrictions, so parts can be built concurrently by sharing few parameters between common borders, designer can be free from repeated drawing work during modification, Solid Edge is chosen as the modeling server, a secondary development software is programmed by Visual Basic, this system provides a feasible way to overlap time between different sections, the design efficiency and quality is improved significantly.

Conceptual design and heat transfer performance of a flat-tile water-cooled divertor target

The divertor target components for the Chinese fusion engineering test reactor(CFETR)and the future experimental advanced superconducting tokamak(EAST)need to remove a heat flux of up to20 MW m-2.In view of such a high heat flux removal requirement,this study proposes a conceptual design for a flat-tile divertor target based on explosive welding and brazing technology.Rectangular water-cooled channels with a special thermal transfer structure(TTS)are designed in the heat sink to improve the flat-tile divertor target’s heat transfer performance(HTP).The parametric design and optimization methods are applied to study the influence of the TTS variation parameters,including height(H),width(W*),thickness(T),and spacing(L),on the HTP.The research results show that the flat-tile divertor target’s HTP is sensitive to the TTS parameter changes,and the sensitivity is T>L>W*>H.The HTP first increases and then decreases with the increase of T,L,and W*and gradually increases with the increase of H.The optimal design parameters are as follows:H=5.5 mm,W*=25.8 mm,T=2.2 mm,and L=9.7 mm.The HTP of the optimized flat-tile divertor target at different flow speeds and tungsten tile thicknesses is studied using the numerical simulation method.A flat-tile divertor mock-up is developed according to the optimized parameters.In addition,high heat flux(HHF)tests are performed on an electron beam facility to further investigate the mock-up HTP.The numerical simulation calculation results show that the optimized flat-tile divertor target has great potential for handling the steady-state heat load of 20 MW m-2under the tungsten tile thickness<5 mm and the flow speed7 m s^(-1).The heat transfer efficiency of the flat-tile divertor target with rectangular cooling channels improves by13%and30%compared to that of the flat-tile divertor target with circular cooling channels and the ITER-like monoblock,respectively.The HHF tests indicate that the flat-tile divertor mock-up can successfully withstand 1000 cycles of20 MW m-2of heat load without visible deformation,damage,and HTP degradation.The surface temperature of the flat-tile divertor mock-up at the 1000th cycle is only930℃.The flat-tile divertor target’s HTP is greatly improved by the parametric design and optimization method,and is better than the ITER-like monoblock and the flat-tile mock-up for the WEST divertor.This conceptual design is currently being applied to the engineering design of the CFETR and EAST flat-tile divertors.

An Integrated Die Casting Design System

Die casting process is one of the prime options for m anufacturing precisely dimensioned, sharply defined metal parts. The design of d ie casting dies comprises several stages and entails a large amount of time. Tra ditionally, the different stages of the die design were not integrated but exist as separate entities. Moreover, recurring modifications or even redesigns are r equired due to the complexity in achieving an accurate initial die design. As a result, die design is usually time-consuming and costly with respect to resourc es. The die casting industry will greatly benefit if proper application software are developed that integrates the different die design stages and allows editin g of die design as and when needed. Hence it is imperative to create an integrat ed die design system that shortens the die design time. This paper presents a research that establishes a prototype of an integrated die design system. It is developed using the commercial SolidWorks CAD system and n amed DiWorks. The aim of building the system on a commercial CAD system is to ut ilise the resources and features of the CAD system to speed up the die design pr ocess. DiWorks consists of six distinct modules: Project Manager, Cavity Insert Builder, Gating System Constructor, Die Base Designer, Ejector System Constructo r and Standard Components Library. Through these six modules, the die designer c an create a complete die casting die beginning from a product part model. It is a user-friendly system that allows both experienced and novice die designers to easily accomplish the task of die design. The practical goal of this research is twofold: to develop a system that integra tes the die design process and at the same time facilitates the editing of d ie design during or after the course of the design process. The research approac h includes (i) parametric design, (ii) feature-based design (iii) system modeli ng and implementation. Parametric design deals with variable dimensions as contr ol parameters, and it is an efficient tool for creating models based on paramete rs. Parametric design not only increases the design efficiency, but also makes t he updates and modifications of existing designs easier and faster, since these can be achieved by changing the parameters of the parametric model. Feature-bas ed design is used to design a product with features that are functionally define d by attributes and are geometrically represented by a set of parameters. The re sults of this research will aid the automation of the die design process, thus i mproving the efficiency and quality of, and reducing the cost of die design.

Multi-objective aerodynamic optimization design of high-speed maglev train nose

Purpose–The nose length is the key design parameter affecting the aerodynamic performance of high-speed maglev train,and the horizontal profile has a significant impact on the aerodynamic lift of the leading and trailing cars Hence,the study analyzes aerodynamic parameters with multi-objective optimization design.Design/methodology/approach–The nose of normal temperature and normal conduction high-speed maglev train is divided into streamlined part and equipment cabin according to its geometric characteristics.Then the modified vehicle modeling function(VMF)parameterization method and surface discretization method are adopted for the parametric design of the nose.For the 12 key design parameters extracted,combined with computational fluid dynamics(CFD),support vector machine(SVR)model and multi-objective particle swarm optimization(MPSO)algorithm,the multi-objective aerodynamic optimization design of highspeed maglev train nose and the sensitivity analysis of design parameters are carried out with aerodynamic drag coefficient of the whole vehicle and the aerodynamic lift coefficient of the trailing car as the optimization objectives and the aerodynamic lift coefficient of the leading car as the constraint.The engineering improvement and wind tunnel test verification of the optimized shape are done.Findings–Results show that the parametric design method can use less design parameters to describe the nose shape of high-speed maglev train.The prediction accuracy of the SVR model with the reduced amount of calculation and improved optimization efficiency meets the design requirements.Originality/value–Compared with the original shape,the aerodynamic drag coefficient of the whole vehicle is reduced by 19.2%,and the aerodynamic lift coefficients of the leading and trailing cars are reduced by 24.8 and 51.3%,respectively,after adopting the optimized shape modified according to engineering design requirements.

A Shakedown Strength Based Parametric Optimization Technique and Its Application on an Airtight Module

In aerospace engineering,design and optimization of mechanical structures are usually performed with respect to elastic limit.Besides causing insufcient use of the material,such design concept fails to meet the ever growing needs of the light weight design.To remedy this problem,in the present study,a shakedown theory based numerical approach for performing parametric optimization is presented.Within this approach,strength of the structure is measured by its shakedown limit calculated from the direct method.The numerical method developed for the structural optimization consists of nested loops:the inner loop adopts the interior point method to solve shakedown problems pertained to fxed design parameters,while the outer loop employs the genetic algorithm to fnd optimal design parameters leading to the greatest shakedown limit.The method established is frst verifed by the classic plate-with-a-circular-hole example,and after that it is applied to an airtight module for determining few key design parameters.By carefully analyzing results generated during the optimization process,it is convinced that the approach can become a viable means for designing similar aerospace structures.

Computational design in architecture:Defining parametric,generative,and algorithmic design

Computation-based approaches in design have emerged in the last decades and rapidly became popular among architects and other designers.Design professionals and researchers adopted different terminologies to address these approaches.However,some terms are used ambiguously and inconsistently,and different terms are commonly used to express the same concept.This paper discusses computational design(CD)and proposes an improved and sound taxonomy for a set of key CD terms,namely,parametric,generative,and algorithmic design,based on an extensive literature review from which different definitions by various authors were collected,analyzed,and compared.

Urban microclimate and energy consumption:A multi-objective parametric urban design approach for dense subtropical cities

Climate change within the urban contexts is a crisis that cities are confronting globally.This issue poses numerous negative consequences such as thermal discomfort and increased energy usage within the building sector.This is especially the case in Western Sydney,Australia,where the average maximum temperature has risen by 7—8℃ within the past 30 years.This increase in temperature is highly concerning,since this region is witnessing rapid urban and infrastructural development and is proposed as the third-largest economy of Australia.Temperature changes in this region will also result in considerably increasing the electricity used for cooling purposes.This paper presents a parametric approach driven multi-objective optimization methodology to discover optimum design solution based on the urban microclimate and cooling energy demand of multi-functional buildings within this urban context.Mitigation measures including a range of design factors at both building(typology and window to wall ratio)and urban scales(aspect ratio and urban grid rotation)are further suggested for developing context sensitive optimum urban layouts.The resultant solutions indicate an improvement in urban thermal comfort,cooling and heating energy use by up to 25.85%,72.76%,and 93.67%,respectively.

论参数化建筑空间造型设计艺术

要建筑参数化设计是运用智能软件构建出一系列具有特殊数学关系的几何模型,修改其中一个单位模型的参数,其他模型都作出相应修改的过程。建筑师、结构师、设备师各专业之间的图纸衔接极为精密,设计和施工效率比传统设计方式大大提高。通过参数化设计手段能够快速生成大量绚丽多姿的建筑空间造型设计方案,供建筑师和业主挑选。在未来建筑参数化设计大量盛行的时候,我们的地球会进入流动城市时代。该文重点论述了建筑参数化设计的技术本质、技术平台及优劣要素。

UHPFRC Folded Pavilion

The aim of the Student Workshop “Material Optimization and Geometric Exploration” (ENSA Paris-Belleville and University of Naples Federico II) is to discover the possibilities offered by new materials, starting from their characteristics. The final goal is to build a synthetic pavilion, which in the last session demonstrates ultra-high performances fibre reinforced concrete (UHPFRC) capacities. Designing with UHPFRC requires thinking simultaneously about the geometry, the static, the casting (mainly precast) and the implementation process. The design of the pavilion starts with a widespread geometric exploration using a phylogenetic tree. This approach has the advantage of exploring different designs at the same time without enclosing the creative process in one path. The geometry of the final pavilion is based on a folded surface, called “Yoshimura”, made out of rows of triangles. The profile of the pavilion is bent in order to create a double curvature and so, more stability. The modules are multiplied asymmetrically to minimize the number of the moulds, having at the end just one mould for each row of triangles. The moulds are made with polyethylene terephthalate glycol (PETG) laser-cut sheets which have been folded afterwards. This process has been chosen for both the smooth finishing it delivers and the simplicity of the fabrication process.

拓展与跨界——Hanif Kara的结构探索

参数化设计时代,工程师必须通过大幅度的技术拓展来满足建筑师多元化的设计目标。本文通过对结构工程师Hanif Kara实践成果的分析,探讨了当前参数化设计模式下工程师的技术拓展路径并对比研究了Hanif Kara与其他结构工程师对待专业跨界行为的不同姿态。

Designing broadband fiber optic parametric amplifier based on near-zero single ZDW PCF with ultra-flat nature

We propose a broadband fiber optic parametric amplifier(FOPA) based on a near-zero ultra-flat dispersion profile with a single zero-dispersion wavelength(ZDW) by using a selective liquid infiltration technique.The amplifier gain and bandwidth is investigated for a variety of fiber lengths, pump power, and operating wavelengths. It is observed that sufficient peak gains and broader bandwidths can be achieved with a small negative anomalous dispersion(β2≤ 0) and a positive value of the 4th-order dispersion parameter(t β4)around the pump. We can optimize an FOPA with a bandwidth of more than 220 nm around the communications wavelength.

相似与真实——探析建筑师Kas Oosterhuis对类参数化主义的批判

自20世纪80年代"参数化设计"被贴上"主义"的标签,近年来"类参数化"现象凸显,很大程度上影响了参数化设计理论与思维的良性发展。通过探析荷兰建筑师卡斯·乌斯特惠斯对类参数化主义深入显出的批判,结合其在荷兰代尔夫特理工大学及ONL事务所的研究与设计实践,明晰了参数化设计的本质,并强调参数化设计追求的并不是形式的相似,而是关系的真实。

结构符号学 构造壳体结构的符号学潜力

在如今复杂的网络化社会中,"连接"成为建筑师的核心能力,其目标是建立一个类似多方沟通机制下的建筑环境。基于不同荷载或符号学情况的结构系统的适应性差异化为"构造连接"提供了许多的机会。由此,这种差异化使"构造连接"比现代主义的、均质的重复秩序更具辨识性。为了充分开发这点,建筑师需要和工程师紧密合作,寻找最合适的选择。建筑物是高度整合的系统体系,各系统相互关联、相辅相成以满足建筑、结构、功能、空间、符号和氛围的要求。维也纳哈迪德工作室秉承"参数化主义"的教学议题,一直努力将这些不同层级的系统无缝整合进数字化设计过程中。工作坊的项目"参数化符号学——里约热内卢2016年奥林匹克公园"研究了参数化生成建筑形式的符号学能力,为体育场所及其相关项目设施开发了非常具有创新性的空间模型。为此,符号和结构便成了参数化模型的驱动层级,以测试"构造连接"的符号学潜力。这随后带来了壳体结构这一建筑原型的发展,它拥有根据符号学标准组织和分化的潜力,并能因其自身结构逻辑和周遭场地环境而进一步连接。这篇文章讨论的便是这一设计研究及其所含理论、概念和策略的成果。