Assembly code generation from a feature-based geometric model

Design and implementation of a system for assembly code generation (from a feature-based geometric model) is discussed. Assembly code is further used in design for assembly evaluation procedures for produce assembly analysis. Assembly features are classified into three groups: geometric assembly features, non-geometric assembly features and operational assembly features. The first two groups of features have existed in computer-aided design databases, while the last one has existed in an assembly sequence. Algorithms for identifying the first two groups of features are presented. A tree processor to convert assembly features into assembly code is also developed. Finally, examples are presented.     

Process design data for prok chilling

In 1993 legislation is being enacted throughout the European Community (EC) that will require the maximum temperature of pork carcasses to be below 7°C before cutting or transportation. Results from a survey of UK abattoirs are summarized to highlight the problems and inadequacies of current commercial chilling systems. Design data are presented for conventional pork-chilling systems, which detail the effects of air temperature, air velocity and carcass weight on chilling times. Four novel or modified chilling systems are discussed: ultra-rapid chilling with air at −30°C; immersion chilling in brine at 0°C; ice-bank chilling in humid air at 2°C; and spray chilling in two stages, at 10°C for 2 h followed by 4°C for 21 h. The potential of such systems for the acceleration of chilling rates and for substantial weight savings is identified.     

A morphing method for shape generation and image prediction in product design

A shape morphing and image prediction method for product design is proposed in this article, in which a feature-based method is first used to construct 3-D CAD models of a product, then new shapes are generated with a shape morphing method and the images of the morphed shapes are analyzed using modified gray theory with Fourier residual correction. With the aid of this model, the designer can quickly obtain a product form and its corresponding image to help him/her to design the required product. Though LCD monitor design is applied, this method can also be used to develop other products.     

Investigating the influence of product perception and geometric features

Research in emotional design and Kansei Engineering has shown that aesthetics play a significant role in the appeal of a product. This paper contributes to establishing a methodology to identify the relationships between perceptions, aesthetic features, desire to own and background of consumers. Surveys were conducted with 71 participants to gather their perceptions of 11 vase concepts. Advanced statistical analyses, including mixed models, were applied to allow generalisation of the results beyond the data sample. Significant relations between the desire to own a product and how the product is perceived were found (the desire to own was found to be related to beautiful, expensive, elegant, exciting, feminine, common and dynamic vases), as well as between the perceptions and the parameters describing the form of the vases (a vase was perceived as beautiful if it had many curved lines and was simple and tall). An automated mixed model analysis was conducted and revealed that general rules can be found between aesthetic features, perceptions and ownership, which can apply across gender and culture. The findings include design rules that link aesthetic features with perceptions. These contribute to research as guidelines for design synthesis and can either be implemented via shape grammars or parametric modelling approaches. These rules are also interesting for 3D printing applications, especially important when the consumer is the designer. Some of these design rules are linked to the desire to own a product, they have implications for industry, and they offer guidelines to creating attractive products that people want to own.     

Process capability: a criterion for optimizing multiple response product and process design

In this research, we consider the maximization of process capability as the criterion in product/process design that is used for selecting preferred design factor levels and propose several approaches for single and multiple response performance measure designs. All of these approaches assume that the relationship between a process performance measure and a set of design factors is represented via an estimate of a response surface function. In particular, we develop; (i) criteria for selecting an optimal design, which we call MCpk and MCpm; (h) mathematical programming formulations for maximizing MCpk and MCpm, including formulations for maximizing the desirability index (Harrington, 1965) and for maximizing the standardized performance criteria (Barton and Tsui, 1991) as special cases of the formulation for maximizing MCpk, (iii) formulations for considering cost when maximizing MCpk and MCpm, (iv) a means for assessing propagation of error; (v) a robust design method for assessing design factor effects on residual variance; (vi) a means for assessing the optimality of a proposed solution: and (vii) an original application in the screening of printed circuit board panels.     

攻心产品设计方法

根据人的潜意识能影响人的意识和行为的原理,进行产品设计时充分考虑消费者和设计者的心理,通过产品的外形、色彩、包装、广告词等影响消费者的潜意识,使消费者在潜意识中产生拥有该产品的欲望,从而做出购买的行为,达到产品设计的目的.依据该方法,提出3个自动冲水的产品设计方案.     

Application of geometric programming to transformer design

This paper considers the transformer design optimization problem. In its most general form, the design problem requires minimizing the total mass (or cost) of the core and wire material while ensuring the satisfaction of the transformer ratings and a number of design constraints. The constraints include appropriate limits on efficiency, voltage regulation, temperature rise, no-load current, and winding fill factor. The design optimization seeks a constrained minimum mass (or cost) solution by optimally setting the transformer geometry parameters and the relevant electrical and magnetic quantities. In cases where the core dimensions are fixed, the optimization problem calls for a constrained maximum volt-ampere or minimum loss solution. This paper shows that the above design problems can be formulated in geometric programming (GP) format. The importance of the GP format stems from two main features. First, GP provides an efficient and reliable solution for the design optimization problem with several variables. Second, it guarantees that the obtained solution is the global optimum. The paper includes a demonstration of the application of the GP technique to transformer design. It also includes a comparative study to emphasize the advantage of including the transformer core dimensions as variables in the design problem.     

由太极图看中国产品设计风格之形成

"太极图"的辩证法则,是中国人最根本的思维方式,渗透到中国人的各种活动中.在产品设计过程中,要把最核心最传统的文化思想沉淀在产品中,使产品在外形、色彩、人机、内涵上,具有浓郁的中国底蕴.久而久之,水到渠成,形成我国的产品设计风格,既符合中国人的文化及哲学思想,又在时代发展和对外来文化的过滤吸收的基础上得到不断完善.     

Using product family evaluation graphs in product family design

Product family design and platform-based product development have garnered much attention. They have been used to provide nearly customised products to satisfy individual customer requirements and simultaneously achieve economies of scale during production. The inherent challenge in product family design is to balance the trade-off between product commonality (how well the components and functions can be shared across a product family) and variety (the range of different products in a product family). Quantifying this trade-off at the product family planning stage in a way that supports the engineering design process has yet to be accomplished. In this paper, we introduce a graphical evaluation method, the product family evaluation graph (PFEG), that allows designers to choose the ‘best’ product family design option among sets of alternatives based on their performance with respect to an ideal commonality/variety trade-off determined by a company's particular competitive focus, and guides designers towards a more desirable trade-off between commonality and variety in an existing product family. Two necessary supporting pieces for developing the PFEG are also proposed. One piece is the development of commonality and variety indices to quantitatively capture the degree of commonality and variety in a product family and its functions and components. We introduce two sets of commonality and variety indices–the CDI (commonality versus diversity index) for commonality (CDI_C) and variety (CDI_V), and the CMC (comprehensive metric for commonality) for commonality (CMC_C) and variety (CMC_V)–to achieve this. The other supporting piece is the development of a quantitative representation of the ideal trade-off between commonality and variety in a product family, known as the commonality/variety trade-off angle α, based on the elements that characterise a company's competitive focus and their industry-wide competitors. A linear regression model is used to link the qualitative competitive focus to a quantitative engineering perspective, and then to estimate the ideal trade-off angle. The commonality/variety trade-off angle can then be applied to the PFEG to help designers evaluate a product family or compare product family design alternatives. Most importantly, the PFEG is not just the graph of the two sets of indices; it is the representation of the commonality/variety trade-off relative to the desired competitive focus. Four families of power tools are used to illustrate how the computation of such indices supports product family design evaluation in the PFEG. In this paper, we only use the CDI in the example application, but the CMC can be computed using the same approach.     

现代产品设计中的适当设计理念

论证了在现代产品设计中提出适当设计理念的理由,阐述了适当设计的本质含义.并从消费需求、产品的功能、材料及造型等4个方面,对适当设计的具体运作方法进行了比较详细的分析和研究.同时也指出了,利用适当设计,可使产品能最准确地满足目标群体最真实、最合理的消费需求,以缓解当前因产品的过度设计所带来种种问题.     

A sustainable product design model

There are major challenges for the designer to now include Sustainable Development aspects into his/her design; particularly related to the social and wider economic impacts. The designer must, more than ever before, take into consideration the views and concerns of all the ‘interested parties’ – stakeholders. There are many topics – issues and concerns to consider and often they can be conflicting. The need is to examine the Sustainable Development risks and benefits associated with any particular design so improvements can be made. Both a ‘concept’ model and a Bournemouth University practical model are described which allows this risk/benefit assessment to be made in a structured manner on a wide range of topics. The assessment can examine the product, the company manufacturing the product and the manufacturing site. The major social, economic and environmental risks and benefits is tabulated or presented graphically for ease of evaluation in order to modify the design and so improve the Sustainable Development aspects.     

产品包装的人性化设计

产品和产品包装是不可分割的整体,在进行产品包装设计的时候,就要充分的考虑人的因素,不仅仅要考虑包装的基本功能,还要有很多和产品相关的人性化考虑.比如在包装给人的信息方面和使用方面,多站在使用者的角度来考虑.     

产品语义学和产品设计

通过语言与产品在符号现象上的异同对照,深入研究生活中的产品在设计上是如何运用产品语义学原理,进而对产品语义学理论进行广泛而深入地论述,得出产品语义学在具体的产品设计中的基本应用方法,重点阐释了产品语义学原理在产品的功能和使用方式上的具体应用方法,从而揭示产品语义学理论务实而注重人性化设计的精神内涵.     

儿童产品的人性化设计

研究了儿童的特点及分析儿童产品的现状,论述了对儿童产品进行人性化设计的必要性.在人性化设计理念的基础上,提出了对儿童产品的人性化设计原则;同时通过具体的实例论证人性化设计原则在儿童产品设计中的重要性.     

Multicriteria decision-aid approach for product end-of-life alternative selection

The selection of the best compromise alternative for treating a product at its end of life (EOL) is presented. Each EOL alternative has its own consequences from an economical, environmental and social point of view. The criteria used to determine these consequences are often contradictory and not equally important. In the presence of multiple conflicting criteria, an optimal EOL alternative rarely exists. Hence, the decision-maker should seek the best compromise EOL alternative. The present paper proposes a multicriteria decision-aid (MCDA) approach to aid the decision-maker in selecting the best compromise EOL alternative on the basis of his/her preferences and the performances of EOL alternatives with respect to the relevant environmental, social and economic criteria. This approach is important because it allows the user to consider various conflicting criteria simultaneously and it takes into account his/her preferences. The paper analyses the most important aspects of this approach such as the constitution of a set of EOL alternatives, the selection of a list of relevant criteria to evaluate the EOL alternatives and the choice of an appropriate multicriteria decision-aid method. A case study is provided to illustrate how the proposed approach can be used for product EOL alternative selection in real-world applications.     

产品设计中的形态创意

形态是产品设计中的一个重要因素,是产品与功能的中介,没有形态的中介作用,产品的功能就无法实现.探讨了产品形态的定义,论述了形态构成的基本原则,得出了产品形态创意的构成方法,旨在解决产品形态创意方面的问题.     

产品仿生设计探究

从产品自身的各要素来探究仿生设计的应用,相应地表现为对自然界万事万物的形、色、音、功能、结构等为研究对象,同时结合仿生学的研究成果,运用实例进行深入阐释,分析和探讨这一新的设计方法和理念.形成产品仿生设计系统观,为产品设计提供了新的思路和借鉴手法.