产品生命周期设计系统关键技术研究

提出了一种新的产品生命周期设计系统,此系统通过利用基于CAD/CAM特征建模技术,对产品生命周期清单进行分析,将生命周期评价的数据自动地反馈给设计过程,同时改进工艺规划。最后,应用具体的模具产品作为实例对机加工过程进行了评价,验证了此方法的可行性。

冷轧不锈钢无缝管材孔型设计优化系统

分析了二辊周期钢管冷轧的具体过程及特点,编制了一套孔型设计优化系统软件并对其使用方法和具体界面做了简要介绍,还给出了二辊周期钢管冷轧模具系统三维模型的绘制方法。

地域性文创产品可持续设计研究

围绕可持续理念,探讨地域性文创产品的可持续设计方法,使其在追求经济价值,文化特色的同时兼顾环境、社会以及经济可持续发展。分析了地域性文创产品的现状,总结了现阶段存在的一些问题。通过对地域性文创产品和可持续设计的相关文献研究和实地调研的方法,从产品全生命周期和系统设计两个方面结合当地的文化特色以及地理特点研究地域性文创产品的可持续设计。从产品设计和系统设计两个方面分别给出可持续设计方法。该设计方法可为地域性文创产品的可持续设计与发展提供参考。

ANN model of subdivision error based on genetic algorithm

According to the test data of subdivision errors in the measuring cycle of angular measuring system, the characteristics of subdivision errors generated by this system are analyzed. It is found that the subdivision errors are mainly due to the rotary-type inductosyn itself. For the characteristic of cyclical change, the subdivision errors in other measuring cycles can be compensated by the subdivision error model in one measuring cycle. Using the measured error data as training samples, combining GA and BP algorithm, an ANN model of subdivision error is designed. Simulation results indicate that GA reduces the uncertainty in the training process of the ANN model, and enhances the generalization of the model. Compared with the error model based on the least-mean-squared method, the designed ANN model of subdivision errors can achieve higher compensating precision.

Environmental Impact Optimization of Reinforced Concrete Slab Frame Bridges

The main objective of this research is to integrate environmental impact optimization in the structural design of reinforced concrete slab frame bridges in order to determine the most environment-friendly design. The case study bridge used in this work was also investigated in a previous paper focusing on the optimization of the investment cost, while the present study focuses on environmental impact optimization and comparing the results of both these studies. Optimization technique based on the pattern search method was implemented. Moreover, a comprehensive LCA （life cycle assessment） methodology of ReCiPe and two monetary weighting systems were used to convert environmental impacts into monetary costs. The analysis showed that both monetary weighting systems led to the same results. Furthermore, optimization based on environmental impact generated models with thinner construction elements yet of a higher concrete class, while cost optimization by considering extra constructability factors provided thicker sections and easier to construct. This dissimilarity in the results highlights the importance of combining environmental impact （and its associated environmental cost） and investment cost to find more material-efficient, economical, sustainable and time-effective bridge solutions.

A Quarter Century of Work to Revolutionize Architecture, Engineering and Construction Enterprise Information Systems

More than two decades ago, object-oriented representation of AEC （architecture engineering and construction） projects started to offer the promise of seamless communication of semantic data models between computer-based systems used from the design stage to the operation of the facilities. BIM （building information modelling） emerged and appeared as a means to store all relevant data generated during the life-cycle of the facilities. But this upstream view of the built environment, arising from the design and construction stages, extended to the downstream operations where building and industrial facilities appeared more and more as huge dynamic data producers and concentrators while being operated. This created new challenges leading to what is referred to as ISCs （intelligent and smart constructions）. The current state of the art is that final constructions still contain various and increasingly versatile control and service systems, which are hardly standardised, and not interconnected among themselves. Monitoring, maintenance and services are done by specialised companies, each responsible of different systems, which are relying on customised software and techniques to meet specific user needs and are based on monolithic applications that require manual configuration for specific uses, maintenance and support. We demonstrate in this paper that the early promises of integration across the actors and along the life-time of facilities have gone a long way but will only be delivered through enhanced standardisation of computerized models, representations, services and operations still not yet fully accomplished 25 years after work started.

α-Resolvable Cycle Systems for Cycle Length 4

An m-cycle system of order v and index λ, denoted by m-CS(v,λ), is a collection of cycles of length m whose edges partition the edges of λKv. An m-CS(v,λ) is α-resolvable if its cycles can be partitioned into classes such that each point of the design occurs in precisely α cycles in each class. The necessary conditions for the existence of such a design are m|λv(v-1)/2,2|λ(v -1),m|αv,α|λ(v-1)/2. It is shown in this paper that these conditions are also sufficient when m = 4.

Persuasibility and Its Assessment

Persuasive technology is the use of computers,devices or applications to change a person's attitudes or behavior.Persuasibility design within the system life-cycle is a nascent area of research which is different from design in the traditional method.This paper focuses on the research of persuasibility design and its assessment in the system life-cycle.A life-cycle oriented systemic general theory is developed in this paper to evaluate persuasibility design.Persuasibility assessment is considered as a part of persuasibility design.Its procedure and method are explored and analyzed based on the system life-cycle in this paper.A possible research direction is to create more explicit and detailed persuasion design and assessment methods which can be used not only in personal computer persuasive application,but also many other electric devices that are designed for persuasion purposes.