Redesign optimization for manufacturing using additive layer techniques

Improvements in additive manufacturing technologies have the potential to greatly provide value to designers that could also contribute towards improving the sustainability levels of products as well as the production of lightweight products. With these improvements, it is possible to eliminate the design restrictions previously faced by manufacturers. This study examines the principles of additive manufacturing, design guidelines, capabilities of the manufacturing processes and structural optimisation using topology optimisation. Furthermore, a redesign methodology is proposed and illustrated through a redesign case study of an existing bracket. The optimal design is selected using multi-criteria decision analysis method. The challenges for using additive manufacturing technologies are discussed

Re-designing Batik Mbako Motif Pattern

Batik Mbako as one of Indonesian local textile from Temanggung, has been developed since 2009. Mbako means temba-kau (tobacco) became inspiration for batik motif by local society. More than 30 pattern motif of Batik Mbako exist, some of them have been legally recognized by government. Nowadays, the development of motif design is less varied regarding to the lack of innovation design and has a potential to be redesign with new composition. The purpose of this paper is to create the innovation of motif pattern design composition for Batik Mbako. The methodology used by this paper was by reviewing and analysing the original Mbako motif pattern, creating new concept and redesign the shape of Mbako motif pattern. The main result of this paper was the innovation of motif pattern design for the form of original Batik Mbako motif, with three different concept and target market. This paper hopeful encourages people outside Temanggung to getting know more about Batik Mbako and gain the popularity for it. In the future those new motif design could be use by local artisan. Keywords batik, mbako, motif, pattern, desig

Optimizing the Safety Margins Governing a Deterministic Design Process while Considering the Effects of a Future Test and Redesign on Epistemic Model Uncertainty

At the initial design stage, engineers often rely on low-fidelity models that have high uncertainty. Model uncertainty is reducible and is classified as epistemic uncertainty; uncertainty due to variability is irreducible and classified as aleatory uncertainty. In a deterministic safety-margin-based design approach, uncertainty is implicitly compensated for by using fixed conservative values in place of aleatory variables and ensuring the design satisfies a safety-margin with respect to design constraints. After an initial design is selected, testing (e.g. physical experiment or high-fidelity simulation) is performed to reduce epistemic uncertainty and ensure the design achieves the targeted levels of safety. Testing is used to calibrate low-fidelity models and prescribe redesign when tests are not passed. After calibration, reduced epistemic model uncertainty can be leveraged through redesign to restore safety or improve design performance; however, redesign may be associated with substantial costs or delays. In this work, the possible effects of a future test and redesign are considered while the initial design is optimized using only a low-fidelity model. The goal is to develop a general method for the integrated optimization of the design, testing, and redesign process that allows for the tradeoff between the risk of future redesign and the associated performance and reliability benefits. This is accomplished by formulating the design, testing, and redesign process in terms of safety-margins and optimizing these margins based on expected performance, expected probability of failure, and probability of redesign. The first objective of this study is to determine how the degree of conservativeness in the initial design relates to the expected design performance after a test and possible redesign. The second objective is to develop a general method for modeling epistemic model uncertainty and calibration when simulating a possible future test and redesign. The third objective is to apply the method of simulating a future test and redesign to a sounding rocket design example

Iterative design for active control of fluid flow

This paper considers iterative controller design for planar Poiseuille flow by model unfalsification and controller redesign. The main contribution is to show that model-unfalsification-based iterative design can be useful in flow control problems. The a priori knowledge of the dynamics of the sampled system is obtained from the analytic approximation of the Navier-Stokes equations by a Galerkin method. Pole-positions, expected model orders and feasible dynamic variations are valuable prior knowledge which can be taken into account in the uncertainty-model unfalsification-based iterative design scheme developed

Gestalt Theory in Visual Screen Design — A New Look at an old subject

Although often presented as a single basis for educational visual screen design, Gestalt theory is not a single small set of visual principles uniformly applied by all designers. In fact, it appears that instructional visual design literature often deals with only a small set of Gestalt laws. In this project Gestalt literature was consulted to distil the most relevant Gestalt laws for educational visual screen design. Eleven laws were identified. They deal with balance/symmetry, continuation, closure, figure-ground, focal point, isomorphic correspondence, prŠgnanz, proximity, similarity, simplicity, and unity/harmony. To test the usefulness of these laws in visual screen design they were applied to the redesign of an instructional multimedia application, 'WoundCare', designed to teach nursing students wound management. The basic text-based screens in the original WoundCare application were replaced with graphical user interface screens, that were designed according to these principles. The new screen designs were then evaluated by asking students and others to compare the designs. The viewers were also asked to rate directly the value of using the eleven Gestalt design principles in the redesign, both for improving the product's appearance and improving its value for learning. The evaluation results were overwhelmingly positive. Both the new design and the value of applying the eleven Gestalt laws to improve learning were strongly supported by the students' opinions. However, some differences in the value of applying particular Gestalt laws to the interface design were identified and this forms a useful direction for future research

Exploring student engagement for Generation Y: a pilot in Environmental Economics

This paper reports on a pilot study involving the redesign of a third year Economics subject according to principles of engagement as they relate to the discursive Generation y student. The study involved a review of the literature, redesign of the subject to a blended learning format and evaluation of the design. The data collected included pre and post NSSE scores, subject grades, student surveys and qualitative feedback from individual students. While the redesign of the subject was constrained by available resources, and the implementation hindered by various systemic factors, it was found that in general the redesign did improve student engagement. In particular, it was found that the success of the scaffolded assessment tasks and the use of in-class activities as a means of revising for exams was significant. One issue that continues to perplex is the students’ mixed attitudes to attending lectures. Perhaps most importantly, the study indicates that by third year where traditional modes of teaching have characterised their curriculum, students have developed surface approaches to learning that cannot be corrected through individual third year courses.student engagement, elearning, generation y

VSS : a VHDL synthesis system

This report describes a register transfer synthesis system that allows a designer to interact with the design process. The designer can modify the compiled design by changing the input description, selecting optimization and mapping strategies, or graphically changing the generated design schematic. The VHDL language is used for input and output descriptions. An intermediate representation which incorporates signal typing and component attributes simplifies compilation and facilitates design optimization. The compilation process consists of two phases. First, a design composed of generic components is synthesized from the input description. Second, this design is translated into components from a particular library by a mapper and optimized by a logic optimizer. Redesign to new technologies can be accomplished by changing only the component library

Subsystems change ranking methodology (SCRaM) for complex product redesign process

Product redesign is hardly a straightforward process, especially for complex products. The existence of intricate interrelationships between different components of product design architecture makes it more susceptible to change propagation phenomenon. In this case, redesign risk is not easy to predict since the change effects are being propagated to other components from the initiating change component. Because of this condition, choosing the right initiating change component is essential to control redesign process risks, apart from being able to successfully satisfy the product requirements. With this notion, this paper proposes a method that systematically ranks all components of an existing product design based on their estimated redesign risk. By having this information, designers can make a better redesign planning. The demonstration of this method is presented through an example aircraft redesign case study

Practice As Pedagogy: Learning Through Participation In The Caribexams Online Community Of Practice

The purpose of this study was to develop community redesign strategies to support community members\u27 participation in the CaribExams online Community of Practice and to investigate the impact of these strategies on members\u27 participation levels and trajectories. CaribExams online community was developed to assist out-of-school learners who were preparing to sit for the Caribbean Examinations Council\u27s regional English exam. The redesign project was developed to address an ongoing problem of low participation by members in the online community. A second purpose of the study was to investigate and empirically validate theoretically grounded design principles based on social practice learning theory advanced by Lave and Wenger (1991). Using a theory-grounded design method the critical attributes of the Community of Practice concept were extracted from the social practice learning theory framework. Generalized design principles were developed based on concept attributes and these were contextualized into redesign strategies for the CaribExams online community redesign project. The redesign strategies were implemented over a four week period. 20 CaribExams community members agreed to participate in the study. The design and development study used a mixed method research design and collected data using semi-structured interviews, website data logs and participant observation. Results revealed that although members\u27 participation in the CaribExams online community improved as a result of the redesign strategies, these changes were not significant nor maintained long enough to represent a sustained trajectory toward full participation. Members\u27 participation levels were only minimally affected by the implementation of the redesign strategies