scholarly journals DESIGN MODIFICATION OF AN INNOVATIVE SPLIT-SINGLE TWO-STROKE ENGINE

2020 ◽  
Vol 1 ◽  
pp. 2581-2588
Author(s):  
A. Zahn ◽  
P. Diwisch ◽  
F. Rieg ◽  
B. Alber-Laukant

AbstractA prototype of an innovative split-single two stroke engine is presented. With the aim of increasing the power-to-weight ratio for later mobile use, the individual engine components have to be revised. The focus is on the development process for the redesign of the crankcase. Through a preliminary examination of the necessary CAx systems, an iterative process chain that combines suitable synthesis and analysis tools is derived. This includes the design of the machine elements, a numerical strength verification using FEM and preparing the model for machining.

Author(s):  
Jacqueline B. Barnett

The application of ergonomics is important when considering the built environment. In order to create an environment where form follows function, a detailed understanding of the tasks performed by the individuals who will live and work in the facility is required. Early involvement in the project is key to maximizing the benefit of ergonomics. At Sunnybrook and Women's College Health Sciences Centre in Toronto, Canada, this early intervention was embraced during the design process of a behavioural care unit for aggressive patients. The ergonomist was involved in three phases of design; user needs analysis, block schematics and detailed design. The user needs and characteristics were established using a combination of focus groups, interviews, direct observation, task analysis and critique of current working environments. The challenge was to present the information to the design team in a useful manner. The format chosen was a modification of Userfit (Poulson 1996) that outlined the various characteristics of the patient group and the design consequences with “what does this mean for me” statements. During the block schematics phase an iterative design process was used to ensure that the ergonomic principles and the user needs were incorporated into the design. Ergonomic input was used in determining the room sizes and layout and to ensure work processes were considered. Simple mock-ups and anthropometric data assisted in illustrating the need for design changes. Examples that highlight the areas of greatest impact of ergonomic intervention include the patient bathrooms, showers and tub room. Significant changes were made to the design to improve the safety of the work and living space of the end users. One of the greatest challenges was having an appreciation for the individual goals of the team members. Ensuring there was adequate space for equipment and staff often resulted in recommendations for increased space. This in turn would increase the cost of the project. The architect and, later in the project, the engineer had goals of bringing the project in on budget. The final design was very much a team effort and truly die result of an iterative process. The sum of the individual contributions could not match the combined efforts. It was only through the ergonomic contributions in this early design phase that the needs of the staff, patients and families could be so well represented. The success of the iterative process provides the foundation for bringing ergonomics considerations into the early design stages of future projects.


Author(s):  
Karl-H. Grote ◽  
Christiane Beyer

Abstract In socialistic countries, customer satisfaction and the market conditions were not of high priority: Some selected parts of the market products were of satisfactory costs and quality to customers. Quality and costs of a product decide on its success in the world-wide market. The wishes and expectations of the customer for a high-quality and low-priced product continue to grow, however, with the desire for faster availability of this product. The customer determines also the delivery time and other competitive factors as the durability of the product. At present the trend goes towards shorter product life cycles, which in turn requires reduced time spent on the product development. With these complex market requirements and growing diversity of the products the engineer faces new challenges in his development tasks. It can be paraphrased as follows: In reduced lifecycles a quality-assured and advantageous product has to be developed despite increasing complexity of the design and demands for reduction of material used, manpower and monetary spending. For the solution of this complex problem the following suggestions are tested and implemented: • Structured design process for the development process, • Simultaneous work where ever possible during the development stages, • Employment of modern resources for the product development, • Use of information technology and • Implementation of rapid prototyping for models and in secondary manufacturing processes. An important research field at the Department of Mechanical Engineering Design at the Otto-von-Guericke-University Magdeburg is research and further development of productive procedures and tools for the realization of a computer integrated product development process. This process includes the effective application of technologies to produce the prototypes for presentation, producibility analysis and production. Of particular interest is the closed process chain (loop) from Solid Modeling via Rapid Prototyping and 3D-Digitizing where the entry point of this process chain depends on the needs of the application or particular interest of the innovating company. Information for faster and more competitive preparation, verification and Re-Engineering of existing and established products, which have to be adjusted to the world-market needs, will be made available. The results of this applied research offer opportunities to display new developed products for the lagging industries in the former East Germany, and furthermore arranging for necessary venture capital to produce the product, to gain information about possible suppliers and manufacturing opportunities in order to minimize the investors’ risks of an enterprise.


2021 ◽  
Author(s):  
◽  
Lynne Carmichael Allan

<p>The role that the physical environment of an exhibition plays in the visitor's experience of a museum is a topic that, though increasingly acknowledged in museum studies, has not yet received detailed attention from researchers. The interaction of exhibitor and visitor, in and through exhibitions, can be situated in the wider context of the recent paradigm shirt within museum practice, towards communication with the public and developments in museum theory, which consider the qualitative aspects of the visitor experience as an active dialogue, conversation or a process of meaning-making. This dissertation examines the interactive exhibit Stowaways in the permanent exhibition, Blood, Earth, Fire - Whāngai, Whenua, Ahi Kā, at the Museum of New Zealand Te Papa Tongarewa. It considers the question 'How does the physical environment affect the meanings that the visitor makes in and after visiting the exhibition?' The study builds on existing New Zealand research, which questioned the gap between exhibition creation and visitor reception. A theoretical framework was constructed from relevant strands of the literature of museum studies, visitor studies and exhibition design. A qualitative approach was employed, in order to examine in detail both the exhibition development process and then how the visitor responded to the exhibition. Several methods were used to conduct the research, such as archival research and interviews with both the museum staff and seven visitors, who came with their families to the exhibit. The findings provide interesting evidence of the complex and deep affect that the built exhibition space can have on the visitor, not just at the time of the visit but long afterwards. This was an affect that rippled out from the individual to their family group and everyday life. This dissertation makes a small but significant contribution to museum studies in New Zealand, through an integrated examination of the production and reception of a museum exhibit, from the perspective of both the visitor and the museum. One of the main conclusions was to re-iterate the important role of exhibition evaluation in facilitating a more complete communication between museum and visitor, by allowing museum professionals to build on the experience of the development process in a way that can inform future practice.</p>


2018 ◽  
Vol 2 (4-2) ◽  
pp. 349
Author(s):  
Ivaylo Kamenarov ◽  
Katalina Grigorova

This paper describes the internal data model for a business process generator. Business process models are stored in an Event-driven process chain notation that provides a natural way to link the individual elements of a process. There is a software architecture that makes it easy to communicate with users as well as external systems.


Author(s):  
Aditya Balu ◽  
Sambit Ghadai ◽  
Gavin Young ◽  
Soumik Sarkar ◽  
Adarsh Krishnamurthy

The widespread adoption of computer-aided design (CAD) and manufacturing (CAM) tools has resulted in the acceleration of the product development process, reducing the time taken to design a product [46]. However, the product development process, for the most part, is still decentralized with the design and manufacturing reviews being performed independently, leading to differences between as-designed and as-manufactured component. A successful product needs to meet its specifications, while also being manufacturable. In general, the design engineer ensures that the product is able to function according to the specified requirements, while the manufacturing engineer gives feedback to the design engineer about its manufacturability. This iterative process is often time consuming, leading to longer product development times and higher costs. Recent researches in integrating design and manufacturing [24, 28, 46] have tried to reduce these differences and making the product development process easier and accessible to designers, who may not be manufacturing experts. In addition, there have been different efforts to enable a collaborative product development process and reduce the number of design iterations [8, 10, 41]. However, with the increase in complexity of designs, integrating the manufacturability analysis within the design environment provides an ideal solution to improve the product design process.


2015 ◽  
Vol 1800 ◽  
Author(s):  
Martina Decker

ABSTRACTThis paper investigates the development process of emergent materials for architecture by looking at the example of Phase Change Materials. In the context of the complex nature of the constructed environment and the functional and performance requirements for buildings, emergent materials have to be carefully tuned for maximum performance. Investigating the relationship of time, space and matter in the design and development process through interdisciplinary endeavors is at the heart of this investigation. Furthermore, a shift from multidisciplinary endeavors to truly interdisciplinary collaboration that crosses the traditional boundaries of the individual fields is suggested.


Author(s):  
Salim Azzouz ◽  
Guy Bernard

This project describes the collaboration of two instructors, one from the mechanical engineering department and one from the mathematics department with a group of mechanical engineering students to build and analyze a new type of transportation transmission. Current transmissions have torque limitations when working at various vehicle loading conditions. The ideal vehicle transmission is a continuously variable transmission that delivers optimum torque at any loading condition. The motivation for this research project is to design a new transmission that would increase the number of gear ratios using a chain element, and consequentially, increasing the number of available torques to achieve better overall vehicle performance. The new transmission consists of two planetary gears systems linked by a chain. It includes multiple inputs and outputs with the possibility of using one of the outputs to drive other engine components. The system is currently investigated for all possible gear ratios and usable torque configurations. The gear ratios are determined using Willis’s formula for planetary gear systems. All possible gear combinations are investigated and their gear ratios mathematically determined. A prototype was designed and built. It is being automatized, currently.


2012 ◽  
Vol 4 (2) ◽  
pp. 220-226 ◽  
Author(s):  
Drew M. Keister ◽  
Daniel Larson ◽  
Julie Dostal ◽  
Jay Baglia

Abstract Background Despite the movement toward competency-based assessment by accrediting bodies in recent years, there is no consensus on how to best assess medical competence. Direct observation is a useful tool. At the same time, a comprehensive assessment system based on direct observation has been difficult to develop. Intervention We developed a system that translates data obtained from checklists of observed behaviors completed during educational activities, including direct observation of clinical care, into a graphic tool (the “radar graph”) usable for both formative and summative assessment. Using unique, observable behaviors to evaluate levels of competency on the Dreyfus scale, we assessed resident performance in 6 learning sites within our residency. Data are represented on a radar graph, which residents and faculty used to recognize both strengths and areas for growth to guide educational planning for the individual learner. Results Initial data show that the radar graphs have construct validity because the development process accurately reflects the desired construct, assessors were adequately trained, and the radar graphs demonstrated resident growth over time. A form completion rate of 90% for &gt;1500 disseminated assessments suggests the feasibility of our process. Conclusions The radar graph is a promising tool for use in resident feedback and competency assessment. Further research is needed to determine the full utility of the radar graphs, including a better understanding of the tool's reliability and construct validity.


2017 ◽  
Vol 38 (5) ◽  
pp. 900-925 ◽  
Author(s):  
ALISON BOWES ◽  
ALISON DAWSON ◽  
CORINNE GREASLEY-ADAMS ◽  
LOUISE MCCABE

ABSTRACTThe paper considers a process of developing evidence-based design guidelines to be used in environments where people with dementia and sight loss are living. The research involved a systematically conducted literature review and a series of consultations with people affected by dementia and/or sight loss who lived or worked in care homes or in domestic settings. Findings from the literature and the consultations were used in an iterative process to develop the guidelines. The process is outlined, providing examples from the guidelines about lighting and colour and contrast. In discussing the research findings and the development process, the authors consider implications of the work including the weakness of the evidence base, the challenges of improving this and the need for innovative approaches to understanding the complexities of design for people with dementia and sight loss. They highlight the emphasis in the literature on independence for people with sight loss and the focus on control of people with dementia, arguing that this falls short of a genuinely person-centred approach, which recognises the active participation of people with dementia and sight loss.


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