7,819 research outputs found

    DEVELOPMENT OF AN ELECTRONICALLY-CONTROLLED, MULTIDOSE, NASAL, DRUG-DELIVERY DEVICE

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    In recent years, the nasal route has received a great deal of attention as convenient and reliable method of systemic administration of drugs, due to its benefits of reduced pain, precise drug delivery and eliminated risk of intravenous needles. The pharmaceutical industries are facing a competitive challenge introducing novel devices for the nasal drug delivery, which is better than commercially available, unit dose and squeeze bottle sprayers. The purpose of this study is to develop such a device for the nasal drug delivery that would satisfy the needs of the patients, physicians and pharmacist. An electronically controlled multi-dose nasal drug delivery device is developed as a result of the study. The parts of the device are designed to satisfy customer needs. The developed parts are redesigned for manufacture and assembly, considering the DFMA principles. The conceptual design was tested for its functionality by developing working prototypes of using rapid prototyping techniques. Suitable materials and manufacturing processes for parts of the device are determined, and the manufacturing and assembly cost of the device is estimated to justify affordability

    The Analysis of design and manufacturing tasks using haptic and immersive VR - Some case studies

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    The use of virtual reality in interactive design and manufacture has been researched extensively but the practical application of this technology in industry is still very much in its infancy. This is surprising as one would have expected that, after some 30 years of research commercial applications of interactive design or manufacturing planning and analysis would be widespread throughout the product design domain. One of the major but less well known advantages of VR technology is that logging the user gives a great deal of rich data which can be used to automatically generate designs or manufacturing instructions, analyse design and manufacturing tasks, map engineering processes and, tentatively, acquire expert knowledge. The authors feel that the benefits of VR in these areas have not been fully disseminated to the wider industrial community and - with the advent of cheaper PC-based VR solutions - perhaps a wider appreciation of the capabilities of this type of technology may encourage companies to adopt VR solutions for some of their product design processes. With this in mind, this paper will describe in detail applications of haptics in assembly demonstrating how user task logging can lead to the analysis of design and manufacturing tasks at a level of detail not previously possible as well as giving usable engineering outputs. The haptic 3D VR study involves the use of a Phantom and 3D system to analyse and compare this technology against real-world user performance. This work demonstrates that the detailed logging of tasks in a virtual environment gives considerable potential for understanding how virtual tasks can be mapped onto their real world equivalent as well as showing how haptic process plans can be generated in a similar manner to the conduit design and assembly planning HMD VR tool reported in PART A. The paper concludes with a view as to how the authors feel that the use of VR systems in product design and manufacturing should evolve in order to enable the industrial adoption of this technology in the future

    Design for manufacturability : re-design of pencil sharpener for the ease of assembly

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    A Design For Manufacturability (DFM) approach is used to analyze the existing design of a pencil sharpener, and to reduce and re-design the parts of pencil sharpener for the ease of assembly. The procedure for the selection of a suitable and economical assembly method is based on the Boothroyd and Dewhurst methods. Analysis of the initial design for manual assembly and re-design for automatic as well as manual assembly is presented. An algorithmic approach for simplified generation of all mechanical assembly sequences and selection of the assembly sequences is presented using De Fazio and Whitney approach

    Productivity improvement for the fully automated M1218 gear assembly system.

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    Fully automated assembly systems are designed for a specific capacity, starting with the machine, the designed product and the infrastructure. The performance must be insured to fulfill the requirements for the whole system. The following thesis describes the improvement of an assembly system to fulfill requirements regarding the Overall Equipment Effectiveness (OEE). In a complex environment a good understanding of the technical background is very important. The first section of the thesis gives the technical background of the system. The improvement process is a top down process: the problem is broken down from large problems - indicated by the key performance indicators like OEE - down via Pareto analyze to root cause analysis. The most influencing factor for an inefficient performance of a product is the faulty interpretation of existing knowledge and communication problems. Finally the improvement of the situation is evaluated and changes in the structure of the company applied, to ensure a better performance right from the start for future projects

    Development of assembly and joint concepts for erectable space structures

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    The technology associated with the on-orbit assembly of tetrahedral truss platforms erected of graphite epoxy tapered columns is examined. Associated with the assembly process is the design and fabrication of nine member node joints. Two such joints demonstrating somewhat different technology were designed and fabricated. Two methods of automatic assembly using the node designs were investigated, and the time of assembly of tetrahedral truss structures up to 1 square km in size was estimated. The effect of column and node joint packaging on the Space Shuttle cargo bay is examined. A brief discussion is included of operating cost considerations and the selection of energy sources. Consideration was given to the design assembly machines from 5 m to 20 m. The smaller machines, mounted on the Space Shuttle, are deployable and restowable. They provide a means of demonstrating the capabilities of the concept and of erecting small specialized platforms on relatively short notice

    Identifying future assembly methods in Scania´s wheel axle factory

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    Development of a truss joint for robotic assembly of space structures

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    This report presents the results of a detailed study of mechanical fasteners which were designed to facilitate robotic assembly of structures. Design requirements for robotic structural assembly were developed, taking into account structural properties and overall system design, and four candidate fasteners were designed to meet them. These fasteners were built and evaluated in the laboratory, and the Hammer-Head joint was chosen as superior overall. It had a high reliability of fastening under misalignments of 2.54 mm (0.1 in) and 3 deg, the highest end fixity (2.18), the simplest end effector, an integral capture guide, good visual verification, and the lightest weight (782 g, 1.72 lb). The study found that a good design should incorporate chamfers sliding on chamfers, cylinders sliding on chamfers, and hard surface finishes on sliding surfaces. The study also comments on robot flexibility, sag, hysteresis, thermal expansion, and friction which were observed during the testing

    Hybrid Parallel Robot for the Assembling of ITER

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