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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

A study of the relationship between engineering design and measurement technology

Saunders, Per January 2015 (has links)
Engineering design and dimensional measurement tend to occur at opposite ends of the product creation process. As a result, the dialogue may sometimes be poor, and can lead to the production of features that are difficult to measure, adding unnecessary cost and risk to the business. In response, the EngD research aims to identify ways in which the relationship between these activities can be strengthened. An emphasis was placed on product lifecycle management (PLM), due to the sponsor’s desire to maximise the value of their existing investments in this area. Since the problem is complex, and seemingly intractable, a mixed methods approach was adopted in which laboratory experiments were interwoven with small-scale interventions within industry. The research began with the development of a theoretical framework, labelled ‘PLM-integrated dimensional measurement’ (PiDM). The framework builds on existing literature, whilst incorporating issues identified by stakeholders. Test cases were structured and executed against the framework in order to identify technology gaps; key amongst which was the need to improve measurement planning for coordinate measuring machines by incorporating uncertainty evaluation techniques. Four interconnected investigations were then carried out in an industrial setting to explore measurement capability in practice. The findings from these investigations informed subsequent development of an uncertainty-based measurement planning system. The system brings together commercially available simulation software and measurement programming software into a PLM environment. It allows features to be categorised according to their ‘measurability’, providing quantitative data for verification planning and engineering design. The EngD concludes with an industrial case study, investigating potential routes to deployment. This case study provided the data needed to commission a further two year programme of research into the topic, formally engaging the sponsor organisation’s strategic metrology and PLM solution providers. This new research programme is structured around the PiDM framework.
2

Die-Level Interfacial Bonding Strength and Fracture Toughness

Chen, Chi-ming 06 August 2004 (has links)
It is an important topic for electronic packages to estimate the interfacial bonding strength between dissimilar materials. If it is not strong enough, delamination would arise easily under high temperature, vibration or collision. Its reliability will be reduced. The study on interfacial fracture behavior between epoxy resin and die based on experimental and numerical analyses is investigated, and it is useful to judge where the delamination happens . In terms of interfacial fracture mechanics, the critical strain energy release rate (G ) of crack tip is related to the phase angle (£r ) . Considering the interface of the epoxy /die existing a tiny crack, the compact mixed mode (CMM) fixture is used to decide the critical load . Finally , we adopt the finite element method to calculate that the critical strain energy release rate (G ) and the phase angle (£r ) in comparison with empirical results .
3

Development of a VR – based CMM system for industry training and CMM path planning

Zhao, Long 28 September 2012 (has links)
This research proposes a VR - based CMM operation system combined with the path planning algorithm to effectively shorten the inspection time. The virtual CMM system is also a good educational tool for industries to train new employees. The realistic interface of virtual CMM environment allows users to practise the CMM operation process before operating the real CMM. The system is also useful to reduce the collision possibility by verifying the collision-free path for products inspection. This system uses Eon Studio as the simulation tool to build the virtual environment of CMM operations. Collision detection is implemented in Eon studio by using built-in functions and VB script programming. A new algorithm combines the integer programming model. A big penalty M method is proposed to avoid unnecessary collisions. The simulation and optimization results prove that the proposed algorithm can effectively reduce the total probe travelling distance with improved inspection efficiency.
4

Development of a VR – based CMM system for industry training and CMM path planning

Zhao, Long 28 September 2012 (has links)
This research proposes a VR - based CMM operation system combined with the path planning algorithm to effectively shorten the inspection time. The virtual CMM system is also a good educational tool for industries to train new employees. The realistic interface of virtual CMM environment allows users to practise the CMM operation process before operating the real CMM. The system is also useful to reduce the collision possibility by verifying the collision-free path for products inspection. This system uses Eon Studio as the simulation tool to build the virtual environment of CMM operations. Collision detection is implemented in Eon studio by using built-in functions and VB script programming. A new algorithm combines the integer programming model. A big penalty M method is proposed to avoid unnecessary collisions. The simulation and optimization results prove that the proposed algorithm can effectively reduce the total probe travelling distance with improved inspection efficiency.
5

Förbättra processen vid småskalig systemutveckling : en fallstudie

Johansson, Åke, Jonasson, Lennart January 2003 (has links)
No description available.
6

Förbättra processen vid småskalig systemutveckling : en fallstudie

Johansson, Åke, Jonasson, Lennart January 2003 (has links)
No description available.
7

Development of a novel optical contact probing system for nano-CMM

Ji, Hong January 2008 (has links)
This thesis describes the development and the verification of a novel micro probe system for high accurancy downscaled Coordinate Measuring Machines (CMMs).
8

Mathematical modelling of the parameters and errors of a contact probe system and its application to the computer simulation of coordinate measuring machines

Baird, Patrick James Samuel January 1996 (has links)
No description available.
9

Research on Taiwan's Software Industry and Its adoption of CMM Model

Lin, Jen-Chuan 29 July 2002 (has links)
Abstract Ever since the early 90¡¦s the global software market has been growing at a rapid speed, even faster than that of the hardware market. Along with the development of Internet and e-commerce, the demands for software have been continuously on the rise. The Taiwan software industry has to improve the quality of its software products in order to compete in the international IT arena. The present best option is for the Taiwanese software firms to achieve the Software Engineering Institute¡¦s Capability Maturity Model certification. This study shows that the obstacles Taiwanese software firms in adopting Capability Maturity Model can be categorized into three main factors: human resources, environment, and technology. Therefore, the software industry must start solving these issues to improve quality and Subsequently attain international standard.
10

Metrikeinsatz in Software-Projekten

Fink, Miriam. January 2005 (has links)
Stuttgart, Univ., Diplomarb., 2005.

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