The Development of a Technological Processor as a Part of a Workpiece Programming System

The cost of turning on NC-lathes is substantially sensative to cutting conditions. The use of optimum cutting conditions is limited by a large number of constraining factors such as chip disposal, chucking possibility, available power, required accuracy etc. The present way of work preparation, even when using the available workpiece programming systems, does hardly allow of generating acceptable values for the cutting variables. Moreover, the combination of geometrical and a technological processor in one workpiece programming system will save substantial time in work preparation.\ud Starting from a former reported development, this article deals with the development of a technological processor of improved design and extended possibilities, as for instance the handling of the chucking problem, as a part of a complete workpiece programming system. At choice the output of this processor may be presented in graphes, showing the limited working area and indicating the preferential working point.\ud Another feature is the possibility of automatic tool selection by comparing the working area of the machine tool with the working areas of the different potential tools.\ud The overall system design is modular and well structured to further portability and flexibility

Strategy in Generative Planning of Turning Processes

This paper reports on the process and operations planning system ROUND and the strategies which underlie the decision making processes in the planning of turning operations. At first, an outline is given about the environment for which generative systems like ROUND are being developed. The differences between high volume production and job shop production, with respect to flexibility and productivity, are designated. The impact of automation on job shop production and its consequences for process and operations planning are discussed. In small batch manufacturing systems, relatively large amounts of process planning data have to be processed, which leads to an increasing interest for sophisticated computer aided process planning tools. Because available NC part programming systems usually do not support the generation of reliable and economic technological data, it is necessary to develop generative process and operation planning systems. Due to the relative complexity of the technological models, generative systems use a lot of computing power. Reduction of possible variants, combined with model refinement are techniques which are used in ROUND, in order to avoid excessive iteration. This is illustrated by the explanation of strategies which are implemented in two newly developed modules: The clamping module RNDFIX and the module for selection of tools for the roughing operation RNDRTL

Review of research in feature-based design

Research in feature-based design is reviewed. Feature-based design is regarded as a key factor towards CAD/CAPP integration from a process planning point of view. From a design point of view, feature-based design offers possibilities for supporting the design process better than current CAD systems do. The evolution of feature definitions is briefly discussed. Features and their role in the design process and as representatives of design-objects and design-object knowledge are discussed. The main research issues related to feature-based design are outlined. These are: feature representation, features and tolerances, feature validation, multiple viewpoints towards features, features and standardization, and features and languages. An overview of some academic feature-based design systems is provided. Future research issues in feature-based design are outlined. The conclusion is that feature-based design is still in its infancy, and that more research is needed for a better support of the design process and better integration with manufacturing, although major advances have already been made

Design and evaluation of a virtual gearshift application

When a customer buys a new car, he or she wants it to address personal preferences with respect to its driving behavior. By utilizing virtual reality technology, a virtual prototyping environment (VPE) can be created in which the behavior of a vehicle or part of a vehicle can be evaluated and adjusted to match the driver's desires. This paper describes the design and the evaluation of a VPE for manually operated gearboxes. The test group considered the simulated "virtual" gearshift feel to be quite similar to the "real" gearshift feel of a test vehicle. By further developing this VPE, it should become possible to define gearshift feel by customer assessment through haptic simulation, after which the physical gearbox is designed in such a way that it matches the preferred shifting behavior

'Create the future': an environment for excellence in teaching future-oriented Industrial Design Engineering

In 2001, the University of Twente started a new course on Industrial Design Engineering. This paper describes the insights that have been employed in developing the curriculum, and in developing the environment in which the educational activities are facilitated. The University of Twente has a broad experience with project-oriented education [1], and because one of the goals of the curriculum is to get the students acquainted with working methods as employed in e.g. design bureaus, this project-oriented approach has been used as the basis for the new course. In everyday practice, this implies a number of prerequisites to be imposed on the learning environment: instead of focusing on the sheer transfer of information, this environment must allow the students to imbibe the knowledge and competences that make them better designers. Consequently, a much more flexible environment has to be created, in which working as a team becomes habitual, and where cutting-edge technologies are available to facilitate the process. This can be realized because every student owns a laptop, with all relevant software and a full-grown course management system within reach. Moreover, the learning environment provides the fastest possible wireless network and Internet access available [2]. This obviously has its repercussions on the way the education is organized. On the one hand, e.g. virtual reality tools, CAD software and 3D printing are addressed in the curriculum, whereas on the other hand more traditional techniques (like sketching and model making) are conveyed explicitly as well. Together with a sound footing in basic disciplines ranging from mathematics to design history, this course offers the students a profound education in Industrial Design Engineering. The paper describes in more detail the curriculum and the education environment, based on which it is assessed if the course on Industrial Design Engineering can live up to its motto: ‘Create the future’, and what can be done to further enable the students to acquire the full denotation of that motto

Research and Development of Immersive Computational Thinking Tools using Virtual Reality, Natural Hazards Data, and Scientific Visualization to Engage K-12 Students in Scientific Computing and Engineering Education

The NHERI DesignSafe-CI Research Experience for Teachers (RET) supplement recruits two high school teachers to work alongside faculty, researchers, and staff of the Texas Advanced Computing Center (TACC) at The University of Texas at Austin. Teachers participate in graduate-level research within the fields of computing and engineering with a particular emphasis on the intersection of natural hazards data, virtual reality, and scientific visualization. The research focus in 2019 was the use of NHERI data, A Frame and WebVR framework, and TACC visualization resources to create natural hazards design features in a virtual reality environment. Professional development and training from TACC supported research deliverables, including a lesson plan aligned with Texas Essential Knowledge and Skills (TEKS) state standards, and a live demo to support TACC's education and outreach activities for K-12 and the general public. This poster will present the research process, highlighting TACC resources used, challenges and successes, and dissemination efforts.Texas Advanced Computing Center (TACC

Modeling the Structure and Complexity of Engineering Routine Design Problems

This paper proposes a model to structure routine design problems as well as a model of its design complexity. The idea is that having a proper model of the structure of such problems enables understanding its complexity, and likewise, a proper understanding of its complexity enables the development of systematic approaches to solve them. The end goal is to develop computer systems capable of taking over routine design tasks based on generic and systematic solving approaches. It is proposed to structure routine design in three main states: problem class, problem instance, and problem solution. Design complexity is related to the degree of uncertainty in knowing how to move a design problem from one state to another. Axiomatic Design Theory is used as reference for understanding complexity in routine design

The relationship between incontinence, toileting skills, and morbidity in nursing homes

Ribbe, M.W. [Promotor]Achterberg, W.P. [Copromotor]Dik, M.G. [Copromotor