Browsing by Subject "Computer aided design"

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    Computer-aided design of submarine pipelines
    (1995) Gökkus Ü.
    The computerization of pipeline design is relatively important for the engineering feasibility of submarine pipelines. The changing environmental conditions make difficulties for the stability calculation of each pipe segment on line. For this reason, the computer study will provide many advantages during the design of pipeline. The different environmental and functional parameters can be easily tried on line and the most suitable size of structure against the extreme environmental conditions can be determined. This study deals with the general design principles especially including the engineering studies, i.e. wave statistical analysis, transformation of waves, stability analysis, and developed computer program to achieve both the stabilization of pipeline and aid for drawing the route together with user in some stages of the design. Finally, the outline of the program is briefly described and a flow chart is presented. © 1995, International Association on Water Quality. All rights reserved.
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    The influence of toolpath strategy on geometric accuracy in incremental forming
    (Trans Tech Publications Ltd, 2013) Malyer E.
    Incremental sheet metal forming is a new process to manufacture sheet metal parts and it is becoming a remarkable technology for fast prototyping and small lot production because of the advantages of this technology such as process flexibility, product independent tooling and higher formability. On the other hand, limited maximum drawing angle, relatively coarse surface roughness, low geometrical accuracy and long forming time are common disadvantages of the process. Furthermore, it is affected by process parameters which are tool diameter, forming velocity, spindle speed, forming geometry and depth, etc. Toolpath strategy which is used to form sheet metal by CNC machine has a key role among these parameters. The present study has been undertaken in order to investigate the suitable toolpath strategy which is developed for metal cutting by commercial CAD/CAM software to increase geometrical accuracy and decrease thinning and forming time. For the intended purpose, seven different toolpath strategies which are rough and finish strategies were used to form a truncated frustum by using one millimeter thick S235JR steel alloy. The effect of each strategy on the surface roughness, geometrical accuracy and thinning distribution of formed product was studied by measuring thickness, drawing angle and depth of formed parts. Therefore, formed parts scanned by 3D laser scanner and STL files of parts were generated then STL files were converted into CAD file. CAD data of parts was used for measurements. The measurements showed that not only forming movements but also transition movements along the tool path affected the geometric accuracy and thinning distribution, surface roughness and forming time of formed parts. On the other hand it was observed that rough strategies were given good results as finish strategies and tool paths generated by CAM software need to be editing for better geometric accuracy, thinning, forming time and surface quality. Copyright © 2013 Trans Tech Publications Ltd.
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    Comparing reflective and supportive scaffolding in 3D computer-aided design course: Engineering students' metacognitive strategies, spatial ability self-efficacy, and spatial anxiety
    (John Wiley and Sons Inc, 2022) Atman Uslu N.; Yildiz Durak H.; Gökçe Mehmet A.Y.
    Three-dimensional (3D) modeling provides a suitable context for the improvement of students' higher order thinking skills as it involves challenging and complex learning tasks. For students to succeed in difficult learning tasks, it is necessary to determine the effects of the scaffolding type given to the students in the learning process. This study asserts that reflective and supportive scaffolding has a critical effect on the dependent variables. Reflective scaffolding enables students to explain their reflective processes and clarify their reflective behavior, using personal reflection as a learning tool. Supportive scaffolding provides a process to develop knowledge and guidance on what participants should consider. This study compares the effects of different scaffolding types (reflective or supportive), students' prior knowledge on students' use of metacognitive strategies, spatial ability self-efficacy, and spatial anxiety in the 3D computer-aided design course. A pretest and posttest 2 x 2 x 2 factorial quasi-experimental model was used in the study. This study was carried out with 118 undergraduate mechanical engineering students. Analysis of covariance (ANCOVA) was used in the analysis of the data. The results showed that the supportive scaffolding group scored higher in the metacognitive strategies variable than the reflective scaffolding group. The supportive scaffolding group showed higher spatial ability than the reflective scaffolding group. This study provides engineering educators with an overview of the use of scaffolding types, their effects on the effectiveness of learning environments, and the design of these environments. © 2022 Wiley Periodicals LLC.