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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Computational Design and Engineering
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Society of CAD/CAM Engineers
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Volume & Issues
Volume 21, Issue 3 - Sep 2016
Volume 21, Issue 2 - Jun 2016
Volume 21, Issue 1 - Mar 2016
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A Study on BWMS Installation for a Ship without CAD Data
Jeon, Songkwun ; Choi, Young ;
Korean Journal of Computational Design and Engineering, volume 21, issue 1, 2016, Pages 1~8
DOI : 10.7315/CADCAM.2016.001
After 2017 years, BWMS units must be installed in the existing ship as well as the new ship by the ballast water management convention. Software tools that can help automatically searching for BWMS installation space to avoid pipes and equipment in the engine room of the existing ship will be very useful in the BWMS layout design. In this study, voxel representation of scanned data is generated first to search space efficiently. Simplified voxel models of each unit are prepared to be located in the engine room space as well. Distance between connected models is calculated through the arrangement direction and position of each model. Sums of distance between connected models are compared for the optimal configuration. It is assumed that the sum of distance between connected models depicts the pipe usage. The proposed method can save the time needed for BWMS installation design and allows optimal configuration of BWMS units.
A Study on Modeling Automation of Human Engineering Simulation Using Multi Kinect Depth Cameras
Jun, Chanmo ; Lee, Ju Yeon ; Noh, Sang Do ;
Korean Journal of Computational Design and Engineering, volume 21, issue 1, 2016, Pages 9~19
DOI : 10.7315/CADCAM.2016.009
Applying human engineering simulation to analyzing work capability and movements of operators during manufacturing is highly demanded. However, difficulty in modeling digital human required for simulation makes engineers to be reluctant to utilize human simulation for their tasks. This paper addresses such problem on human engineering simulation by developing the technology to automatize human modeling with multiple Kinects at different depths. The Kinects enable us to acquire the movements of digital human which are essential data for implementing human engineering simulation. In this paper, we present a system for modeling automation of digital human. Especially, the system provides a way of generating the digital model of workers` movement and position using multiple Kinects which cannot be generated by single Kinect. Lastly, we verify the effects of the developed system in terms of modeling time and accuracy by applying the system to four different scenarios. In conclusion, the proposed system makes it possible to generate the digital human model easily and reduce costs and time for human engineering simulation.
Comparative Study on the Interface and Interaction for Manipulating 3D Virtual Objects in a Virtual Reality Environment
Park, Kyeong-Beom ; Lee, Jae Yeol ;
Korean Journal of Computational Design and Engineering, volume 21, issue 1, 2016, Pages 20~30
DOI : 10.7315/CADCAM.2016.020
Recently immersive virtual reality (VR) becomes popular due to the advanced development of I/O interfaces and related SWs for effectively constructing VR environments. In particular, natural and intuitive manipulation of 3D virtual objects is still considered as one of the most important user interaction issues. This paper presents a comparative study on the manipulation and interaction of 3D virtual objects using different interfaces and interactions in three VR environments. The comparative study includes both quantitative and qualitative aspects. Three different experimental setups are 1) typical desktop-based VR using mouse and keyboard, 2) hand gesture-supported desktop VR using a Leap Motion sensor, and 3) immersive VR by wearing an HMD with hand gesture interaction using a Leap Motion sensor. In the desktop VR with hand gestures, the Leap Motion sensor is put on the desk. On the other hand, in the immersive VR, the sensor is mounted on the HMD so that the user can manipulate virtual objects in the front of the HMD. For the quantitative analysis, a task completion time and success rate were measured. Experimental tasks require complex 3D transformation such as simultaneous 3D translation and 3D rotation. For the qualitative analysis, various factors relating to user experience such as ease of use, natural interaction, and stressfulness were evaluated. The qualitative and quantitative analyses show that the immersive VR with the natural hand gesture provides more intuitive and natural interactions, supports fast and effective performance on task completion, but causes stressful condition.
Development of Pre-Specification for BIM-based Automated Building Code Checking
Kim, Inhan ; Jang, Jaemoon ; Choi, Jungsik ;
Korean Journal of Computational Design and Engineering, volume 21, issue 1, 2016, Pages 31~41
DOI : 10.7315/CADCAM.2016.031
Building Information Modeling (BIM) has been adopted in variety domain of construction industry. In this circumstances, interest of BIM model quality has been increased. In many countries, automated building code checking system by Industry Foundation Classes (IFC) has been developed and studied to use web based building permission systems. IFC is international standard of BIM format. However, the data structure of IFC does not include all of objects and properties about national building codes. In this paper, we developed the information specification between IFC data structure and national building code to increase interoperability. First, we drew the criteria from literature review to analyze the building code. And then, we analyzed building code and sorted objects and properties for automated building code checking. After that we made mapping table between the sorted data and IFC specification. Using the mapping table, we developed pre-specification about building codes information that does not exist in IFC specification. And the defined information can be used to develop the BIM modeling guide and national building permission system. The pre-specification support increasing the interoperability between user and automated building code checking system. Increasing thee interoperability makes improvement accuracy and reliability about result of automated building code checking.
A Study on Tactile and Gestural Controls of Driver Interfaces for In-Vehicle Systems
Shim, Ji-Sung ; Lee, Sang Hun ;
Korean Journal of Computational Design and Engineering, volume 21, issue 1, 2016, Pages 42~50
DOI : 10.7315/CADCAM.2016.042
Traditional tactile controls that include push buttons and rotary switches may cause significant visual and biomechanical distractions if they are located away from the driver`s line of sight and hand position, for example, on the central console. Gestural controls, as an alternative to traditional controls, are natural and can reduce visual distractions; however, their types and numbers are limited and have no feedback. To overcome the problems, a driver interface combining gestures and visual feedback with a head-up display has been proposed recently. In this paper, we investigated the effect of this type of interface in terms of driving performance measures. Human-in-the-loop experiments were conducted using a driving simulator with the traditional tactile and the new gesture-based interfaces. The experimental results showed that the new interface caused less visual distractions, better gap control between ego and target vehicles, and better recognition of road conditions comparing to the traditional one.
Arrangement Template Model for the Arrangement Optimization of Compartments and Equipment of a Submarine
Kim, Ki-Su ; Roh, Myung-Il ; Kim, Sung-Yong ; Ahn, Jin-Woo ;
Korean Journal of Computational Design and Engineering, volume 21, issue 1, 2016, Pages 51~60
DOI : 10.7315/CADCAM.2016.051
The arrangement design of a submarine has been performed based on data of parent ships and experts` experiences. To support such a task, it is necessary to accumulate and use systematically the data, and to optimize the task. The expert system for the first issue and the optimization method for the latter issue can be used. At this time, a suitable data structure to share the data on the arrangement design of the submarine should be used. In this study, the data structure named an arrangement template model (ATM) is proposed. To check the applicability of the ATM, a prototype program which consists of the expert system and the optimization method is developed. Finally, the developed program is applied to a small submarine of US Navy. As a result, it is confirmed that the ATM can be used to share the data between the expert system and the optimization method.
Using a Modular BOM for Cost Calculation in Wiring Harness
Im, Chang-Sung ; Park, Hoon ; Kang, Jung-Tae ;
Korean Journal of Computational Design and Engineering, volume 21, issue 1, 2016, Pages 61~68
DOI : 10.7315/CADCAM.2016.061
Since past till now, automotive wiring harness has been designed and produced under the method of part number list. However, the number of options has increased gradually on the basis of customer`s needs and car manufacturer`s policy, thereby bringing about an increase in the number of classified parts. Because of a large number of classified parts, cost estimates for manufacturing and production planning are more important than ever. However, the pre-existing manufacturing bill of material abbreviated as BOM is only focused on the list of materials used for actual manufacturing, and as such there have been limits to other fields or areas of usage except for manufacturing. In essence, the present paper is concerned with our study conducted on modular BOM as one of planning BOM. On such basis, we have been able to completely use a method by which to have access, make an option units` calculation in wiring harness manufacturing, and build an efficient system for cost estimates in manufacturing as well.
Estimation Model of Energy Expenditure of Working in a Clean Room for Manufacturing Embedded Needles by Ergonomic Programs
Chung, Tae-Eun ;
Korean Journal of Computational Design and Engineering, volume 21, issue 1, 2016, Pages 69~77
DOI : 10.7315/CADCAM.2016.069
The purpose of this study is to estimate the energy expenditure of working in a clean room for manufacturing embedded needles by ergonomic programs. Embedding needle is one of medical devices and it should be manufactured in a clean room. 3D static strength prediction program was used to analyze the slow movements during embedding needle manufacturing in a clean room. Also the energy expenditure prediction program was used to estimate energy expenditure rates for materials handling tasks to help assure worker safety and health in clean room. The energy expenditures of the tasks were calculated using prediction equations derived from empirical data. The energy expenditure rate of 3.09 kcal/min in a clean room didn`t exceed the 3.5 kcal/min action limit guideline for an average 8-hour day set by the National Institute for Occupational Safety and Health (NIOSH). Energy consumption was calculated on the same working conditions as EEPP program, using an average body weight of female 20 years old to 59 years who would be the candidates of the real workers.
Development of a Batch-mode-based Comparison System for 3D Piping CAD Models of Offshore Plants
Lee, Jaesun ; Kim, Byung Chul ; Cheon, Sanguk ; Cho, Mincheol ; Lee, Gwang ; Mun, Duhwan ;
Korean Journal of Computational Design and Engineering, volume 21, issue 1, 2016, Pages 78~89
DOI : 10.7315/CADCAM.2016.078
When a plant owner requests plant 3D CAD models in the format that a shipbuilding company does not use, the shipyard manually re-models plant 3D CAD models according to the owner`s requirement. Therefore, it is important to develop a technology to compare the re-modeled plant 3D CAD models with original ones and to quantitatively evaluate similarity between two models. In the previous study, we developed a graphic user interface (GUI)-based comparison system where a user evaluates similarity between original and re-modeled plant 3D CAD models for piping design at the level of unit. However, an offshore plant consists of thousands of units and thus a system which compares several plant 3D CAD models at unit-level without human intervention is necessary. For this, we developed a new batch model comparison system which automatically evaluates similarity of several unit-level plant 3D CAD models using an extensible markup language (XML) file storing file location and name data about a set of plant 3D CAD models. This paper suggests system configuration of a batch-mode-based comparison system and discusses its core functions. For the verification of the developed system, comparison experiments for offshore plant 3D piping CAD models using the system were performed. From the experiments, we confirmed that similarities for several plant 3D CAD models at unit-level were evaluated without human intervention.
Computation of Nonlinear Hydrostatic Force and Position of a Floating Structure Considering the Coupled Large Inclined Angles
Cha, Ju-Hwan ; Ku, Namkug ; Park, Kwang-Phil ;
Korean Journal of Computational Design and Engineering, volume 21, issue 1, 2016, Pages 90~98
DOI : 10.7315/CADCAM.2016.090
When ships and offshore plants are flooded or the floating crane is equipped with a heavy object, these floating structures are excessively inclined. In this case, immersion, heel, and trim affecting the hydrostatic restoration performance are very large and are coupled each other. In this paper, in order to calculate a static equilibrium position of floating structures with excessive inclination, the nonlinear governing equations were constructed by sequential linearization. In the governing equation, the immersion, heel, and trim are fully coupled, and the equations are represented using a plane area, a primary moment, and a moment of inertia of the water plane area. Therefore, it is possible to calculate the additional factor related the water plane area for estimating stability. Position and orientation of the floating structure are obtained by iterative calculation. The calculated results are compared with the previous studies in the aspect to the performance and the accuracy.