Mock-up System Research Articles

The digital mock-up system to simulate and evaluate the dismantling scenarios for decommissioning of a NPP

This paper is to develop the digital mock-up system to simulate the dismantling scenarios for decommissioning of a NPP. Features of the digital mock-up system are kinematic simulation and human simulation of decommissioning scenarios of a NPP. The digital mock-up consists of major components, internals, support facilities, and equipments. The digital mock-up system could evaluate and optimize the decommissioning scenarios of a NPP.

The germicidal effects of microwave heating on microbes on evaporative humidifier elements

To identify the germicidal effects of microwave radiation for evaporative humidifiers, we measured the germicidal effects of fungal spores of Fusarium solani and vegetative cells and spores of the bacterium Bacillus subtilis using a mock-up system. The germicidal effect was compared to the output powers, irradiation times, and water contents of the element to establish effective disinfection conditions of humidifier element surfaces. The results demonstrated that the fungal and bacterial strains were inhibited at 1200 W for 20 min, except for the B. subtilis spores under the nonoperation condition involving water spray and the blower. In general, the germicidal effects appear to be stronger on the upper portion of the elements than on the lower portion. The germicidal effect was stronger at higher output power and longer exposure time under wet conditions. To achieve a uniform disinfection on the element faces, it is necessary to consider variations of these methods to produce a uniform heating pattern.

Modeling Method and Application in Digital Mockup System towards Mechanical Product

The method of modeling is the key technology for digital mockup (DMU). Based upon the developing for mechanical product DMU, the theory, method and approach for virtual environment (VE) and virtual object (VO) were studied. This paper has expounded the design goal and architecture of DMU system, analyzed the method of DMU application, and researched the general process of physics modeling and behavior modeling.

Modeling Method and Application in Digital Mockup System towards Mechanical Product

Modeling Method and Application in Digital Mockup System towards Mechanical Product

파이로 공정장치의 원격 취급성에 관한 실험적 연구

In this study, it is performed that the assessment of feasibility of developed material processing facilities using tele-operation manipulator system for the pyroprocessing. To evaluate the performance of developed facilities using tele-operation system, several performance indices are considered as remote visibility, remote reachability and remote manipulability. These are applied to RHEM (Remote Handling Evaluation Mock-up) and digital mock-up system respectively. Through this approaches, several requirements for the system improvement are deduced and preliminary inspection for real system application is fully performed. Additionally, assembly and disassembly tasks for the repair of remote handling system are also examined remotely in RHEM and evaluated those performances.

Entrepreneurship and Organizational Innovation: Principles and Practices

New structures, systems and managerial practices are parts of organizational changes. That is why we have study them in entrepreneurship. Three cases studies of internal innovations are presented: a network of small firms, a digital mock-up system and practices that mix exploration and exploitation activities. Results show the organizational effects of technological choices and the role of human capital to reconfigure the way people works.

A mounting method using a mock-up system and templates

A mounting method using a mock-up system and templates

Attitude control of a rigid body suspended by string with the use of ventilator engines

Axial motion of a balloon payload with respect to the center of mass under action of ventilator engines is studied. An implementation of a control algorithm is suggested. The possibility of using ventilator engines for trajectory tracking is examined. A technique for determining engine parameters and results of laboratory tests of a system mock-up are presented.

MOX・ウラン集合体混在模擬体系の燃料棒出力再構築解析 [3]チェッカーボード体系の解析

MOX・ウラン集合体混在模擬体系の燃料棒出力再構築解析 [3]チェッカーボード体系の解析

Applied Accurate Robotic Drilling for Aircraft Fuselage

Once limited by insufficient accuracy, the off-the-shelf industrial robot has been enhanced via the integration of secondary encoders at the output of each of its axes. This in turn with a solid mechanical platform and enhanced kinematic model enable on-part accuracies of less than +/-0.25mm. Continued development of this enabling technology has been demonstrated on representative surfaces of an aircraft fuselage. Positional accuracy and process capability was validated in multiple orientations both in upper surface (spindle down) and lower surface (spindle up) configurations. A second opposing accurate robotic drilling system and full-scale fuselage mockup were integrated to simulate doubled throughput and to demonstrate the feasibility of maintaining high on-part accuracy with a dual spindle cell.

1A2-C12 水圧マニピュレータを有する移動作業ロボットの開発

The mobile robot that has the water hydraulic manipulator for the dismantlement of the building as the base machine is developed. The paper shows the system design method and mock-up test of this robot.

Synthesis of the digital mock-up system for heterogeneous CAD assembly

Many collaborators are involved in design processes of cars, ships, aircrafts, machine tools, etc. Instead of a single CAD source, several CAD systems are used to design such complex products in the distributed design environment. There are many mismatches and interferences due to designers’ faults as well as several kinds of CAD systems. Digital mock-up (DMU) system, a tool to build a virtual mock-up in the design stage, has been used to prevent the interferences and mismatches during precision design processes. In this paper, a heterogeneous CAD assembly method to construct the DMU system is proposed through an XML and the lightweight CAD file. The XML data contain hierarchy of heterogeneous CAD assemblies. STEP PDM schema is applied to construct the XML data. The lightweight CAD file produced from a CAD file through ACIS kernel and InterOp includes not only mesh and B-Rep data, but also topological data. They are used to visualize CAD data and to verify dimensions of the parts. Developed system is executable on a desktop computer. It does not require commercial CAD systems to visualize 3D assembly data. Assembly of heterogeneous CAD models has been conducted to verify the effectiveness of the developed DMU system on the Internet.

XML-based assembly visualization for a multi-CAD digital mock-up system

Using a virtual assembly tool, engineers are able to design accurate and interference free parts without making physical mock-ups. Instead of a single CAD source, several CAD systems are used to design a complex product in a distributed design environment. In this paper, a multi-CAD assembly method is proposed through an XML and the lightweight CAD file. XML data contains a hierarchy of the multi-CAD assembly. The lightweight CAD file produced from various CAD files through the ACIS kernel and InterOp includes not only mesh and B-Rep data, but also topological data. It is used to visualize CAD data and to verify dimensions of the parts. The developed system is executed on desktop computers. It does not require commercial CAD systems to visualize 3D assembly data. Multi-CAD models have been assembled to verify the effectiveness of the developed DMU system on the Internet.

Development of a full scale remote steerable ECRH mm-wave launching system test set-up for ITER

FOM is developing a full-scale mock-up of the mm-wave upper-port launching system for electron cyclotron resonance heating in ITER. The test set-up foresees in most of the typical ITER operation conditions, e.g. primary vacuum and the secondary vacuum, blanket cooling and component cooling conditions. All relevant operational ITER conditions except neutron radiation can be simulated, including baking conditions. The fabrication of the launching system mock-up will be the last step in the development phase, which will be characterized by the fabrication of test samples and mm-wave tests and calculations. The parameterized modeling of mm-wave beam propagation in CATIA [D.M.S. Ronden, et al., Parameterized modeling of mm-wave beam propagation of the ITER ECRH remote steering upper port launcher in CATIA, this conference] (8th figure in this article) the test and calculation results will be used for the built to print design of the remote steering ECRH launcher for the ITER upper ports [A.G.A. Verhoeven, et al., Design of the Remote Steering ITER ECRH Upper Port Launcher, this conference].

XML을 이용한 이기종 CAD 조립체 DMU시스템의 설계

As many engineers and technicians are involved in the design process of large scale and/or complex products, there are a lot of miss matches and interferences due to designers’ faults and several kinds of CAD systems. Recently, CAD systems are applied to verify and check the assembly process. Digital Mock-Up(DMU) system, a tool to build a virtual mock-up in the design stage, has been used to prevent the interferences and miss matches during precision design processes. Using the virtual assembly tool, engineers are able to design precision and interference free parts without physical mock-ups. Instead of a single CAD source, several CAD systems are used to design a complex product. Several organizations are involved in the distributed design environment for heterogeneous multi-CAD assembly. XML and the lightweight CAD file are proposed for the multi-CAD assembly. XML data contains hierarchy of the heterogenenous multi-CAD assembly. STEP PDM schema and STEP ISO 10303-28 formations are applied to construct the XML data. The lightweight CAD file produced from various CAD files through ACIS kernel and InterOp not only contains mesh, B-Rep and topological data, but also is used to visualize CAD data and to verify dimensions. Developed system is executed on the desktop computers. It does not require commercial CAD systems to visualize 3D assembly data. Real-time interference and fitness checks, dimensional verification, and design and assembly verification are performed on the developed system. Assembly of heterogeneous models for a car is conducted to verify the effectiveness of the developed DMU system on the Internet.

The Application of Visualization and Simulation in a Dismantling Process

The lack of as-built drawings and information for many old nuclear facilities impedes the planning for a decommissioning. Traditional manual walkthroughs subject workers to lengthy exposure to radiological and other hazards. And also there have been a delay in the dismantling schedules and that in an increase in the amount of waste, which have caused a heavy expenditure for the decommissioning cost. In order for a 3D model to represent the real dismantling operation environment, realistic dismantling activities and scenarios were modeled. We present a dismantling digital mock-up system that can show a dismantling process through an animation and enable us to evaluate the major parameters that can directly affect the cost in a static simulation as a preview to the dismantling activities on a hypothetical dismantling environment. We carried out a prototype 3D animation and a simulation system for dismantling the thermal column in Korean Research Reactor-1(KRR-1). The results show that the modeling of a realistic scenario makes it possible to demonstrate the adequacy of the design and can provide operators with a high fidelity under the real working conditions.

A Digital Mock-up System for Construction of Product Information Model in Shipbuilding Process

As a significantly complicated manufacturing process, shipbuilding requires a sophisticated product information model to achieve the seamless flow of product information. A digital mock-up system (DMU) that builds a prototype in a computer has been proposed for consistent quality control. The DMU system can simulate models and assemblies on-the-fly as well as project real-world manufacturability without the expense and time required to make a physical mock-up. However, establishing a DMU system that can facilitate the use of product information is not easy. Preparing useful product information is costly and requires skilled computer engineers. It is thus often infeasible, especially in small and medium-sized shipyards. This paper describes the development of an affordable DMU system. Newly emerged technologies such as eXtensible Markup Language (XML), Unified Modeling Language (UML), and virtual reality (VR) are utilized to set up a practical DMU system. The DMU system developed has been applied to various commercial ships to verify its functionality and practicability.

The Application of Visualization and Simulation in a Dismantling Process

The lack of as-built drawings and information for many old nuclear facilities impedes the planning for a decommissioning. Traditional manual walkthroughs subject workers to lengthy exposure to radiological and other hazards. And also there have been a delay in the dismantling schedules and that in an increase in the amount of waste, which have caused a heavy expenditure for the decommissioning cost. In order for a 3D model to represent the real dismantling operation environment, realistic dismantling activities and scenarios were modeled. We present a dismantling digital mock-up system that can show a dismantling process through an animation and enable us to evaluate the major parameters that can directly affect the cost in a static simulation as a preview to the dismantling activities on a hypothetical dismantling environment. We carried out a prototype 3D animation and a simulation system for dismantling the thermal column in Korean Research Reactor-1(KRR-1). The results show that the modeling of a realistic scenario makes it possible to demonstrate the adequacy of the design and can provide operators with a high fidelity under the real working conditions.

Development of a digital mock-up system for selecting a decommissioning scenario

The evaluation of decommissioning scenarios is critical to the successful development and execution of a decommissioning project. In the past, many experts have used a physical mock-up system to find the exact work processes and the working positions. Nowadays, these jobs are being done by a Digital Mock-Up (DMU) system. The DMU, which is a technology to realize an effective work process by using virtual environments through representing the physical and logical schema and the behavior of a real decommissioning work, can save on the cost and time, reduce the risk of making later changes, and develop various decommissioning scenarios. In this research, a decommissioning DMU system was developed for simulating the relevant dismantling processes. Decommissioning data-computing modules which can calculate a dismantling schedule, quantify a radioactive waste, visualize a radioactive inventory, estimate a decommissioning cost, and estimate a worker’s exposure were also developed to qualitatively assess the decommissioning information. And an analytic hierarchy process (AHP) model was developed to evaluate the decommissioning scenarios which reflected the quantitative and qualitative considerations. To establish the proper scenario for the thermal column in KRR-1, the developed decommissioning DMU system was applied to evaluate the two candidate scenarios of it.

Validation of the thermal calculation method and the applicability of confinement monitoring with a full-scale mock-up test of a concrete cask

The Mitsui Engineering & Shipbuilding Co. Ltd (MES) has designed and fabricated a full-scale mock-up system that can be used to store spent nuclear fuel (SNF). The system is made up of two parts; a concrete shield that is vented and an inner steel canister that provides containment of the SNF. A benchmark analysis of this storage system was carried out using a combined thermal calculation method. Initially airflows and temperatures outside the canister were calculated using a three-dimensional thermal flow analysis method. The results from this analysis were used as the boundary conditions to calculate the maximum temperatures inside the canister using a two-dimensional heat transfer method. The calculated results agreed well with the measurements and the validity of the combined method of analysis was confirmed. Since all measured temperatures were within their acceptable limits, it was also confirmed that the concrete cask storage system has sufficient heat removal capability. MES has also proposed a new canister confinement monitoring system. It is based on the relationship between the inner pressure of the canister and the temperature of the canister lid and the pedestal. The validity and applicability of the system are confirmed by the full-scale mock-up experiment results. The conceptual design of the monitoring system is considered, and the system can realised at low cost, with high reliability and easy maintenance.