Recently, corrosion problems caused by quarantine disinfectant have occurred in the door panel of commercial trucks. As a way to solve this problem, a drain hole is being drilled in the door panel, and the door panel is being designed again for this purpose. Reinforcing parts such as frames or brackets for rigidity are attached to the inner and outer door panels, and spot welding is performed for assembly. X-rays and nugget diameter measurements of the welds were performed to confirm the results of performing according to various conditions for such spot welding. Through this study, it was confirmed that the pressing force had a greater effect on the welding quality than the amount of welding current.

Considering the difficulties of the manufacturing industry by improving production efficiency in the era of high wages and aging in domestic automation facilities, automation facilities are considered an irreversible trend, but many serious related disasters are occurring due to the problems of increasing automation facilities due to the enlargement of manufacturing processes, line-up, and automation. The purpose of this study is to review the usage conditions and safety measures for industrial robots that are experiencing serious industrial accidents and are expected to continue to increase in facilities among automation facilities at the automation industrial site and propose ways to ensure the fundamental safety of the facilities at all times The suggestions are as follows. The purpose is to prevent safety accidents in advance by applying safety door aids to industrial sites and installing additional safety devices in safety slide door lock systems applied to safety fence doors of new and already installed facilities to detach safety keys and ensure that workers carry them at all times.

The curb weight of electric trucks is more than 10% higher than that of conventional internal combustion engine trucks due to the motor and battery. For this reason, cargo box developed for small electric trucks is required weight reduction, and cargo door that can reduce weight and maintain strength are being developed. In this paper, we designed the lightweight cargo door, confirmed the stability of the door through structural analysis, and developed a cargo box door that was more than 25% lighter by applying composite materials such as Sheet Molding Compound(SMC) and Fiber Reinforced Plastic(FRP).

In this study, simulation studies were conducted to develop insert injection molds to improve the mass production of terminal assemblies. For the main part of the automobile door latch, charging, holding pressure and deformation analysis were performed according to the gate position of the injection process. As a result of injection molding analysis of the terminal assembly, the flow pattern was uniformly made while maintaining a constant balance of the filling of the product, and the pressure distribution at the time of filling was confirmed. When the analysis results are applied to the mold fabrication in the improved structural method, the transfer lines of the molten resin are controlled by the dam of the 1st injection molding, so that the transmission line is not short-circuited or deformed, and the watertightness, corrosion resistance, and good surface We believe the injection will be possible.

In this research, we evaluate on the disassemblability of recycling process for vehicle front door using the symbolic chart method and machine-learning algorithm. It is applied to the front door of 1600cc class vehicle, and then the conventional steel door and CFRP door were compared. Based on the principle symbolic chart method, the number of processes can be different according to decomposer proficiency of suitability of recycling process, so the evaluation method is required to supply this issue. The machine learning algorithm, and artificial intelligence method were applied and the applicable tools for each experiment were used to compensate the variations in the number of processes according to different proficiencies. Because CFRP front door has integrated components compare to steel door, so its disassemblability processes were decreased to 80 from 103 of the conventional steel door’s. It can be confirmed that the disassemblability was increased from the suitability of recycling equation. In case of the steel, disassemblability was approximately 60.6, in case of the CFRP is approximately 72 for car front door. Therefore, it can be concluded that the disassemblability of CFRP was better in the evaluation of suitability of recycling.

Assembly of automobile interior materials is very important for assembly and inspection such as sensitivity and noise reduction. Particularly, since assembling parts of automobile interior parts is manually assembled by a worker, a claim due to poor assembly sometimes occurs. In addition, as the labor cost rises, automobile assembly line adopts automatic assembly device as the concept of smart factory in assembly process. Therefore, in this study, we intend to develop automatic assembly device of the door trim for reducing the field claim, improving the productivity, and reducing the assembly failure.

The setting of values on door hinge mounting compensation for door assembly tolerance is a constant quality issue in vehicle production. Generally, heuristic methods are used in satisfying appropriate door gap and level difference, flushness to improve quality. However, these methods are influenced by the engineer's skills and working environment and result an increasement of development costs. In order to solve these problems, the system which suggests hinge mounting compensation value using CAE (Computer Aided Engineering) analysis is proposed in this study. A structural analysis model was constructed to predict the door gap and level difference, flushness through CAE based on CAD (Computer Aided Design) data. The deformations of 6-degrees of freedom which can occur in real vehicle doors was considered using a stiffness model which utilize an analysis model. The analysis model was verified using 3D scanning of real vehicle door hinge deformation. Then, system model which applying the structural analysis model suggested the final adjustment amount of the hinge mounting to obtain the target door gap and the level difference by inputting the measured value. The proposed system was validated using the simulation and showed a reliability in vehicle hinge mounting compensation process. This study suggests the possibility of using the CAE analysis for setting values of hinge mounting compensation in actual vehicle production.

There is a need for the development of insulation products with excellent insulation performance and durable insulation for building components. Various policies has been trying to improve the energy efficiency of buildings. The development of energy-saving building materials is also evolving as the energy saving of buildings becomes a main trend. In public and commercial buildings, reliability and beauty are emphasized with respect to the safety of buildings. The purpose of this study was to develop a manufacturing equipment and technology for the development of high airtight stainless steel insulation doors that can meet energy saving design standards of buildings.

Due to the increase of income, people has a car more than one per household. So parking space is needed to minimum size for making many parking spaces. But narrow parking space causes that interference with another car is occurred when car's door is opening or closing. So sliding door is best way for solving the problem. But sliding structure of the door is difficult to apply to all vehicle because existing sliding structure is limited. For this reason, new sliding structure of the door is needed. In this study, we suggest new sliding mechanism of front door for vehicle and confirm the sliding mechanism using a finite element analysis.

집안에는 많은 생활가구가 었다. 그중 가장 큰 부피를 차지하는 생활가구기 장롱 또는 붙박이장 이다. 본 논문에서는 장롱이냐 붙박이장으로부터 주부, 영아, 어린이들에게 발생하는 손가락 및 발가락 손상을 미연에 방지하기 위한 안전성을 확보하기 위한 기술이다 선진국에서는 가정에서 발생하기 쉬운 부분에 대하여 하이테크 기술을 접목하여 가구용 하드웨어를 개발하여 실용화를 추구하고 있으나 아직 우리나라에서는 이러한 하이테크 기술을 적용한 하드웨어 개발이 초기 상태이다. 따라서, 본 연구에서는 기존의 슬라이딩 도어의 문제점을 개선하여 신체 손상 방지 및 거실 내에서 소옴이 적은 하드웨어를 개발하여 실용화하고자 하였다.

The panels of the elevator are made of stainless steel and steel-based materials that are often used. When the elevator moves in an up and down motion, or when the door is opened or closed noise and vibration of the panel occurs. Therefore, in this study, we have studied the optimal design of the elevator car door to make the best design criteria to ensure the price competitiveness in accordance with new technical standards, by using the Catia stress analysis software, we have performed theoretical strength analysis and by carrying out test according to technical standards, we have acquired the experimental data and it has been analyzed. The results of this study are shown that the permanent deformation, the elastic deformation, and the safety performance of the car door are appropriate through the analysis of test results, and design factors meeting appraisal standards of the national technical standard have been obtained

The design flexibility and robustness have become key factors to handle various sources of uncertainties at the early phase of design. Even though designers are uncertain about which single values to specify, they usually have a preference for certain val

Smart Door(SD) is a human friendly power-assisted door system for passenger car doors. It offers comfort and safety to passengers and drivers by supplying additional power. In this study, dynamic system model and the equation of motion derivation are derived. And we propose the disturbance observer based collision detection algorithm for safety when opening the door. A disturbance caused by collision has a fast response compared to a friction, uncertainties and so on. The main idea this study is to estimate a variation of disturbance for stably and effectively detecting a collision. In order to evaluate a performance of collision detection, an experiment set up is constructed. The experimental results validate the usefulness of the proposed collision detection algorithm.

The computer-based simulation tools are currently used overwhelmingly to simulate the performance of automotive designs. Then, the search for an optimal solution that satisfies a number of performance requirements usually involves numerous iterations amon

최근 지하철 역사 내의 사고위험을 줄이기 위해 승강장에 스크린도어(PSD; Platform Screen Door)를 설치하는 사례가 늘고 있다. 일반적으로 지하철역사와 같이 폐쇄된 공간에 있어서 유동장의 해석 및 예측은 전산유체해석 (CFD: Computational Fluid Dynamics)을 주로 사용한다. 그러나, CFD는 실제로 열차가 주행할 때에 발생하는 비정상적(unsteady)인 유동장의 3차원적인 해석에는 승강장의 세부적인 형태의 모델링이 어렵기 때문에 어느 정도의 한계가 있다. 따라서, 본 연구에서는 밀폐형 스크린도어가 설치된 지하승강장을 대상으로 직통열차에 의한 스크린도어 및 승강장 천장마감재에 작용하는 풍압을 계측하였다. 계측된 풍압으로부터 스크린도어의 구조안전성을 위한 설계풍압을 결정하고, 승강장 내부의 천장마감재에 작용하는 풍압을 평가하여 승강장의 안전한 풍환경을 확보하는데 기초적인 자료를 제시하였다.