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In the 21st century, the driving system of automobiles is changed gradually from internal combustion engines to electric vehicles. As for many mechanical devices are disappearing due to Electrification in the development trend of existing vehicles, but parking systems in charge of safety functions still exist. In the past, the purpose of the vehicle safety function was to operate the p-range due to the mistake of driver while driving the vehicle, but it is currently designed to safely stop the car if the motorized system is inoperable. At this time, a phenomenon called ratcheting occurs in the parking system, and the moment when the parking gear and the sprag are engaged is called a lock vehicle speed. Previous design and simulation review methods had errors in the calculation of the lock speed. To solve this problem, developing an automatic parameter calculation toolkit for locking speed in parking system, and modifying the simulation method. It was compared with test data to confirm the improvement effect of the design toolkit and analysis results.
기후변화의 영향으로 자연재해에 의한 인명 및 재산의 피해가 증가함에 따라 자연재해 취약성에 관한 연구들이 근래에 폭넓게 수행되고 있으며, 기후변화의 영향평가와 적응·방재대책 마련이 활발히 진행되고 있다. 종래의 재해영향을 평가한 연구에서는 대리변수를 이용하여 취약성 평가를 수행하였으나, 이는 정성적이고 상대적인 결과를 도출하여 절대적인 비교나 방재 또는 적응능력의 기준을 제시하기 어려운 경향이 있다. 따라서 본 연구에서는 시스템 생태학적 접근법으로 재해를 Order와 Disorder의 관계로 인식하고 에머지평가법을 이용하여 정량적인 평가를 하고자 하였다. 먼저, 2003년 부산시를 대상으로 유입 에너지와 내부 자산을 파악하였고, 태풍 매미로 인해 발생 된 태풍 에너지, 태풍 영향 그리고 복구 에너지를 분석하였다. 그 결과, 유입 에너지는 4.66E+22 sej/yr, 내부 자산은 1.98E+22 sej, 태풍 에너지는 7.80E+18 sej, 태풍 영향은 4.55E+20 sej, 복구 에너지는 3.87E+20 sej로 나타났다. 이를 통해 재해 에너지에 대한 재해 영향을 허리케인 앤드류와 비교·고찰해봤을 때, 부산시의 방재능력을 증가시킬 경우, 매미보다 큰 태풍의 에너지에 대한 영향 정도를 줄일 수 있음을 알 수 있었고 피해에 대한 실질적인 복구를 통하여 추가피해에 대한 예방이 필요함을 알 수 있었다. 따라서 본 연구는 재해에 대한 영향을 동일한 척도로 나타내어 자연환경과 인간의 경제 시스템별로 정량적이게 파악할 수 있었으며 이러한 정량적인 취약성 평가가 이루어지고 추후 태풍 크기에 따라 방재능력을 어느 정도까지 증가시키는 것이 효율적인 방재인지에 대한 추가적인 연구를 통해 도시의 방재정책마련에 기여할 수 있을 것으로 판단된다. Damage of both life and property has been increased by natural disaster under the influence of climate change, thus many natural disaster vulnerability researches have been carried out to make adaptation policy and impact assessment of climate change recently. Their method for assessing vulnerability usually have used proxy variables for making vulnerability indices. However, because their results were too qualitative and relative it tends to be hard to make absolute comparison and establish standard of prevention or adaptation ability. Accordingly, this study aimed at quantifying natural disaster vulnerability using emergy through recognizing disaster as the relations between order and disorder by system approach. As a result, ordering energy (4.66E+22 sej/yr) and ordered structure (1.98E+22 sej) of Busan in 2003 and disordering energy (7.80E+18 sej), disordered parts (4.55E+20 sej) and rebuilding energy (3.87E+20 sej) by typhoon Maemi were analysed. And then, this was compared with Hurricane Andrew in Dade County. Through this comparison, if the prevention ability of Busan increases, disordered parts can be reduced against the more powerful disordering energy. Also, prevention for additional damages by disaster is needed to practical rebuilding action. In conclusion, it was able to figure out the impact of disaster quantitatively by natural systems and urban systems showing as common measure. Based on this study and further research to make effective prevention for how much prevention ability should be increased will contribute to producing the scientific data for disaster management policy in future.
Biodiesel is already remarkable alternative fuel in many countries. So, many studies are performed on the environmental or economic effects as well as the characteristics of diesel engine fueled biodiesel in combustion and emission. In this paper, the influence of biodiesel fuel is evaluated by doing the fleet test and durability test in diesel SUVs. Vehicle fleet tests, targeted 10,000㎞ mileages, are done by general drivers who has careers above 5 years using their diesel SUVs on actual driving condition with various fueling patterns. In vehicle durability test, targeted 80,000㎞ mileages, used engines and fuel systems are inspected to evaluate the influence of biodiesel such as carbons in cylinder and corrosion in fuel tank or fuel lines. And these vehicles were checked the startability in cold condition, dynamic performance and NVH. As a result, because biodiesel fuel influenced on the performance and the noise of engines or vehicles negatively, many studies will be propel to develop the all system properly for biodiesel on diesel SUV.
The Integrated drive axle developed by Hyundai WIA Company is more competitive in cost and weight than the 3rd generation corner module. Through this, the direction for developing R&H performance was prepared in the parts of the vehicle. However, considering the development process of the Full vehicle to achieve the efficiency of test evaluation at the development stage by verifying the correlation between the test at the system level and the actual vehicle, Existing test results have the disadvantage that they cannot be used to check the contribution of system change. To compensate for this, the contribution analysis of parts of load in chassis module was analyzed and this study was conducted as a basic step for analyzing the effects of the response of unit external force and the steering performance factor.
본 연구는 자동차 전기, 전자제품 중 제어기의 무연솔더 신뢰성 시험의 전과 후 비교를 통해 신뢰성 평가를 진행했다. 무연솔더 신뢰성 시험은 차량 환경에서의 신뢰성을 확보하기 위한 시험으로 열충격, 온도변화싸이클, 임의진동 시험을 시리즈로 진행한다. 무연솔더의 열팽창 계수의 변화와 진동 환경 내구 영향을 통해 솔더의 열화 진행된 상태를 평가할 수 있다. 본 논문에서는 무연솔더 평가 중 인장, 전단 시험을 통한 접합강도율 변화와 IMC층의 두께 변화로 솔더의 열화된 상태를 확인할 수 있었다.
Hydraulic directional control valves actuated by solenoid are used to control emergency steering in general or hybrid electric commercial vehicles. In this study, a new lightweight hydraulic directional control valve was designed by flow and structural simulation, and was fabricated; the basic operation, pressure differentials, and inner leakage flow were evaluated experimentally. In the results, the new model showed comparable performance with an existing imported valve. New valve was 80% the weight of the existing valve and had few components. Installing this valve on a truck body is easier because of its compactness and small size.
The steady state and transient performance of the heavy-duty diesel engine with the WGT(WasteGate Turbocharger) was simulated using HiLS(Hardware-in-the-Loop Simulation) system. The HiLS system consists of the dynamometer model and the engine model. They are composed of mean value model which is programmed by the Matlab/Simulink. A real time simulation is possible since the operating system based on the real time is included. Therefore this HiLS system can be used for development of EMS(Engine Management System) functions.
To reduce vehicle fuel consumption due to not only driving but also air conditioning, battery-operated non-starting conditioning systems with thermoelectric modules and without mechanical elements like compressors are being manufactured for use by hybrid heavy trucks in the near future. In this study, the voltage and current consumed by a thermoelectric module were measured to determine the required battery power, and the performance of the conditioning system with air temperature, and humidity of the inlet/outlet modules and inside/outside the cabin for a truck, was evaluated using experimental apparatus under actual conditions. The results showed that, the thermoelectric module can be continously operated for about 1.5 h using existing 24 V batteries. The coefficent of performance(COP) of the cooling and heating modes was calculated to be an average 0.8-1.32. As expected, the heating performance was 30% more efficient than the cooling performance, which is general characteristic of thermoelectric modules.