• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2006년도 제27회 추계학술대회논문집
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• pp.54-58
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• 2006

우주 시스템에 사용되는 각종 추진제 탱크는 내 외부압력 및 온도, 무게 등의 조건을 고려하여 설계되어야 한다. 특히 탱크의 외부 조건에 의해 탱크에 발생 또는 전달되는 정적, 동적 하중조건을 충분히 지지할 수 있도록 설계 고려하는 것이 탱크 설계의 주요한 인자 중 하나라고 할 수 있다. 이와 같이 탱크를 지지하는 것을 탱크 마운팅(tank mounting)이라고 한다. 탱크 마운팅을 위해서는 견고한 구조와 함께 간단한 제작성, 가벼운 무게, 저렴한 제작비 등을 고려하여야 한다. 본 논문에서는 추진제 탱크 마운팅 방법의 종류 및 특징에 대해 언급하고, 해외 우주관련 프로그램에 적용된 마운팅 방법에 대해 소개하도록 한다.

• 한국기계가공학회지
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• 제15권6호
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• pp.24-34
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• 2016

To attach a fuel tank to an excavator, two sets of mounting plates on which three bosses are attached are welded onto the tank. In this study, the welding process of a fuel tank for an excavator was modeled using a finite element numerical method. The tank was modeled as a simple plate to which the mounting plate or bosses were attached by fillet welding. Thermal and thermo-elasto-plastic analyses of the welding process were carried out to predict the temperature distribution and material distortion during welding, respectively. Three different welding sequences for the tank were also modelled to compare the deformation that occurred due to each welding sequence. The results of the analysis predicted that changing the welding sequence around the mounting plate could not position the boss within the allowable dimensional range. The results also revealed the sequence in which the maximum distortion of the bosses welded onto the tank was 30% less than the maximum distortion due to the other sequences.

• 시스템엔지니어링워크숍
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• 통권6호
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• pp.134-137
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• 2005

• 한국인터넷방송통신학회논문지
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• 제14권2호
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• pp.127-134
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• 2014

본 논문은 방향탐지용 Low-VHF 대역 소형 안테나의 탱크 장착 위치에 따른 방사특성에 관한 연구이다. 먼저, 안테나를 평면 접지면상 장착시, 다음으로 탱크 위 장착시 방사특성에 대하여 각각 시뮬레이션(40MHz)과 1/10 축소된 모델에 대하여 제작 측정(400MHz)으로 확인하였다. 평면 접지면상 장착시 급전점이 ${\phi}=0^{\circ}$, $180^{\circ}$(xz-면)에 위치할 경우, yz-면 성분(H-면)과 xz-면 $E_{\theta}$ 성분(E-면) 방사패턴이 좁은 접지면의 영향으로 상반구상 무지향성 방사 특성을 유지함을 확인 하였다. 다음으로 탱크 장착시에도 평면 접지면상 장착시 방사특성과 동일하게 상반구상에서 yz-면 $E_{\phi}$ 성분(H-면)과 xz-면 $E_{\theta}$ 성분(E-면) 방사패턴 모두 장착위치에 거의 영향이 없는 상반구상 무지향성 방사 특성을 나타내었다. 이로써, 제안된 방향탐지용 소형 안테나를 탱크에 장착 할 경우, 급전점을 접지면이 좁은 xz-면(E-면)에 위치시킨다면, 방향탐지용 안테나로써 보다 안정적인 방사특성을 유지함을 확인 할 수 있었다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2008년도 추계학술대회논문집
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• pp.282-283
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• 2008

According to the development of vehicle technique, the improved NVH performance is required in the vehicle which have the high effectiveness and the high output of the powertrain. This vehicle has to be adapted to active engine mounting system to reduce the vibration in accordance with various vehicle information. The pneumatic active engine mounting system is consist with engine mount, solenoid valve, air tank and control unit totally. The important technique of this system is to reduce the vibration by the air pressure. This paper contains the development process of the pneumatic active engine mounting system and confirm the performance of this system test and vehicle test.

• 대한토목학회논문집
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• 제13권4호
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• pp.51-64
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• 1993

본 연구에서는 원통형 액체저장탱크(cylindrical liquid storage tank)를 대상으로 적층(積層)고무받침(LRB)방식의 기초분리장치(base isolator)를 사용하였을 때의 진동감소효과를 분석하기 위하여 지진하중에 대한 유사동적실험(Pseudo-dynamic test)을 수행하였다. 유사동적실험을 효과적으로 수행하기 위하여 구조분할기법(substructuring technique)을 도입하여 액체저장탱크를 수치적으로 모형화하였으며 효율적인 수치적분방법을 실험알고리즘에 적용하였다.

• 산업경영시스템학회지
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• 제42권3호
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• pp.89-94
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• 2019

K1A1 tank commander's primary thermal sight is a device that enables tank commanders to detect, identify, aim and track the target by observing targets in all directions during day, night and in situations of smokescreen and fog through $360^{\circ}$ rotation independent from the gunner's primary thermal sight and stabilizing the line of sight even under the vibrations occurring when the tank is standstill and moving. The main function of this device is to detect and process visible and thermal images and deliver the final images to the tank commander. One of the core parts to that end is the observation window (daytime/thermal image window). This core part is mounted at the entrance of the optical path for observing the target and plays the role of making visible light during the daytime and infrared light during the night pass through the target and transmitting the resultant images to the internal optical system of the tank commander's primary thermal sight. Such core parts have been selected as depot maintenance items so that they are replaced by new parts instead of being recycled when they are subjected to maintenance in most cases. That is, the military budget is wasted because such parts are replaced by new parts despite that they can be recycled for maintenance. Therefore, this study proposed a mounting tool for polishing and coating observation windows (daytime and thermal image window) using planar polishing equipment and DLC (Diamond-Like Carbon) coating equipment. In addition, this study presented an amendment (proposal) of the Depot Maintenance Work Request (DMWR) already published to verify the performance of recycled products including the establishment of inspection standards for recycling processes.

• 자동차안전학회지
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• 제13권4호
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• pp.92-98
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• 2021

Recently hydrogen fuel cell buses have been deployed for the public transportations. In order to introduce buses fueled by hydrogen successfully, the research results of hydrogen bus safety should be discussed and investigated significantly. Especially, Korean government drives research in terms of various applications of hydrogen energy to replace the conventional fuel energy resources and to improve the safety evaluation. Thus it is necessary to examine vehicle crashworthiness under side impact loadings. This study was focused on the simulation result evaluation of full bus model and simplified bus model with hydrogen fuel tank module and mounting system located below floor structure due to the significance of bus side impact accidents. The finite element models of hydrogen bus, fuel tank system and side impact moving barrier were set up and simulation results reported model performance and result comparison of two side impact models. Computational results and research discussion showed the conceptual side impact framework to evaluate hydrogen bus crashworthiness.

• 한국기계가공학회지
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• 제20권5호
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• pp.17-26
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• 2021

It is challenging to estimate the fatigue life of construction equipment consisting of a welded joint using field structure test owing to the uncertainty of the S-N curve. IIW recommends different S-N curves for various welded joint types. However, there is no way to define an appropriate curve considering complex design shape and strain gauge characteristics. This paper proposes an equivalent S-N curve method based on the relationship between IIW effective notch stress and virtual stress using finite element analysis. Moreover, a case study was conducted for the excavator fuel tank. The proposed method is expected to enhance accuracy and consistency in calculating the fatigue life for the welded structure of construction equipment.

• 한국항공우주학회지
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• 제31권2호
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• pp.89-95
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• 2003

현재 개발중인 인공위성의 추진시스템은 크게 추진제 탱크 및 4개의 주요모듈로 구성되어 있다. 각 주요 모듈은 위성체 자세제어에 필요한 펄스 모멘텀, 추진제와 가압제의 공급/배출, 추진제 여과, 그리고 위성체 비상상태에서늬 유로변경 기능 들을 각각 제공한다. 이러한 주요 모듈들은 각각의 지지용 브라켓에 의해 추진시스템의 플랫폼에 장착되는데 모든 발사 환경 및 궤도상에서 주요 모듈들이 정상적으로 작동할 수 있도록 각 브라켓의 설계가 적절하게 이루어져야 한다. 본 논문에서는 주요 모듈의 지지용 브라켓들에 대해 유한요소해석(FEM)을 이용한 구조해석을 수행함으로써 규정된 설계 요구조건을 만족하는지 확인하였고 이를 통해 브라켓들의 구조적 안전성을 검증하였다.