• Title/Summary/Keyword: fuel tank

Search Result 466, Processing Time 0.024 seconds

The effect on fatigue life for dynamic behavior of external fuel tank horizontal fin (외부 연료탱크 수평 핀 동적거동이 피로수명에 미치는 영향)

  • Kim, Geun-Won;Shin, Ki-Su
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.40 no.3
    • /
    • pp.209-214
    • /
    • 2012
  • Recently, there were significantly increased cracks failure for external fuel tank horizontal fin of F-5 aircraft. In this paper, the dynamic behavior of horizontal fin was to quantitate by using Finite Element Method. To achieve this goal, the fatigue analysis for time and frequeucy domain has been performed by using the dynamic load spectrum of speed brake. In conclusion, it was proved that fatigue life of the horizontal fin was reduced by the influence of dynamic behavior.

Three-Dimensional Analysis of Composite External Fuel Tank Joint (항공기용 복합재 외부연료탱크 체결부의 3차원 구조해석)

  • Uhm Won-Seop;Jung Jae Woo;Kweon Jin-Hwe;Choi Jin-Ho;Yang Seung-Un;Lee Sang-Kwan
    • Proceedings of the Korean Society For Composite Materials Conference
    • /
    • 2004.04a
    • /
    • pp.71-74
    • /
    • 2004
  • A composite-aluminum hybrid joint of composite external fuel tank of an aircraft has been analyzed by a 3-dimensional finite element method. Curvature and contact of the joint structure were considered in the analysis. Yamada-Sun failure criteria was utilized for the failure evaluation. A finite element program ABAQUS was used for the nonlinear contact analysis. The joint structure was predicted to be safe in both the test and analysis.

  • PDF

A Study on Productivity Improvement on Welding Line for Vehicle Fuel Tank using Layout Improvement (레이아웃 개선을 통한 차량용 연료탱크 용접라인의 생산성 향상에 관한 연구)

  • Yoo, Sung-Hee;Lee, Chang-Ho
    • Journal of the Korea Safety Management & Science
    • /
    • v.12 no.3
    • /
    • pp.215-221
    • /
    • 2010
  • Many researches and projects are actively implemented in the academic world and industrial world in order to increase the productivity through changing utility layout. Effective layout makes the flow of parts and products go on wheels and helps labor forces and utilities to be used efficiently. In this study, we looked at effect on utility layout change through a case of a company making a fuel tank of vehicle in Korea. Due to the layout improvement, this company could have flowshop system on welding line, so the stock in line was decreased, checking the number of stock became easier than before and it was possible to evaluate exact cycle time per unit. Through not only confirming qualitative effect, but also checking quantitative effect such as UPH(Unit per Hour), we obtained the conclusion that the layout improvement increased the productivity.

A New Manufacturing Process for the Ring Plate of Automobile Fuel Tank (자동차 연료탱크용 링 플레이트의 신 제조공법)

  • Chae, M.S.;Lim, Y.H.;Suh, Y.S.;Kim, Y.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 2008.05a
    • /
    • pp.311-315
    • /
    • 2008
  • Currently, in automobile industry. the efforts to reduce the manufacturing cost by changing the process of manufacturing are continually performed. In this paper, we proposed a new manufacturing process, the roll bending of a ring plate of automotive fuel tank instead of conventional press blanking process to reduce material loss and manufacturing cost. Finite element analysis was used to optimize the roll bending process to assure rectangular cross-section of the ring plate. Also, spring-back analysis after the roll bending was performed and dimension of the bending die considering spring-back was analyzed. Finally, we verified a possibility for realization of the proposed method shape with prototypes.

  • PDF

Application of a CNT Surface Heating Element to the Ship Equipment (탄소나노튜브 면상발열체의 선박 기자재 적용 연구)

  • Bae, Sang-Eun;Lee, Woon-Seek
    • Journal of the Korean Society of Industry Convergence
    • /
    • v.22 no.6
    • /
    • pp.673-680
    • /
    • 2019
  • This study investigates the validity of applying new carbon nanotube (CNT, Carbon Nano Tube) surface heaters, which are applied in combination with various products, to the vessel's materials, and proposes the commercializable products accordingly. In order to actually apply a CNT surface heating system technology to the ship's equipment for the first time in Korea, we carried out the interview of experts in the technology field and the due diligence of the shipyard, and presented the technology road map for the selected three items. Finally, for "Heating System of Ship Fuel Tank" with the highest commercialization potential, we proposed a conceptual diagram to enable the final development of the product through the product analysis.

Study of Failure Examples for Fuel Coagulation, Leakage, Low Grade Gasoline and Fuel Additives in Automotive Fuel System (자동차 연료 시스템에관한 연료 응고, 누설, 불량 휘발유 및 연료 첨가제에 의한 고장 사례 고찰)

  • Lee, IL Kwon;Kim, Young Gyu;Ko, Young Bae;Kim, Seung Chul
    • Tribology and Lubricants
    • /
    • v.28 no.4
    • /
    • pp.178-183
    • /
    • 2012
  • The fuel system of a vehicle is a very important compotent, as it provides the firing resources to the combustion chamber of the engine. However, improper operation of the system can generate bad condition or start-off during engine revolution. This study analyzed several examples of failure that had originated in the field. In the first example, the driver operated a vehicle containing both gasoline and LPG in the fuel tank, but the gasoline fuel remained unused for a few months. Therefore the fuel pump was clogged because of gasoline congelation. The second example, dealt with fuel leakage that occurred from the slightly torn O-ring connecting the fuel lines. The third example, pertained to engine damage and power-down owing to the usage of proor-quality fuel and ingredient. Therefore, it is necessary to take adequate measures to prevent the failure of the fuel system of vehicle.

Consideration for IMO Type C Independent Tank Rule Scantling Process and Evaluation Methods (IMO C형 독립탱크의 설계치수 계산과정 및 평가방법에 대한 고찰)

  • Heo, Kwang-hyun;Kang, Won-sik;Park, Bong-qyun
    • Special Issue of the Society of Naval Architects of Korea
    • /
    • 2017.10a
    • /
    • pp.93-104
    • /
    • 2017
  • IMO type C independent tank is one of the cargo containment system specified on IGC code. It is normally adopted for small and medium size liquefied gas carrier's cargo containment system and it can be applied to fuel tank of LNG fueled vessel. This study focuses on rule scantling process and evaluation methods in early design stage of type C independent tank. Actual design results of 22K LPG/Ammonia/VCM carrier's No.2 cargo tank are demonstrated. This paper presents the calculation methods of design acceleration and liquid height for internal design pressure as defined on IGC code. And this paper shows the applied results of classification rules about shell thickness requirement and buckling strength. Additionally this paper deals with evaluation methods of structural strength and cumulative fatigue damage using FE analysis.

  • PDF

Frequency analysis of liquid sloshing in prolate spheroidal containers and comparison with aerospace spherical and cylindrical tanks

  • Mohammad Mahdi Mohammadi;Hojat Taei;Hamid Moosazadeh;Mohammad Sadeghi
    • Advances in aircraft and spacecraft science
    • /
    • v.10 no.5
    • /
    • pp.439-455
    • /
    • 2023
  • Free surface fluid oscillation in prolate spheroidal tanks has been investigated analytically in this study. This paper aims is to investigate the sloshing frequencies in spheroidal prolate tanks and compare them with conventional cylindrical and spherical containers to select the best tank geometry for use in space launch vehicles in which the volume of fuel is very high. Based on this, the analytical method (Fourier series expansion) and potential fluid theory in the spheroidal coordinate system are used to extract and analyze the governing differential equations of motion. Then, according to different aspect ratios and other parameters such as filling levels, the fluid sloshing frequencies in the spheroidal prolate tank are determined and evaluated based on various parameters. The natural frequencies obtained for a particular tank are compared with other literature and show a good agreement with these results. In addition, spheroidal prolate tank frequencies have been compared with sloshing frequencies in cylindrical and spherical containers in different modes. Results show that when the prolate spheroidal tank is nearly full and in the worst case when the tank is half full and the free fluid surface is the highest, the prolate spheroidal natural frequencies are higher than of spherical and cylindrical tanks. Therefore, the use of spheroidal tanks in heavy space launch vehicles, in addition to the optimal use of placement space, significantly reduces the destructive effects of sloshing.

Introduction of Off-Gas Power Plant and Localization Development of Auxiliary Equipment (부생복합발전 소개와 주요설비 국산화를 위한 연구)

  • Ko, Minseok;Kim, Dohyung;Lee, Dongsu;Lee, Seong-geun
    • 한국연소학회:학술대회논문집
    • /
    • 2013.06a
    • /
    • pp.127-128
    • /
    • 2013
  • Off-gas power plant is a renewable energy power plant which generate electrical energy using the low calorie FOG and BFG as main fuel. This combined cycle power plant is comprised of gas turbines, gas compressors, steam turbines, generators, and auxiliary equipment such as gas mixer, mixing tank, and gas cooler. In this paper, a off-gas power plant and development of its several equipment using CFD are introduced.

  • PDF

EXPLOSION HAZARDS IN TANKS OF HIGH FLASH POINT LIQUIDS

  • Zalosh, Robert
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
    • /
    • 1997.11a
    • /
    • pp.203-210
    • /
    • 1997
  • Reports of explosions in cargo and storage tanks of high flash point liquids such as residual fuel oil, asphalt, and oily waste water have shown that these explosions have occurred even when the liquid temperatures are well below the liquid nominal flash point. The reasons for these seemingly paradoxical explosions are reviewed and results of recent laboratory tests are presented to better define the conditions leading to flammable vapor atmospheres in these tanks. The potential effectiveness of various prevention measures are discussed including inerting, monitoring tank vapor concentrations, and periodic cleaning of condensation and deposits on the tank walls and roof.

  • PDF