• Title/Summary/Keyword: 피로해석 시스템

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Fatigue Safe Life Analysis of Helicopter Bearingless Rotor Hub Composite Flexbeam (헬리콥터 무베어링 로터 허브 복합재 유연보 피로 안전수명 해석)

  • Kim, Taejoo;Kee, Youngjoong;Kim, Deog-Kwan;Kim, Seung-Ho
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.41 no.7
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    • pp.561-568
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    • 2013
  • After we designed Bearingless rotor hub system for 7,000lb class helicopter, flexbeam fatigue analysis was conducted for validation of requirement life time 8,000 hours. sectional structural analysis method applying elastic beam model was used. Fatigue analysis for two sections of flexbeam which were expected to weak to fatigue damage from result of static analysis was conducted. Extension, bending and torsion stiffness of flexbeam section shape was calculated using VABS for structure analysis. S-N curve of two composite material which composed flexbeam was generated using wohler equation. Load analysis of bearingless rotor system was conducted using CAMRAD II and load analysis result was applied HELIX/FELIX standard load spectrum to generate bearingless rotor system load spectrum which was used flexbeam fatigue safe life analysis.

Fatigue Safe Life Analysis of Helicopter Rotor Bearingless Hub System Composite Components (헬리콥터 로터 무베어링 허브 시스템 복합재 구성품 피로 안전수명 해석)

  • Kim, Taejoo;Kee, Youngjoong;Kim, Deog-Kwan
    • Aerospace Engineering and Technology
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    • v.13 no.1
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    • pp.10-19
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    • 2014
  • We designed bearingless rotor hub system which replace mechanical hinge/bearing with composite beam component and conducted fatigue analysis for flexbeam and torque tube. Extension/bending/torsional stiffness was calculated from 2D section analysis using VABS and 2D section structure analysis was applied for strain calculation. S-N curve of each composite material was generated using Wohler equation and fatigue analysis was conducted on weakness section which was decided from static structure analysis. CAMRAD II was used for load analysis and load analysis result was applied HELIX/FELIX standard load spectrum to generate bearingless rotor system load spectrum which was used fatigue safe life analysis.

울진 원자력 5&6호기 Motor Operated Valve의 Equalizing Bypass Pipe Line에 대한 피로수명예측

  • 이진구;황인현;이억섭
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • 2001.11a
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    • pp.219-224
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    • 2001
  • 본 연구는 울진 원자력발전소 5&6호기 Class 1680, Parallel Gate 16-inch, Motor Operated Valve (Valve ID No. SI-653 and 654)에 부착되는 Equalizing Bypass Pipe Line (EBPL)이 밸브 시스템에 발생시키는 진동하중에 의한 영향을 동적 피로안정성 관점에서 규명하기 위하여 수행된 것이다. Equalizing Bypass Line Part의 최종 설계된 형상을 Fig. 1에 나타내었다. 본 해석을 위하여 운용 중 발생되는 부착부의 잔류진동 레벨이 3축 방향 가속도로 측정되었다. 본 연구에서는 해당 시변 가속도 데이터를 바탕으로 정확한 시간-응력 이력을 얻기 위하여 시간영역에서 천이 진동해석 (Transient Vibration Analysis)을 수행하였으며, 이를 실제적인 피로해석에 활용하였다. 시간영역에서의 천이 진동해석 및 피로해석을 위해 상용유한요소 해석프로그램인 ANSYS (Version 5.6)를 활용하였다.(중략)

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Fatigue Life Prediction of Sensor Pod for Aircraft Considering Aircraft Loads (비행체 하중을 고려한 항공기용 센서 포드의 피로수명 예측)

  • Cho, Jae Myung;Jang, Joon;Choi, Woo Chun;Bae, Jong In
    • Journal of Aerospace System Engineering
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    • v.13 no.3
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    • pp.32-39
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    • 2019
  • Sensor pods mounted on the exterior of the aircraft used for tactical missions should have a fatigue life based on the expected load spectrum during operation. For mission equipment such as the sensor pod, the frequency fatigue life prediction method which applies the dynamic vibration environment condition is preferred due to the efficiency of the analysis. In this paper, a fatigue life prediction method in the frequency domain where stress due to static and dynamic loads is synthesized based on the actual flight load spectrum is proposed. After comparison with the existing analysis method, the fatigue life of the proposed analysis method was predicted conservatively. The proposed sensor pods satisfy the requirements of the fatigue life.

Development of Analysis Method and Experimental Equipment for Fatigue Durability of Automotive Wire Harness System (자동차 와이어 하네스 피로내구 해석 방법론 및 시험기기 개발)

  • Lee, Heung-Shik
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.26 no.3
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    • pp.199-205
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    • 2013
  • In this study, the methodology for the fatigue life prediction using finite element method(FEM) in wire, bundle and assembly level of the wire harness system and the development of the fatigue life test machine for the numerical analysis are investigated. To obtain stress-life(S-N) histories of the componential wires of the system, five kinds of wires are prepared and applied to the repeated bending motion using developed fatigue life test equipment. Equivalent model of the wire from the rule of mixtures theory is used for the material modeling of sheath and wire core combination. Contact conditions among the wires, taping conditions are established through the bundle level test and numerical bundle analysis. Wire and bundle level results are adopted for the assembly level analysis. For the assembly level analysis, real wire harness system including bundle and grommet is numerically modeled and applied contact condition between wires with real opening motion. The fatigue life more than 700,000 cycles of the assembly is obtained from the FEM, and it is confirmed that the result has good agreement with the experimental result.

Structural Safety Evaluation of Basic Design Model of Linear Actuator for Blade Pitch Control of eVTOL Aircraft (eVTOL 항공기 블레이드 피치 제어용 선형 구동기 기본설계 모델의 구조 안전성 평가)

  • Young-Cheol, Kim;Dong-Hyeop, Kim;Sang-Woo, Kim;Jeong-Hyun, Kang;Dohyung, Kim
    • Journal of Aerospace System Engineering
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    • v.16 no.6
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    • pp.106-113
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    • 2022
  • The structural safety of the basic design model of the linear actuator for the individual blade pitch control of eVTOL personal aircraft was investigated. Stress analysis based on the finite element method was conducted, and the margin of safety was calculated to examine the structural safety under stall load conditions. Additionally, fatigue analysis was conducted to evaluate the fatigue life of the linear actuators under operating conditions. The load history with the blade pitch angle was calculated using multi-body dynamics analysis, and the static load analysis was used to obtain the stress distribution for the rated load. As a result, it was confirmed that the safety margins exceeded zero, and the fatigue lives of all linear actuator components exceeded 107 cycles, indicating a safe structural range.

Fatigue Strength Analysis and Reliability Analysis of D/H VLCC (D/H VLCC의 피로강도해석과 피로 신뢰성해석)

  • Yang, P.D.C.;Lee, J.S.;Yoon, J.H.;Seo, Y.S.
    • Journal of the Society of Naval Architects of Korea
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    • v.34 no.2
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    • pp.64-74
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    • 1997
  • The necessity and importance of fatigue failure to variable load has been appreciated as the structural design technique develops and use of high tensile steel is increasing. This is much more appreciated for a large ship such as VLCC. The rigorous fatigue analysis and safety assessment should be, hence, carried out at the design stage to avoid the possibility of fatigue failure and to achieve the design result having a sufficient structural safety to fatigue strength. This paper deals with an efficient spectral fatigue analysis of ship structures by introducing the concept of stress influence coefficient. In the process included are probabilistic loading analysis, evaluation of long-term distribution of stress range and estimation of fatigue life applying the spectral fatigue analysis. An integrated computer program has been developed in which reliability analysis to fatigue strength is also included and has been applied to D/H VLCC.

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A Study on Fatigue Life Design for Horizontal Axis Wind Turbine Composite Blade (수평축 풍력발전 시스템용 복합재 회전날개의 피로수명 설계에 관한 연구)

  • 공창덕;방조혁;정종철;강명훈;정석훈;류지윤;김기범
    • Journal of the Korean Society of Propulsion Engineers
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    • v.3 no.3
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    • pp.47-52
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    • 1999
  • Fatigue test is an essential procedure in the dynamic structure design. It is performed to confirm that the structure should safety the required life. In this study, fatigue life for 750㎾ class horizontal axis wind turbine composite blade was investigated. Required fatigue stress was calculated by fan Bond's empirical equation and S-N linear damage method. Fatigue load for FEM analysis was calculated using load spectrum through experiments and Spera's method. Service fatigue stress was obtained by FEM with the calculated fatigue load. From comparison of the fatigue stresses, fatigue life over 20 years was confirmed.

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A Study on the Fatigue Strength and Life Distribution of Carbon Steel Using the Database System (데이터베이스 시스템을 이용한 탄소강의 피로강도 및 수명분포)

  • Kim, Jung Kyu;Moon, Joon Ho;Kim, Do Sik
    • Journal of Korean Society of Steel Construction
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    • v.10 no.1 s.34
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    • pp.37-45
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    • 1998
  • The relational database system on fatigue strength was constructed, and the properties of fatigue life distribution were examined to analyze reliability and safety of metallic materials. Data manipulations were efficiently performed in relational fatigue strength database system using dependency diagram. Regardless of the distribution of fatigue strength, the proposed method, the Robust method and the complementary error function method using probability distribution, successfully estimated parameters of the 3-parameter Weibull distribution. The proposed criterion for estimating non-failure probability showed good results regardless of censoring time. The fatigue life distribution function described as a function of parameters of the Weibull distribution and applied stress ratio produced P-S-N characteristics reasonably.

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A Study on Resonance Durability Analysis of Vehicle Suspension System (차량 현가 시스템의 공진내구해석에 대한 연구)

  • 이상범;한우섭;임홍재
    • The Journal of the Acoustical Society of Korea
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    • v.22 no.6
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    • pp.512-518
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    • 2003
  • In this paper, resonance durability analysis is performed for the fatigue life assessment considering vibration effect of a vehicle system. In the resonance durability analysis, the frequency response and the dynamic load on frequency domain are used. Multi-body dynamic analysis, finite element analysis, and fatigue life prediction method are applied for the virtual durability assessment. To obtain the frequency response and the dynamic load history, the computer simulations running over typical pothole and Belgian road are carried out by utilizing vehicle dynamic model. The durability estimations on the rear suspension system of the passenger car are performed by using the resonance durability analysis technique and compared with the quasi-static durability analysis. The study shows that the fatigue life considering resonant frequency of vehicle system can be effectively estimated in early design stage.