• 제목/요약/키워드: Technology Residual Life Analysis

검색결과 71건 처리시간 0.024초

특허인용 수명분석을 이용한 기술의 경제적 수명 추정에 대한 연구 (A Study on the Estimation of Technology Economic Life Using Patent Citation Life Analysis)

  • 성웅현;유선희
    • 지식경영연구
    • /
    • 제8권1호
    • /
    • pp.49-63
    • /
    • 2007
  • This paper presents a new methodology that allows the influence of technological obsolescence and technology composite competitiveness to estimate technology economic life. In this paper the patent citation life analysis is used to estimate technology representative life, and technology residual life analysis is employed to estimate residual life using the linear and inverse functions. The technology economic life will be determined by combining the estimation results of patent citation life analysis and technology residual life analysis. This paper includes an example of applying it to the US patent data for 5 communications areas. Therefore, this logical concept can be applied usefully to determine the technology economic life and be expected to contribute to obtain credibility of technology valuation.

  • PDF

축대칭 형상 자유단조품의 잔류응력 형성에 대한 유한요소해석 (Analysis of Residual Stress Development in Open-Die Forged Axisymmetric Parts Using FEM)

  • 방원규;정재영;장영원
    • 한국소성가공학회:학술대회논문집
    • /
    • 한국소성가공학회 2001년도 추계학술대회 논문집
    • /
    • pp.233-235
    • /
    • 2001
  • Residual stress in the forged parts affects the resistance to mechanical failure, dimensional uniformity, and the service life of the parts. In order to elucidate the development of residual stress in open-die forging process, elasto-plastic finite element analysis was implemented to radial forging process. Super duplex stainless steel SAF 2507 was selected as workpiece material and a series of mechanical tests followed by numerical compensation to deformation heating was conducted to obtain necessary flow data. The residual stress distributions were calculated using commercial 3-D FEM code and the effects of process design were evaluated from selected results.

  • PDF

Fatigue performance assessment of welded joints using the infrared thermography

  • Fan, J.L.;Guo, X.L.;Wu, C.W.
    • Structural Engineering and Mechanics
    • /
    • 제44권4호
    • /
    • pp.417-429
    • /
    • 2012
  • Taking the superficial temperature increment as the major fatigue damage indicator, the infrared thermography was used to predict fatigue parameters (fatigue strength and S-N curve) of welded joints subjected to fatigue loading with a high mean stress, showing good predictions. The fatigue damage status, related to safety evaluation, was tightly correlated with the temperature field evolution of the hot-spot zone on the specimen surface. An energetic damage model, based on the energy accumulation, was developed to evaluate the residual fatigue life of the welded specimens undergoing cyclic loading, and a good agreement was presented. It is concluded that the infrared thermography can not only well predict the fatigue behavior of welded joints, but also can play an important role in health detection of structures subjected to mechanical loading.

일부 노인의 구강내 상태에 따른 구강건강관련 삶의질 차이에 관한 연구 (The oral status of the elderly in some states difference between oral health-related quality of life)

  • 박종희
    • 대한치과기공학회지
    • /
    • 제36권1호
    • /
    • pp.51-62
    • /
    • 2014
  • Purpose: Recently our country is rapidly aging population is growing. In the oral cavity of the elderly status of oral health-related quality of life to evaluate any impact. Methods: The survey used structured self administered questionnaires from April to May in 2011 in Daejeon and Chungcheong provinces to 277 people, analysis of the general characteristics of a frequency analysis method, the difference between the quality of life T/F test, whether oral self-according to the quality of life healthy oral health effects of the multiple regression analysis. Results: Award comes on the number of residual value, lower age all the more, smaller monthly income was small, but significant difference between them was no difference between gender. Residual value according to the number of differences in the quality of life of physical pain upper, physical disability, the lower the physical pain, physical disability, psychological disability were significant differences in degradation. Depending on oral maxillary prosthesis fitted to physical pain, psychological discomfort, physical disability, the lower the functional limitation, physical pain, there was a significant difference in physical disability. Conclusion: Status of the oral cavity of the elderly factors affecting the quality of life remaining in the lower dimensions, upper and lower prosthetics, self-aware state of oral health in order to improve the quality of life of elderly oral health education to be strengthened to increase the residual value, reducing their own prosthetic perceived oral health is health, so they feel it should be for the development of health education programs for the elderly should be.

대공간 화재시 배연효율 정의에 관한 수치해석적 연구 (Numerical Study on the Definition of the Exhaust Effectiveness of Smoke under Fire in a Large Space)

  • 김정엽;장경진;한화택
    • 설비공학논문집
    • /
    • 제26권11호
    • /
    • pp.535-540
    • /
    • 2014
  • This paper investigates the exhaust effectiveness of smoke, in the case of fire in a large atrium space. Numerical analysis was conducted to simulate transient fire growth in a test room, modeled by the Murcia atrium fire test. Various indices representing the exhaust performance of the exhaust system were obtained, such as the height of the smoke layer, and the instantaneous and accumulative capture efficiency of the smoke. The residual life time of smoke from the fire was also obtained, by injecting tracer gases at the fire location, depending on the airflow rate, and the location of the exhausts. The capture efficiency based on smoke concentration at the exhausts exhibits how much smoke can be removed by the exhaust system; whereas, the exhaust effectiveness based on residual life time indicates how rapidly the smoke can reach the exhaust locations, before being exhausted. The definitions and meanings of the indices to be used in representing the exhaust performance of a smoke exhaust system installed in a large space are discussed.

이종해석 연계 기법을 통한 주조 잔류응력이 내구성에 미치는 영향 분석 (Analysis of the Effect of Casting Residual Stress on Durability by a Combination of Different Numerical Methods)

  • 천진호;박용호;박익민
    • 대한금속재료학회지
    • /
    • 제49권6호
    • /
    • pp.468-473
    • /
    • 2011
  • Determining the residual stress during casting processes is important for evaluating the mechanical properties and strength of materials and to optimize manufacturing conditions. In this study, we propose a field data interface procedure between FDM and FEM in a 3-dimensional space for analyzing the casting process and structural analysis. The casting process was analyzed using FDM and the data of the temperature distribution were converted into a format suitable for FEM analysis to calculate the thermal stress and safety factor by tightening force. The results of the coupled analysis between FDM and FEM showed that casting residual stress is an important factor in predicting life time and evaluating durability.

토양 중 제초제 Ethalfluralin의 잔류 농도와 반감기 분석 (Analysis of Half-life Time and Residual Concentration of Ethalfluralin Herbicide in Soils)

  • 한성수;임요섭;김일광
    • 분석과학
    • /
    • 제10권3호
    • /
    • pp.168-178
    • /
    • 1997
  • 기체 크로마토그래피법을 이용하여 제초제인 ethalfluralin의 잔류분석을 위한 최적 측정 조건을 구하고, 토양에서의 잔류량과 반감기를 조사하였다. 토양시료를 methanol과 dichloromethane으로 추출하여 농축하였다. Toluene으로 다시 녹이고, cyanosilica gel 카트리지로 분리하여 전자포착형 검출기가 장착된 기체 크로마토그래프(GC-ECD)로 분석하였다. 0.1과 1.0ppm의 표준물을 첨가하였을 때, 92.8~101.2%의 회수율을 얻었으며, 검출한계는 0.004ppm이었다. Ethalfluraline의 반감기는 토양 (A)의 경우에는 실내에서 35일, 야외에서 7.2일이었으며, 토양 (B)의 경우에는 실내에서 45일, 야외에서 9.7일이었다.

  • PDF

Fatigue Life Evaluation of Welded Joints by a Strain-life Approach Using Hardness and Tensile Strength

  • Goo Byeong-Choon;Yang Seung-Yong
    • Journal of Mechanical Science and Technology
    • /
    • 제20권1호
    • /
    • pp.42-50
    • /
    • 2006
  • To evaluate the fatigue lifetime of structures, it is necessary to identify the values of parameters through tests. From the viewpoint of time and cost it is difficult for engineers to get the necessary data through tests. In this study, we surveyed literature and proposed a procedure to identify the fatigue parameters expressed with the Brinell hardness and elastic modulus. After obtaining stress concentration factors by finite element analysis, we calculated fatigue notch factors using Peterson's formula. Taking into account the welding residual stress, which was also obtained by finite element analysis, we evaluated the fatigue lifetime of four kinds of welded joints using the proposed approach. The estimated results are in a good agreement with the experimental results.

알루미늄 합금 용접부의 피로균열성장거동에 관한 파괴력학적 연구 (A Fracture Mechanics Study on the Fatigue Crack Growth Behaviors in Aluminum Alloy Weldments)

  • 차용훈
    • 한국생산제조학회지
    • /
    • 제5권3호
    • /
    • pp.31-39
    • /
    • 1996
  • The objective of this study is to investigate the influence of welding residual stresses on the fatigue crack growth behavior of cracks located transverse to the weld bead. For this purpose, G. T. A (Gas Tungsten Arc) welding was performed on hte Al alloy 1100-O plate and the same initial crack is made on HAZ(Heat Affected Zone), weld metal and base meta respectively. Specimens were used CT(Compact Tension) specimens. Initial welding residual stresses were measured by using strai gage sectioning method. All specimens were tested under constant amplitude load with stress ratio R=0.1, It is possible to predict fatigue crack growth behaviors and the fatigue life, using numerical analysis together with distribution of initial residual stress and the values of C and m obtained from $da/dN-{\Delta}K$

  • PDF

웨이퍼 이송 로봇의 잔류진동 저감을 위한 입력성형 기법의 적용 (Application of an Input Shaping Method for Reduction of Residual Vibration in the Wafer Positioning Robot)

  • 안태길;임재철;김성근;김국원
    • 반도체디스플레이기술학회지
    • /
    • 제11권2호
    • /
    • pp.33-38
    • /
    • 2012
  • The wafer positioning robot in the semiconductor industry is required to operate at high speed for the improvement of productivity. The residual vibration caused by the high speed of the wafer positioning robot, however, makes the life of the robot shorter and the cycle time longer. In this study, the input shaping and the path of the system are designed for the reduction of the residual vibration and the improvement of the cycle time. The followings are the process for the reduction and the improvement; 1) System modeling of the wafer positioning robot, 2) Verification of dynamic characteristics of the wafer positioning robot, 3) Input shaping plan using impulse response reiteration, 4) Simulation test using SIMULINK program, 5) Analysis of result.