• 제목/요약/키워드: Accelerated vibration testing

검색결과 9건 처리시간 0.028초

점용접 표준시편에 대한 가속내구시험법의 적용 (Application of Accelerated Vibration Testing to Spot-welding Specimen)

  • 김관주;조성신;정진성
    • 한국자동차공학회논문집
    • /
    • 제11권3호
    • /
    • pp.209-213
    • /
    • 2003
  • It is advantage of accelerated vibration testing to compress service exposures to operating vibration into a reduced laboratory test by increasing the amplitude or frequency of the applied input excitations. This paper proposes an accelerated test method to estimate the high-cycle fatigue life under random excitation. The method consists of conducting a test with amplified input excitation and extrapolating linearly the lift in the accelerated condition into the real lift in field condition. The extrapolation is carried out applying the high-cycle irregular excitation fatigue theory including the rainflow counting, Miner’s damage accumulation rule, and Goodman’s mean stress correction. As a verification, those estimated lift is compared with that acquired by experiment f3r the simple case of spot welding specimen with good agreement. This testing procedure will provide an useful scheme that can reduce testing period associated with developing time schedule of new product.

산업용 인버터의 가속 피로수명 평가에 관한 연구 (A Study on Accelerated Fatigue Life Testing for Industrial Inverter)

  • 이상훈;김원진
    • 한국기계가공학회지
    • /
    • 제21권6호
    • /
    • pp.67-73
    • /
    • 2022
  • Industrial inverters are used in a variety of fields for electric power supply. They may be exposed to vibration and heat once they are installed. This study focused on a framework of accelerated life testing of an industrial inverter considering fatigue damage as the primary source of deterioration. Instead of analyzing detailed failure mechanisms and the product's vulnerability to them, the potential of fatigue failure is considered using the fatigue damage spectrum calculated from the environmental vibration signals. The acceleration and temperature data were gathered using field measurement and spectral analysis was conducted to calculate the vibration signal's power spectral density (PSD). The fatigue damage spectrum is then calculated from the input PSD data and is used to design an accelerated fatigue life testing. The PSD for the shaker table test is derived that has the equivalent fatigue damage to the original input signal. The tests were performed considering the combined effect of random vibration and elevated temperature, and the product passed all the planned tests. It was successfully demonstrated that the inverter used in this study could survive environmental vibration up to its guarantee period. The fatigue damage spectrum can effectively be used to design accelerated fatigue life testing.

가진 시험 방법을 활용한 자동차 도어 플레이트 모듈 슬램 내구 평가 (Evaluation on Slam Resistance of Door Plate Module Using Vibration Testing Method)

  • 김찬중;손태관
    • 한국소음진동공학회논문집
    • /
    • 제22권10호
    • /
    • pp.968-973
    • /
    • 2012
  • Slam testing is a mandatory testing process to evaluate the fatigue resistance of a door plate module before delivering it to car makers. This process is very hard job to complete it since the testing facilities are considerably expensive and the required testing time is relatively very long, i.e. more than eight days for a single specimen. In this paper, an accelerated testing method of a door plate module is proposed using vibration test equipment instead of the current one by exposing to the critical excitation of a door glass. Under the proposed excitation method, the similar testing result can be evaluated within less than two hours. The suitability of the proposed testing method was demonstrated by comparing failure modes of both the current testing method and the proposed one.

랜덤 진동 조건에서의 압축기 연결 파이프에 대한 가속 수명 팩터 선정 및 진동 피로 해석 (Evaluation of the Acceleration-factor and Analysis of the Vibration Fatigue for the Connection-pipe to the Compressor under the Random Vibration)

  • 한형석;정우승;윤경종;모진용
    • 한국소음진동공학회논문집
    • /
    • 제18권3호
    • /
    • pp.323-334
    • /
    • 2008
  • According to the delivery condition, the breakage of a product occurs when it is delivered to the customers. Therefore product's makers evaluate the durability under the delivery process by accelerated life testing. In order to conduct this accelerated life testing accurately, it is very important to identify the acceleration-factor exactly between on-road and accelerated life test condition. In this paper, the acceleration-factor is identified by applying linear damage summation law, rain-flow cycle counting and Dirlik theory under the conditions of the random vibration. And approximated FEM model of the connecting-pipe to the compressor is developed for fatigue analysis. This model is finally verified by comparing the experiment results to the numerical analysis results.

텅스텐 백열전구의 필라멘트 단선에 대한 가속수명시험 (An Accelerated Life Test for Burnout of Tungsten Filament of Incandescent Lamp)

  • 이재국;김진우;신재철;김명수
    • 한국신뢰성학회:학술대회논문집
    • /
    • 한국신뢰성학회 2004년도 정기학술대회
    • /
    • pp.129-137
    • /
    • 2004
  • This paper presents an accelerated life test for burnout of tungsten filament of incandescent lamp. From failure analyses of field samples, it is shown that their root causes are local heating or hot sports in the filament caused by tungsten evaporation and wire sag. Finite element analysis is performed to evaluate the effect of vibration and impact for burnout, but any points of stress concentration or structural weakness are not found in the sample. To estimate the burnout life of lamp, an accelerated life test is planned by using quality function deployment and fractional factorial design, where voltage, vibration, and temperature are selected as accelerating variables. We assumed that Weibull lifetime distribution and a generalized linear model of life-stress relationship hold through goodness of fit test and test for common shape parameter of the distribution. Using accelerated life testing software, we estimated the common shape parameter of Weibull distribution, life-stress relationship, and accelerating factor.

  • PDF

Remaining useful life prediction for PMSM under radial load using particle filter

  • Lee, Younghun;Kim, Inhwan;Choi, Sikgyoung;Oh, Jaewook;Kim, Namsu
    • Smart Structures and Systems
    • /
    • 제29권6호
    • /
    • pp.799-805
    • /
    • 2022
  • Permanent magnet synchronous motors (PMSMs) are widely used in systems requiring high control precision, efficiency, and reliability. Predicting the remaining useful life (RUL) with health monitoring of PMSMs prevents catastrophic failure and ensures reliable operation of system. In this study, a model-based method for predicting the RUL of PMSMs using phase current and vibration signals is proposed. The proposed method includes feature selection and RUL prediction based on a particle filter with a degradation model. The Paris-Erdogan model describing micro fatigue crack propagation is used as the degradation model. An experimental set-up to conduct accelerated life test, capable of monitoring various signals was designed in this study. Phase current and vibration data obtained from an accelerated life test of the PMSMs were used to verify the proposed approach. Features extracted from the data were clustered based on monotonicity and correlation clustering, respectively. The results identify the effectiveness of using the current data in predicting the RUL of PMSMs.

텅스텐 백열전구의 필라멘트 단선에 대한 가속수명시험 (An Accelerated Life Test for Burnout of Tungsten Filament of Incandescent Lamp)

  • 김진우;신재철;김명수;이재국
    • 대한기계학회논문집A
    • /
    • 제29권7호
    • /
    • pp.921-929
    • /
    • 2005
  • This paper presents an accelerated life test for burnout of tungsten filament of incandescent lamp. From failure analyses of field samples, it is shown that their root causes are local heating or hot spots in the filament caused by tungsten evaporation and wire sag. Finite element analysis is performed to evaluate the effect of vibration and impact for burnout, but any points of stress concentration or structural weakness are not found in the sample. To estimate the burnout life of lamp, an accelerated life test is planned by using quality function deployment and fractional factorial design, where voltage, vibration, and temperature are selected as accelerating variables. We assumed that Weibull lifetime distribution and a generalized linear model of life-stress relationship hold through goodness of fit test and test for common shape parameter of the distribution. Using accelerated life testing software, we estimated the common shape parameter of Weibull distribution, life-stress relationship, and accelerating factor.

The Dynamics of Noise and Vibration Engineering Vibrant as ever, for years to come

  • Leuridan, Jan
    • 한국소음진동공학회:학술대회논문집
    • /
    • 한국소음진동공학회 2010년도 춘계학술대회 논문집
    • /
    • pp.47-47
    • /
    • 2010
  • Over the past 20 years, constant progress in noise and vibration (NVH) engineering has enabled to constantly advance quality and comfort of operation and use of really any products - from automobiles to aircraft, to all kinds of industrial vehicles and machines - to the extend that for many products, supreme NVH performance has becomes part of its brand image in the market. At the same time, the product innovation agenda in the automotive, aircraft and really many other industries, has been extended very much in recent years by meeting ever more strict environmental regulations. Like in the automotive industry, the drive towards meeting emission and CO2 targets leads to very much accelerated adoption of new powertrain concepts (downsizing of ICE, hybrid-electrical...), and to new vehicle architectures and the application of new materials to reduce weight, which bring new challenges for not only maintaining but further improving NVH performance. This drives for innovation in NVH engineering, so as to succeed in meeting a product brand performance for NVH, while as the same time satisfying eco-constraints. Product innovation has also become increasingly dependent on the adoption of electronics and software, which drives for new solutions for NVH engineering that can be applied for NVH performance optimization of mechatronic products. Finally, relentless pressure to shorten time to market while maintaining overall product quality and reliability, mandates that the practice and solutions for NVH engineering can be optimally applied in all phases of product development. The presentation will first review the afore trends for product and process innovation, and discuss the challenges they represent for NVH engineering. Next, the presentation discusses new solutions for NVH engineering of products, so as to meet target brand values, while at the same time meeting ever more strict eco constraints, and this within a context of increasing adoption of electronics and controls to drive product innovation. NVH being very much defined by system level performance, these solutions implement the approach of "Model Based System Engineering" to increase the impact of system level analysis for NVH in all phases of product development: - At the Concept Phase, to be able to do business case analysis of new product concepts; to arrive at an optimized and robust product architecture (e.g. to hybrid powertrain lay-out, to optimize fuel economy); to enable target cascading, to subsystem and component level. - In Development Phase, to increase realism and productivity of simulation, so as to frontload virtual validation of components and subsystems and to further reduce reliance on physical testing. - During the final System Testing Phase, to enable subsystem testing by a combination of physical testing and simulation: using simulation models to simulate the final integration context when testing a subsystem, enabling to frontload subsystem testing before final system integration is possible. - To interconnect Mechanical, Electronical and Controls engineering, in all phases of development, by supporting model driven controls engineering (MIL, SIL, HIL). Finally, the presentation reviews examples of how LMS is implementing such new applications for NVH engineering with lead customers in Europe, Asia and US, with demonstrated benefits both in terms of shortening development cycles, and/or enabling a simulation based approach to reduce reliance on physical testing.

  • PDF

온도상태에 따른 신축관 이음의 수명예측에 관한 연구 (A Study for Lifespan Prediction of Expansion by Temperature Status)

  • 오정수;이봉수
    • 한국산학기술학회논문지
    • /
    • 제19권10호
    • /
    • pp.424-429
    • /
    • 2018
  • 본 연구에서는 플랜트 설비 부품류 중 충격에 취약한 신축관 이음을 대상으로 수충격 발생 시 신축관 이음의 신축량을 유압식 액추에이터의 작동데이터로 적용하여 진동내구 시험을 수행하였다. 진동내구 시험 시 내구수명의 가속 요소로 신축관 내부의 온도상태를 가정하고 온도상태를 $30^{\circ}C$부터 $50^{\circ}C$$65^{\circ}C$로 가속화한 진동내구 시험을 진행하였다. 각 조건별 온도상태별 수명데이터들은 아레니우스 모델식을 따른다고 가정하고 각 수명데이터를 선형화하여 선형식의 상수값과 활성화 에너지 계수를 유도하였다. 또한 유도된 모델식으로부터 $85^{\circ}C$ 경우의 예측 수명과 $85^{\circ}C$ 온도상태에서의 시험 수명결과와 비교를 통해 작은 편차 범위내에서 유도된 모델식의 유효성을 검증하였다. 한편, 시험 중과 시험 후 발견된 신축관의 고장모드에서는 누수 및 벨로우즈 부 내부 슬리부의 이탈과 내부변형 등을 확인할 수 있었다. 향후 본 연구는 진동내구 수명의 가속요인인 온도상태 외 압력상태 등 다양한 수명변수를 적용한 복합수명예측 모델식을 개발하고 검증할 예정이다.