• 제목/요약/키워드: Accelerated Test

검색결과 1,543건 처리시간 0.035초

가속 스트레스의 교호작용을 고려한 가속계수 모델에 대한 연구 (Study on Acceleration Factor Model with Accelerated Stress Interactions)

  • 김형의;강보식;조유희
    • 대한기계학회논문집A
    • /
    • 제36권7호
    • /
    • pp.751-757
    • /
    • 2012
  • 사용조건에서 수명시험을 수행할 경우 시험시간이 많이 소요되므로 사용조건보다 가혹한 스트레스 조건을 추가하여 가속수명시험을 수행하면 시험시간을 단축시킬 수 있다. 수명에 영향을 미치는 스트레스를 선정하여 각 스트레스의 사용조건과 가속조건에서 시험을 수행할 경우 가속 스트레스간에 교호작용이 존재할 수 있다. 그러나 기존의 연구에서는 2가지 이상의 가속 스트레스를 부과하여 가속수명시험을 수행할 경우 교호작용을 고려하지 않은 경우와 가속 수명에 대한 모델식을 제시한 연구들이 대부분이다. 본 논문에서는 기계류 부품의 수명에 영향을 미치는 가속 스트레스를 선정한 후 교호작용을 고려한 시험계획에 따라 가속수명시험을 수행한 자료를 이용하여 가속 계수와 가속 스트레스간의 관계식을 산출하는 방법을 제시하고자 한다. 또한 본 논문에서 제시한 교호작용을 고려한 가속시험방법과 가속 계수를 산출할 수 있는 모델식을 이용하여 복합적인 가속수명시험 수행시 쉽게 적용하고 결과를 산출할 수 있는 기초가 될 것으로 기대된다.

청소기모터의 가속수명시험설계 (Accelerated Life Test Design for Vacuum Cleaner Motors)

  • 이기화;윤원영
    • 한국신뢰성학회지:신뢰성응용연구
    • /
    • 제9권1호
    • /
    • pp.47-58
    • /
    • 2009
  • In this paper, an accelerated life test procedure for a vacuum cleaner motor is proposed. We investigate the failure mechanism of the motor and select some accelerating factors and determine the orifice size as a key accelerating factor. Three stress levels of orifice size are tested and the failure data with censored data are analyzed. The modified accelerating test will reduce the test time in design phase by using the accelerating factor.

  • PDF

Study on Properties and Accelerated Life-time Test of Rubber O-ring by Temperature Stress

  • Shin, Young-Ju;Kang, Bong-Sung;Chung, Yu-Kyung;Choi, Kil-Yeong;Shin, Sei-Moon
    • 한국신뢰성학회:학술대회논문집
    • /
    • 한국신뢰성학회 2006년도 학술발표대회 논문집
    • /
    • pp.48-54
    • /
    • 2006
  • In this thesis, accelerated life test (ALT) method and procedure for rubber O-ring are applied to assure specified reliability of the products at guaranteeing the life of the products. Rubber O-ring is parts that keep intensity or make machine operation smoothly on attrition portion of machine and is used to prevent that oil is leaked. Usually. Rubber O-ring used NBR that is copolymer of acrylonitrile and butadiene. this are superior oil resistance, heat resistance, durability of abrasion, cold resistance, chemical resistance etc. The accelerated life test model for rubber O-ring are developed using the relationship between stresses and life characteristics of products. Using the accelerated life test method and the acceleration life test equipment which is developed, we performed life test, collected life data and analyzed the results of tests. The proposed accelerated life test method and procedure may be extended and applied to testing similar kinds of products to reduce test times and costs of the tests remarkably.

  • PDF

ECU 품질 개선을 위한 Accelerated Run-in Test 설계 및 효과고찰 (Design and Application of Accelerated Run-in Test for ECU Quality Improvement)

  • 조효근
    • 한국자동차공학회논문집
    • /
    • 제22권4호
    • /
    • pp.145-151
    • /
    • 2014
  • Modern vehicle has a lot of ECU(Electronic Control Unit) products to control many parts such as engine, transmission, brake, body and so on. ECU quality is one of important factors related to vehicle quality and driver's safety. Based on Bath-tub curve which presents failure rate during product lifetime, we designed and applied Accelerated Run-in Test into manufacturing line by simulating stress amount to ECU and developing the required software and efficient test equipment for mass production. This test makes ECU products stressed through electrical and thermal stresses under excessive driving condition, which induce potential initial failure of components in the ECU during production. The outcome until these days proved that Acceleration Run-in Test have reduced initial failure rates and increased quality of ECU products in the field outstandingly.

OLED 소자의 가속수명 시험에 관한 연구 (A study on OLED device's accelerated lifetime test)

  • 최영태;조재립
    • 대한안전경영과학회지
    • /
    • 제10권3호
    • /
    • pp.73-79
    • /
    • 2008
  • Display's life time is defined as the time of 50% luminance drop. It was used luminance and temperature as accelerated factor to accelerated lifetime at test. When it's working jule-heat is generated and device's temperature is growing as any temperature because OLED is self-luminance display device. So we decided temperature condition is 25, $70^{\circ}C$, and luminance condition is $60{\sim}300cd/m^2$ in test. It's assumed accelerated lifetime model by result of the test.

가속열화시험을 적용한 MEMS 진공패키지의 신뢰성 분석 및 개선 (Reliability Assessment and Improvement of MEMS Vacuum Package with Accelerated Degradation Test (ADT))

  • 최민석;김운배;정병길;좌성훈;송기무
    • 한국신뢰성학회지:신뢰성응용연구
    • /
    • 제3권2호
    • /
    • pp.103-116
    • /
    • 2003
  • We carry out reliability tests and investigate the failure mechanisms. of the wafer level vacuum packaged MEMS gyroscope sensor using an accelerated degradation test. The accelerated degradation test (ADT) is used to evaluate reliability (and/or life) of the MEMS vacuum package and to select the accelerated test conditions, which reduce the reliability testing time. Using the failure distribution model and stress-life model, we are able to estimate the average life time of the vacuum package, which is well agreed with the measured data. After improving several package reliability issues such as prevention of gas diffusion through package, we carry out another set of accelerated tests at the chosen acceleration level. The results show that reliability of the vacuum packaged gyroscope has been greatly improved and can survive without degradation of performance, which is the Q-factor in gyroscope sensor, during environmental stress reliability tests.

  • PDF

가속 열화 시험에 따른 저압용 차단기의 물리적 특성에 관한 연구 (A Study on the Physical Characteristics of the Low-voltage Circuit Breaker Based on the Accelerated Degradation Test)

  • 강신동;김재호
    • 한국안전학회지
    • /
    • 제37권6호
    • /
    • pp.1-8
    • /
    • 2022
  • This study analyzed the characteristics of insulation resistance and operating time based on an accelerated degradation test of a low-voltage circuit breaker. The experimental sample used a molded case circuit breaker (MCCB) and an earth leakage circuit breaker (ELCB). After measuring the insulation resistance of the circuit breakers, the leakage current was affected by an external rather than an internal structure. Furthermore, the insulation resistance of the circuit breakers with accelerated degradation was measured using a Megger insulation tester. In the accelerated degradation test, aging times of five, ten, 15, and 20 years were applied according to a temperature derived using the Arrhenius equation. Circuit breakers with an equivalent life of ten, 15, and 20 years had increased insulation resistance compared to those with less degradation time. In particular, the circuit breaker with an equivalent life of ten years had the highest insulation resistance. Component analysis of the circuit breaker manufactured through an accelerated degradation test confirmed that the timing of the increase in insulation resistance and the time of additive loss were the same. Finally, after analyzing the operating time of the circuit breakers with degradation, it was confirmed that the MCCB did not change, but the ELCB breaker failed.

고로슬래그 미분말과 플라이애시를 사용한 비소성 시멘트 모르타르의 촉진 탄산화에 따른 압축 강도 특성 (Properties of Compressive Strength after Accelerated Carbonation of Non-Sintered Cement Mortar Using Blast Furnace Slag and Fly Ash)

  • 류지수;나형원;형원길
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2023년도 봄 학술논문 발표대회
    • /
    • pp.297-298
    • /
    • 2023
  • In the concrete industry, efforts are being made to reduce CO2 emissions, and technologies that collect, store, and utilize CO2 have recently been studied. This study analyzed the change in compressive strength after the accelerated carbonation test of Non-Sintered Cement(NSC) mortar. Type C Fly Ash and Type F Fly Ash were mixed in a 1:1 ratio and then mixed with Blast Furnace Slag fine powder to produce NSC. The mortar produced was cured underwater until the target age. In addition, an accelerated carbonation test was conducted under the condition of a concentration of 5 (±1.0%) of CO2 gas for 14 days. The mortar compressive strength was measured before and after 14 days of accelerated carbonation test based on the 7th and 28th days of age. As a result of the experiment, the compressive strength was improved in all binder. In general, the compressive strength of NSC mortar subjected to the accelerated carbonation test was similar to that of Ordinary Portland Cement(OPC) mortar not subjected to the accelerated carbonation test.

  • PDF

냉장고 도어스위치의 가속수명시험 (Accelerated Life Test for Door Switch of Refrigerator)

  • 유동수;김상욱;장영기;문철희
    • 한국신뢰성학회지:신뢰성응용연구
    • /
    • 제5권2호
    • /
    • pp.273-287
    • /
    • 2005
  • Accelerated life test models and procedure are developed to assess the reliability of Refrigerator door switch. The main function of door switch is to operate bulb lamp and fan motor in the refrigerating room. The accelerated life test method and test equipments are developed using the relationship between stresses and life characteristics of the products. Using the developed accelerated life test method, the parameters of the ALT model and life time distribution are estimated and the reliability of the Door S/W at use condition if assessed. The proposed accelerated life test method and procedure may be extended and applied to testing similar kinds of products to reduce test time and costs of the tests remarkably.

  • PDF

실외조명 LED용 SMPS의 가속수명시험법 제안 (Suggested Accelerated Life Test Method of SMPS for Outdoor Lighting LED)

  • 임성용;형재필;임홍우;오근태
    • 한국신뢰성학회지:신뢰성응용연구
    • /
    • 제18권1호
    • /
    • pp.8-19
    • /
    • 2018
  • Purpose: This study has developed the accelerated lifetime test method for smps for outdoor lighting LED through two factors of temperature and humidity. Methods: Acceleration condition was confirmed for each stress and model, and acceleration life test model was estimated according to acceleration condition. Results: As a result of confirming the accelerated life test model, in the case of humidity, acceleration was established only in the foreign products. Therefore, it is confirmed that the acceleration condition is insufficient. However, the estimated parameters for temperature are relatively constant. It is therefore suitable for power supply acceleration tests for outdoor lighting LEDs. Conclusion: The SMPS acceleration test for outdoor lighting LED can improve the availability of the product by developing an accelerated life test method that guarantees the reliability of the product.