An evaluation method of step-down stress accelerated life test based on Amsaa model

2015 ◽  
Author(s):  
Jingyue Yang ◽  
Jun Yao ◽  
Yan Song ◽  
Honghua Hu ◽  
Yanlin Zhao
Keyword(s):  
Evaluation Method ◽  
Accelerated Life Test ◽  
Life Test ◽  
Amsaa Model ◽  
Accelerated Life ◽  
Step Down

P-66: Accelerated Life Test (ALT) Evaluation Method for Backlight LEDs

2012 ◽  
Vol 43 (1) ◽  
pp. 1309-1311
Author(s):  
I-Hsun Hsieh ◽  
Kun-Hung Hsieh ◽  
Chih-Kai Wang ◽  
Wei-Chih Ke ◽  
Hsin-Mien Wang
Keyword(s):  
Evaluation Method ◽  
Accelerated Life Test ◽  
Life Test ◽  
Accelerated Life

A Study on Automatic Belt Tensioner Life Evaluation in Accessory Belt System

2005 ◽  
Vol 297-300 ◽  
pp. 1797-1803
Author(s):  
Do Hyun Jung ◽  
Sung In Bae ◽  
Joung Woo Phark
Keyword(s):  
Life Cycle ◽  
Evaluation Method ◽  
Accelerated Life Test ◽  
Water Pump ◽  
Life Test ◽  
Noise And Vibration ◽  
Data Analyses ◽  
Life Evaluation ◽  
Accelerated Life ◽  
Belt System

It is well-known that the noise and vibration from the torque change of the engine and the inertia change of its accessories (alternator and water pump) have severe effects on both the quality and the life expectancy of the engine belt system. An automatic belt tensioner is generally used not only to reduce the noise and vibration of such belt system, but also to enhance the life cycle. In the present research, measurement of the user running conditions and the data analyses were performed to try to derive an evaluation method of life cycle of such an automatic belt tensioner system. As a part of results, a running condition for the evaluation was suggested from the study of conditions loaded on an automatic belt tensioner. This running condition was divided into two parts, the Structure part and the Pulley one, and suggested separately for the accelerated life-test of the system. As the other part of the results, an accelerated life-test condition was derived using Palmgen-Miner rule for structure part. And a modified accelerated life-test condition, which uses temperature as an acceleration factor, was suggested for pulley part.

Study of High-Power White LED's Lifetime Based on Accelerated Life Test

2013 ◽  
Vol 800 ◽  
pp. 205-209 ◽  
Author(s):  
De Sheng Li ◽  
Nian Yu Zou ◽  
Yun Cui Zhang ◽  
Xiao Yang He ◽  
Yi Yang
Keyword(s):  
High Power ◽  
Accelerated Life Test ◽  
Reliability Test ◽  
White Led ◽  
Life Test ◽  
Arrhenius Model ◽  
White Leds ◽  
Accelerated Life ◽  
Temperature Levels

The study of LED reliability becomes more and more important with LED widely used in various areas, and accelerated life test (ALT) as an element of reliability test is widely used to predict the lifetime of LED. In this paper, ALTs have been carried out at various current levels and various temperature levels. In the current ALT experiment, three kinds of stressing currents were demonstrated for 1W white LEDs and lumen flux of the tested LEDs were studied, and based on Eyting model, lifetime of the tested LEDs is calculated about 6.86×105h. In the temperature ALT experiment, two kinds of stressing temperature were demonstrated for the same type of white LEDs and lumen flux were also studied, and based on Arrhenius model, lifetime of the tested LEDs is calculated about 7.41×105h. In addition, the color shifting velocity is faster than lumens depreciation velocity was observed in our experiment, which means the lifetime evaluating of white LED should be paid more attention.

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