Research on Speed Robustness for Airborne Hydraulic Pump in the Circular Stress Accelerated Life Test

2009 ◽  
Author(s):  
Yong Sang ◽  
Zhanlin Wang
Keyword(s):  
Accelerated Life Test ◽  
Hydraulic Pump ◽  
Life Test ◽  
Accelerated Life

Development of Accelerated Life Test Method of Hydraulic Pump

2006 ◽  
Vol 326-328 ◽  
pp. 1861-1864
Author(s):  
Dong Soo Jung ◽  
Hyoung Eui Kim ◽  
Sung Hun Kim ◽  
E Sok Kang
Keyword(s):  
Duty Cycle ◽  
Weighted Average ◽  
Life Time ◽  
Test Method ◽  
Accelerated Life Test ◽  
Hydraulic Pump ◽  
Life Test ◽  
Accelerated Life ◽  
Equivalent Load

This paper proposes a new accelerated life test method of hydraulic pump used in vehicles, which have multiple alternating loads. For determination of life time of hydraulic pump for given field conditions with respect to duty cycle, the equivalent load and speed of this unit has to be determined. Equivalent load and speed can be calculated from the given duty cycle using the predominant theory for cumulative fatigue damage. Finally, we can perform accelerated life test on hydraulic pump by determination of test pressure and speed from calculated equivalent cumulative damage per working cycle and weighted average speed.

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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