scholarly journals Estimating the parameters of Weibull distribution and the acceleration factor from hybrid partially accelerated life test

2012 ◽  
Vol 36 (7) ◽  
pp. 2920-2925 ◽  
Author(s):  
Ali A. Ismail
Keyword(s):  
Weibull Distribution ◽  
Acceleration Factor ◽  
Accelerated Life Test ◽  
Life Test ◽  
Accelerated Life

scholarly journals Design and application of accelerated life test of grating ruler based on step stress loading

2021 ◽  
Vol 336 ◽  
pp. 02027
Author(s):  
Jili Wang ◽  
Qingyu Li ◽  
Xiaocui Zhu ◽  
Cheng Gao ◽  
Yi Li ◽  
...  
Keyword(s):  
Weibull Distribution ◽  
Test Method ◽  
Accelerated Life Test ◽  
Test Scheme ◽  
Life Test ◽  
Test Device ◽  
Typical Application ◽  
Accelerated Life ◽  
Life Model ◽  
Accelerated Life Model

Combined with the actual project, a grating ruler accelerated life test device is designed, which can simulate the actual loads, including temperature, humidity and speed stress. An accelerated life test scheme based on stepped stress loading is proposed, and 6 grating rulers are tested based on time-censored test method. An accelerated life model based on Weibull distribution used for evaluating the lifetime is established. Related experimental techniques also can be typical application cases for innovative practical teaching.

Constant-Step-Stress Accelerated Life Test of White OLED Under Weibull Distribution Case

2012 ◽  
Vol 59 (3) ◽  
pp. 715-720 ◽  
Author(s):  
JianPing Zhang ◽  
TingJun Zhou ◽  
Helen Wu ◽  
Yu Wu ◽  
WenLi Wu ◽  
...  
Keyword(s):  
Weibull Distribution ◽  
Accelerated Life Test ◽  
Life Test ◽  
Accelerated Life ◽  
White Oled

scholarly journals Optimal Robot Motion for Accelerated Life Testing of a 6-DoF Industrial Robot

2020 ◽  
Vol 10 (21) ◽  
pp. 7459
Author(s):  
Seungjin Yoo ◽  
Jin Jang ◽  
Jai-Kyung Lee ◽  
Jong-Won Park
Keyword(s):  
Industrial Robot ◽  
Geometric Mean ◽  
Industrial Robots ◽  
Acceleration Factor ◽  
Accelerated Life Test ◽  
System Level ◽  
Test Time ◽  
Robot Motion ◽  
Life Test ◽  
Accelerated Life

In order to verify the reliability of drive components for industrial robots, component-level life tests must be accompanied by a system-level life test using actual robots in which predefined robot motions are repeated throughout the test. To properly verify the durability of drive components through a system-level life test, it is important to design test modes so that the required test time is the same for all joint drive components of the robot, and it is necessary to design test modes with a high acceleration factor so as to shorten the required test time as much as possible. To solve this problem, the present research proposes a method for designing robot motions that makes the accelerated life test time for all the drive components of the robot equal. In particular, we solve a dynamic based motion optimization problem for an industrial 6-DoF (degrees-of-freedom) robot that minimizes the AM-GM (arithmetic mean to geometric mean) ratio of the acceleration factors of each joint. The results show that C2-continuous test modes with the same acceleration factor, which is inversely proportional to the cycle time of the robot motion, can be derived.

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