scholarly journals Investigation into the Worst Stress Condition for an Accelerated Life Test of a Compressor in Refrigerators - Acceleration Factor and the Reducible Test Time under Low Temperature -

2012 ◽  
Vol 16 (2) ◽  
pp. 43-48 ◽  
Author(s):  
Y.M. Jung ◽  
W.J. Joo ◽  
S.K. Jeong
Keyword(s):  
Low Temperature ◽  
Stress Condition ◽  
Acceleration Factor ◽  
Accelerated Life Test ◽  
Test Time ◽  
Life Test ◽  
Accelerated Life

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.

A Development of a New Life Test Procedure for Fan Motors

2006 ◽  
Vol 321-323 ◽  
pp. 1539-1542
Author(s):  
Wae Gyeong Shin ◽  
Soo Hong Lee ◽  
Young Sik Song
Keyword(s):  
Automotive Industry ◽  
Field Condition ◽  
Test Procedure ◽  
Test Method ◽  
Accelerated Life Test ◽  
Test Time ◽  
Life Test ◽  
Dc Motors ◽  
Accelerated Life ◽  
Automotive Parts

Reliability of automotive parts has been one of the most interesting fields in the automotive industry. Especially small DC motor was issued because of the increasing adoption for passengers’ safety and convenience. For several years, small DC motors have been studied and some problems of a life test method were found out. The field condition was not considered enough in the old life test method. It also needed a lot of test time. For precise life estimation and accelerated life test, new life test procedure was developed based on measured field condition. First, vibration condition on vehicle and latent force on fan motor shaft were measured and correlated with each other. Second, test condition was decided by obtained data. Finally, life of fan motors was estimated by new life test method in shorter test time.

Accelerated Life Test Model for Life Prediction of Piston Assemblies in Hydraulic Pump and Motor

2006 ◽  
Vol 326-328 ◽  
pp. 649-652 ◽  
Author(s):  
Y.B. Lee ◽  
H.E. Kim ◽  
Y.C. Yoo ◽  
J.H. Park
Keyword(s):  
High Speed ◽  
Operating Time ◽  
Accelerated Life Test ◽  
Test Time ◽  
Test Model ◽  
Life Test ◽  
Test Models ◽  
Accelerated Life ◽  
Low Weight ◽  
Sensitive Parameters

The safety factor of hydraulic piston pumps and motors shows a tendency to decrease due to high pressurization, high speed and low weight/volume realization to enhance the output density. Therefore, more effective test models are necessary to predict the exact life. The sensitive parameters in the endurance life test are speed, pressure and temperature, and failure production increases in proportion to the operating time. In this research, the authors propose a combined accelerated life test model using the analysis method of the combined accelerated life test results of piston-shoe assemblies by simultaneously applying high speed, high pressure and high temperature in accordance with the variation in speed, pressure and temperature in order to reduce the life test time.

Development of Accelerated Life Test Method of Pneumatic Cylinder

2006 ◽  
Vol 326-328 ◽  
pp. 653-656 ◽  
Author(s):  
Bo Sik Kang ◽  
H.E. Kim ◽  
Yong Cheol Kwon ◽  
Chang Seop Song
Keyword(s):  
Test Method ◽  
Accelerated Life Test ◽  
Test Time ◽  
Pneumatic Cylinder ◽  
Life Test ◽  
Working Pressure ◽  
Piston Velocity ◽  
Working Temperature ◽  
Accelerated Life ◽  
Pneumatic Cylinders

This paper proposed a new life test method of pneumatic cylinders used in pneumatic system, whose loads consist of working pressure, piston velocity, and working temperature. It is expected to reduce accelerated life test time greatly in case of accelerated life test with creating combined accelerated model of these three factors. We can determine the maximum accelerated factor by calculating the combined accelerated factor of working pressure, piston velocity and working temperature for various cases.

Study of the Accelerated Life Test Method for Power Train Components Under Cyclic Loads Using Weibull-IPL (Inverse Power Law) Model

2003 ◽  
Author(s):  
Geunho Lee ◽  
Hyoungeui Kim ◽  
Dosik Kim
Keyword(s):  
Test Method ◽  
Accelerated Life Test ◽  
Test Time ◽  
Cyclic Loads ◽  
Power Law Model ◽  
Life Test ◽  
Power Train ◽  
Inverse Power Law ◽  
Accelerated Life ◽  
Agricultural Tractor

This study was performed to develop the accelerated life test method using Weibull-IPL (Inverse Power Law) model for power train components that are running on cyclic loads. Weibull-IPL model is concerned with determining the assurance life with confidence level and the accelerated life test time. From the relation of weibull distribution factors and confidence limit, the testing times on the no or some number of failure acceptance criteria are determined. The power train components under cyclic loads generally represent wear and fatigue characteristics as a failure mode. IPL based on the cumulative damage theory is applied effectively the mechanical components to reduce the testing time and to achieve the accelerating test conditions. The proposed Weibull-IPL model is an approach to improve the reliability assessment on the statistical distribution and wear out failure mechanism concepts. As the actual application example, accelerated life test method of agricultural tractor transmission was described. Life distribution of agricultural tractor transmission was supposed to follow Weibull distribution and life test time was calculated under the conditions of average life (MTBF) 3,000 hours and 90% confidence level for one test sample. According to IPL, because test time can be shorten in case increase test load, test time could be reduced by 482 hours when we put the load 1.1 times of rated load than 0.73 times of rated load that is equivalent load calculated by load spectrum of the agricultural tractor. This time, acceleration factor was 11.7. This Weibull-IPL model can be used to develop accelerated test method of gear reducer, hydraulic hose, bearing and etc.

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