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.

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.

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.

The Development of Accelerated Life Test Method of Multi-Layer Nano Thin Film Glass for Electric Automobiles

2018 ◽  
Vol 789 ◽  
pp. 120-125
Author(s):  
Young Ju Jeon ◽  
Hyeong Seok Han ◽  
Ming Yung Shin ◽  
Ok Ju Kwak ◽  
Hyun Taeck Lim
Keyword(s):  
Thin Film ◽  
Automobile Industry ◽  
High Heat ◽  
Development Stage ◽  
Test Method ◽  
Accelerated Life Test ◽  
Life Test ◽  
Heating Source ◽  
Accelerated Life ◽  
Ag Particles

According to expansion of electric automobiles, the multi-layer nano thin film glass withheating source is researched to retain safety driving for winter. Generally, the tungsten wire is usedas a heating source of electric automobile glass. Due to its low visibility, silver (Ag) particles areresearched for years. Ag is widely used as a material of heater in the automobile industry since ithas relatively high heat and electrical conductivities. However, the multi-layer nano thin film glassusing Ag particles is under development stage and is not verified in the field, so recall and claimcan be raised. In this study, we will find the potential failure mechanism of the multi-layer nano thinfilm glass based on the properties, and then suggest accelerated life test method to verify 15 years inthe automobile application.

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