P-92: Rapid and Non-destructive Lifetime Estimation Method for LED Backlight Displays

2011 ◽  
Vol 42 (1) ◽  
pp. 1448-1450 ◽  
Author(s):  
Su-Yi Lin ◽  
Chi Sheng Chang ◽  
Tony Yang ◽  
Chang Shin Wu ◽  
Chen Cheng Chuan
Keyword(s):  
Estimation Method ◽  
Lifetime Estimation ◽  
Led Backlight ◽  
Non Destructive

Development of On-Line Monitoring System and Aging Characteristics Research of Switchgear

2013 ◽  
Vol 330 ◽  
pp. 364-367
Author(s):  
Shu Xin Liu ◽  
Yun Dong Cao ◽  
Chun Guang Hou ◽  
Yang Liu ◽  
Xiao Ming Liu
Keyword(s):  
Epoxy Resin ◽  
Monitoring System ◽  
Estimation Method ◽  
Current Transformer ◽  
Insulation Material ◽  
Electrical Characteristics ◽  
Infrared Transmission ◽  
Lifetime Estimation ◽  
Monitoring Method ◽  
On Line

For improving reliable operation of switchgear in power system, an approach for on-line monitoring the insulation characteristic and bus-bar temperature rising of the switchgear is proposed in this paper. Through comparing several existing temperature measurement methods for monitoring temperature rising elevation at bus-bas, a new design of temperature monitoring method is proposed. It adopts quick-magnetic saturated current transformer, temperature sensor and infrared transmission to solve the problem of high voltage isolation. The epoxy resin insulation material which is commonly used in switchgear its aging mechanism data is not complete, seriously restrict on-line monitoring for switchgear, so thousands hours of aging experiment is done on switchgear, systematic study various electrical characteristics variation law on the gradual aging process of epoxy resin insulation materials. Therefore, study on the aging characteristics of switchgearinsulation and its lifetime estimation method is the key technology to understand agingmechanism better, search for new fault diagnostic method and the way to extend theuseful lifetime of switchgear. At last, the system runs in real system and the result shows the on-line monitoring system is stable and reliable which can be provide reference for on-line monitoring system design of switchgear.

scholarly journals Estimating the age and mechanism of boulder transport related with extreme waves using lichenometry

2020 ◽  
Vol 44 (6) ◽  
pp. 870-897
Author(s):  
Maria A Oliveira ◽  
Esteve Llop ◽  
César Andrade ◽  
Cristina Branquinho ◽  
Ronald Goble ◽  
...  
Keyword(s):  
Age Estimation ◽  
Alternative Explanation ◽  
Estimation Method ◽  
Cost Effective ◽  
Optically Stimulated Luminescence ◽  
Extreme Waves ◽  
Non Destructive ◽  
Boulder Deposits ◽  
Lichen Growth

Tsunamis and storms cause considerable coastal flooding, numerous fatalities, destruction of structures, and erosion. The characterization of energy and frequency associated with each wave contribute to the risk assessment in coastal regions. Coastal boulder deposits represent a physical proof of extreme inundation and allow us to study the effects of marine floods further back in time than instrumental and historical records. Age estimation of these deposits is challenging due to lack of materials (such as sand, shells, corals, or organic matter) that retain information about the passage of time. Lichenometry, a simple age estimation method, which is cost-effective, quick to apply, and non-destructive, is here proposed as a solution. A lichen growth model for a calcium-tolerant lichen species was developed and used to estimate the age of a boulder deposit related to extreme marine inundation(s) in Portugal. Estimated ages indicate several very recent events (<700 years) for most of the boulders’ stabilization and agree with results obtained with optically stimulated luminescence of marine sands found beneath boulders. Frequent and recent boulder transport implies a storm-origin for this deposit. These conclusions contrast with other works describing identical deposits that are attributed to paleotsunamis. This study presents a methodology using lichenometry as a successful alternative for age estimation in rocky coastal settings. These results offer an alternative explanation for coastal boulder deposits found on the west coast of Portugal.

Thermal lifetime estimation method of IGBT module considering solder fatigue damage feedback loop

2018 ◽  
Vol 82 ◽  
pp. 51-61 ◽  
Author(s):  
Bing Gao ◽  
Fan Yang ◽  
Minyou Chen ◽  
Yigao Chen ◽  
Wei Lai ◽  
...  
Keyword(s):  
Fatigue Damage ◽  
Feedback Loop ◽  
Estimation Method ◽  
Lifetime Estimation ◽  
Igbt Module ◽  
Solder Fatigue

scholarly journals Fluorescence lifetime estimation method for incomplete decay

2015 ◽  
Vol 51 (21) ◽  
pp. 1666-1668 ◽  
Author(s):  
Hongqi Yu ◽  
David Day‐Uei Li
Keyword(s):  
Fluorescence Lifetime ◽  
Estimation Method ◽  
Lifetime Estimation

scholarly journals Lifetime Analysis of Motorized Spindle Bearings Based on Dynamic Model

2021 ◽  
Author(s):  
Jun Ying ◽  
Zhaojun Yang ◽  
Chuanhai Chen ◽  
Guoxiang Yao ◽  
Wei Hu ◽  
...  
Keyword(s):  
Dynamic Model ◽  
Estimation Method ◽  
Design Stage ◽  
Lifetime Estimation ◽  
Element Analysis ◽  
Actual Structure ◽  
Axial Forces ◽  
Stiffness Model ◽  
Lifetime Analysis ◽  
Motorized Spindles

Abstract The traditional probabilistic-based lifetime evaluation methods for motorized spindles neglect the effects of load dynamic and structure difference. Hence, a dynamic-model-based lifetime estimation method combining these effects is proposed to improve the estimating results for motorized spindles, especially in the design stage. Considering the bearings lifetime has dramatically influenced the reliability of motorized spindles, this paper establishes a shaft-bearing-toolholder based on a dynamic model to estimate the bearing group lifetime. The proposed dynamic model is closer to the actual structure in spindles, indicating the stiffness of bearings and contact surface conditional on the inputting radial-and-axial forces is nonlinear. The stiffness model is verified by finite element analysis and experiment. The load applied to bearings is accurately calculated through the dynamic model. Then, the load is introduced to a well-known bearing lifetime model, thereby calculating the lifetime of each bearing and its group. The bearing lifetime results under different conditions of preload, clamping force, and cutting force are discussed.

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