scholarly journals Residual life estimation of cracked aircraft structural components

2018 ◽  
Vol 46 (1) ◽  
pp. 124-128 ◽  
Author(s):  
Mirko Maksimovic ◽  
Ivana Vasovic ◽  
Katarina Maksimovic ◽  
Natasa Trisovic ◽  
Stevan Maksimovic
Keyword(s):  
Residual Life ◽  
Structural Components ◽  
Life Estimation

Residual life estimation based on a generalized Wiener degradation process

2014 ◽  
Vol 124 ◽  
pp. 13-23 ◽  
Author(s):  
Xiaolin Wang ◽  
Narayanaswamy Balakrishnan ◽  
Bo Guo
Keyword(s):  
Residual Life ◽  
Degradation Process ◽  
Life Estimation

Fatigue Life Assessment of Crane Reel

2011 ◽  
Vol 383-390 ◽  
pp. 2941-2944
Author(s):  
Wei Ming Du ◽  
Fei Xue
Keyword(s):  
Finite Element Method ◽  
Fatigue Life ◽  
Fatigue Damage ◽  
Residual Life ◽  
Life Assessment ◽  
Life Estimation ◽  
Fatigue Life Assessment ◽  
Weld Fatigue ◽  
Simulation Results ◽  
Cumulative Fatigue Damage

The crane reel is generally manufactured by section welding method when the diameter is over 380mm. With the cumulative fatigue damage principle which is based on stress S-N curve, the fatigue damage of one crane reel is analyzed by finite element method, the reel weld fatigue strength and fatigue life are calculated, and the simulation results are proved to be reliable. This method provides an efficient reference for crane reel design and residual life estimation.

scholarly journals Analysis Using Various Approaches for Residual Life Estimation of Power Transformers

2019 ◽  
Vol 11 (2) ◽  
pp. 389-407
Author(s):  
Deepak Kanumuri ◽  
◽  
Veena Sharma ◽  
O. P. Rahi ◽  
◽  
...  
Keyword(s):  
Residual Life ◽  
Power Transformers ◽  
Life Estimation

scholarly journals Bayesian Estimation of Residual Life for Weibull-Distributed Components of On-Orbit Satellites Based on Multi-Source Information Fusion

2019 ◽  
Vol 9 (15) ◽  
pp. 3017
Author(s):  
Qian Zhao ◽  
Xiang Jia ◽  
Zhijun Cheng ◽  
Bo Guo
Keyword(s):  
Information Fusion ◽  
Bayesian Method ◽  
Residual Life ◽  
Small Sample ◽  
Similar Data ◽  
Posterior Distributions ◽  
Source Information ◽  
Monte Carlo Simulation Study ◽  
Life Estimation ◽  
Distributed Components

Residual life estimation is an important problem in reliability engineering. Traditional methods, which are based on time-to-failure distribution, have limitations for components of on-orbit satellites characterized as high reliability with small sample size. Various types of reliability information can be collected during test and operation, including historical lifetime data, degradation data, similar data, expert information, etc. Therefore, making full use of multi-source information is meaningful for improving estimation precision. However, research on residual life estimation by fusing multi-source information is rare. No study has examined the overall process of fusing all of the different kinds of information. In this paper, a Bayesian method is presented to estimate the residual life of Weibull-distributed components of on-orbit satellites by fusing all the collected information. Prior distributions are determined using different kinds of information. After fusing the field data, posterior distributions can be obtained corresponding to each prior distribution. Then, the joint posterior distribution is the weighted sum of these posterior distributions with weights calculated using the second Maximum Likelihood Estimation (ML-II) method. Consistency is tested to guarantee the safety of the information fusion. Furthermore, residual life is estimated by the proposed sample-based method including both the Bayesian estimate and credible interval (CI). A Monte Carlo simulation study is conducted to demonstrate the proposed methods and shows that the Bayesian method is satisfactory and robust. Finally, a published dataset of the momentum wheel in a satellite is analyzed to illustrate the application of the method.

Nozzle Diaphragms of Liquid Rocket Engines. Residual Life Estimation of the Blade with a Crack

NDT World ◽  
2016 ◽  
Vol 19 (3) ◽  
pp. 54-58
Author(s):  
Полянский ◽  
Aleksandr Polyansky ◽  
Полянский ◽  
Vladislav Polyansky
Keyword(s):  
Fracture Mechanics ◽  
Material Science ◽  
Science Studies ◽  
Residual Life ◽  
Rocket Engines ◽  
Pressure Side ◽  
Surface Cracks ◽  
Life Estimation ◽  
Liquid Rocket Engines ◽  
Liquid Rocket

Introduction. The results of multiple tests of liquid rocket engines indicate that the engine with cracks in blades can "safely" work within a few launchings. Therefore, the resource estimation of the nozzle blade with a crack becomes highly relevant, especially for reusable rocket engines. The objective of this work was to determine the residual life of nozzle diapgragm blades with cracks. Method. For reliable residual life estimation of the blade with a crack the comprehensive approach was used: fractographic and material science studies on the one hand and fracture mechanics propositions on the other hand. Results. Fractographic and material science studies have shown that blade destruction occurs through the countergrowth of fatigue surface cracks from the blade pressure side and the blade suction face, which interconnects to form a "main" crack, whose growth is controlled by growth of surface cracks from the blade pressure side. Using the fracture mechanics propositions and the results of finite element calculations of the stress-strain state of nozzle diaphragm blades under gas and thermal loads in elasto-plastic formulation, equations of crack growth in nozzle blades were obtained. Finally the scheme of blade unstable fracture is proposed; the blade guaranteed residual life under certain conditions is evaluated and the maximum tolerable crack length in the blade suction face is determined. Conclusion. The method offered in this work makes it possible to evaluate the blade residual life as the number of loading cycles while fatigue crack propagation and as the tolerable number of firing tests. The method also enables the maximum permissible crack lenth to be determined.

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