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"Reliability analysis of TBM disc cutters under different conditions" by Bolong Liu, Haiqing Yang et al.


Abstract
The reliability of disc cutters has a significant influence on the safety and working efficiency of tunnel boring machines (TBMs). To investigate the reliability of disc cutters under different geological and operational conditions, we conducted a series of novel rolling cutting tests on intact and jointed sandstone blocks using different dip angles and interlayers. Different normal forces and rotational speeds of the cutterhead were also applied during the experiment. A novel reliability estimation method, based on a logistic regression model, was then proposed, and the influence of dip angle, strata, normal force, and rotational speed on the reliability of the disc cutter were analyzed. The reliability estimation method consisted of data acquisition regarding the normal force and cutter wear, feature extraction using wavelet packet transform and correlation analysis, and the estimation of the logistic regression model. To obtain the spectrum and normalized wavelet e ....

Disc Cutter Reliability , Logistic Regression Model , Tunnel Boring Machine ,

[Full text] Prevalence and Risk Factors of Chronic Obstructive Pulmonary Disease i


1– 3
1Department of Respiratory and Critical Care Medicine, The First People’s Hospital of Kashi Prefecture, Kashi, Xinjiang, People’s Republic of China;
2The Second Clinical College, Guangzhou University of Chinese Medicine, Guangzhou, People’s Republic of China;
3The Third Comprehensive Department, The Second Affiliated Hospital, Guangzhou University of Chinese Medicine (Guangdong Provincial Hospital of Chinese Medicine), Guangzhou, People’s Republic of China
These authors contributed equally to this work
Correspondence: Dayong Zheng
Department of Respiratory and Critical Care Medicine, The First People’s Hospital of Kashi Prefecture, 120 Yingbin Road, Kashi City, Xinjiang, 844000, People’s Republic of China
Tel +13570029702
Ji-Qiang Li ....

South Korea , Eteläuomen Läi , United States , Wang Chen , Single Factor Analysis Of The Research Population , Guang Zhou Graduate School Of Medicine , European Respiratory Society , World Health Organization , Potential Risk , Different Age , Different Geographical , Different Regions , Adjusted Prevalence , Risk Factors , Single Factor Analysis , Logistic Regression Model , Logistic Regression Analysis , Family History , Treatment Status , Different Severity , Professor Zhong , Guang Zhou Graduate School , தெற்கு கொரியா , ஒன்றுபட்டது மாநிலங்களில் , வாங் சென் , ஒற்றை காரணி பகுப்பாய்வு ஆஃப் தி ஆராய்ச்சி பாப்யுலேஶந் ,