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Dynamic Interaction Analysis of Coupled Axial-Torsional-Lateral Mechanical Vibrations in Rotary Drilling Systems

Structural Durability & Health Monitoring 2025年第1期19卷 77-103页

作者： Sabrina Meddah Sid Ahmed Tadjer Abdelhakim Idir kong fah tee Mohamed Zinelabidine Doghmane Madjid Kidouche Applied Automation Laboratory Faculty of Hydrocarbons and ChemistryUniversity of BoumerdesBoumerdes35000Algeria Institute of Electrical and Electronic Engineering(IGEE) University of BoumerdesBoumerdes35000Algeria Laboratory of the Electrification of Industrial Enterprises University of BoumerdesBoumerdes35000Algeria Electrical Engineering Department Mohamed Boudiaf University of M’silaM’sila28000Algeria Department of Civil and Environmental Engineering King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Interdisciplinary Research Center for Construction and Building Materials King Fahd University of Petroleum&Minerals(KFUPM)Dhahran31261Saudi Arabia

Maintaining the integrity and longevity of structures is essential in many industries,such as aerospace,nuclear,and *** achieve the cost-effectiveness of large-scale systems in petroleum drilling,a strong emphasis on structural durability and monitoring is *** study focuses on the mechanical vibrations that occur in rotary drilling systems,which have a substantial impact on the structural integrity of drilling *** study speciﬁcally investigates axial,torsional,and lateral vibrations,which might lead to negative consequences such as bit-bounce,chaotic whirling,and high-frequency *** events not only hinder the efﬁciency of drilling but also lead to exhaustion and harm to the system’s components since they are difﬁcult to be detected and controlled in real *** study investigates the dynamic interactions of these vibrations,speciﬁcally in their high-frequency modes,usingﬁeld data obtained from measurement while ***ﬁndings have demonstrated the effect of strong coupling between the high-frequency modes of these vibrations on drilling sys-tem *** obtained results highlight the importance of considering the interconnected impacts of these vibrations when designing and implementing robust control ***,integrating these compo-nents can increase the durability of drill bits and drill strings,as well as improve the ability to monitor and detect ***,by exploiting theseﬁndings,the assessment of structural resilience in rotary drilling systems can be ***,the study demonstrates the capacity of structural health monitoring to improve the quality,dependability,and efﬁciency of rotary drilling systems in the petroleum industry.

关键词： Rotary drilling systems mechanical vibrations structural durability dynamic interaction analysis ﬁeld data analysis

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Time Series Analysis for Vibration-Based Structural Health Monitoring:A Review

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Structural Durability & Health Monitoring 2018年第3期12卷 129-147页

作者： kong fah tee School of Engineering University of GreenwichKentUK.

Structural health monitoring(SHM)is a vast,interdisciplinary research field whose literature spans several decades with focusing on condition assessment of different types of structures including aerospace,mechanical and civil *** need for quantitative global damage detection methods that can be applied to complex structures has led to vibration-based *** time series methods for SHM form an important and rapidly evolving category within the broader vibration-based *** the literature on the structural damage detection,many time series-based methods have been *** a considered time series model approximates the vibration response of a structure and model coefficients or residual error are obtained,any deviations in these coefficients or residual error can be inferred as an indication of a change or damage in the *** on the technique employed,various damage sensitive features have been proposed to capture the *** paper reviews the application of time series analysis for *** different types of time series analysis are described,and the basic principles are explained in ***,the literature is reviewed based on how a damage sensitive feature is *** addition,some investigations that have attempted to modify and/or combine time series analysis with other approaches for better damage identification are presented.

关键词： Time series snalysis structural health monitoring structural damage detection autoregressive model damage sensitive features

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Comparison of Structural Probabilistic and Non-Probabilistic Reliability Computational Methods under Big Data Condition

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Structural Durability & Health Monitoring 2022年第2期16卷 129-143页

作者： Yongfeng Fang kong fah tee School of Physics and Electronic Information Engineering Ningxia Normal UniversityGuyuan756000China School of Engineering University of GreenwichKentME44TBUK School of Mechanical Engineering Guizhou University of Engineering ScienceBijie551700China

In this article,structural probabilistic and non-probabilistic reliability have been evaluated and compared under big data ***,the big data is collected via structural monitoring and *** data is classified into different types according to the regularities of the distribution of *** different stresses which have been subjected by the structure are used in this ***,the structural interval reliability and probabilistic pre-diction models are established by using the stress-strength interference theory under big data of random loads after the stresses and structural strength are comprehensively *** reliability is computed by using various stress types,and the minimum reliability is determined as structural ***,the advan-tage and disadvantage of the interval reliability method and probability reliability method are shown by using three *** has been shown that the proposed methods are feasible and effective.

关键词： Big data structure interval reliability probabilistic reliability reliability index

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Finite Element Model Updating for Structural Health Monitoring

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Structural Durability & Health Monitoring 2020年第1期14卷 1-17页

作者： Amirabbas Haidarpour kong fah tee School of Engineering University of GreenwichChatham MaritimeKentME44TBUK

This paper provides a model updating approach to detect,locate,and char-acterize damage in structural and mechanical systems by examining changes in mea-sured vibration *** in vibration-based damage identification has been rapidly expanding over the last few *** basic idea behind this technology is that modal parameters(notably frequencies,mode shapes,and modal damping)are functions of the physical properties of the structure(mass,damping,and sifies).Therefore,changes in the physical properties will cause changes in the modal proper-ties which could be obtained by structural health monitoring(SHM).Updating is a process fraught with numerical *** arise from inaccuracy in the model and imprecision and lack of information in the measurements,mainly taken place in joints and critical *** motivation for the development of this technology ***,methods are categorized according to various criteria such as the level of damage detection provided from vibration testing,natural frequency and mode shape readings are then obtained by using modal analysis techniques,which are used for updating structural parameters of the associated finite element model The experi-mental studies for the laboratory tested bridge model show that the proposed *** using ME scope technique can provide reasonable model updating results.

关键词： Structural health monitoring model updating natural frequency mode shape stiffness vibration testing

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Extraction of real modes and physical matrices from modal testing

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Earthquake Engineering and Engineering Vibration 2011年第2期10卷 219-227页

作者： Wang Tong Zhang Lingmi tee kong fah MOE Key Lab of Structural Mechanics and Control for Aircraft Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Department of Civil Engineering University of Greenwich United Kingdom

A technique to extract real modes from the identified complex modes is presented in this paper, which enables the normalized real mode shapes, modal masses, and full or reduced mass and stiffness matrices to be obtained. The theoretical derivation of the method is provided in detail. An 11-DOF vibration system is used to validate the algorithm, and to analyze the effects of the number of modes utilized and measurement DOFs on the extraction results. Finally, the method is used to extract real modes from both experimental modal analysis and operational modal analysis.

关键词： modal analysis complex mode real mode normalized mode shape modal mass

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Continuing to Build a Life-Long Friendship: Canada and China

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Voice of Friendship 2006年第1期 49-50,52页

作者： kong fah Lee Former President of the Montreal Canada-China Society

The People’s Republic of Chi- na’s President Hu Jintao’s recent visit to Canada, coincided with the 35th anniversary of the Testablishment of diplomatic rela- tion between Canada and China. We are optimistic that h... 详细信息

关键词： Canada diplomatic visitors Pavilion friend coopera

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Esophageal rupture due to Sengstaken-Blakemore tube misplacement

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World Journal of Gastroenterology 2005年第41期11卷 6563-6565页

作者： Chee-fah Chong Emergency Department Shin-kong Wu Ho-Su Memorial Hospital TaipeiTaiwanChina

The author presents three cases of esophageal rupture during the treatment of massive esophageal variceal bleeding with Sengstaken-Blakemore (SB) tube. In each case, simple auscultation was used to guide SB tube insertion, with chest radiograph obtained only after complete inflation of the gastric balloon. Two patients died of hemorrhagic shock and one died of *** author suggests that confirmation of SB tube placement by auscultation alone may not be *** chest radiographs should be obtained before and after full inflation of the gastric balloon to confirm tube position and to detect tube dislocation.

关键词： Chest radiograph Esophageal rupture Sengstaken-Blakemore tube

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Passive harmonic mode locking of gain-guided solitons in erbium-doped fiber lasers

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Chinese Science Bulletin 2008年第5期53卷 676-680页

作者： ZHAO LuMing TANG DingYuan CHENG tee Hiang TAM Hwa-Yaw LU Chao School of Electrical and Electronic Engineering Nanyang Technological University 639798 Singapore Department of Electrical Engineering Hong Kong Polytechnic University Hong Kong China Department of Electronic and Information Engineering Hong Kong Polytechnic University Hong Kong China

We report the experimental observation of passive harmonic mode locking of gain-guided solitons in erbium-doped fiber lasers either made of purely normal dispersion fibers or operating in the net normal cavity dispersion regime. Harmonic-2 and harmonic-3 mode locking states of the gain-guided solitons with supermode suppression larger than 35 dB have been obtained.

关键词：铒掺杂光纤激光器孤波被动谐波振荡型同步正常色散

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Development of annulus fibrosus tissue construct with hydrogel coils containing pre-conditioned mesenchymal stem cell

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Journal of Materials Science & Technology 2021年第4期63卷 27-34页

作者： Yon Jin Chuah Yingnan Wu Mei Ling Shirlynn Cheong Yan Qing Chia Ching Ann tee Hwan Tak Hee Chenjie Xu Yuejun Kang Dong-An Wang School of Chemical and Biomedical Engineering Nanyang Technological University62 Nanyang Drive637459Singapore Lee kong Chian School of Medicine Nanyang Technological University59 Nanyang Drive636921Singapore Pinnacle Spine&Scoliosis Centre 3 Mount ElizabethMount Elizabeth Medical Centre228510Singapore Faculty of Materials and Energy Institute for Clean Energy and Advanced MaterialsSouthwest UniversityChongqing 400715China Department of Biomedical Engineering City University of Hong Kong83 Tat Chee AvenueKowloonHong KongChina National Dental Centre of Singapore 5 Second Hospital Ave168938Singapore

Low back pain associated with degenerative disc diseases has been a major health concern that brings suffering to the patients physically and *** existing therapeutic strategies provide shortterm relief of symptoms rather than treatment of the underlying *** of an engineered tissue for disc regeneration is still in its infancy due to the limited autologous healthy disc cell source from the *** is also challenging to mimic the complexity of micro-architecture in the native disc tissue that determine their unique structural *** date,simple tissue models that mimic the annulus fibrosus(AF)micro-environment for understanding the potential of mesenchymal stem cells(MSCs)in AF tissue engineering are still *** this study,the assembly of a coiled hydrogel microfiber has shown its capability to encapsulate MSCs and create an engineered tissue model that mimics the multiple lamellae of native *** this model,we investigated the potential of MSCs that were previously induced by ascorbic acid(AA).Compared to non-induced MSCs,AA-induced MSCs exhibited significant increase in AF-associated biomarkers during later development in the engineered AF tissue model and also encouraged collagen accumulation through the down-regulated catabolic gene MMP1 and upregulated anti-catabolic gene ***,AA-induced MSCs exhibited a Col2/Col1 ratio closer to that of a native AF *** results suggested that AA-induced MSCs could be a potential cell source for AF tissue engineering and this established tissue model may provide a simple tool for successful AF tissue engineering strategies in the future.

关键词： closer stem strategies

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An iterative approach to enhance the clinical learning experience in Macao nursing education

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International Journal of Nursing Sciences 2019年第2期6卷 216-220页

作者： Ming Liu Yok Man Chan Stephen tee Ken Gu Zhi Min Luo Thomas K.S.Wong School of Health Sciences Macao Polytechnic Institute Macao China Faculty of Health and Social Sciences Bournemouth University UK Knowledge Transfer and Consultancy Company Limited Hong Kong China

Objective: The aim of this study was to reduce or eliminate the stressors to enhance nursing students' clinical learning experience through implementation of an iterative approach that developed a personalised response to student ***: A prospective cohort research design was applied to collect data from a sample of undergraduate nursing students across the four study *** iterative approach was employed to improve students' learning experience and the Stressors in Nursing Students Scale-Chinese Version (SINS-CN) was used to measure student *** problems encountered by students were identified,refined and the responding solutions were worked out and implemented among this group of students through their first year to fourth ***: The overall SINS-CN mean score (2.17-2.82) of students was declined to a moderate ***: Having implemented iterative approach to address factors that led to stressful environments encountered by the nursing students,the overall stress score and each sub-dimension score decreased ***,it is recommended that this approach could be adopted by other colleagues in the nursing arena around the world.

关键词： Clinical Clerkship Nursing Nursing education Stressors Students

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