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Smart monitoring of the expansion state of boiler water walls in coal-fired power plants using a digital twin model

Proceedings of the Estonian Academy of Sciences 2025年第2期74卷 149-154页

作者： Luo, Lijia Wang, Weida Lei, Zhenheng Bao, Shiyi Bassir, David Chen, Gongfa College of Mechanical Engineering Zhejiang University of Technology China Zhejiang Rancon Turbine Machinery Co. Ltd. China Smart Structural Health Monitoring and Control Laboratory Sino-French Institute Dongguan University of Technology China IRAMAT UMR-CNRS 7065 UTBM CEDEX Belfort France

This article presents an approach for monitoring the expansion state of water walls in coal-fired power plants using a digital twin (DT) model. The monitored boiler belongs to a 1000 MW ultrasupercritical power generating unit;it has been in service for more than 14 years and has accumulated more than 100 000 hours of operation. The fracture of the water wall has become a serious problem for safe operation. The size of the water wall is huge, the structure is complex, the stress state is changeable, and the fracture treatment is difficult. Existing online monitoring systems are mainly based on wall temperature, and it is difficult to evaluate the stress state of the water wall. However, there are few technical systems that can monitor the expansion displacement and local strain/stress of water walls online. To address this problem, a DT model is built to monitor the expansion state of boiler water walls. An optical non-contact strain monitoring system (based on digital image correlation (DIC) technologies) coupled with finite element analysis is developed to measure the actual strain/stress data and generate more simulation data for improving the accuracy of the DT model. This monitoring system provides an effective way to prevent the expansion fracture of the water wall. © 2025 Authors.

关键词： Fossil fuel power plants

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Electro-elastic Fields of Piezoelectric Materials with An Elliptic Hole under Uniform Internal Shearing Forces

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Chinese Journal of Mechanical Engineering 2013年第3期26卷 454-461页

作者： DU Yanliang LIU Shuhong DUAN Shijie LI Yanqiang Structural Health Monitoring and Control Institute Shijiazhuang Tiedao University Department of Engineering Mechanics Shijiazhuang Tiedao University Department of Adult Education Shijiazhuang Tiedao University

The existing investigations on piezoelectric materials containing an elliptic hole mainly focus on remote uniform tensile loads. In order to have a better understanding of the fracture behavior of piezoelectric materials under different loading conditions, theoretical and numerical solutions are presented for an elliptic hole in transversely isotropic piezoelectric materials subjected to uniform internal shearing forces based on the complex potential approach. By solving ten variable linear equations, the analytical solutions inside and outside the hole satisfying the permeable electric boundary conditions are obtained. Taking PZT-4 ceramic into consideration, numerical results of electro-elastic fields along the edge of the hole and axes, and the electric displacements in the hole are presented. Comparison with stresses in transverse isotropic elastic materials shows that the hoop stress at the ends of major axis in two kinds of material equals zero for the various ratios of major to minor axis lengths; If the ratio is greater than 1, the hoop stress in piezoelectric materials is smaller than that in elastic materials, and if the ratio is smaller than 1, the hoop stress in piezoelectric materials is greater than that in elastic materials; When it is a circle hole, the shearing stress in two materials along axes is the same. The distribution of electric displacement components shows that the vertical electric displacement in the hole and along axes in the material is always zero though under the permeable electric boundary condition; The horizontal and vertical electric displacement components along the edge of the hole are symmetrical and antisymmetrical about horizontal axis, respectively. The stress and electric displacement distribution tends to zero at distances far from the elliptical hole, which conforms to the conclusion usually made on the basis of Saint-Venant’s principle. Unlike the existing work, uniform shearing forces acting on the edge of the hole, an

关键词： piezoelectric material elliptic hole permeable boundary condition electro-elastic fields internal shearing forces

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Continuous measurement of lateral wheel/rail interaction force based on pvdf strain sensing technology

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Information Technology Journal 2013年第20期12卷 5818-5823页

作者： Song, Ying Wang, Zhi-Chen Du, Yan-Liang School of Transportation Institute Shijiazhuang 050043 China Structural Health Monitoring and Control Institute Shijiazhuang Tiedao University Shijiazhuang 050043 China

Oscillatory wheel load fluctuation of considerable amplitude is always observed in railway trains traveling at high speed. The study describes a new continuous method for measuring lateral force between wheel and rail without special wheelsets equipped with strain gauges and slip rings or telemeters. Track strain response upon wheel/rail interaction is measured based on PVDF (polyvinylidenefluoride) strain sensors and processed to generate a condition index which directly reflects the train operation condition. This approach is verified by finite element simulation and experimental test and the preliminary results show that this electromagnetic immune system provides an effective alternative for lateral wheel/rail interaction force measurement. The method significantly increases the efficiency of maintenance management and enhances the stability for tram operation and more importantly, avoids derailment timely. © 2013 Asian Network for Scientific Information.

关键词： Finite element method

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Infuencing Factors of Load Carrying Capacity and Cooperative Work Laws of Metro Uplift Piles

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structural Durability & health monitoring 2020年第3期14卷 249-264页

作者： Bo Liu Haoran Li Shuya Liu Structural Health Monitoring and Control Institute Shjazhuang Tiedao UniversityShjjazhuang050043China Shenzhen Metro Group Co LtdShenzhen518026China

The buoyancy of groundwater can reduce the foundation bearing capa-city and cause the metro tunnels to float as a whole,which threatens the safety of structures ***,uplift piles are set up to improve the structural *** this paper,FLAC3D software is used to establish the calculation models of pile *** bearing failure process of uplift piles was simulated to study the influencing factors on single pile load bearing capacity as well as the cooperative work laws of pile *** load-displacement curves of pile top under different length-diameter ratios,pile soil interface characteristics and pile types are obtained,*** results showed that,increasing the length-diameter ratio and the pile-soil interface roughness properdly can improve the bear-ing capacity of uplift ***,changing the shapes of constant pile section can also improve it,which has the most significant effect concerning of saving material *** the loading process of pile groups,the ultimate bearing capacity of corner pile is the biggest,the side pile is the next,and the center pile is the *** de formation characteristics of pile top are as follows:the center pile is the biggest,the side pile is the next,and comer pile is the *** with the results,the uplift resistance of group piles can be enhanced pertinently,and the conclusions provide guidance for the design and construction of up lift piles in the actual engineer.

关键词： Uplift pile length-diameter ratio utimate bearing capacity cooperative work

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Study on train wheel out-of-roundness monitoring method by PVDF sensing technology

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Open Mechanical Engineering Journal 2014年第1期8卷 77-80页

作者： Song, Ying Wang, Zhichen Du, Yanliang School of Transportation Institute Shijiazhuang Tiedao University Shijiazhuang 050043 China Structural Health Monitoring and Control Institute Shijiazhuang Tiedao University Shijiazhuang 050043 China

Wheel out-of-roundness (OOR) inevitably jeopardizes the safety of railway operations. Regular visual inspection and checking by experienced workers are the commonly adopted practices to identify wheel defects. However, the defects may not be spotted in time. The paper puts forward a new method to real-time monitor wheel OOR based on PVDF strain sensor. Track strain response upon wheel-rail interaction is measured and processed to generate a condition index which directly reflects the wheel condition. Firstly, theoretical model of relationship between PVDF sensor output and wheel/rail loads is set up, and principle for measuring vertical wheel/rail contact forces is proposed. Secondly, the effects of horizontal wheel/rail force and train speed on the output results are discussed. Finally, this approach is verified by finite element analysis, and the preliminary results show that this electromagnetic-immune system provides an effective alternative for wheel defects detection. © Song et al.

关键词： Finite element method

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A novel fiber bragg grating temperature compensated strain sensor

A novel fiber bragg grating temperature compensated strain s...

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1st International Conference on Intelligent Networks and Intelligent Systems, ICINIS 2008

作者： Du, Yanliang Li, Jianzhi Liu, Chenxi Key Laboratory of Structural Health Monitoring and Control Shijiazhuang Railway Institute shijiazhuang 050043 China

ISBN: (纸本)9780769533919

This paper analyzed the strain-temperature cross-sensitive characteristic of optical fiber Bragg grating (FBG) theoretically, designed and made a novel FBG strain sensor. It has a temperature-compensated function, and it improves the effect of being sensitive to strain. To a certain extent, this sensor overcame the traditional temperature-compensated methods easy to have a creep and aged phenomenon. The experimental results show that the sensor realized the temperature sensitivity reduces to 1/10 before the seal, and the strain sensitivity increases to 1.4pm/μΕ over the temperature range from -10C to 50C. © 2008 IEEE.

关键词： Thermal expansion

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Life cycle detection of prestress in large prestressed reinforcement structures

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Journal of Central South University 2005年第S2期14卷 90-94页

作者：金秀梅杜彦良孙宝臣 School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing 100044 China Structural Health Monitoring and Control Institute Shijiazhuang Railway Institute Shijiazhuang 050043 China

To monitor the stress state of prestressed reinforcement in large reinforcement prestressed structure, two sensing structures, namely the direct spiral-winding structure and sawtooth modulated structure, were designed based on the ordinary communication optical fiber. The sensing theories were analyzed, and the experimental studies were also carried out. The quasi-distributed sensing system based on optical time domain reflective technology was established. The detection wavelength and spatial resolution were analyzed, and the estimation formula of maximal number of sensing point was also given. The results show that the system can realize the quasi-distributed test of measurand with single fiber, which helps to simplify the in-out wires. Moreover it can take on the important task of long-term and continuous monitoring of prestress, which helps to realize the life cycle detection of prestress, and play an important role in the estimating of bridge health state.

关键词： life cycle detection smart structure prestress optical fiber quasi-distribution

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Conception and Exploration of Using Data as a Service in Tunnel Construction with the NATM

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Engineering 2018年第1期4卷 123-130页

作者： Bowen Du Yanliang Du Fei Xu Peng He State Key Laboratory of Software Development Environment Beihang University Beijing 100083 China Structural Health Monitoring and Control Institute Shijiazhuang Tiedao University Shijiazhuang 050043 China Research Center of Geotechnical and Structural Engineering Shandong University Jinan 250061 China

The New Austrian Tunneling Method （NATM） has been widely used in the construction of mountain tun- nels, urban metro lines, underground storage tanks, underground power houses, mining roadways, and so on, The variation patterns of advance geological prediction data, stress-strain data of supporting struc- tures, and deformation data of the surrounding rock are vitally important in assessing the rationality and reliability of construction schemes, and provide essential information to ensure the safety and scheduling of tunnel construction, However, as the quantity of these data increases significantly, the uncertainty and discreteness of the mass data make it extremely difficult to produce a reasonable con- struction scheme; they also reduce the forecast accuracy of accidents and dangerous situations, creating huge challenges in tunnel construction safety, In order to solve this problem, a novel data service system is proposed that uses data-association technology and the NATM, with the support of a big data environ- ment, This system can integrate data resources from distributed monitoring sensors during the construc- tion process, and then identify associations and build relations among data resources under the same construction conditions, These data associations and relations are then stored in a data pool, With the development and supplementation of the data pool, similar relations can then he used under similar con- ditions, in order to provide data references for construction schematic designs and resource allocation, The proposed data service system also provides valuable guidance for the construction of similar projects.

关键词： New Austrian Tunneling Method Big data environments Data as a service Tunnel construction

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Correlation processing of the signals of the single-fiber intermode interferometer with a small number of excited modes

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Key Engineering Materials 2008年 381-382卷 627-630页

作者： Kulchin, Y.N. Vitrik, O.B. Lantsov, A.D. International Joint Laboratory of Optical Techniques for Structural Health Monitoring Institute of Automation and Control Processes Far Eastern Branch of Russian Academy of Sciences 690041 Vladivostok Russia

Possibilities of obtaining quantitative information about the deformation influence on the SFMI with a small number of excited modes by using a correlation method are investigated. It was shown that usage of diffusive scatterer allows us to transform the radiation of SFMI to a speckle field which can easily be processed. The working range of the SFMI deformation measurements is 0 - 160 μm with precision up to 10 μm.

关键词： Correlation methods

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A new monitoring method of cable tension of cable-stayed bridge—fiber Bragg grating method

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Journal of Central South University 2005年第S2期14卷 261-263页

作者：张戌社杜彦良宁辰校 College of Electric and Mechanical Engineering Hebei University of Science and Technology Shijiazhuang 050054 China Structural Health Monitoring and Control Institute Shijiazhuang Railway Institute Shijiazhuang 050043 China

A new on-line monitoring method based on fiber Bragg grating(FBG) for cable tension of cable-stayed bridge was introduced. The major structure of sensing head using in the test of cable tension is elastic annular. The FBG is attached inflexibility to the exterior surface of annulus and form straight-through sensing head. Sensing head is installed between the anchor device and stow-board of funiculus holes of the cable-stayed bridge. Accompany with the change of the outside pressure, the Bragg center reflective wavelength of optical fiber grating changed correspondingly. According to this characteristic, through demodulating the Δλ, the value of the cable tension can be determined. The experiment results and the theory indicate that the test system has simple structure, good stability and linear,wide response capacity, and has no special request for tester, The measurement method for the test of cable tension is practical and effective.

关键词： bridge cable tension fiber Bragg grating

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