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Effect of fatigue load on the bending tribo-corrosion-fatigue behaviors between the main cable wires

Friction 2024年第7期12卷 1512-1531页

作者： Bo WANG Dagang WANG Jihong YE Liang TANG Hailang CHONG Wei XU Xinxin ZHANG Jianhao CHEN Haiyan DENG Jie ZHANG Guowen YAO Magd Abdel WAHAB School of Mechatronic Engineering China University of Mining and TechnologyXuzhou 221116China Xuzhou Key Laboratory for Fire Safety of Engineering Structures China University of Mining and TechnologyXuzhou 221116China National Wire Rope Quality Inspection Center Nantong Product Quality Supervision and Inspection InstituteNantong 226011China Jiangsu Langshan Wire Rope Co. Ltd.Nantong 226003China School of Mechatronic Engineering Southwest Petroleum UniversityChengdu 610500China School of Civil Engineering Chongqing Jiaotong UniversityChongqing 400074China Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityZwijnaarde B-9052Belgium

The main cable bent around the saddle of the suspension bridge is subjected to the wind,the vehicle,the bridge’s own weight and the corrosive *** coupling of the three loads and the environments causes the friction,the corrosion,and the fatigue(tribo-corrosion-fatigue)among the wires inside the main *** this paper,a wire bending tribo-corrosion-fatigue test rig was designed and *** effect of fatigue load on the bending friction behaviors between the cable wires in ultrapure water and 3.5%NaCl solution was *** tribological properties and electrochemical corrosion behaviors under different fatigue loading ranges were *** tribo-corrosion-fatigue interaction between the cable wires was quantitatively characterized,and the mechanism of the interaction was *** results demonstrate that the increasing fatigue load exacerbates the coupling damage of the cable wires attributed to the enhanced *** findings carry theoretical importance when assessing the main cable’s deterioration and the load-bearing safety of a suspension bridge.

关键词： bending tribo-corrosion-fatigue interaction parallel steel wires fatigue load

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The Transport Properties of Concrete under the Simultaneous Coupling of fatigue load and Environment Factors

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Journal of Wuhan University of Technology(Materials Science) 2012年第1期27卷 181-186页

作者： WANG Caihui SUN Wei JING Jinyang HAN Jiande R0NG Hui School of Materials Science and Engineering Southeast University Jiangsu Key Laboratory of Construction Materials

A set of coupling experimental instrument was designed to study the transport properties of chloride ion in concrete under simultaneous coupling action of fatigue load and environmental factors. Firstly the water-saturated performance of modem concrete was investigated, then diffusion performance of chloride ion under different stress levels and different temperature were studied respectively; meanwhile, the time- dependent behavior of the chloride ion diffusion in concrete was also researched. The results showed that the saturation degree of concrete can reach as high as 99%. Besides, diffusion coefficient of chloride ion increased with increasing of the stress level and temperature, and when the stress level and temperature are at 0.6 and 60 ℃ respectively, the diffusion coefficient is 6.3 ×10 -14 m2/s, moreover the diffusion coefficient of chloride ion in concrete decreased with time under the simultaneous coupling action of fatigue load and environment factors.

关键词： chloride diffusion fatigue load concrete stress level temperature time dependent

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Chloride Ion Transport in Fly Ash Mortar under Action of fatigue loading

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Journal of Wuhan University of Technology(Materials Science) 2012年第6期27卷 1165-1171页

作者：王彩辉孙伟 School of Materials Science and Engineering Southeast UniversityNanjing211189China

In order to study the chloride ion transport performance in fly ash addition mortar, a new method, in which the fatigue loading and chloride diffusion are undertaken simultaneously, was developed. This method realizes coupling the fatigue damage process and the process of chloride transporting of fly ash mortar. The transport performance of chloride in fly ash mortar specimens was studied under different stress levels. Moreover, the effect of fly ash content on transport performance of chloride ion in mortar was investigated. AE （Acoustic Emission） and SEM were used to acquire the damage distribution of mortar specimens under action of fatigue load. The results show that the diffusion coefficient of chloride in mortar specimens increases with stress level of fatigue loading. The addition of fly ash can mitigate the penetration of chloride ion. The results of microcmck 3D location acquired by AE, accompanied with crack characterizing from SEM, indicate that the damage degree of mortar specimen increases with stress level of fatigue loading. Furthermore, higher damage degree of mortar leads to more the chloride ion content in the sample.

关键词： new method fatigue load fly ash mortar chloride transport AE

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Smart load control of the large-scale offshore wind turbine blades subject to wake effect

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Science Bulletin 2015年第19期60卷 1680-1687页

作者： Mingming Zhang Bin Tan Jianzhong Xu Institute of Engineering Thermophysics Chinese Academy of Sciences

The smart fatigue load control of a large-scale wind turbine blade subject to wake effect was numerically investigated in this paper. The performances were evaluated and compared at selected typical wind speeds within the whole operational region under three turbine layout strategies, i.e., column, row and array arrangements, together with a single turbine case as reference, utilizing our newly developed aero-servo-elastic platform. It was observed that not only the blade fatigue loads but the stabilities of power and collective pitch angle were effectively controlled for all cases, especially at the highest studied hub velocity of20 m/s, leading to the averaged reduction percentages in the standard deviations of the flapwise root moment, the flapwise tip deflection and the root damage equivalent load, of about 30.0 %, 20.0 % and 20.0 %, respectively. Furthermore, the control effectiveness gradually lessened in the sequences of single, column, row and array cases, with successively increasing effective turbulence intensity,within regions II and III. The performances in region III,associated with the impaired flow separation on the blade by the effective pitching action, were much better than those in region II, related to enhanced flow detachment. In addition,at the rated wind velocity, the control for the array case was superior over other three cases, which was thought to be originated from the more pitch activities to impair the uncontrolled flow separation on the blade surface.

关键词： Smart rotor control Offshore wind energy fatigue load Wake effect Turbine layout strategy

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Independent Pitch Control Strategy and Simulation for Reducing Unbalanced load of Wind Turbine

Independent Pitch Control Strategy and Simulation for Reduci...

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第32届中国控制与决策会议

作者： Xiuyan Wang Zhihong Jiang Hong Lu Xiumei Wang Yu Meng Shengnan Li Department of Energy and Power Engineering Changchun Institute of Technology Yalong River Company Ertan Hydropower Plant

With the progress and development of socio-economic technology, the contradiction between the strong demand for energy in various industries and the increasing shortage of traditional petrochemicals is deepening. People are increasingly aware of the importance of developing renewable energy, especially the use and development of wind energy. Pitch control is the core technology of wind power generation. At present, most of the mainstream products in the international wind power market apply centralized variable pitch control. The advantage of centralized pitch control is that it has a high wind energy utilization coefficient, which can ensure the maximum power in the low wind speed section, the rated power in the high wind speed section, improve the starting performance and braking performance of the wind turbine, improve the overall flexibility of the wind turbine, Force conditions of small machines and blades. Independent pitch control technology is a control technology method developed in recent years with the continuous increase of fan capacity and the constant increase of impeller *** paper takes the wind energy conversion system of large doubly-fed induction generators as the research object, proposes an independent pitch control strategy, uses FAST and MATLAB/Simulink for dynamic modeling, simulation and comprehensive analysis. The results of simulation experiments show that The unbalanced load of wind turbine units is an effective control method to improve the power supply quality and extend the service life of wind turbine units.

关键词： Wind turbine Independent Pitch fatigue load Control Strategy

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