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雷达天线座车车架风载响应分析 被引量:3
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作者 李建华 马力 宋发宝 《工程与试验》 2010年第3期28-30,共3页
建立了雷达天线座车车架有限元分析模型,并对雷达天线座车系统风压中心风速时程数值进行模拟,得到脉动风荷载时程样本。随后对车架进行模态分析和风载响应分析,得出车架在风荷载作用下的变形量和应力分布情况,为雷达天线座车在风荷载作... 建立了雷达天线座车车架有限元分析模型,并对雷达天线座车系统风压中心风速时程数值进行模拟,得到脉动风荷载时程样本。随后对车架进行模态分析和风载响应分析,得出车架在风荷载作用下的变形量和应力分布情况,为雷达天线座车在风荷载作用下车架的设计提供依据。 展开更多
关键词 风载响应 风荷载 模态分析 雷达天线座车
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吊斗铲三角架风载响应分析 被引量:1
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作者 关丽坤 郑兴兰 闫淑君 《矿山机械》 北大核心 2012年第8期12-15,共4页
通过ANSYS软件建立吊斗铲三角架模型,对其进行模态分析和风载响应分析,求出结构的基本振型。计算不同风荷载作用下,三角架的变形和应力分布情况,并找出危险点。将各级风载作用下的结果与无风荷载时进行比较可知,变形及应力随着风级的增... 通过ANSYS软件建立吊斗铲三角架模型,对其进行模态分析和风载响应分析,求出结构的基本振型。计算不同风荷载作用下,三角架的变形和应力分布情况,并找出危险点。将各级风载作用下的结果与无风荷载时进行比较可知,变形及应力随着风级的增大而增大。 展开更多
关键词 吊斗铲 三角架 模态分析 风载响应 风荷载
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太阳能板支架体系等效静力风荷载响应分析 被引量:1
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作者 刘春雨 白冰 李腊梅 《山西建筑》 2017年第27期45-47,共3页
太阳能结构受风荷载影响较大,而目前对风载研究较少。以常见的展厅式太阳能板结构为研究对象,将风荷载作为等效静力荷载,采用有限元法对其进行结构建模及风载响应分析,得出了在等效静力风荷载作用下结构各处的位移和应力值,将结构在各... 太阳能结构受风荷载影响较大,而目前对风载研究较少。以常见的展厅式太阳能板结构为研究对象,将风荷载作为等效静力荷载,采用有限元法对其进行结构建模及风载响应分析,得出了在等效静力风荷载作用下结构各处的位移和应力值,将结构在各工况下的位移和应力相比较,得出风荷载对结构的影响,为太阳能结构的设计提供参考。 展开更多
关键词 太阳能板 风载响应 等效静力风荷载 有限元分析
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拱形充气结构承载特性分析 被引量:1
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作者 王中成 马云鹏 《工程建设与设计》 2018年第16期1-2,10,共3页
为了验证充气结构的承载特性,进行了气肋模块荷载试验,得到了同一模块在不同内压下的承载极限以及拱顶高度的变化量,内压为5kPa时,气肋模块最大可承重1 760kg。建立了充气机库的三维模型,并用FLUENT计算了不同迎风角下,机库表面风压分布... 为了验证充气结构的承载特性,进行了气肋模块荷载试验,得到了同一模块在不同内压下的承载极限以及拱顶高度的变化量,内压为5kPa时,气肋模块最大可承重1 760kg。建立了充气机库的三维模型,并用FLUENT计算了不同迎风角下,机库表面风压分布,得到在迎风角为60°时,为机库最易坍塌,并将表面风压导入ABAQUS中分析机库应力分布,结果表明,机库在10级风下仍能运行良好。 展开更多
关键词 充气结构 有限元方法 雪载试验 风载响应 迎风角
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Passive control of along-wind response of tall building 被引量:2
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作者 KIM Young-moon YOU Ki-pyo YOU Jang-youl 《Journal of Central South University》 SCIE EI CAS 2014年第10期4002-4006,共5页
Most of modern tall buildings using lighter construction materials with high strength and less stiffness are more flexible, which occurs excessive wind-induced vibration, resulting in occupant discomfort and structura... Most of modern tall buildings using lighter construction materials with high strength and less stiffness are more flexible, which occurs excessive wind-induced vibration, resulting in occupant discomfort and structural unsafety. It is necessary to predict wind-induced vibration response and find out a method to mitigate such an excessive wind-induced vibration at the preliminary design stage. Recently, many studies have been conducted in using actuator control force based on the linear quadratic optimum control algorithm. It was accepted as a common knowledge that the performance of passive tuned mass damper(TMD) could increase by incorporating a feedback active control force in the design of TMD, which is called active tuned mass damper(ATMD). However, the fact that ATMD is superior to TMD to reduce wind-induced vibration of a tall building is still a question. The effectiveness of TMD for mitigating the along-wind vibration of a tall building was investigated. Optimum parameters of tuning frequency and damping ratio for TMD under a random load which has a white noise spectra were used. Fluctuating along-wind load acting on a tall building treated as a stationary Gaussian random process was simulated numerically using the along-wind load spectra. And using this simulated along-wind load, along-wind responses of a tall building with and without TMD were calculated and the effectiveness of TMD in mitigating the along-wind response of a tall building was found out. 展开更多
关键词 tuned mass damper(TMD) along-wind vibration tall building
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Wind-induced responses of super-large cooling towers 被引量:3
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作者 柯世堂 葛耀君 +2 位作者 赵林 陈少林 Y.Tamura 《Journal of Central South University》 SCIE EI CAS 2013年第11期3216-3228,共13页
Traditional gust load factor(GLF)method,inertial wind load(IWL)method and tri-component method(LRC+IWL)cannot accurately analyze the wind-induced responses of super-large cooling towers,so the real combination formula... Traditional gust load factor(GLF)method,inertial wind load(IWL)method and tri-component method(LRC+IWL)cannot accurately analyze the wind-induced responses of super-large cooling towers,so the real combination formulas of fluctuating wind-induced responses and equivalent static wind loads(ESWLSs)were derived based on structural dynamics and random vibration theory.The consistent coupled method(CCM)was presented to compensate the coupled term between background and resonant response.Taking the super-large cooling tower(H=215 m)of nuclear power plant in Jiangxi Province,China,which is the highest and largest in China,as the example,based on modified equivalent beam-net design method,the aero-elastic model for simultaneous pressure and vibration measurement of super-large cooling tower is firstly carried out.Then,combining wind tunnel test and CCM,the effects of self-excited force on the surface pressures and wind-induced responses are discussed,and the wind-induced response characteristics of background component,resonant component,coupled term between background and resonant response,fluctuating responses,and wind vibration coefficients are discussed.It can be concluded that wind-induced response mechanism must be understood to direct the wind resistant design for super-large cooling towers. 展开更多
关键词 super-large cooling towers wind-induced responses wind vibration coefficients aero-elastic model consistent coupled method
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Effects of sudden change in wind loads on running performance of trains on a highway-railway one-story bridge in crosswinds 被引量:1
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作者 HAN Yan LIU Ye +2 位作者 CAI Chun-sheng HU Peng HE Xu-hui 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第8期2621-2638,共18页
To investigate the effects of sudden change in wind loads on the running performance of trains on the bridge in crosswinds,a highway-railway one-story bridge was taken as the research object.Aerodynamic coefficients o... To investigate the effects of sudden change in wind loads on the running performance of trains on the bridge in crosswinds,a highway-railway one-story bridge was taken as the research object.Aerodynamic coefficients of the train and the bridge were measured in a series of train-bridge system segment models through wind tunnel tests when two trains passed each other on the bridge and when a train entered and left the wind barrier section of the bridge.Based on the improved SIMPACK and ANSYS rigid-flexible coupling simulation method,a wind-double train-track-bridge system coupled vibration model was established.The dynamic responses of the train were analyzed under the effects of sudden change in wind loads caused by two trains passing each other and a train entering and leaving the wind barrier section of the bridge.The results show that the effects of sudden wind load change caused by the trains passing each other had less effects on the running safety of the leeward-side train than the wind shielding effect caused by the windward-side train in the wind speed range of 10−25 m/s.With the decrease in the porosity of wind barriers,the effects of the sudden wind load change played an increasingly important role in the running safety and comfort of the train.With the increase in wind speed,the lateral response of the train increased obviously because of the effects of sudden wind load change,which affects both the lateral running stability and the comfort of the train. 展开更多
关键词 wind-train-track-bridge system two trains passing each other wind barrier sudden change in wind load dynamic response
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Numerical Simulation of the Spreading Dynamic Responses of the Multibody System with a Floating Base
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作者 Zhaobing Jiang Luzhong Shao Fei Shao 《Journal of Marine Science and Application》 CSCD 2015年第3期290-301,共12页
To simulate the dynamic responses of the multibody system with a floating base when the upper parts spread with a certain sequence and relative speed, the homogeneous matrix method is employed to model and simulate a ... To simulate the dynamic responses of the multibody system with a floating base when the upper parts spread with a certain sequence and relative speed, the homogeneous matrix method is employed to model and simulate a four-body system with a floating base and the motions are analyzed when the upper parts are spread sequentially or synchronously. The rolling, swaying and heaving temporal variations are obtained when the multibody system is under the conditions of the static water along with the wave loads and the mean wind loads or the single pulse wind loads, respectively. The moment variations of each joint under the single pulse wind load are also gained. The numerical results showed that the swaying of the floating base is almost not influenced by the spreading time or form when the upper parts spread sequentially or synchronously, while the rolling and the heaving mainly depend on the spreading time and forms. The swaying and heaving motions are influenced significantly by the mean wind loads. The single pulse wind load also has influences on the dynamic responses. The torque of joint 3 and joint 4 in the single pulse wind environment may be twice that in the windless environment when the system spreads with 60 s duration. 展开更多
关键词 multibody system Floating base spreading form dynamic response homogeneous matrix method wave load wind load
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A simplified model to predict blast response of CFST columns
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作者 ZHANG Jun-hao CHEN Bin JIANG Shi-yong 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第3期683-691,共9页
In order to study the dynamic response of concrete-filled steel tube(CFST) columns against blast loads,a simplified model is established utilizing the equivalent single-degree-of-freedom(SDOF) method,which considers t... In order to study the dynamic response of concrete-filled steel tube(CFST) columns against blast loads,a simplified model is established utilizing the equivalent single-degree-of-freedom(SDOF) method,which considers the non-uniform distribution of blast loads on real column and the axial load-bending moment(P-M) interaction of CFST columns.Results of the SDOF analysis compare well with the experimental data reported in open literature and the values from finite element modeling(FEM) using the program LS-DYNA.Further comparisons between the results of SDOF and FEM analysis show that the proposed model is effective to predict the dynamic response of CFST columns with different blast conditions and column details.Also,it is found that the maximum responses of the columns are overestimated when ignoring the non-uniformity of blast loads,and that neglecting the effect of P-M interaction underestimates the maximum response of the columns with large axial load ratio against close range blast.The proposed SDOF model can be used in the design of the blast-loaded CFST columns. 展开更多
关键词 concrete-filled steel tube (CFST) columns dynamic response single-degree-of-freedom (SDOF) analysis non-uniformblast loads axial load-bending moment (P-M) interaction
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3D wind-induced response analysis of a cable-membrane structure
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作者 Jun-jie LUO Da-jian HAN 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2009年第3期337-344,共8页
Wind loading is a dominant factor for design of a cable-membrane structure. Three orthogonal turbulent components, including the longitudinal, lateral and vertical wind velocities, should be taken into account for the... Wind loading is a dominant factor for design of a cable-membrane structure. Three orthogonal turbulent components, including the longitudinal, lateral and vertical wind velocities, should be taken into account for the wind loads. In this study, a stochastic 3D coupling wind field model is derived by the spectral representation theory. The coherence functions of the three orthogonal turbulent components are considered in this model. Then the model is applied to generate the three correlated wind turbulent components. After that, formulae are proposed to transform the velocities into wind loads, and to introduce the modified wind pressure force. Finally, a wind-induced time-history response analysis is conducted for a 3D cable-membrane structure. Analytical results indicate that responses induced by the proposed wind load model are 10%-25% larger than those by the con- ventional uncorrelated model, and that the responses are not quite influenced by the modified wind pressure force. Therefore, we concluded that, in the time-history response analysis, the coherences of the three orthogonal turbulent components are necessary for a 3D cable-membrane structure, but the modified wind pressure force can be ignored. 展开更多
关键词 Cable-membrane structures Time-history analysis COHERENCE Gust response factor
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