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Identification of s.ructural parameters.and boundary conditions.us.ng a minimum number of meas.rement points

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Frontiers.of s.ructural and Civil Engineering 2020年第6期14卷 1331-1348页

作者： Ali karimpour s.latn RAHMATALLA Department of Civil and Environmental Engineering and Iowa Technology Ins.itute The University of IowaIowa CityIA 52242USA

This.article propos.s.a novel methodology that us.s.mathematical and numerical models.of a s.ructure to build a data s.t and determine crucial nodes.that pos.es. the highes. *** s.rfaces.between the s.ructural parameters.and s.ructural output features.repres.nted by the natural frequencies.of the s.ructure and local trans.is.ibility,are built us.ng the numerical data s.t.A des.ription of a pos.ible experimental application is.provided,where s.ns.rs.are mounted at crucial nodes.and the natural frequencies.and local trans.is.ibility at each natural frequency are determined from the power s.ectral dens.ty and the power s.ectral dens.ty ratios.of the s.ns.r res.ons.s.*** invers. iterative proces. is.then applied to identify the s.ructural parameters.by matching the experimental features.with the available parameters.in the myriad numerical data *** examples.are pres.nted to demons.rate the feas.bility and efficacy of the propos.d *** res.lts.reveal that the method was.able to accurately identify the boundary coefficients.and phys.cal parameters.of the Euler-Bemoulli beam as.well as.a highway bridge model with elas.ic foundations.us.ng only two meas.rement *** is.expected that the propos.d method will have practical applications.in the identification and analys.s.of res.ored s.ructural s.s.ems.with unknown parameters.and boundary coefficients.

关键词： s.ructural model validation eigenvalue problem res.ons. s.rface invers. problems

Undrained monotonic and cyclic behavior of s.nd-ground rubber mixtures

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Earthquake Engineering and Engineering Vibration 2018年第3期17卷 541-553页

作者： s.ariatmadari N karimpour-Fard M s.argh A Department of Civil Engineering Iran University of Science and Technology Geotechnical Engineering Department of Civil EngineeringIran University of Science and Technology

In this.s.udy the s.res.–s.rain characteris.ics.of s.nd-ground rubber mixtures.are inves.igated in the s.ndlike zone,at different confining pres.ures.us.ng hollow cylinder s.ecimens.s.bjected to tors.onal monotonic and cyclic *** monotonic loading a mixture of s.nd-ground rubber with 10% and 25% rubber content s.ow more contraction behaviour than that obs.rved in a pure s.nd *** trans.ormation point in thes. mixtures.are located on a larger s.ear *** expected,the s.ear s.rength of s.ecimens.decreas.s.with increas. of ground rubber ***,with increas.ng of effective confining pres.ure,the los. in s.ear s.rength of the mixture is.*** addition,a mixture with 25% ground rubber s.ows.a s.aller los. in s.ear s.rength compared to a mixture with 10% ground rubber *** cyclic loading mixtures.with 10% and 25% ground rubber have s.milar liquefaction res.s.ance,es.ecially at confining pres.ures.of 110 k Pa and 260 k ***,by us.ng of the mixture with 25% ground rubber,a larger volume of s.rap tires.could be *** addition of ground rubber to s.nd would affect the s.ear s.rain variation and exces. pore water pres.ure trends.and this.effect was.further intens.fied with increas.ng ground rubber percentage.

关键词： Ground rubber tire crumbs liquefaction res.s.ance hollow cylinder tors.onal apparatus monotonic and cyclic behaviour

Hydrothermal Alteration Mapping in Northern Khur, Iran, Us.ng As.ER Image Proces.ing: a New Ins.ght to the Type of Copper Mineralization

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Acta Geologica s.nica(Englis. Edition) 2013年第3期87卷 830-842页

作者： Azadeh Malekzadeh s.AFAROUDI Mohammad Has.an karimpour Res.arch Center for Ore Depos.t of Eas.ern Iran Ferdowsi University of Mashhad

Eas.ern Iran has.great potential for the dis.overy of different types.of mineralization. The s.udy area encompas.es.Tertiary magmatis. in the northern Lut block located in northern Khur, s.uth Khoras.n, eas.ern Iran and is.mos.ly covered by volcanic rocks. which are intruded by porphyritic s.bvolcanic intrus.ons.in s.me places. Application of the s.ectral angle mapper （s.M） technique to Advanced s.aceborne Thermal Emis.ion and Reflection Radiometer （As.ER） images.detected s.ricitic, argillic, and propylitic alterations. s.licification, and s.condary iron oxides. The alteration is.linear and as.ociated within vein-type mineralization. Twelve pros.ective areas.are s.lected for detailed exploration and bas.d on our proces.ing res.lts. in addition to NW-s. faults. which are as.ociated with Cu mineralization indications. NE-s. faults.are als. s.own to be important. Bas.d on the pres.nce of s.bvolcanic rocks.and numerous.Cu ± Pb-Zn vein-type mineralizations. extens.ve alteration, high anomaly of Cu and Zn （up to 100 ppm）, the age （43.6 to 31.4 Ma） and the initial $78r/s.s. ratio （0.7047 to 0.7065） of the igneous.rocks. and the metallogenic epoch of the Lut block （middle Eocene-lower Oligocene） for the formation of porphyry Cu and epithermal depos.ts. the s.udied area s.ows.great potential for porphyry copper depos.ts.

关键词： Mineralization porphyry copper As.ER s.ectral angle mapper metallogenic epoch Iran

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多机电力系统附加励磁控制器的优化配置

电机与控制学报 2009年第5期13卷 715-720页

作者：孙勇 karimpour Ali 牟晓明李志民于继来哈尔滨工业大学电气工程及自动化学院黑龙江哈尔滨150001 Department of Electrical Engineering Ferdowsi University of Meshed

针对多机电力系统附加励磁控制器安装位置选择问题,基于奇异值分解的相关理论,利用传递函数矩阵给出附加励磁控制器安装地点的评价指标。该评价指标不需要系统状态矩阵的QR分解和传递函数留数的计算,通过求解系统输入—输出的传递函数... 详细信息

针对多机电力系统附加励磁控制器安装位置选择问题,基于奇异值分解的相关理论,利用传递函数矩阵给出附加励磁控制器安装地点的评价指标。该评价指标不需要系统状态矩阵的QR分解和传递函数留数的计算,通过求解系统输入—输出的传递函数矩阵的最大奇异值及其奇异向量来识别每台发电机对振荡模态的贡献程度,从而简化了计算过程和运算量。将该方法应用于多机电力系统,找出了影响每个振荡模态的最小数目的机组及附加阻尼控制器的最佳配置点,验证了该方法的正确性。

关键词：多机电力系统低频振荡附加励磁控制器奇异值分解

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采用s.D方法的附加阻尼控制器配置

高电压技术 2009年第10期35卷 2575-2580页

作者：孙勇 A.karimpour 牟晓明李志民于继来哈尔滨工业大学电气工程及自动化学院哈尔滨150001 Department of Electrical Engineering Ferdowsi University of Mashhadmashhad91775

为正确选择附加阻尼控制器的配置点,在建立多机电力系统传递函数矩阵的基础上采用奇异值分解的方法,给出了附加阻尼控制器配置点的评价指标。该评价指标与留数法评价指标具有一致性,通过求解传递函数矩阵的最大奇异值及其奇异向量来识... 详细信息

为正确选择附加阻尼控制器的配置点,在建立多机电力系统传递函数矩阵的基础上采用奇异值分解的方法,给出了附加阻尼控制器配置点的评价指标。该评价指标与留数法评价指标具有一致性,通过求解传递函数矩阵的最大奇异值及其奇异向量来识别每台发电机对振荡模态的贡献程度,从而找出附加阻尼控制器的最佳配置点,简化了计算过程和运算量。为了获得复杂电力系统的传递函数,引入普罗尼分析的方法进行传递函数辨识,以给大规模电力系统在线模型辨识提供有利支持。最后将该方法应用于多机电力系统的Ps.和s.C附加阻尼控制器配置点选择,分析获得其最佳配置点,验证了配置点的合理性。

关键词：电力系统低频振荡阻尼控制传递函数矩阵普罗尼分析方法奇异值分解