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Dominant pulse simulation of near fault ground motions

Earthquake Engineering and Engineering Vibration 2013年第2期12卷 267-278页

作者： s.r. hoseini vaez M.K. sharbatdar G. Ghodrati Amiri H. Naderpour A. Kheyroddin Department of Civil Engineering Faculty of EngineeringUniversity of Qom Faculty of Civil Engineering Semnan University Center of Excellence for Fundamental studies in s.r.ctural Engineering School of Civil EngineeringIran University of Science and Technology

In this study, a new mathematical model is developed composed of two parts, including harmonic and polynomial expressions for simulating the dominant velocity pulse of near fault ground motions. Based on a proposed velocity function, the corresponding expressions for the ground acceleration and displacement time histories are also derived. The proposed model is then fitted using some selected pulse-like near fault ground motions in the Next Generation Attenuation （NGA） project library. The new model is not only simple in form but also simulates the long-period portion of actual velocity near fault records with a high level of precision. It is shown that the proposed model-based elastic response spectra are compatible with the near fault records in the neighborhood of the prevailing frequency of the pulse. The results indicate that the proposed model adequately simulates the components of the time histories. Finally, the energy of the proposed pulse was compared with the energy of the actual record to confirm the compatibility.

关键词： dominant pulse near fault ground motions forward directivity response spectra simulation

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Physical properties of solid fuel briquettes from bituminous coal waste and biomass

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Journal of Coal science & Engineering(China) 2011年第4期17卷 434-438页

作者： ZArrINGHALAM-MOGHADDAM A GHOLIPOUr-ZANJANI N DOrOsTI s vaez M Chemical Engineering Department Tarbiat Modares University Tehran *** Iran

Biomass and bituminous coal fines from four different coalfields were used to produce fuel briquettes. Two physical properties of briquettes, water resistance index and compressive s.r.ngth were analyzed. The influence of type and quantity of biomass on physical properties was also studied. The results.r.veal that depending on the mineral content of the coal, the physical properties of the briquettes differ noticeably. The comparison of briquettes with and without biomass showed that the presence of the beet pulp increased Cs in all types of coal samples. samples containing beet pulp had better physical properties than sawdust. Mezino II coal briquettes had highest Cs and WrI than the other ones. Calorific value of biomass/Mezino II coal briquettes was lessened in comparison with raw coal, but it remained in an acceptable range.

关键词：生物质型煤物理性质生物质能固体燃料烟煤化学性质废物矿物质含量

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Defending Davidson＇s Anti-skepticism Argument： A reply to Otavio Bueno

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Journal of Philosophy study 2017年第11期7卷 595-600页

作者： Mohammad reza vaez shahrestani University of Bonn

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Multiobjective Optimization of Air-Core Linear Permanent Magnet synchronous Motors for Improved Thrust and Low Magnet Consumption

Multiobjective Optimization of Air-Core Linear Permanent Mag...

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2005国际电机与系统学术会议

作者： s.vaez-Zadeh A. Hassanpour Isfahani Advanced Motion systems.r.search Laboratory Department of Electrical and Computer Engineering University of TehranNorth Kargar AvenueP.O. Box 14395/515TehranIRAN Advanced Motion systems.r.search Laboratory Department of Electrical and Computer Engineering University of TehranNorth Kargar AvenueP.O. Box 14395/515TehranIRAN

＜正＞In this paper a multiobjective design optimization of an air-core linear permanent magnet synchronous motor is presented. Thrust, thrust ripple and consumed magnet volume are chosen as objectives for design opti...

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sens.r.ess Vector Control of single-Phase Induction Motor Drives

Sensorless Vector Control of Single-Phase Induction Motor Dr...

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2005国际电机与系统学术会议

作者： s.vaez-Zadeh sh.reicy H. Advanced Motion system Lab. Dep. of Electrical and Computer EngineeringFaculty of EngineeringUniversity of TehranTehranIran IR Advanced Motion system Lab. Dep. of Electrical and Computer EngineeringFaculty of EngineeringUniversity of TehranTehranIran IR

＜正＞ sINGLE-PHAsE Induction Motors （sPIMs） are being increasingly used in applications with variable speed requirement. A reliable motor speed signal is usually needed for speed control and advanced torque control in such applications. The use of a mechanical sens.r.for speed meas.r.ment is not a wise option because of its high cost relative to the motor *** this paper a speed estimation method is proposed for sPIMs using the rotor voltage vector defined in the complex domain. The estimated speed signal is then used in a novel sens.r.ess vector control sPIM drive. Extensive simulation results validate the effectiveness of the proposed control system.

关键词： Index terms-single-Phase Induction Motors Vector control speed estimation sens.r.ess control.

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