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| 1 | Design and performance analysis of position-based impedance control for an electrohydrostatic actuation system显示文摘Electrohydrostatic actuator(EHA) is a type of power-by-wire actuator that is widely implemented in the aerospace industry for flight control, landing gears, thrust reversers, thrust vector control, and space robots. This paper presents the development and evaluation of positionbased impedance control(PBIC) for an EHA. Impedance control provides the actuator with compliance and facilitates the interaction with the environment. Most impedance control applications utilize electrical or valve-controlled hydraulic actuators, whereas this work realizes impedance control via a compact and efficient EHA. The structures of the EHA and PBIC are firstly introduced. A mathematical model of the actuation system is established, and values of its coefficients are identified by particle swarm optimization. This model facilitates the development of a position controller and the selection of target impedance parameters. A nonlinear proportional-integral position controller is developed for the EHA to achieve the accurate positioning requirement of PBIC. The controller compensates for the adverse effect of stiction, and a position accuracy of 0.08 mm is attained.Various experimental results are presented to verify the applicability of PBIC to the EHA. The compliance of the actuator is demonstrated in an impact test. | Yongling FU Xu HAN Nariman SEPEHRI Guozhe ZHOU Jian FU Liming YU Rongrong YANG | 2018 | Chinese Journal of Aeronautics2018，31，3： | 10 |
| 2 | Assessment of digital image correlation method in determining large scale cemented rockfill strains显示文摘A conventional contact method(using linear transducers)and a non-contact method are deployed to measure the axial and lateral deformations of large scale cylindrical cemented rockfill specimens.Experimental works incorporating two pinhole cameras to create one stereovision by digital image correlation shows that the non-contact method is as reliable for testing large cylindrical specimens as measurements done by using linear variable displacement transformer and string potentiometer.Considering this particular large specimen,the experiment resulted in the acceptable mean difference between lateral strain using both methods is 5.1 percent,and 14.5 percent for the axial strain.This occurrence is inevitable due to the heterogeneity of the concrete system and the placement of the monitoring point in digital image correlation method,although the comparison of stress-strain relationship in both methods still indicates a conformity.Based on the results of the present experiments,the authors recommend the noncontact method for a detailed investigation of the material behavior during the uniaxial compressive strength tests.Full field strain measurement enables this digital method to examine local strains near cracks at any point,a very useful tool for studying material deformation behavior. | Bob A.Lingga Derek B.Apel Mohammadali Sepehri Yuanyuan Pu | 2019 | International Journal of Mining Science and Technology2019，29，5： | 4 |
| 3 | Numerical modeling for rockbursts:A state-of-the-art review显示文摘As the depth of excavation increases,rockburst becomes one of the most serious geological hazards damaging equipment and facilities and even causing fatalities in mining and civil engineering.This has forced researchers worldwide to identify different methods to investigate rockburst-related problems.However,some problems,such as the mechanisms and the prediction of rockbursts,continue to be studied because rockburst is a very complicated phenomenon influenced by the uncertainty and complexity in geological conditions,in situ stresses,induced stresses,etc.Numerical modeling is a widely used method for investigating rockbursts.To date,great achievements have been made owing to the rapid development of information technology(IT)and computer equipment.Hence,it is necessary and meaningful to conduct a review of the current state of the studies for rockburst numerical modeling.In this paper,the categories and the origin of different numerical approaches employed in modeling rockbursts are reviewed and the current usage of various numerical modeling approaches is investigated by a literature research.Later,a state-of-the-art review is implemented to investigate the application of numerical modeling in the mechanism study,and prediction and prevention of rockbursts.The main achievements and problems are highlighted.Finally,this paper discusses the limitations and the future research of numerical modeling for rockbursts.An approach is proposed to provide researchers with a systematic and reasonable numerical modeling framework. | Jun Wang Derek B.Apel Yuanyuan Pu Robert Hall Chong Wei Mohammadali Sepehri | 2021 | Journal of Rock Mechanics and Geotechnical Engineering2021，13，2： | 3 |
| 4 | Grain boundary structure and chemistry of Dy - diffusion processed Nd - Fe - B sintered magnets 显示文摘 | Sepehri - Amin H Ohkubo T Hono K | 2010 | J Appl Phys2010，107，09： | 1 |
| 5 | Neural network classifiers ap- plied to condition monitoring of a pneumatic process valve actuator显示文摘 | Karpenko M Sepehri N | 2002 | Engineering applications of artificial intelligence2002，15，： | 1 |
| 6 | Emotional learning based position control of pneumatic actuators显示文摘 | GARMSIRI N SEPEHRI N | 2014 | Intelligent automation&soft computing2014，20，3： | 1 |
| 7 | Design robust force control of hydraulic actuators despite system and environmental uncertainties显示文摘 | Niksefat N Sepehri N | 2001 | IEEE Control Systems Magazine2001，，4： | 1 |
| 8 | Hardware-in-the-loop sim- ulator for research on fault tolerant control of electrohydraulic actu- ators in a flight control application 显示文摘 | KARPENKO Mark SEPEHRI Narlman | 2009 | Mechatronics2009，19，7： | 1 |
| 9 | Single course of high dose dexamethasone is more effective than conventional prednisolone therapy in the treat- ment of primary newly diagnosed immune thrombocy- topenia显示文摘 | Mashhadi MA Kaykhaei MA Sepehri Z | 2012 | Daru2012，20，： | 1 |
| 10 | Study the antinociceptive effect of intracerebroventricularinjection of aqueous extract oi Origanum vulgareleaves in rat: possible involvement of opioid system显示文摘 | PAHLAVAN Y SEPEHRI G SHEIBANI V | 2013 | Iranian Journal of Basic Medical Sciences2013，16，10： | 1 |
| 11 | A data mining frame- work for detecting subscription fraud in telecommunication 显示文摘 | FARVARESH H SEPEHRI M M | 2011 | Engineering Applications of Artificial Intelligence2011，24，1： | 1 |
| 12 | The impact of atypical antipsychotic medications on long-term memory dysfunction in schizophrenia spectrum disorder:a quantitative review显示文摘 | Thornton AE Van Snellenberg JX Sepehry AA | 2006 | J Psychophar-macol2006，20，3： | 1 |
| 13 | The impact of atypical antipsyehotie medication on long term memory dysfunction in schizophrenia spectrum disorder: a quantitative re view显示文摘 | Thornton AE Van Snellenberg JX Sepehry AA | 2006 | J Psyehopharmacol2006，20，3： | 1 |
| 14 | The impact of atypical antipsychotic medication on long term memory dysfunction in schizophrenia spectrum disorder:a quantitative review显示文摘 | Thornton AE Van Snellenberg JX Sepehry AA | | 0，，03： | 1 |
| 15 | Polycondensation of new optically active diacid with diisocyanates in the presence of tetrabutylammonium bromide as a green media under microwave heating显示文摘 | Shadpour Mallakpour Saghi Sepehri | 2008 | Reactive and Functional Polymers2008，，10： | 1 |
| 16 | Tracking control of hydraulic actuators using a LuGre friction model compensation 显示文摘 | Zeng H Sepehri N | 2008 | Journal of Dynamic Systems Measurement and Control Transactions of the ASME2008，130，1： | 1 |
| 17 | Pattern of drug prescription and utilization among Barn residents during the first six months after the 2003 Barn earthquake显示文摘 | Sepehri G Meimandi MS | 2006 | Prehosp Disaster Med2006，21，6： | 1 |
| 18 | Polylactide-co-glycolide nanoparticles for controlled delivery of anticancer agents 显示文摘 | Dinarvand R Sepehri N Manoochehri S | 2011 | lnt J Nanomedicine2011，，6： | 1 |
| 19 | Comparing effects of ket- amine and thiopental administration during eleetroeonvulsive therapy in patients with major depressive disorder: a randomized, double- blind study 显示文摘 | Yoosefi A Sepehri AS Kargar M | 2014 | J ECT2014，30，1： | 1 |
| 20 | The impact of atypical antipsychotic medications on long-term memory dysfunction in schizophrenia spectrum disorder:a quantitative review显示文摘 | Thornton AE Van Snellenberg JX Sepehry AA | 2006 | J Psychopharmacol2006，20，3： | 1 |
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