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Quantitative feedback controller design and test for an electro-hydraulic position control system in Article

Xiong-bin PENG, Guo-fang GONG, Hua-yong YANG, Hai-yang LOU, Wei-qiang WU, Tong LIU

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 10,   Pages 1624-1634 doi: 10.1631/FITEE.1601104

Abstract: For the primary mirror of a large-scale telescope, an electro-hydraulic position control system (EHPCSThe EHPCS helps the telescope improve imaging quality and requires a micron-level position control capabilityIn this paper, we propose a robust closed-loop design for the position control system in a primary hydraulicThe control system is synthesized based on quantitative feedback theory.from the test rig for the primary mirror support system, showing the effectiveness of the proposed control

Keywords： Large-scale reflecting telescope     Quantitative feedback theory     Electro-hydraulic position control system     Micron-level position control capability     System identification     Robust stability    

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Task-space position/attitude tracking control of FAST fine tuning system

QI Lin, ZHANG Hui, DUAN Guanghong

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4,   Pages 392-399 doi: 10.1007/s11465-008-0056-8

Abstract: This paper addresses the task-space position/attitude tracking control of a suspended parallel robot,the quaternion algebra, a novel model-independent task-space PD controller that ensures end-effector positionThe simulation and experimental results show that the new controller has better control effects than

Keywords： telescope     five-hundred     end-effector     controller     simulation    

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System engineering for water pollution control at the watershed level in China

Wei MENG,

Frontiers of Environmental Science & Engineering 2009, Volume 3, Issue 4,   Pages 443-452 doi: 10.1007/s11783-009-0037-0

Abstract: The present water pollution situation at watershed level in China has been systematically analyzed.The problems of water pollution control at watershed level include a lack of thought and approach, developmentalFrom 2006 to 2020, water pollution control and governance will be a national key specific project ofThe strategies of this project include establishing a water pollution control system at watershed level, river pollution control, urban water environmental pollution control, potable water safety, and water

Keywords： water pollution control     watershed     system engineering     sustainability     integrated watershed management     key    

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Precision control system of two-DOF stage with linear ultrasonic motor

ZHANG Hanlei, SHI Yunlai, ZHAO Chunsheng

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4,   Pages 421-425 doi: 10.1007/s11465-008-0063-9

Abstract: Using an appropriate control method, linear ultrasonic motors can be used in applications requiring highposition accuracy.In this paper, a closed loop PI control system is designed to achieve high position accuracy during thecontrol of a two-DOF stage driven by linear ultrasonic motors.The PI control algorithm is used to increase the stability and accuracy of position control.

Keywords： settling     position accuracy     PI control     control algorithm     orthogonal    

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Preparation and crystallization kinetics of micron-sized Mg(OH)

Xingfu SONG, Kefeng TONG, Shuying SUN, Ze SUN, Jianguo YU

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 2,   Pages 130-138 doi: 10.1007/s11705-013-1332-7

Abstract: In this paper, micron-sized magnesium hydroxide with high purity, large particle size and low water content

Keywords： magnesium hydroxide     precipitation     micron-sized     crystallization kinetics    

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Water-level based discrete integrated dynamic control to regulate the flow for sewer-WWTP operation

Zhengsheng Lu, Moran Wang, Mingkai Zhang, Ji Li, Ying Xu, Hanchang Shi, Yanchen Liu, Xia Huang

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 3, doi: 10.1007/s11783-020-1222-4

Abstract: A model-free sewer-WWTP integrated control was proposed.A dynamic discrete control based on the water level was developed.A discretized water level control model was developed to conduct the real-time control based on data-automationThe discretized water level control method can regulate dynamic wastewater pumping flow of pumps followingthe dynamic water level variation in the sewer system.

Keywords： Sewer system     Integrated control     Discrete control     Water level    

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Optimal Robust Control of AC Position Servo System for Multiple Rockets

Chai Huawei,Ma Dawei,Li Zhigang,Le Guigao,Wang Feng

Strategic Study of CAE 2007, Volume 9, Issue 10,   Pages 83-87

Abstract:

In order to realize high speed and high precision position control inof inertia and load moment changing widely,  and strong impact moment,  an optimal robust control Experimental results show that this control tactics has strong robustness,  and has fairly

Keywords： rocket mortar     AC position servo system     robust control     optimal control    

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Fault-tolerant control of an open-winding brushless doubly-fed wind power generator system with dualthree-level converter

Shi JIN, Long SHI, Sul ADEMI, Yue ZHANG, Fengge ZHANG

Frontiers in Energy 2023, Volume 17, Issue 1,   Pages 149-164 doi: 10.1007/s11708-020-0711-2

Abstract: To improve the fault redundancy capability for the high reliability requirement of a brushless doubly-fedgeneration system applied to large offshore wind farms, the control winding of a brushless doubly-fedConsequently, the two ends of the control winding are connected via dual three-phase converters for theTherefore, a novel fault-tolerant control strategy based on the direct power control scheme is broughtThe fault-tolerant control strategy proposed enables the open-winding brushless doubly-fed reluctance

Keywords： open-winding     brushless doubly-fed reluctance generator (BDFRG)     direct power control     fault-tolerant control     multi-level converter     wind power    

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Decoration of CdMoO micron polyhedron with Pt nanoparticle and their enhanced photocatalytic performance

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 12,   Pages 1949-1961 doi: 10.1007/s11705-023-2360-6

Abstract: This study aimed to prepare and apply a novel Pt/CdMoO4 composite photocatalyst for photocatalytic N2 fixation and tetracycline degradation. The Pt/CdMoO4 composite was subjected to comprehensive investigation on the morphology, structure, optical properties, and photoelectric chemical properties. The results demonstrate the dispersion of Pt nanoparticles on the CdMoO4 surface. Close contact between CdMoO4 and Pt was observed, resulting in the formation of a heterojunction structure at their contact region. Density functional theory calculation and Mott-Schottky analysis revealed that Pt possesses a higher work function value than CdMoO4, resulting in electron drift from CdMoO4 to Pt and the formation of a Schottky barrier. The presence of this barrier increases the separation efficiency of electron-hole pairs, thereby improving the performance of the Pt/CdMoO4 composite in photocatalysis. When exposed to simulated sunlight, the optimal Pt/CdMoO4 catalyst displayed a photocatalytic nitrogen fixation rate of 443.7 μmol·L‒1·g‒1·h‒1, which is 3.2 times higher than that of pure CdMoO4. In addition, the composite also exhibited excellent performance in tetracycline degradation, with hole and superoxide species identified as the primary reactive species. These findings offer practical insights into designing and synthesizing efficient photocatalysts for photocatalytic nitrogen fixation and antibiotics removal.

Keywords： photocatalytic N2 fixation     Pt/CdMoO4     tetracycline degradation     Schottky barrier    

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Unified power quality conditioner based on a three-level NPC inverter using fuzzy control techniques

Salim CHENNAI,M-T BENCHOUIA

Frontiers in Energy 2014, Volume 8, Issue 2,   Pages 221-239 doi: 10.1007/s11708-014-0317-7

Abstract: This paper presents a novel and efficient control scheme for unified power quality conditioner (UPQC)based on three-level neutral point clamped (NPC) inverter using fuzzy logic techniques.The shunt and series APF reference signals derived from the control algorithm and sensed signals areTo improve the UPQC capability, fuzzy logic techniques are introduced to control the series APF.

Keywords： three-level neutral point clamped (NPC) inverter     unified power quality conditioner (UPQC)     current harmonics    

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A novel approach to minimizing material loss for computer numerical control flank-regrinding of worn

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 3, doi: 10.1007/s11465-023-0757-z

Abstract: is first generated by envelope theory to regrind the worn area with a four-axis computer numerical control

Keywords： flank-regrinding     worn end mill     wheel position and orientation     material loss     over-cut    

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Chord error constraint based integrated control strategy for contour error compensation

Tie ZHANG, Caicheng WU, Yanbiao ZOU

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 4,   Pages 645-658 doi: 10.1007/s11465-020-0601-7

Abstract: contour control accuracy in large curvature positions, an integrated control strategy of cross-couplingcompensation based on chord error constraint, which consists of a cross-coupling controller and an improved positionis proposed, which performs speed planning with the maximum feed rate allowed by the large curvature positionBesides, an improved position error compensation method is further presented by combining the feed rateregulator with the position error compensator, which improves the tracking accuracy via the advance

Keywords： cross-coupling controller     contour error     tracking error     position error compensator     feed rate regulator    

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Research on the key technology of level pre-assembly of steel tower segments

Zhang Yongli,Gu Bifeng

Strategic Study of CAE 2010, Volume 12, Issue 4,   Pages 48-52

Abstract:

In this paper, we researched the key technology of the level pre-assemblyenvironment effect, supporting conditions and the metal contact rate measures, we solved the problem of the controlLevel pre-assembly of steel tower fills the technology gaps in China and provides a strong basis for

Keywords： steel tower     level pre-assembly     support control     apply level force    

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API-based assessment on urban air environment bearing capability in China

Jinnan WANG,Jing ZHANG,Hongqiang JIANG,Yaling LU

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 6,   Pages 1049-1055 doi: 10.1007/s11783-014-0662-0

Abstract: By using this new method, the air environmental bearing capability of 333 cities at the prefecture levelThe results show that of the 333 cities 9.6% is of high bearing capability, 34.5% relatively high bearingcapability, 52.6% medium bearing capability, 2.7% low capability, and 0.6% is of weak bearing capabilityin terms of regional distribution, the western region is of relatively high air environment bearing capabilityagglomerations are of relatively high carrying capacity while other agglomerations are of medium bearing capability

Keywords： air pollution index (API)     air environment bearing capability     key city     assessment method    

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Experimental and CFD analysis of nozzle position of subsonic ejector

Xilai ZHANG, Shiping JIN, Suyi HUANG, Guoqing TIAN

Frontiers in Energy 2009, Volume 3, Issue 2,   Pages 167-174 doi: 10.1007/s11708-009-0001-5

Abstract: The influence of nozzle position on the performance of an ejector was analyzed qualitatively with freeExperimental investigations and computational fluid dynamics (CFD) analysis of the nozzle position ofThe results show that there is an optimum nozzle position for the ejector.Moreover, the nozzle position of an ejector is not a fixed value, but is influenced greatly by the flow

Keywords： ejector     nozzle position     ejecting coefficient     CFD    

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Title Author Date Type Operation

Quantitative feedback controller design and test for an electro-hydraulic position control system in

Xiong-bin PENG, Guo-fang GONG, Hua-yong YANG, Hai-yang LOU, Wei-qiang WU, Tong LIU

Journal Article

Task-space position/attitude tracking control of FAST fine tuning system

QI Lin, ZHANG Hui, DUAN Guanghong

Journal Article

System engineering for water pollution control at the watershed level in China

Wei MENG,

Journal Article

Precision control system of two-DOF stage with linear ultrasonic motor

ZHANG Hanlei, SHI Yunlai, ZHAO Chunsheng

Journal Article

Preparation and crystallization kinetics of micron-sized Mg(OH)

Xingfu SONG, Kefeng TONG, Shuying SUN, Ze SUN, Jianguo YU

Journal Article

Water-level based discrete integrated dynamic control to regulate the flow for sewer-WWTP operation

Zhengsheng Lu, Moran Wang, Mingkai Zhang, Ji Li, Ying Xu, Hanchang Shi, Yanchen Liu, Xia Huang

Journal Article

Optimal Robust Control of AC Position Servo System for Multiple Rockets

Chai Huawei,Ma Dawei,Li Zhigang,Le Guigao,Wang Feng

Journal Article

Fault-tolerant control of an open-winding brushless doubly-fed wind power generator system with dualthree-level converter

Shi JIN, Long SHI, Sul ADEMI, Yue ZHANG, Fengge ZHANG

Journal Article

Decoration of CdMoO micron polyhedron with Pt nanoparticle and their enhanced photocatalytic performance

Journal Article

Unified power quality conditioner based on a three-level NPC inverter using fuzzy control techniques

Salim CHENNAI,M-T BENCHOUIA

Journal Article

A novel approach to minimizing material loss for computer numerical control flank-regrinding of worn

Journal Article

Chord error constraint based integrated control strategy for contour error compensation

Tie ZHANG, Caicheng WU, Yanbiao ZOU

Journal Article

Research on the key technology of level pre-assembly of steel tower segments

Zhang Yongli,Gu Bifeng

Journal Article

API-based assessment on urban air environment bearing capability in China

Jinnan WANG,Jing ZHANG,Hongqiang JIANG,Yaling LU

Journal Article

Experimental and CFD analysis of nozzle position of subsonic ejector

Xilai ZHANG, Shiping JIN, Suyi HUANG, Guoqing TIAN

Journal Article