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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 positionand attitude tracking is presented.

Keywords： telescope five-hundred end-effector controller simulation

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Drive system design and error analysis of the 6 degrees of freedom segment erector of shield tunneling machine

Hu SHI, Guofang GONG, Huayong YANG

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 3, Pages 369-376 doi: 10.1007/s11465-011-0223-1

Abstract: The perturbation method in the error analysis is introduced to establish the position and attitude errorDynamic simulations are carried out to obtain the controlling precision of electrohydraulic drive systemsFormulas for calculating the position and attitude error of the grip hand of the segment erector are

Keywords： shield tunneling machine segment erector kinematics position and attitude precision

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Air-bearing position optimization based on dynamic characteristics of ultra-precision linear stages

CHEN Xuedong, LI Zhixin

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4, Pages 400-407 doi: 10.1007/s11465-008-0060-z

Abstract: Air-bearings are installed between the stator and the mover of ultra-precision linear stages to suppresscharacteristics including mode frequency, mode shape, and response amplitude are obviously changed with the positionThe combined optimization method is used to optimize the air-bearings position.The method can be generalized to the connection position of different components in manufacture elementsand to implement the system dynamic characteristics optimization when the connection position can be

Keywords： manufacture different interaction air-bearings response amplitude

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Electrorheological damper for the ultra-precision air bearing stage

ZHU Yu, JIA Songtao, CHEN Yaying, LI Guang

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 2, Pages 158-163 doi: 10.1007/s11465-008-0031-4

Abstract: paper illustrates how the electrorheological damper substantially improves the performance of the ultra-precisionMeanwhile, the ultra-precision air bearing stage driven by the linear-motor is characterized by zeroof the electrorheological damper, which takes effect only when the stage is going to decelerate or positionresults prove that by using the advanced sliding mode control method, the characteristics of the ultra-precision

Keywords： post-yield linear-motor advanced sliding pre-yield position

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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: an appropriate control method, linear ultrasonic motors can be used in applications requiring high positionIn this paper, a closed loop PI control system is designed to achieve high position accuracy during theThe 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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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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Robust energy-efficient train speed profile optimization in a scenario-based position–time–speed network

Frontiers of Engineering Management 2021, Volume 8, Issue 4, Pages 595-614 doi: 10.1007/s42524-021-0173-1

Abstract: Specifically, we first construct a scenario-based position–time–speed (PTS) network by considering resistance

Keywords： robust train speed profile percentile reliability model scenario-based position–time–speed network

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Analyzing the Effect of the Intra-Pixel Position of Small PSFs for Optimizing the PL of Optical Subpixel Article

Haiyang Zhan, Fei Xing, Jingyu Bao, Ting Sun, Zhenzhen Chen, Zheng You, Li Yuan

Engineering 2023, Volume 27, Issue 8, Pages 140-149 doi: 10.1016/j.eng.2023.03.009

Abstract: With unavoidable imaging noise, there is a precision limit when estimating the target positions on imageon the detected photon count, noise, point spread function (PSF) radius, and PSF’s intra-pixel positionbut have neglected the intra-pixel position information.position of small PSFs.This work provides a new perspective on combining image sensor position control with PSF engineering

Keywords： Optical measurement Subpixel localization Precision limit optimization Small point spread functions

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Strategic position and development prospects of nuclear energy in China

SHEN Wenquan

Frontiers in Energy 2007, Volume 1, Issue 2, Pages 125-128 doi: 10.1007/s11708-007-0015-9

Abstract: By analyzing the challenges of China s energy supply, an excellent perspective of nuclear power development in the country has been described. Taking into account the near-, mid-, and long-term development requirements, a comprehensive, coordinated and sustainable nuclear power program is proposed. Thus, our national nuclear industry can not only catch up with the world s advanced level in proper time, but also possess enough stamina for sustainability.

Keywords： development excellent perspective long-term development comprehensive national

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Do not let precision medicine be kidnapped

Zhiping Yang

Frontiers of Medicine 2015, Volume 9, Issue 4, Pages 512-513 doi: 10.1007/s11684-015-0425-8

Abstract:

Obama’s precision medicine initiative made the medical community boil over after the initiativePrecision medicine has been advocated by the majority of scientists and doctors.This article does not oppose precision medicine.However, the incentive of vigorously promoting precision medicine at present is a concern.

Keywords： precision medicine personalized medicine genomics

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Review on the progress of ultra-precision machining technologies

Julong YUAN, Binghai LYU, Wei HANG, Qianfa DENG

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 2, Pages 158-180 doi: 10.1007/s11465-017-0455-9

Abstract:

Ultra-precision machining technologies are the essential methods, to obtain the highest form accuracyThe conception, applications and history of ultra-precision machining are introduced in this article,and the developments of ultra-precision machining technologies, especially ultra-precision grinding,ultra-precision cutting and polishing are also reviewed.

Keywords： ultra-precision grinding ultra-precision cutting ultra-precision polishing research status in China development

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Trajectory planning and base attitude restoration of dual-arm free-floating space robot by enhanced bidirectional

Zongwu XIE1 , Xiaoyu ZHAO1 , Zainan JIANG1 , Haitao YANG2 , Chongyang LI1

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 1, doi: 10.1007/s11465-021-0658-y

Abstract: When free-floating space robots perform space tasks, the satellite base attitude is disturbed by thebidirectional approach is proposed to plan the manipulator trajectory and eliminate the final base attitudeSimulations are carried out in the end, and the proposed method is validated in minimizing final base attitude

Keywords： free-floating space robot dual arm coordinated operation base attitude restoration bidirectional

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Self-generation of machining precision and its realization in lapping of super precision solid balls

ZHANG Bopeng

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 3, Pages 348-353 doi: 10.1007/s11465-008-0065-7

Abstract: This paper presents the principle of self-generation of machining precision by explaining its basic conceptThe self-generation of machining precision for solid balls with super precision is emphatically explainedNecessary conditions for achieving self-generation of machining precision are given.Establishment of the system for machining solid balls with super precision is discussed.Self-generation of machining precision for solid balls with super precision on the basis of the capability

Keywords： self-generation necessary self-regulation capability viewpoint Necessary

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Human pangenome: far-reaching implications in precision medicine

Frontiers of Medicine doi: 10.1007/s11684-023-1039-1

Abstract: Human pangenome: far-reaching implications in precision medicine

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The Possibility of Active Attitude Control for Fuel Spray Review

Masataka Arai

Engineering 2019, Volume 5, Issue 3, Pages 519-534 doi: 10.1016/j.eng.2019.04.010

Abstract: spray-to-spray interaction, spray-to-wall interaction, and air flow have potential as a basis for active attitudeThis article uses evidence from the literature to discuss the possibility of active spray attitude control

Keywords： Internal combustion engine Fuel spray Spray control Spray behavior Fuel injector