Precision Control for Sextupole Magnet Yoke in Designing and Manufacturing

2017 ◽  
Author(s):  
Chang-jun Ning ◽  
Chang-dong Deng ◽  
Lei Liu ◽  
Yong-ji Yu ◽  
Hua-yan He ◽  
...  
Keyword(s):  
Precision Control ◽  
Magnet Yoke

Precast Pavement Smoothness Control Method

2014 ◽  
Vol 587-589 ◽  
pp. 1071-1074 ◽  
Author(s):  
Peng Peng ◽  
De Fen Wu ◽  
Bo Tian ◽  
Kai Min Niu
Keyword(s):  
Control Method ◽  
Control Measure ◽  
Road Maintenance ◽  
Precision Control ◽  
Service Effectiveness ◽  
Base Course

In the course of road maintenance, importance has been gradually attached by administrative authorities to precast pavement for its advantages like quickness, endurance and eco-friendliness. To ensure the smoothness of precast pavement, analyses and researches were done in terms of, say, precast pavement slab precision control, base course treatment, fabricated pavement slab leveling and treatment of joint faulting, and a control measure to ensure and improve the smoothness of precast pavement is suggested with consideration given to its service effectiveness in actual projects.

Experimental Demonstration of Precision Control of a Deployable Optics Structure

2002 ◽  
Vol 124 (3) ◽  
pp. 441-450 ◽  
Author(s):  
R. Scott Erwin ◽  
Karl Schrader ◽  
Ruth L. Moser ◽  
Steven F. Griffin
Keyword(s):  
Control System ◽  
Structural Control ◽  
Level Control ◽  
Precision Control ◽  
Research Issues ◽  
Optical Surfaces ◽  
Point Tracking ◽  
High Bandwidth ◽  
And Performance ◽  
System 1

This paper presents the development, design, and implementation of a precision control system for a large, sparse-aperture space-deployable telescope testbed. Aspects of the testbed and laboratory environment relevant to nanometer-level control and performance objectives are provided. There are four main objectives of the control system: 1) reduction of natural resonances of the supporting structure, 2) rejection of tonal disturbances, 3) tip, tilt, and piston set-point tracking for optical surfaces, and 4) reduction in settling time of optical surfaces after an impulsive slew-type disturbance. The development of a three-input, three-output, high-bandwidth structural control system for the testbed is presented, and experimental data demonstrating that all objectives were attained is provided. The paper concludes with a discussion of the results and a description of research issues remaining to be addressed.

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