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长春光学精密机械与物... [2]
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会议论文 [2]
发表日期
2010 [2]
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发表日期:2010
专题:长春光学精密机械与物理研究所
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Nonlinear analysis method for predicting optical surface deformations resulted from assembly process (EI CONFERENCE)
会议论文
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, April 26, 2010 - April 29, 2010, Dalian, China
Dong W.
;
Yong Y.
;
Guang J.
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提交时间:2013/03/25
There are three main nonlinear elements in the large mirror assemblies
which are screw pretension
adhesive stress and state changes in the assembly process. The optical shape will be influenced seriously by these factors. But the impacts will not be shown in linear analysis results
because as the simplification
these factors have been ignored. The nonlinear analysis method for predicting optical surface deformations resulted from assembly process is discussed in detail. Take a typical mirror support structure for example
the nonlinear analysis model was established. Comparing the calculation results with the optical shape test
it is illustrated that nonlinear analysis is more accurate and closer to the test result. And according to the simulation result
the bowl-shaped depression which was discovered in the test can also be explained reasonably. 2010 Copyright SPIE - The International Society for Optical Engineering.
Position servo control of a DC electromotor using a hybrid method based on model reference adaptive control (MRAC) (EI CONFERENCE)
会议论文
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
Guo R.
;
Chen J.
;
Hao X.
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提交时间:2013/03/25
This paper dealed with position control problems of a DC motor servo system that had nonlinear friction and was subject to parametric uncertainties
external disturbances
etc. In order to overcame those unfavourable factors mentioned above
a model reference adaptive control method was proposed to regulate the important and main speed loop in the positioning system which was designed with three closed control loop
where a compensatory measure was given so as to counterbalance the friction torque disturbances. In addition
the other two close loops were built in adjusting the position and the current of the servo system respectively that aimed to achieve the fast and precise positioning and increase dynamic stiffness against load disturbances. Experimental results illustrate satisfactory performances in steady state error
load capability
high rapidity and so on. 2010 IEEE.
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