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长春光学精密机械与物... [4]
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会议论文 [4]
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2012 [1]
2011 [2]
2010 [1]
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专题:长春光学精密机械与物理研究所
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Deep subwavelength electromagnetic transparence through dual metallic gratings with ultranarrow slits (EI CONFERENCE)
会议论文
2012 International Workshop on Metamaterials, Meta 2012, October 8, 2012 - October 10, 2012, Nanjing, China
Qiu C.
;
Li S.
;
Chen R.
;
Hou B.
;
Li F.
;
Liu Z.
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  |  
浏览/下载:20/0
  |  
提交时间:2013/03/25
We study the transmission response of microwaves through two identical metallic plates perforated with periodical ultranarrow slits. The experimental and numerical transmission spectra consistently display a striking transmission peak at wavelength much larger than any characteristic length of the microstructure (e.g.
about 20-fold of the lattice constant)
which can not be directly interpreted by the existing mechanisms. Both the LC-circuit-based microscopic picture and the effective-medium-based macroscopic model are established to capture the essential physics behind such unexpected resonance at the deep subwavelength scale. 2012 IEEE.
The effect of backlash nonlinear on resonance frequency of electric actuator transmission system (EI CONFERENCE)
会议论文
3rd IEEE International Conference on Advanced Computer Control, ICACC 2011, January 18, 2011 - January 20, 2011, Harbin, China
Han X.
;
Ge M.
;
Bai Y.
;
Jia H.
;
Ge W.
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  |  
浏览/下载:14/0
  |  
提交时间:2013/03/25
In order to study the effect of backlash nonlinear on resonance frequency of electric actuator transmission system
then
Finally
in the premise of meeting the stability
the dynamic equilibrium equation of transmission system with backlash is established
it makes dynamic simulation analysis for the transmission system based on virtual prototype technology
it establishes balanced equation of dynamics system with backlash
the effect of backlash on system natural frequency and resonance frequency
and the theoretical values and simulation values are compared. Theoretical analysis and simulation results show that the theoretical analysis is basically consistent with simulation results when it is zero backlash
and does some theory research and dynamic analysis of backlash nonlinearity and system natural frequency and resonance frequency. First
and the error of theoretical analysis and simulation results is within 10%. Therefore
according to describing function to theoretically model the backlash nonlinear
it can be concluded that considering the transmission system theoretical analysis of backlash nonlinearity is feasible
the relation between describing function and the amount of backlash and input amplitude is analyzed
and it is much closer to the actual system with instructive significance. 2011 IEEE.
Research on computer control strategy for optical electric tracking system (EI CONFERENCE)
会议论文
2011 IEEE International Conference on Mechatronics and Automation, ICMA 2011, August 7, 2011 - August 10, 2011, Beijing, China
Li M.
;
Gao H.
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浏览/下载:18/0
  |  
提交时间:2013/03/25
In this paper
mathematic model and computer control strategy for optical electrical tracking system have been researched and discussed. First
the system's structure and its work process have been analyzed. Second
according to the system's moving law
the system's mathematic model has been built. As to the computer control strategy
trigger guiding
two closed loop PID control method as well as compound control method have been applied to satisfy the tracking accuracy. Third
we apply the bilinear transformation to get the digital system
and the sample time is 800Hz. The simulation results indicate that the maximum tracking error can be limited to less than 0.5 and the regulator time can be 0.04s. Then the control project resonance frequency should be more than 200Hz and the sample frequency should be more than 400Hz to meet the control accuracy requirement. So we can conclude that the system indexes such as swiftness
high accuracy as long as real time have been satisfied. And the requirement of mechanical property has been present which is very useful to mechanical working. 2011 IEEE.
Nonlinear control design for system with mechanical resonance based on two tracking-differentiators (EI CONFERENCE)
会议论文
2010 IEEE International Conference on Mechatronics and Automation, ICMA 2010, August 4, 2010 - August 7, 2010, Xi'an, China
Huang P.
;
Ge W.
;
Li J.
;
Xiu J.
;
Li Y.
;
Chen L.
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  |  
浏览/下载:14/0
  |  
提交时间:2013/03/25
A nonlinear control strategy for controlling a motion system with mechanical resonance is presented in this paper. A mathematical model of the servo system is derived according to the parameters of an actual system. By using two Tracking-Differentiators
reference input and system output are tracked and their differential signals are given simultaneously. A nonlinear PD control law in velocity loop is designed based on non-smooth feedback. The simulation results show that the control law is superior remarkably in performance to linear PD control law and the classical PID control law. Tracking-Differentiator resolves the contradiction between rapidity and overshoot of system response. The nonlinear PD control law improves system dynamic performance and intensifies the ability of disturbance rejection. The control design achieved in this paper makes the servo system more robust. 2010 IEEE.
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