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长春光学精密机械与... [56]
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专题:长春光学精密机械与物理研究所
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Structural design of primary mirror subassembly for space telescope (EI CONFERENCE)
会议论文
2nd International Conference on Mechatronics and Applied Mechanics, ICMAM 2012, December 8, 2012 - December 9, 2012, Taiwan
Xu H.
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浏览/下载:48/0
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提交时间:2013/03/25
In order to design a large aperture primary mirror with the diameter of 1150 mm
the parameters impacting on gravity deformation of the mirror were analyzed and discussed in detail
including material selection
diameter-thickness ratio
the number of the support points
location selection and lightweight structure
etc. A novel space mirror structure system was put forward
and its back was opened and supported by six points on back. The dynamic and static and thermal characteristics were analyzed based on the finite element method. Analysis results showed the surface figure accuracy reached to RMS 14.5nm under the action of gravity load along the optical axis direction and the first-order natural frequency was 214Hz which met to the designed indexes requirements. (2013) Trans Tech Publications
Switzerland.
Error analysis of the micro temperature control system (EI CONFERENCE)
会议论文
2012 International Conference on Measurement, Instrumentation and Automation, ICMIA 2012, September 15, 2012 - September 16, 2012, Guangzhou, China
Han Z.
;
Song K.
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浏览/下载:43/0
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提交时间:2013/03/25
In order to improve the measurement accuracy of optical detection instruments
temperature control circuits for narrow band-pass filters are given
and the error analysis is applied to temperature control circuits.The principle of a temperature measurement circuit is studied and the method of a driver circuit is described. A variety of influencing factors of temperature control accuracy are discussed. Moreover
for these error factors
improvement measures are given to reduce the nonlinear error. Finally
circuit parameter error is quantified to propose a calculation method for margin of error in a temperature control system. (2013) Trans Tech Publications
Switzerland.
Structural design of large aperture rectangular mirror for space telescope (EI CONFERENCE)
会议论文
2nd International Conference on Civil Engineering and Transportation, ICCET 2012, October 27, 2012 - October 28, 2012, Guilin, China
Li Z.
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浏览/下载:27/0
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提交时间:2013/03/25
Structural design of large aperture mirror is one of the key technologies for space telescope development. To meet the requirements of high stiffness
strength and thermal dimensional stability
some factors such as support scheme
materials selection
lightweight design and flexible support design were taken into account. The three supports location of the mirror was determined according to the modal analytical solution. By adjusting the parameters of flexure hinge
influences of gravity
assembly stress and thermal stress on the mirror were reduced obviously. Finite element analysis (FEA) results indicate that the surface accuracy reach to rms10.2nm and 10.8nm under the gravity along optical axis direction and 5C uniform temperature rise respectively
the fundamental frequency of the mirror component is 268Hz. Dynamics test shows that the first order natural frequency is 256Hz
which shows an error less than 5% compared to FEA results. (2013) Trans Tech Publications
Switzerland.
Stray light analysis of solar photoelectric detection system on space target (EI CONFERENCE)
会议论文
2012 International Conference on Intelligent System and Applied Material, GSAM 2012, January 13, 2012 - January 15, 2012, Taiyuan, Shanxi, China
Li L.-Y.
;
Wang Y.-F.
;
San X.-G.
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浏览/下载:134/0
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提交时间:2013/03/25
Most conventional spacious solar photoelectric detection systems suffer from unexpected stray light. This paper demonstrates the effects on photoelectric detection system bring out by stray light. On this foundation
build up evaluation index of stray light system
to search the reasonable programme to eliminating stray light. A detailed telescope system geometry model was created
and scatter models were create for telescope and enclosure components. By the means of designing the structure of main baffle
baffle vane and the coating technology. In order to verify the prosperity of structure that designed
we utilizes software to analysis opto-mechanical model. we utilizes software to analysis opto-mechanical model. The simulations show that point source transmittance of the system is thus reduced by up to two orders of magnitude between 10-8 and 10-10. Meanwhile
the experiment obtains clean detection data which satisfies the system requirements. Stray light has been suppressed effectually
and so measurement precision was improved from detection graphics. (2012) Trans Tech Publications.
Immersed nanospheres super-lithography for the fabrication of sub-70nm nanoholes with period below 700nm (EI CONFERENCE)
会议论文
2012 12th IEEE International Conference on Nanotechnology, NANO 2012, August 20, 2012 - August 23, 2012, Birmingham, United kingdom
Li S.
;
Shi L.
;
Yang Z.
;
Huang X.
;
Zhang Z.
;
Gao F.
;
Guo Y.
;
Yu W.
;
Du J.
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浏览/下载:129/0
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提交时间:2013/03/25
A maskless nano-lithography method by using polystyrene spheres (PSs) self-assembled on silver slab (NSSL) was proposed in [optics express
Vol. 16
No. 19 (2008) 14397]. Following that
to break the limitations in resolution and PSs period of NSSL method
in this paper
we present PSs immersed super-resolution lithography (NSISL) technology by embedding the PSs into appropriate material to improve the efficiency of the surface plasmon excitation. The energy modulating mechanism and the rules of the resolution affected by silver slab were studied by calculating and analysing the energy distribution. The curve of the lithography resolution versus the silver thickness was presented. In order to verify this method
contrast analysis was carried out with NSSL. The results show that the lithography resolution is improved efficiently. Taking a specific configuration with PS diameter of 600nm as an example
the resolution was improved to 54nm from 190nm with Ag thickness of 25nm. Based on the calculation results
we carried out the experiments. Nano holes with dimension of 75nm and period of 600nm were obtained. 2012 IEEE.
Lightweight design of large scale theodolite's turntable based on topology optimization of continuum structure (EI CONFERENCE)
会议论文
2012 International Conference on Optoelectronics and Microelectronics, ICOM 2012, August 23, 2012 - August 25, 2012, Changchun, China
San X.
;
Wang Y.
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浏览/下载:22/0
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提交时间:2013/03/25
In order to solve the problem that the weight of large scale theodolite's casting or steel plate welded structure is too heavy
lightweight design of large scale turntable based on topology optimization of continuum structure is investigated. Topology optimization could have better optimization efficiency because it can provide the optimized distribution of material and gain optimized structure in conceptual design phase of the structural design. In order to obtain lightweight and high stiffness structure
a truss turntable based on topology optimization of continuum structure is presented
and the validity of this lightweight structure is examined by finite element analysis. Comparing to the traditional welding steel turntable
the lightweight turntable
without changing the static displacement
can lose 386.48 kg(lightweight ratio is 26.7%)
and its first-order natural frequency raises from 167.02Hz to 173.71Hz. Meanwhile
in other aspects this turntable also has better performance than traditional structure. 2012 IEEE.
Research on the torque characteristic of disc micromotor on axial magnetic field (EI CONFERENCE)
会议论文
2012 2nd International Conference on Consumer Electronics, Communications and Networks, CECNet 2012, April 21, 2012 - April 23, 2012, Three Gorges, China
Liu B.
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浏览/下载:47/0
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提交时间:2013/03/25
In order to increase the electromagnetic torque density of micromotor with axial magnetic field
numerical analysis of permanent magnetic field and electromagnetic torque were deduced and the key factors of increasing torque density of micromotor was obtained. The numerical analysis of three-dimensional magnetic field in air gap produced by spliced sector permanent magnetic poles is done
and the way of improving flux density and permanent magnet use efficiency are given through investigating the influence of magnet thickness
height of air gap and pole interval rate and other parameters to air gap flux density and leakage flux. Based on the test of axial magnetic field and torque characteristic of micromotor
the analysis of micromotor magnetic field and calculation of torque are verified
meanwhile using the plane stator with 0.7mm thickness assemble micromotor having minimum air gap height of 1mm and its torque constant up to 3.8mNm/A. 2012 IEEE.
Research on load-bearing characteristics of precision air-bearing rotary stage (EI CONFERENCE)
会议论文
3rd international Conference on Manufacturing Science and Engineering, ICMSE 2012, March 27, 2012 - March 29, 2012, Xiamen, China
Lin J.
;
Wang L.
;
Gao M.
;
Ran T.
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浏览/下载:105/0
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提交时间:2013/03/25
Air-bearing is a core component of air-bearing rotary stage. The weakness that the air-bearing has the low load capacity and stiffness has been concerned about by domestic and foreign scholars. So how to improve the load capacity and stiffness has become a serious problem. In order to improve the load capacity and stiffness of the air-bearing rotary stage
in this paper
we improved structure of Zhang Wenjie and others' high-precision direct-drive air-bearing rotary stage. The gas film of air-bearing has been meshed by GAMBIT software
and we use FLUENT software to obtain the carrying capacity features of the gas film. Finally
the structural static force of the precision air-bearing rotary stage will be analyzed by ANSYS software. The analysis results show that: the structural design of the precision air-bearing rotary stage is reasonable
and this structure can provide a larger range of loads. Even in heavy load conditions
a larger deformation will not occur any more. It has a good practical value
and also can be widely used in high precision equipments. (2012) Trans Tech Publications.
Reliable attitude stability control of quad-rotor based on fault-tolerant approach (EI CONFERENCE)
会议论文
2012 9th IEEE International Conference on Mechatronics and Automation, ICMA 2012, August 5, 2012 - August 8, 2012, Chengdu, China
Gong X.
;
Peng C.
;
Tian Y.
;
Bai Y.
;
Zhao C.
;
Gao Q.
;
Xu Z.
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浏览/下载:30/0
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提交时间:2013/03/25
The reliability flight property has received much attention within the aircraft control community throughout the last decades. In this paper
the fault-tolerant control technique is introduced into the attitude stability control system of a quadrotor UAV in order to compensate the influence of the actuators fault of the aircraft. This control scheme is composed of two components: a robust fault detection module using the modelbased observation approach and a reconfigurable controller. Besides the designing procedure
the theoretical analysis of robustness and stability of the designed FTC scheme are also contained in this article. And finally
the availability of the proposed scheme is verified through numerical simulation. 2012 IEEE.
Thermal-optical analysis for optical window under high Mach flight condition (EI CONFERENCE)
会议论文
2012 International Conference on Optoelectronics and Microelectronics, ICOM 2012, August 23, 2012 - August 25, 2012, Changchun, China
Zhong C.
;
Ding Y.
;
Fu J.
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浏览/下载:14/0
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提交时间:2013/03/25
When the airborne platform
where installed the optical window
is in high Mach flight condition. The aerodynamic heating effect
which will influence optical properties of optical window
becomes very obvious. This special flight condition will change shape
refractive index and also refractive index distribution of optical window due to the generated high axial temperature gradient. To ensure image quality of aerial remote sensor
the present paper does thermal-optical analysis for optical window under high Mach flight condition. Then
on this basis
do simulations according to theoretical analysis and boundary conditions derived from practical assumptions in order to get the final conclusions. 2012 IEEE.
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