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CAS IR Grid
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长春光学精密机械与物... [2]
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OAI收割 [2]
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会议论文 [2]
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2011 [1]
2009 [1]
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内容类型:会议论文
专题:长春光学精密机械与物理研究所
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Structure buckling load interval analysis of supercavitating projectile (EI CONFERENCE)
会议论文
OAI收割
2011 9th International Conference on Reliability, Maintainability and Safety: Safety First, Reliability Primary, ICRMS'2011, June 12, 2011 - June 15, 2011, Guiyang, China
作者:
Zhou L.
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提交时间:2013/03/25
As a result of supercavitating projectiles with high underwater velocity
their structures undergo high longitudinal force. It is necessary to perform structure buckling load interval analysis because the uncertainty of structural own parameters should be considered. Critical buckling load of supercavitating projectiles is calculated by Galerkin method. The partial matrixes of critical buckling load implicit function to each uncertainty variable are deduced
and the interval of structure critical buckling load is calculated by interval analysis and convex model methods. Numerical results show that the nominal value
lower and upper bounds of critical buckling load increase with the increment of the ratio of base diameter to cavitator diameter. And the uncertainty degree of basic variables should be controlled as far as possible in the project for high reliability. 2011 IEEE.
Estimation algorithm of mobile OFDM CFOs based on step-size (EI CONFERENCE)
会议论文
OAI收割
2009 International Conference on Information Engineering and Computer Science, ICIECS 2009, December 19, 2009 - December 20, 2009, Wuhan, China
Lin L.
;
Qiao Y.-F.
;
Su W.-X.
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提交时间:2013/03/25
In order to maintain orthogonality among subcarriers for mobile OFDM
a CFOs step-size estimation model is established to avoid severe performance degradation caused by ICI
and algorithmic stability
step-size parameter
the error of CFOs estimate and etc are investigated. First
after an averaging window algorithm is introduced
the mathematic model of step-size estimation algorithm is obtained through step-size parameter and time-varying CFOs. Then
based on the results of MATLAB simulation
the determination of step-size parameter
the advantages of step-size algorithm and precision are discussed. Finally
time sequence plots of added CP
interleaver and subcarrier modulation with VHDL are presented. Experimental results indicate that the maximum of CFOs errors is 0.00987 in 3 variance interval
when mobile velocity is 400 km/h
according with verdicted principle that in order for the ICI effects to be negligible
the error of CFOs estimation must be accurate within 1-2% of the subcarrier spacing
and programs can correctly implement on circuit board. 2009 IEEE.