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长春光学精密机械与物... [5]
清华大学 [3]
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Calculation method of spatial configuration of tube billet in roll forming process of a high strength steel drive shaft tube
期刊论文
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY, 2018, 卷号: 97, 期号: 9-12, 页码: 3339-3358
作者:
Zhang, Wendong
;
Zhao, Guoqun
;
Zhai, Zhen
;
Zhao, Chunfeng
;
Fu, Qianjin
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浏览/下载:10/0
  |  
提交时间:2019/12/11
High strength steel
Roll forming
Trajectory function method
Spatial
configuration
Springback
Reentry guidance based on parametric optimization (EI CONFERENCE)
会议论文
2012 International Conference on Mechatronics and Control Engineering, ICMCE 2012, November 29, 2012 - November 30, 2012, Guangzhou, China
Li D.
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浏览/下载:149/0
  |  
提交时间:2013/03/25
This paper presents a parametric optimization approach to solve reentry guidance. Due to the various constraints imposed on the trajectory
original guidance problem can be converted into an optimal control problem with a merit function to be minimized. Direct implementation of method of variation and is too complex to get a reasonable result
while a numerical parametric optimization approach is feasible and efficient if we choose appropriate control variables as the optimization parameters and effective optimization algorithm. A simulation of the approach is performed to show its validity on reentry guidance problem: as the value of merit function converges to acceptable threshold
all constraints are hold. (2013) Trans Tech Publications
Switzerland.
Modeling and variable structure control of a vehicle flexible manipulator (EI CONFERENCE)
会议论文
10th World Congress on Intelligent Control and Automation, WCICA 2012, July 6, 2012 - July 8, 2012, Beijing, China
Sxu Y.
;
Qiao Y.
;
Wang Z.
;
Liu K.
;
Li Y.
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浏览/下载:20/0
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提交时间:2013/03/25
In this paper
the mathematical modeling and the application of a new trajectory tracking control technique for hydraulic-driven rigid-flexible manipulator are concerned. To get a closer dynamic behavior of the real system
both the flexible manipulator linkage and the actuator dynamics are considered. The exact dynamic model of flexible manipulator is derived using Lagrange principle and assumed modes method. The partial decoupled dynamic equation is derived using nonlinear decoupling feedback control method. The whole dynamic model is established by a driven Jacobin matrix
which represents the coupling between hydraulic servo system and mechanical system. A variable structure controller with inverse dynamics is designed for trajectory tracking. To weaken the chattering of control signal
saturation function is used to instead of sign function. The experimental results investigate the effectiveness of the proposed approaches. 2012 IEEE.
Trajectory tracking control for mobile robot based on the fuzzy sliding mode (EI CONFERENCE)
会议论文
10th World Congress on Intelligent Control and Automation, WCICA 2012, July 6, 2012 - July 8, 2012, Beijing, China
Xie M.-J.
;
Li L.-T.
;
Wang Z.-Q.
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浏览/下载:23/0
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提交时间:2013/03/25
The trajectory tracking control problem of the uncertain mobile robot with nonholonomic constraints is analyzed. Sliding mode control is presented based on the kinematics models analysis. Switching function of sliding model control is designed according to back-stepping method. Trending law control is selected to improve the system dynamic performance. In order to solve the constant speed problem caused by conventional trending law control
fuzzy control is used to adjust trending speed in the real time. The simulation results demonstrate that the fuzzy sliding mode controller improves the rapidity of trajectory tracking
and reduces the tracking error and the chattering of the control output. 2012 IEEE.
Optimal trajectory generation for spacecraft formation flying reconfiguration
会议论文
Proceedings of the SPIE - The International Society for Optical Engineering, International Conference on Space Information Technology, Wuhan, China, INSPEC
Chenguang Zhang
;
Bin Li
;
Darong Chen
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浏览/下载:7/0
Optimal trajectory planning of a flexible dual-arm space robot with vibration reduction
期刊论文
2010, 2010
Hao Wu
;
Fuchun Sun
;
Zengqi Sun
;
Licheng Wu
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浏览/下载:2/0
Two-staged motion planning approach combined with predict simulation
期刊论文
2010, 2010
Tang Huabin
;
Wang Lei
;
Sun Zengqi
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浏览/下载:2/0
Modular aircraft simulation platform based on simulink (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
Chen C.-Q.
;
Ji Y.
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浏览/下载:20/0
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提交时间:2013/03/25
Aircraft simulation platform is the most important supporting technology in the aircraft development process. This simulation platform can be used for validating the design of subsystem and also it provides the necessary data for the Aircraft design. Wind has great impact on the flight parameter. In order to accurately simulate the wind model and calculate the flight parameters
a simulation modeling method for flight parameter simulation platform under wind field environment is established. Firstly
the various sub-systems which affecting flight parameters are analyzed
some mathematical models of the flight parameter simulation platform is established. Secondly
the atmospheric wind field is studied to analyze the impact on its trajectory. Then the model is built in the Simulink toolbox in the Matlab which is based on the principles of hierarchy and modularity
using C MEX S-function for the complex kinetic equations. Finally
when the models have been established
encapsulating models for several subsystem and assembling them for the Aircraft simulation platform based on the unified interface. The simulation tests (including the performance test of a certain gliding Aircraft
the wind influence test of a certain uncontrolled aircraft) prove the simulation capability of the platform
and its calculating step can reach 1 ms. Comparing simulation with field test data of a certain uncontrolled aircraft
it shows that the relative deviation of range is 0.47%
the relative deviation of maximal altitude is 2.1%. Taking relevant standards as a reference standard
it is demonstrated the platform is reliable
meets the engineering accuracy requirements. 2010 IEEE.
Modulation transfer function in seeker camera limits resulting from missile flutter caused by aerodynamic force (EI CONFERENCE)
会议论文
2010 2nd International Conference on Industrial Mechatronics and Automation, ICIMA 2010, May 30, 2010 - May 31, 2010, Wuhan, China
Ai X.
;
Zhang X.
;
Jiang Z.
;
Wei Q.
;
Jia H.
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浏览/下载:25/0
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提交时间:2013/03/25
The imaging quality of seeker in flight mode has been evaluated through analyzing the effects of missile flutter on optical modulation transfer function (MTF) of the optical system. Firstly the data of transverse vibration has been processed to eliminate the trend term caused by the trajectory
then obtained the displacement with two times trapezoidal integration. For the side rotation
the high frequency noise interference in the data has been filtered by using five-point moving average method. Took this model as the quivering rule between the object and the image
and then analyzed the effects of the transverse vibration and the side rotation on imaging quality through MTF. By calculation
the r.m.s value of the image motion caused by missile transverse vibration is 0.026mm
and the side rotation angle is 0.0044 . Through the establishment of two modulation transfer functions (MTF) of image random vibration and linear vibration
the results show that the image quality had declined
and the effect of transverse vibration on image quality is obvious. Through improving the rigidity of the missile and selection of small focal length optical system and shorten the time of exposure can improve the imaging quality of the seeker. 2010 IEEE.
The characteristics of O+HD (v = 0, j = 0)reaction dynamics
期刊论文
Chinese Physics.B, 2009, 卷号: 第18卷, 页码: P167-173
作者:
Luo Wen-Lang
;
Ruan Wen
;
Zhang Li
;
Zhu Zheng-He
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浏览/下载:4/0
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提交时间:2019/02/28
O+HD molecular reaction dynamics analytical potential energy function (APEF) quasi-classical trajectory (QCT) method
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