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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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2011 [2]
2009 [1]
2005 [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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Research on model reference sliding mode control in roll stabilization of aerocraft (EI CONFERENCE)
会议论文
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
Chu H.-R.
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浏览/下载:25/0
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提交时间:2013/03/25
Aimed at aerospace roll stabilization
control arithmetic based on model reference sliding mode variable structure theory and chattering reduction arithmetic are formulated. Correctness and validity of arithmetic are analyzed. With flight dynamics
the roll-loop mathematic model and reference model are established. Sliding hyperplane is deduced based on model reference sliding mode variable structure theory. Combing with reaching law
control law is derived
and stability of roll-loop is analyzed. Chattering of aileron instructions is alleviate by using boundary layer approach. Digital flying simulation result shows that variable structure control arithmetic realized roll stabilization control
the roll angle is less than 5.3 under powered flight
and that of unpowered flight is less than 0.5
respectively. The command fin angle is less than 1.5. High frequency chattering of fin command nearby the minimum velocity was trailed off by chattering reduction arithmetic. The sliding mode control arithmetic show good performance when aerodynamic coefficients varies 20%. The control arithmetic is easy to be implemented for its simplicity. 2011 IEEE.
The effectiveness of real-time embedded software testing (EI CONFERENCE)
会议论文
2011 9th International Conference on Reliability, Maintainability and Safety: Safety First, Reliability Primary, ICRMS'2011, June 12, 2011 - June 15, 2011, Guiyang, China
Zhang B.
;
Shen X.
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浏览/下载:28/0
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提交时间:2013/03/25
Real-time embedded software is widely applied in the fields with high reliability and security like aviation and space flight etc. In those systems
software quality is of vital importance
and software testing
as a means of guaranteeing the quality of software
is gaining increasingly more attention. The effectiveness of software testing enables people to gain confidence in software correctness. The real-time and embedding features of embedded software lead to the particularity in real-time embedded software testing. On the basis of particularity analysis of embedded software testing
the author of this thesis further conducted research on the effective Software Testing
and proved that it is valid to adopt testing techniques and strategies through experiments. 2011 IEEE.
Application of master-slave multi-communication system in pilotless airborne mapping equipment (EI CONFERENCE)
会议论文
5th International Symposium on Instrumentation Science and Technology, September 15, 2009 - September 18, 2009, Shenyang, China
Zhang Y.
;
Chen J.
;
Wang W.
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浏览/下载:22/0
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提交时间:2013/03/25
This paper presents a master-slave multi-communication system designed with several micro-controllers used as master and slave controllers to set signal the lamp to realize point-to-point communication through the RS422 interface. By describing a typical example of this system and the blue print of hardware and the flowchart of software
the reliable work of the system has been proved. The circuits of system are very simple and practical
and they can be used to realize all the functions of a pilotless airborne mapping equipment. It also has a strong anti-jamming capability due to its balanced transfer scheme with single transmitter and multiple receivers. It is very efficient in protecting the integrity and correctness of transmitted and received signals
avoiding the collision of signals through the bus
satisfying the communication among several micro-controllers in a single system and forming a special communication network. 2009 SPIE.
The signal extraction of fetal heart rate based on wavelet transform and BP neural network (EI CONFERENCE)
会议论文
Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, November 29, 2004 - December 1, 2004, Singapore, Singapore
Hong Y. X.
;
Cheng Z. B.
;
Dai F. H.
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浏览/下载:15/0
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提交时间:2013/03/25
This paper briefly introduces the collection and recognition of bio-medical signals
the other threading is analyzing data. Using the method
designs the method to collect FM signals. A detailed discussion on the system hardware
it is broaden to analyze the signal in real-time. Wavelet transform to remove the main interference in the FM and by adding time-window to recognize with BP network
structure and functions is also given. Under LabWindows/CVI
Finally the results of collecting signals and BP networks are discussed.8 pregnant women's signals of FM were collected successfully by using the sensor. The correctness rate of BP network recognition is about 83.3% by using the above measure.
the hardware and the driver do compatible
the hardware equipment work properly actively. The paper adopts multi threading technology for real-time analysis and makes use of latency time of CPU effectively
expedites program reflect speed
improves the program to perform efficiency. One threading is collecting data
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