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Decomposed Fliess Functional Expansion and Its Application to Attitude Control of Missiles
Daizhan Cheng,Yupeng Qiao,Yanyan Yuan 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper investigates the Fliess functional expansion of input-output decomposable systems. It is proved that under suitable state feedback the closed-loop system has a Fliess functional expansion of finite terms. This form has two advantages: (1) providing a precise input-output mapping; (2) tremendously reducing the complexity of computation and making the online control design available. It is proved that the model of attitude control of missiles satisfies this decomposable requirement. Hence, the finite Fliess functional expansion technique is applicable to it. Detailed algorithm is provided for the design of attitute control.
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The Design of a Guide Device with Multi-Function to Aid Travel for Blind Person
Jiayin Song,Wenlong Song,Yupeng Cheng,Xuefu Cao 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.4
A design method of a guide device with multi-function presented in this paper, the multi-function contents of obstacle avoidance, azimuth guidance, banknote recognition and time broadcast. The hardware system of the guide device based on single-chip system STC89C52 and peripheral added eight expansion units: power supply unit, key input unit, ultrasonic detection unit, azimuth guidance unit, banknote recognition unit, clock Unit, phonetic unit and display unit. The functions were tested and results show that the device is suitable for sunny conditions whose best setting distance range is between 700mm to 1600mm and direction function is good showing in open environment, while the function of currency recognition has some limitations because of color identification. Comprehensive consideration the device can meet the blind person’s basic travel demand and has the characteristics of low-cost and stable performance.
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Investigation of temperature sensitivity of actuation performance for piezoelectric fiber composites
Lin, Xiujuan,Chen, Haiyan,Ma, Yupeng,Fisher, John G.,Huang, Shifeng,Zhang, Dou,Cheng, Xin Elsevier 2017 CERAMICS INTERNATIONAL Vol.43 No.13
<P><B>Abstract</B></P> <P>Piezoelectric fiber composites (PFCs) suffer an extremely wide range of temperatures when used in various aerospace structures where temperature effects on the mechanical properties of PFCs are important. In this paper, the actuation performances of PFCs were studied when they were exposed to environmental temperatures from −15°C to 80°C. The results showed that the actuation performance of PFCs was greatly dependent on the environmental temperature. The free strain values and the calculated piezoelectric coefficients d<SUB>33</SUB> and d<SUB>31</SUB> were initially enhanced with the increase of temperature due to the restricted movement of epoxy molecule in the glassy state. The glass transition temperature range of the composite was broadened due to a large number of small pores on the surface of the Pb(Zr,Ti)O<SUB>3</SUB> (PZT) fibers, when the epoxy molecules inside the pores had different transition behaviors compared with those outside the pores. The actuation performance including free strain performance and actuation capability, as well as the piezoelectric coefficients d<SUB>33</SUB> and d<SUB>31</SUB> decreased as the temperature increased above room temperature, since the deformation of epoxy molecules in the viscoelastic state was irreversible.</P>
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