Designing simple cooperative sensor/actuator robots for liquid process environments

2002 ◽  
Author(s):  
P. Appelqvist ◽  
A. Halme ◽  
T. Schonberg ◽  
A. Vainio ◽  
Yan Wang
Keyword(s):  
Sensor Actuator ◽  
Liquid Process

scholarly journals State Estimation for a Class of Distributed Parameter Systems with Time-Varying Delay over Mobile Sensor–Actuator Networks with Missing Measurements

Mathematics ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 661
Author(s):  
Huansen Fu ◽  
Baotong Cui ◽  
Bo Zhuang ◽  
Jianzhong Zhang
Keyword(s):  
State Estimation ◽  
Distributed Parameter Systems ◽  
Operator Semigroup ◽  
Distributed Parameter ◽  
Time Varying ◽  
Mobile Sensor ◽  
Missing Measurements ◽  
Time Varying Delay ◽  
Sensor Actuator ◽  
Varying Delay

This work proposes a state estimation strategy over mobile sensor–actuator networks with missing measurements for a class of distributed parameter systems (DPSs) with time-varying delay. Initially, taking advantage of the abstract development equation theory and operator semigroup method, this kind of delayed DPSs described by partial differential equations (PDEs) is derived for evolution equations. Subsequently, the distributed state estimators including consistency component and gain component are designed; the purpose is to estimate the original state distribution of the delayed DPSs with missing measurements. Then, a delay-dependent guidance approach is presented in the form of mobile control forces by constructing an appropriate Lyapunov function candidate. Furthermore, by applying Lyapunov stability theorem, operator semigroup theory, and a stochastic analysis approach, the estimation error systems have been proved asymptotically stable in the mean square sense, which indicates the estimators can approximate the original system states effectively when this kind of DPS has time-delay and the mobile sensors occur missing measurements. Finally, the correctness of control strategy is illustrated by numerical simulation results.

scholarly journals Fabrication of Flexible Piezoelectric PZT/Fabric Composite

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
Caifeng Chen ◽  
Daiwei Hong ◽  
Andong Wang ◽  
Chaoying Ni
Keyword(s):  
Composite Material ◽  
Glass Fiber ◽  
Piezoelectric Materials ◽  
Hydrothermal Condition ◽  
Curved Surfaces ◽  
Piezoelectric Crystal ◽  
Optimum Conditions ◽  
Sensor Actuator ◽  
Fabric Composite ◽  
Complicated Conditions

Flexible piezoelectric PZT/fabric composite material is pliable and tough in nature which is in a lack of traditional PZT patches. It has great application prospect in improving the sensitivity of sensor/actuator made by piezoelectric materials especially when they are used for curved surfaces or complicated conditions. In this paper, glass fiber cloth was adopted as carrier to grow PZT piezoelectric crystal particles by hydrothermal method, and the optimum conditions were studied. The results showed that the soft glass fiber cloth was an ideal kind of carrier. A large number of cubic-shaped PZT nanocrystallines grew firmly in the carrier with a dense and uniform distribution. The best hydrothermal condition was found to be pH 13, reaction time 24 h, and reaction temperature 200°C.

Low Activity Mechanism for Mobile Sensor/Actuator Networks Based on IEEE 802.15.4

2017 ◽  
Vol 97 (1) ◽  
pp. 197-212 ◽  
Author(s):  
C. Rubia-Marcos ◽  
J. Medina-García ◽  
J. Galán ◽  
D. Daza ◽  
R. G. Carvajal
Keyword(s):  
Ieee 802.15.4 ◽  
Mobile Sensor ◽  
Sensor Actuator ◽  
Activity Mechanism ◽  
Low Activity
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