oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Experimental Study of the Response of Transonic Diffuser Flow to a Piezoceramic Actuator at Diffuser Throat  [PDF]
Minoru Yaga, Yusuke Uechi, Hiroaki Ozono, Masaaki Ishikawa, Isao Teruya
Open Journal of Fluid Dynamics (OJFD) , 2013, DOI: 10.4236/ojfd.2013.32A003
Abstract:

An experimental study of the response of a piezoceramic actuator set at the throat to a transonic diffuser is carried out by measuring wall static pressure fluctuations and by visualizing the flow field using schlieren technique. The visualized flow fields are captured with a digital still camera and a digital high speed video camera. The piezo ceramic actuator is attached at the throat of the diffuser and driven by sinusoidal amplified voltage signals. The diffuser used in this experiment is circular arc half nozzle with the height h* and width w of 3 mm and 25 mm, respectively. The blockage factor of the piezoceramic actuator to the diffuser throat is 9.2% assuring the effect of change in the throat area rather than the boundary layer disturbances. The piezoceramic actuator is driven at the frequency of 100 Hz, 200 Hz, and 300 Hz and its amplitude is about 1 mm. It is found that the wall static pressure fluctuations and the behavior of the shock wave clearly correspond to the vibration of the piezo ceramic actuator for all the frequency ranges whereas the averaged shock position remains almost unchanged. All the results mentioned above suggest that driving the piezo ceramic actuator at the diffuser throat can be one of the promising techniques to control unsteady transonic diffuser flow.

LOW COST INTELLIGENT ARM ACTUATOR USING PNEUMATIC ARTIFICIAL MUSCLE WITH BIOFEEDBACK CONTROL
Salman Afghani,Yasir Raza,Bilal Haider
International Journal of Advances in Engineering and Technology , 2012,
Abstract: Hard Exoskeletons and arm actuators have already been designed and available in industry but they are expensive, heavy and cumbersome so to reduce these drawbacks a low cost lightweight intelligent arm actuator has been designed, constructed and evaluated. It consists of a pneumatic artificial muscle, constructed using a football bladder and covered by parachute material to limit its expansion. Pneumatic artificial muscle is under the control of micro controller that keep monitoring and controlling the air pressure of artificial muscle using biofeedback amplifier provided to micro controller from cuff bladder - which detects the muscle tension.
Study on ECNLP Dynamics Model of Piezoceramic Actuator and Position Tracking Controller
压电陶瓷驱动器ECNLP动力学模型及其位移跟踪控制器的研究

BIN Yang,YANG Dong-Chao,JIA Zhen-Zhong,CHEN Ken,
宾洋
,杨东超,贾振中,陈恳

自动化学报 , 2008,
Abstract: On account of the complex nonlinear hysteresis behaviour of piezoceramic actuator,in this paper,a novel electromechanical coupling nonlinear lumped-parameter(ECNLP)model of piezoelectric dynamic system is proposed. In this model,not only the static and dynamic characteristics of piezoceramic stack's nonlinear hysperesis,but also the dynamics of elastic and motive components within actuator are considered simultaneously.Based on the proposed model, the input-output linearization theory is utilized to implement the exact linearization,and deduced a subsystem presented with a linear controllable normal form.Utilizing this subsystem,a nonlinear position tracking control system is developed for piezoceramic actuator by adopting LQ method,and the stability of remaining internal dynamics is validated similarly. At last,the control performance is confirmed through computer simulations.
Zigbee Based Wireless Sensor and Actuator Network for Service Robot Intelligent Space  [PDF]
Baoye Song, Xiao Lu, Xingzhen Bai
Wireless Sensor Network (WSN) , 2012, DOI: 10.4236/wsn.2012.410034
Abstract: Wireless sensor and actuator network is the key technology of service robot intelligent space. This paper is concerned with design and implementation of a ZigBee based wireless sensor and actuator network (hereinafter referred to as ZWSAN), which has been applied in our service robot intelligent space successfully. Firstly, a simplified ZigBee stack applied to ZWSAN is proposed and the primitives of the stack are illustrated after a short overview of ZigBee protocols. Then the implementation of hardware module and software stack is introduced in detail as well as several representative devices integrated into ZWSAN, including environmental sensors for environmental perception, home devices controllers for device control, embedded speech recognition module for speech control, IMU module for abnormal behaviors detection and laser robot control for service robot navigation. An application example is described to demonstrate how the devices in ZWSAN to provide service cooperatively. Finally, we conclude this paper and discuss the future directions.
Intelligent emergency service systembased on wireless sensor and actuator networks  [PDF]
Zhang Ying, Zhang Jun, Song Guangming, Qiao Guifang, Song Aiguo
- , 2016, DOI: 10.3969/j.issn.1003-7985.2016.01.008
Abstract: An intelligent emergency service(IES)system is designed for indoor environments based on a wireless sensor and actuator network(WSAN)composed of a gateway, sensor nodes, and a multi-robot system(MRS). If the MRS receives accident alarm information, the group of robots will navigate to the accident sites and provide corresponding emergency services. According to the characteristics of the MRS, a distributed consensus formation protocol is designed, which can assure that the multiple robots arrive at the accident site in a specified formation. The prototype emergency service system was designed and implemented, and some relevant simulations and experiments were carried out. The results show that the MRS can successfully provide emergency lighting and failure node replacement services when accidents happen. The effectiveness of the algorithm and the feasibility of the system are verified.
Fabrication of Flexible Piezoelectric Fiber Composite Actuator by Arrangement-casting Method
LI Shi-Cheng, ZHU Kong-Jun, QIU Jin-Hao, PANG Xu-Ming
无机材料学报 , 2013, DOI: 10.3724/sp.j.1077.2013.12205
Abstract: The structure of piezoceramic fiber composite actuator was designed, consisting of interdigitated electrode plates, binder and piezoceramic fiber composite layer. The flexible, planar piezoceramic fiber composite actuators were prepared by arrangement-casting method. The electrical and mechanical properties of the PZN-PZT ceramics were tested. Piezoelectric properties of piezoceramic fiber composite were estimated by iso-strain mixing formulas. The strain properties of the actuator were tested using dynamic response system based on LabVIEW. The piezoelectric constant d33, Curie temperature Tc and elastic compliance coefficient s33 of the PZN-PZT ceramics are found to be 520 pC/N, 320 nd 20.5×10–12 m2/N, respectively. Theory of piezoelectric constants and of piezoceramic fiber composite are 509 and –156 pC/N, respectively. Test results show that the actuator is capable of producing large, directional in-plane strains. 100 parts-per-million longitudinal strain and 58 parts-per-million transverse strain were generated under a 300 V peak-to-peak applied voltage cycle. The stretching of the longitudinal and transverse directions are 3.6 μm and 1.7 μm, respectively, indicating the actuator has a high electromechanical property.
Square Wave Driver for Piezoceramic Actuators  [PDF]
Slawomir Jakiela,Jan Zaslona,Jacek A. Michalski
Actuators , 2012, DOI: 10.3390/act1010012
Abstract: We present the circuit and performance of a square wave driver and power supply for piezoceramic actuators characterized by large capacitance, up to 3 μF. Capacitance of piezoceramic element is the key factor that limits the use of powerful actuators operating at high frequencies (kHz). It is thus important to build a driver that allows use of a possible wide set of actuators in the widest range of frequencies appropriate for the piezoelement. The driver that we report uses the properties of non-inductive resistors that allow for operation at high frequencies. Our report details the design, construction, tests and limitations of the device and its application to the control of a microfluidic valve.
A Multi-Agent-Based Intelligent Sensor and Actuator Network Design for Smart House and Home Automation  [PDF]
Qingquan Sun,Weihong Yu,Nikolai Kochurov,Qi Hao,Fei Hu
Journal of Sensor and Actuator Networks , 2013, DOI: 10.3390/jsan2030557
Abstract: The smart-house technology aims to increase home automation and security with reduced energy consumption. A smart house consists of various intelligent sensors and actuators operating on different platforms with conflicting objectives. This paper proposes a multi-agent system (MAS) design framework to achieve smart house automation. The novelties of this work include the developments of (1) belief, desire and intention (BDI) agent behavior models; (2) a regulation policy-based multi-agent collaboration mechanism; and (3) a set of metrics for MAS performance evaluation. Simulations of case studies are performed using the Java Agent Development Environment (JADE) to demonstrate the advantages of the proposed method.
Process Chain Modelling and Analysis for the High-Volume Production of Thermoplastic Composites with Embedded Piezoceramic Modules  [PDF]
W. Hufenbach,M. Gude,N. Modler,Th. Heber,A. Winkler,T. Weber
Smart Materials Research , 2013, DOI: 10.1155/2013/201631
Abstract: Active composite structures based on thermoplastic matrix systems are highly suited to applications in lightweight structures ready for series production. The integration of additional functional components such as material-embedded piezoceramic actuators and sensors and an electronic network facilitates the targeted control and manipulation of structural behaviour. The current delay in the widespread application of such adaptive structures is primarily attributable to a lack of appropriate manufacturing technologies. It is against this backdrop that this paper contributes to the development of a novel manufacturing process chain characterized by robustness and efficiency and based on hot-pressing techniques tailored to specific materials and actuators. Special consideration is given to detailed process chain modelling and analysis focusing on interactions between technical and technological aspects. The development of a continuous process chain by means of the analysis of parameter influences is described. In conclusion, the use of parameter manipulation to successfully realize a unique manufacturing line designed for the high-volume production of adaptive thermoplastic composite structures is demonstrated. 1. Introduction The increasing scarcity or resources around the world necessitates the development of high-tech products with a high level of sustainability. Function-integrative lightweight engineering in multimaterial design is a vital source of key technologies for various applications in this field. In recent years comfort and environmental criteria have become an increasingly important element of automotive, medical, and civil engineering applications. The superior specific mechanical properties, excellent design flexibility, and cost-efficient, reproducible manufacturing processes which characterize fibre-reinforced composites based on thermoplastic matrix systems enable them to fulfil these criteria. In particular, those characteristics make them highly suited to applications in lightweight structures ready for high-volume production. Moreover, the integration of additional functional components such as piezoceramic actuators or sensors into thermoplastic lightweight structures facilitates the manipulation of the dynamic and vibroacoustic behaviour of those structures [1–3]. In addition to quality monitoring, energy harvesting, and active vibration or noise control [4–8], a number of structural applications (e.g., in morphing structures and compliant mechanisms) are also possible [9–13]. State-of-the-art production of adaptive lightweight
An Intelligent Sensor Array Distributed System for Vibration Analysis and Acoustic Noise Characterization of a Linear Switched Reluctance Actuator  [PDF]
José Salvado,António Espírito-Santo,Maria Calado
Sensors , 2012, DOI: 10.3390/s120607614
Abstract: This paper proposes a distributed system for analysis and monitoring (DSAM) of vibrations and acoustic noise, which consists of an array of intelligent modules, sensor modules, communication bus and a host PC acting as data center. The main advantages of the DSAM are its modularity, scalability, and flexibility for use of different type of sensors/transducers, with analog or digital outputs, and for signals of different nature. Its final cost is also significantly lower than other available commercial solutions. The system is reconfigurable, can operate either with synchronous or asynchronous modes, with programmable sampling frequencies, 8-bit or 12-bit resolution and a memory buffer of 15 kbyte. It allows real-time data-acquisition for signals of different nature, in applications that require a large number of sensors, thus it is suited for monitoring of vibrations in Linear Switched Reluctance Actuators (LSRAs). The acquired data allows the full characterization of the LSRA in terms of its response to vibrations of structural origins, and the vibrations and acoustic noise emitted under normal operation. The DSAM can also be used for electrical machine condition monitoring, machine fault diagnosis, structural characterization and monitoring, among other applications.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.