检索结果-内蒙古大学图书馆

A novel technique for optimal placement of piezoelectric actuators on smart structures

JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED mathematics 2011年第1期348卷 12-23页

作者： Mehrabian, Ali Reza Yousefi-Koma, Aghil Concordia Univ Dept Elect & Comp Engn Fac Engn & Comp Sci Montreal PQ H3G 1M8 Canada Univ Tehran Adv Dynam & Control Syst Lab Sch Mech Engn Tehran Iran

The problem of positioning of actuators and sensors on smart materials has been a point of interest in recent years. This is due to the fact that in many practical applications there are limitations in space, weight, etc. of the smart structures, which make the problem of positioning more complex. In addition, it is required that the actuators/sensors have the best possible performance. The development of smart structures technology in recent years has provided numerous opportunities for vibration control applications. The use of piezoelectric ceramics or polymers has shown great promise in the development of this technology. The employment of piezoelectric material as actuators in vibration control is beneficial because these actuators only excite the elastic modes of the structures without exciting the rigid-body modes. This is important since very often only elastic motions of the structures are needed to be controlled. The purpose of this paper is to introduce a novel approach developed for optimizing the location of piezoelectric actuators for vibration suppression of flexible structures. A flexible fin with bonded piezoelectric actuators is considered in this study. The frequency response function (FRF) of the system is then recorded and maximization of the FRF peaks is considered as the objective function of the optimization algorithm to find the optimal placement of the piezoelectric actuators on the smart fin. Three multi-layer perceptron neural networks are employed to perform surface fitting to the discrete data generated by the finite element method (FEM). Invasive weed optimization (IWO), a novel numerical stochastic optimization algorithm, is then employed to maximize the weighted summation of FRF peaks. Results indicate an accurate surface fitting for the FRF peak data and an optimal placement of the piezoelectric actuators for vibration suppression is achieved. (C) 2009 The Franklin Institute. Published by Elsevier Ltd. All rights reserved.

关键词： smart structures Vibration control Neural networks Optimization Invasive weed optimization

来源：评论

学校读者我要写书评

暂无评论

Current Research Activities in Mechatronic Applications at AM-TUM - Case Studies

Current Research Activities in Mechatronic Applications at A...

引用

3rd International Conference on smart materials, structures and Systems

作者： Ulbrich, Heinz Tech Univ Munich Fac Mech Engn Chair Appl Mech Inst Mechatron D-85748 Garching Germany

ISBN: (纸本)9783908158226

The research field Mechatronics combines the various engineering and science topics of mechanics, electronics, physics, mathematics and computer science into an integrated approach. This interdisciplinary view on technical issues enables the improved design of sophisticated systems meeting the increasing demands on performance, size and weight. Almost any research topic in this exciting field comprises new developments or optimisation in general using state-of-the-art techniques. In this paper case studies of the current research in various applications in the field of mechatronic are presented in progress at AM-TUM.

关键词： Actuators active auxiliary bearing non-smooth multibody dynamics unilateral contacts contact model nonlinear control 2D-Platform motion platform user interface humanoid robot hardware design

来源：评论

学校读者我要写书评

暂无评论

Deflection control of smart functionally graded beams

Deflection control of smart functionally graded beams

引用

8th International Conference on Computational structures Technology, CST 2006

作者： Eslami, M.R. Bidokhti, A.A. Sadighi, M. Gharib, A. Tehran Iran

ISBN: (纸本)9781905088089

In this paper, a smart functionally graded beam is investigated. The smart beam consists of three layers: one layer of functionally graded material (FGM) and two layers of piezoelectric material used as sensor and actuator. The properties of FGM layer are functionally graded in the thickness direction according to the volume fraction power law distribution. An analytical solution of the governing equations, which is based on the first-order shear deformation theory (Timoshenko theory), is presented. To achieve a mechanism of active control of the structure dynamic response, a constant velocity control algorithm is used. The effects of FGM constituent volume fraction and feedback control gain are investigated. © 2006 Civil-Comp Press.

关键词： Functionally graded materials

来源：评论

学校读者我要写书评

暂无评论

CAE approach to the design of smart structures applications

CAE approach to the design of smart structures applications

引用

6th European Conference on Noise control: Advanced Solutions for Noise control, EURONOISE 2006

作者： Van Der Auweraer, Herman Herold, Sven Mohring, Jan De Oliveira, Leopoldo Dailva, Maira Deraemaeker, Arnaud LMS International Interleuvenlaan 68 B - 3001 Leuven Belgium LBF Fraunhofer Institute for Structural Durability Darmstadt Germany ITWM Fraunhofer Institute for Technical Mathematics Kaiserslautern Germany K.U. Leuven PMA Division Leuven Belgium ULB Active Structures Laboratory Brussels Belgium

During last years, smart materials and control concepts developments have led to exploring practical applications. To make the step to industrial use, related design processes however must become part of the industrial product creation process. This requires the product functional performance simulation models to support the specific aspects related to advanced materials, active systems, actuators, sensors and control and integrate these into system level virtual prototype models. An industrial constraint is that these simulations make maximal use of standard simulation tools such as major FE/BE and MBS codes, 1-D simulation tools as Matlab-Simulink (MSL) etc. This involves developing modelling capabilities for the intelligent material systems and sensor/actuator components inside FE or as 1-D models in MSL. For the control system models, the key element is to link the worlds of 1-D control simulation and geometry-based structural simulation. To design the actual system-level application, a two-step approach is followed. The most promising macro configurations (control on panels, beams, mounts) are selected based on 3-D FE/MBS models using simplified controller models. In the second step, the selected configurations are optimised in terms of actuator and controller strategies/parameters using the 1-D Simulink environment. The research is executed as part of the EC-IP InMAR.

关键词： Simulink

来源：评论

学校读者我要写书评

暂无评论

Applications of neuro PID adaptive controller based on RBF neural networks identifier for structural control

Applications of neuro PID adaptive controller based on RBF n...

引用

smart structures and materials 2005 Conference

作者： Gu, ZQ Oyadiji, SO Univ Manchester Sch Mech Aerosp & Civil Engn Manchester M13 9PL Lancs England

ISBN: (纸本)0819457388

Because the disturbances which govern the dynamical response of a structure cannot be precisely measured, and the system itself has many uncertainties, the development of control strategies that are implementable and that can accommodate uncertainties and imprecision are becoming a critical and challenging work. PID adaptive controller based on RBF Neural Networks Identifier is developed for structural control in this paper. The combined controller includes PID neural network controller and an identifier based on RBF neural networks. It was implemented on linear single degree of freedom system representation of structures subjected to external disturbances based on the El Centro (1940), Hachinohe (1988), Kobe (1995) and Northridge (1994) earthquake loadings. It is demonstrated that the neuro PID adaptive control method can effectively suppress the vibration of structures.

关键词： structural control neuro PID adaptive controller PID control adaptive control RBF neural networks active control hybrid control earthquake loading

来源：评论

学校读者我要写书评

暂无评论

smart material systems : model development /

引用

2005年

作者： Smith Ralph C.

来源：内蒙古大学图书馆图书评论

学校读者我要写书评

暂无评论

Adaptive aerostructures: the first decade of flight on uninhabited aerial vehicles

Adaptive aerostructures: the first decade of flight on uninh...

引用

smart structures and materials 2004 Conference

作者： Barrett, R Delft Univ Technol Fac Aerosp Engn NL-2629 HS Delft Netherlands

ISBN: (纸本)0819453056

Although many subscale aircraft regularly fly with adaptive materials in sensors and small components in secondary subsystems, only a handful have flown with. adaptive aerostructures as flight critical, enabling components. This paper reviews several families of adaptive aerostructures which have enabled or significantly enhanced flightworthy uninhabited aerial vehicles (UAVs), including rotary and fixed wing aircraft, missiles and munitions. More than 40 adaptive aerostructures programs which have had a direct connection to flight test and/or production UAVs, ranging from hover through hypersonic, sea-level to exo-stratospheric are examined. Adaptive material type, design Mach range, test methods, aircraft configuration and performance of each of the designs are presented. An historical analysis shows the evolution of flightworthy adaptive aerostructures from the earliest staggering flights in 1994 to modem adaptive UAVs supporting live-fire exercises in harsh military environments. Because there are profound differences between bench test, wind tunnel test, flight test and military grade flightworthy adaptive aerostructures, some of the most mature industrial design and fabrication techniques in use today will be outlined. The paper concludes with an example of the useful load and performance expansions which are seen on an industrial, military-grade UAV through the use of properly designed, flight-hardened adaptive aerostructures.

关键词： piezoelectric shape memory alloy adaptive flight control uninhabited aerial vehicle

来源：评论

学校读者我要写书评

暂无评论

Energy optimization of driving amplifiers for smart actuators

Energy optimization of driving amplifiers for smart actuator...

引用

smart structures and materials 2003 Conference

作者： Zhu, H Song, C Lindner, DK Abdalla, MM Gürdal, Z Virginia Polytech Inst & State Univ CPES Bradley Dept Elect & Comp Engn Blacksburg VA 24061 USA

ISBN: (纸本)0819448540

A high-efficiency driving amplifier with small profile for smart actuators is essential for portable actuator devices. In this paper, a detailed optimized design of half-bridge switching circuit to drive smart actuators is described. The mathematical optimization procedure is applied to the traditional circuit design to make the circuit smaller and more efficient. The objective function presented in this paper is to minimize the total weight of the circuit, including heat sink, inductor and bus capacitor. The calculation of the power dissipation of MOSFET is adopted as a critical step to get the suitable heat sink. The optimization results are presented to demonstrate the effectiveness of this method.

关键词： Field effect transistors Switching Amplifiers Actuators Resistance Optimization (mathematics) Capacitors Electronics smart materials Capacitance

来源：评论

学校读者我要写书评

暂无评论

Optimization of control laws for damage detection in smart structures

引用

Proceedings of SPIE - The International Society for Optical Engineering 2000年 3984卷 395-402页

作者： Ray, Laura R. Marini, Solomon Dartmouth Coll Hanover United States

A prevalent method of damage detection is based on identifying changes in modal characteristics due to damage induced variations in stiffness or mass along a structure. It is known that modal frequencies can be insensitive to damage, and the open-loop sensitivity itself depends on modal properties and damage location. Here, we develop methods of designing control laws that enhance the sensitivity of modal characteristics to damage. Sensitivity enhancing control exploits the relationship between control gains and closed-loop dynamics in order to increase the observability of damage. The design methods are based on optimization of cost functions that involve the dependence of classic measures of sensitivity on design variables, which include placement of sensors and actuators and state feedback control gains. Due to the size of the design space and the unknown nature of the cost surface, genetic algorithms are used to find control laws that maximize sensitivity to specific damage types subject to control effort and stability constraints. Optimized control laws designed for sensitivity enhancement of stiffness damage in a cantilevered beam are demonstrated by numerical simulation.

关键词： Intelligent structures

来源：评论

学校读者我要写书评

暂无评论

Optimization of control laws for damage detection in smart structures

Optimization of control laws for damage detection in smart s...

引用

smart structures and materials 2000 - mathematics and control in smart structures

作者： Ray, Laura R. Marini, Solomon Dartmouth Coll Hanover NH United States

关键词： Intelligent structures

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：