An efficient C-0 continuous two-dimensional finite-element model has been presented in this paper for the control of laminated composite and sandwich plates embedded/surface-bonded with piezoelectric layers and subjec...
详细信息
An efficient C-0 continuous two-dimensional finite-element model has been presented in this paper for the control of laminated composite and sandwich plates embedded/surface-bonded with piezoelectric layers and subjected to mechanical loading as well as electric potential. The problem of modeling of smart laminates involves the coupling between mechanical and electrical fields. The structural component is modeled by an efficient equivalent single-layer plate theory, which ensures interlaminar shear-stress continuity and zero transverse shear-stress conditions at the top and bottom of the plate surfaces. Moreover, this theory contains unknowns defined at the reference plane (i.e., midplane) only. The electric field is modeled using layerwise theory, which contains the unknowns at each layer interfaces. The proposed combine model, which may be called a refined hybrid plate model, is implemented to analyze the coupled problem of piezoelectricity in laminated composites and sandwich plates.
A novel synchronization motion control method is proposed in this paper for the system in which two manipulators are constrained by a flexible beam. Different from the general synchronization control method, the coupl...
详细信息
A novel synchronization motion control method is proposed in this paper for the system in which two manipulators are constrained by a flexible beam. Different from the general synchronization control method, the coupling dynamics among various actuators is considered as the shear force, which results from the synchronization errors. Then a simple boundary control is introduced to realize the synchronization motion of actuators by suppressing the shear force. In order to avoid the drawbacks of assumed modes model, the dynamic model of flexible beam is described by a distributedparameter model in this paper. A Riesz basis method is used to prove that the proposed control law can guarantee the synchronization system to be exponential stability. Simulation results demonstrate that the proposed method can effectively improve the performance of synchronization motion compared with other methods. (C) 2014 Elsevier Ltd. All rights reserved.
In this paper, robust adaptive control is developed for a thruster assisted position mooring system in the transverse direction. To provide an accurate and concise representation for the dynamic behavior of the moorin...
详细信息
In this paper, robust adaptive control is developed for a thruster assisted position mooring system in the transverse direction. To provide an accurate and concise representation for the dynamic behavior of the mooring system, the flexible mooring lines are modeled as a distributed parameter system of partial differential equations (PDEs). The proposed control is applied at the top boundary of the mooring lines for station keeping via Lyapunov's direct method. Adaptive control is designed to handle the system parametric uncertainties. With the proposed robust adaptive control, uniform boundedness of the system under the ocean current disturbance is achieved. The proposed control is implementable with actual instrumentations since all the signals in the control can be measured by sensors or calculated by using a backward difference algorithm. The effectiveness of the proposed control is verified by numerical simulations. (C) 2014 Elsevier Ltd. All rights reserved.
In this paper the theory of robust output regulation of distributed parameter systems with infinite-dimensional exosystems is extended for plants with unbounded control and observation. As the main result, we present ...
详细信息
In this paper the theory of robust output regulation of distributed parameter systems with infinite-dimensional exosystems is extended for plants with unbounded control and observation. As the main result, we present the internal model principle for linear infinite-dimensional systems with unbounded input and output operators. We do this for two different definitions of an internal model found in the literature, namely, the p-copy internal model and the G-conditions. We also introduce a new way of defining an internal model for infinite-dimensional systems. The theoretic results are illustrated with an example where we consider robust output tracking for a one-dimensional heat equation with boundary control and pointwise measurements.
In this technical note we study the role of the exosystem in the theory of output regulation for linear infinite-dimensional systems. The main result of this technical note shows that a stabilizing autonomous controll...
详细信息
In this technical note we study the role of the exosystem in the theory of output regulation for linear infinite-dimensional systems. The main result of this technical note shows that a stabilizing autonomous controller that achieves output tracking of an almost periodic reference signal is also capable of tracking any signal generated by a full exosystem. Moreover, given an almost periodic reference signal, we present a method for constructing a minimal exosystem generating this signal.
In the study a linear dynamical model suitable for metro-applications is constructed and analysed in the framework of the Winkler-foundation theory. The metro track is allocated within the inner space of the tube of b...
详细信息
In the study a linear dynamical model suitable for metro-applications is constructed and analysed in the framework of the Winkler-foundation theory. The metro track is allocated within the inner space of the tube of big diameter The tube is considered as a beam on elastic and damped foundation. The track itself consists also of two elastically supported beams, namely the basement beam made of steel-reinforced concrete is situated at the bottom of the tube and connected to the lower-inner surface of the tube by an elastic and dissipative "carpet-pad". The concrete beam supports the rails through an elastic and dissipative layer The wheel loads acting on the rails are moving horizontally along the track. The set of partial differential equations describing the vertical motion of the three-layer dynamical system is composed and the method of solution in the case of travelling wheel loads is elaborated.
This paper is focused on adaptively controlling a linear infinite-dimensional system to track a finite-dimensional reference *** a linear continuous-time infinite-dimensional plant on a Hilbert space with disturbances...
详细信息
This paper is focused on adaptively controlling a linear infinite-dimensional system to track a finite-dimensional reference *** a linear continuous-time infinite-dimensional plant on a Hilbert space with disturbances of known waveform but unknown amplitude and phase,we show that there exists a stabilizing direct model reference adaptive control law with the properties of certain disturbance rejection and *** plant is described by a closed,densely defined linear operator that generates a continuous semigroup of bounded operators on the Hilbert space of *** central result will show that all errors will converge to a prescribed neighborhood of zero in an infinitedimensional Hilbert *** result will not require the use of the standard Barbalat’s lemma which requires certain signals to be uniformly *** result is used to determine conditions under which a linear infinite-dimensional system can be directly adaptively controlled to follow a reference *** particular,we examine conditions for a set of ideal trajectories to exist for the tracking *** results are applied to adaptive control of general linear diffusion systems described by self-adjoint operators with compact resolvent.
This paper presents a novel model predictive control configuration for nonlinear distributed parameter systems based on least squares support vector machine. First, a data-based modeling methodology for an unknown non...
详细信息
This paper presents a novel model predictive control configuration for nonlinear distributed parameter systems based on least squares support vector machine. First, a data-based modeling methodology for an unknown nonlinear distributed parameter system is introduced. Subsequently, the model predictive control framework based on the aforementioned model is presented at the measured point. To verify the effectiveness and feasibility of the control arithmetic, simulation results from a tubular reactor with the controller designed by the presented procedure are given.
A multi-variable fuzzy logic controller (FLC) is proposed to control a class of distributed parameter systems (DPSs). When a DPS is transformed into finite-dimensional ordinary differential equations (ODES) by using t...
详细信息
A multi-variable fuzzy logic controller (FLC) is proposed to control a class of distributed parameter systems (DPSs). When a DPS is transformed into finite-dimensional ordinary differential equations (ODES) by using time/space separation, each ODE can be considered as a subsystem. According to design strategy of conventional FLC, one FLC should be designed for one subsystem. It will be very complex because there are many subsystems. In order to reduce design complexity, only a MF and a rule base are designed in the controller. For other subsystems or ODEs, their MFs can be designed equivalently by introducing scaling factors. Then, the proposed FLC has ability to control multi-variable processes. At last, the proposed FLC is applied to control a rod catalytic reaction process. The simulation results demonstrate the effectiveness of the proposed fuzzy control strategy. (C) 2012 Elsevier Ltd. All rights reserved.
Multi-layer piezoelectric actuators (PEAs) are commonly to produce extremely small displacements. Dynamic modeling of PEAs, which can be used to analyze or predict their frequency/time-domain behaviors, plays importan...
详细信息
ISBN:
(纸本)9781479964871
Multi-layer piezoelectric actuators (PEAs) are commonly to produce extremely small displacements. Dynamic modeling of PEAs, which can be used to analyze or predict their frequency/time-domain behaviors, plays important roles in the design and control of PEA-based mechanisms. This paper provides a rationale that the complex electrical-mechanical coupled behaviors of PEA can be modelled as an equivalent simple solid with two equivalent excitation forces (proportional to the excitation voltage of PEA) that are equal and opposite, acting at two ends of PEA. Such a rationale is demonstrated through the mathematical derivation process, based on the IEEE standard constitutive relations of piezoelectricity. From the derivation process, the underlying assumptions for the equivalent model to be effective are revealed and the relevant constants in equivalent models are correlated to the standard IEEE piezoelectric material properties. The identified underlying assumptions can provide a guideline for designs to use this simple PEA model. The identified correlation between the constants in equivalent models and the standard IEEE piezoelectric materials allows an alternative way to obtain the equivalent constants, if it is not available for experiments to determine them.
暂无评论