We present a sensor model comprised of a Timoshenko beam coupled with a linear viscoelastic substrate via a distributedsystem of compliant elements. The system of governing equations includes the evolution of the kin...
详细信息
Consider a network with linear dynamics on the edges, and observation and control in the nodes. Assume that on the edges there is no damping, and so the dynamics Can he described by an infinite-dimensional, port-Hamil...
详细信息
Consider a network with linear dynamics on the edges, and observation and control in the nodes. Assume that on the edges there is no damping, and so the dynamics Can he described by an infinite-dimensional, port-Hamiltonian system. For general infinite-dimensional systems, the zero dynamics can be difficult to characterize and are sometimes ill posed. However, for this class of systems the zero dynamics are shown to be well-defined. Using the underlying structure, simple characterizations and a constructive procedure can be obtained. (C) 2015, ILAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.
Many rods exhibit a coupling effect between axial and transversal displacements. Additional forces may be caused by a superimposed axial motion of the rod. We explore how these effects can be mathematically modeled us...
详细信息
Many rods exhibit a coupling effect between axial and transversal displacements. Additional forces may be caused by a superimposed axial motion of the rod. We explore how these effects can be mathematically modeled using a rod with two local degrees of freedom. The resulting geometrically nonlinear model can be reduced to a system with just one local degree of freedom, i.e., the transverse displacement. These models are compared to commonly used modeling strategies where the rod is given just one local degree of freedom right at the beginning. Results from a numerical example complement the theoretical findings. (C) 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.
The Zakai filtering is applied for tracking of nonlinear time-varying parameters on a physical model describing typical electrodeposition process that is fixed on the bulk solution boundary of diffusion layer and is o...
详细信息
The Zakai filtering is applied for tracking of nonlinear time-varying parameters on a physical model describing typical electrodeposition process that is fixed on the bulk solution boundary of diffusion layer and is observed-controlled on the electrode surface. The applied boundary control depends on the unknown drifting parameters in a severely nonlinear relationship. A computational algorithm is proposed for drifting parameters estimation based on the factorized Zakai filter. The consistency of estimates is analyzed in simulation on the diffusion type model developed for the copper electrodeposition process. (C) 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.
Solid-state fermentation is gaining increasing importance for the production of high-added value products, for instance enzymes, from agro-industrial by-products. The main difficulty in operating this process in packe...
详细信息
Solid-state fermentation is gaining increasing importance for the production of high-added value products, for instance enzymes, from agro-industrial by-products. The main difficulty in operating this process in packed-bed bioreactors is the development of temperature and moisture gradients along the reactor length which decrease the overall productivity. In this work a practically relevant feedback control scheme is developed that allows influencing and equalizing the moisture and temperature distributions along the packed-bed bioreactor during solid-state fermentation. This prevents locally critical process conditions which may necessitate the shutdown of the operation of the bioreactor. (C) 2015 The Authors. Published by Elsevier Ltd.
This paper study the sampled-data control problem of a class of distributed parameter systems. A novel sampled-data control scheme is presented using mobile actuator-sensor networks. By utilizing a Lyapunov functional...
详细信息
ISBN:
(纸本)9781479958252
This paper study the sampled-data control problem of a class of distributed parameter systems. A novel sampled-data control scheme is presented using mobile actuator-sensor networks. By utilizing a Lyapunov functional which depend on spatial parameter, a controller combine to decentralized static output feedback control scheme and the point measurement of the mobile sensor is designed to derive several sufficient criteria ensuring the distributed parameter systems to be globally asymptotically stable. The criteria are given in the form of linear operator inequalities and the velocity law of each mobile actuator/sensor. It is also shown that static sampled-data control of distributed parameter systems is just a special case of our main results. A numerical simulations illustrate the effectiveness of the proposed control scheme in enhancing system performance.
This paper studies the application of reduced models of a distributed parameter system for robust process control and state estimation. We take the approach of integrating model reduction, parameter identification, an...
详细信息
This paper studies the application of reduced models of a distributed parameter system for robust process control and state estimation. We take the approach of integrating model reduction, parameter identification, and model uncertainty analysis, in purpose to find an appropriate trade-off between complexity and robust performance. The application example is the temperature system in a continuous paper pulp digester. Physical modeling of this process results in coupled linearized partial differential equations which are then reduced into low-order nominal process models using an orthogonal collocation approximation method. Two different approaches to obtaining it model uncertainty description are adapted for use on a distributed parameter system with low-order nominal model and shown to produce similar results when tested with measurement data. It is also demonstrated how this uncertainty description, in combination with the reduced model, may be used for robust control design and verification of the control performance on the distributed parameter system. Finally, the possibility of estimating the distributed process state using a state observer for the reduced process is demonstrated. Measurements of the process state in a certain position is available and is shown to agree with the estimated state at the same position. (C) 2008 Elsevier Ltd. All rights reserved.
Solid-state fermentation is gaining increasing importance for the production of high-added value products, for instance enzymes, from agro-industrial by-products. The main difficulty in operating this process in packe...
详细信息
Solid-state fermentation is gaining increasing importance for the production of high-added value products, for instance enzymes, from agro-industrial by-products. The main difficulty in operating this process in packed-bed bioreactors is the development of temperature and moisture gradients along the reactor length which decrease the overall productivity. In this work a practically relevant feedback control scheme is developed that allows influencing and equalizing the moisture and temperature distributions along the packed-bed bioreactor during solid-state fermentation. This prevents locally critical process conditions which may necessitate the shutdown of the operation of the bioreactor.
In this paper, we consider the H ∞ control problem of a coupled transport-diffusion system related to parallel-flow heat exchange process. It is shown that, by using our previous result for a single diffusion system,...
详细信息
In this paper, we consider the H ∞ control problem of a coupled transport-diffusion system related to parallel-flow heat exchange process. It is shown that, by using our previous result for a single diffusion system, the H ∞ control problem can be solved by constructing a residual mode filter (RMF)-based controller which is of finite-dimension.
An iterative algorithm based on orthogonal function of parameter identification for distributed parameter system is proposed in this paper, which includes the initial condition and boundary condition to improve identi...
详细信息
ISBN:
(纸本)9780769535838
An iterative algorithm based on orthogonal function of parameter identification for distributed parameter system is proposed in this paper, which includes the initial condition and boundary condition to improve identification precision and keep the spatial distributed characteristic. During iterative process, a new uniform method based on block pulse function (BPF) is used to deriving the integral operational matrix, which is a kind of orthogonal function transfer used to transfer the two order partial differential equation to algebra equation. The parameter identification method is simple and easy to compute. The simulation result indicates that this method can meet the demand on real-time and precision of control system.
暂无评论