this paper describes the investigation of linear and parametric iterative learning control (ILC) methods with an integrated computed torque control approach and the application in a mobile multi-body service robot. In...
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ISBN:
(纸本)9781479987016
this paper describes the investigation of linear and parametric iterative learning control (ILC) methods with an integrated computed torque control approach and the application in a mobile multi-body service robot. In addition to the controller structure, the development of the nonlinear dynamic model and the trajectory generation for the robot-configuration control are briefly explained.
the aim of this paper is to investigate a direct numerical method for solving a class of a fractional variational problem (FVP). the fractional derivative in the FVP is in the Caputo sense. the Rayleigh-Ritz method is...
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ISBN:
(纸本)9781479987016
the aim of this paper is to investigate a direct numerical method for solving a class of a fractional variational problem (FVP). the fractional derivative in the FVP is in the Caputo sense. the Rayleigh-Ritz method is introduced for the numerical solution of the FVP. the corresponding Euler-Lagrange equation contain the left and right Caputo fractional derivatives. We approximate the solution of the FVP by using the trigonometric function. Finally, the illustrative example is presented.
the paper describes a nonlinear controller design technique for a servo drive in the presence of: 1) nonlinear friction (or any other load torque), 2) a flexible shaft that connects the motor and the load. the shaft i...
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ISBN:
(纸本)9781479987016
the paper describes a nonlinear controller design technique for a servo drive in the presence of: 1) nonlinear friction (or any other load torque), 2) a flexible shaft that connects the motor and the load. the shaft is characterized by the stiffness and the damping coefficients. the proposed controller is based on adaptive backstepping, modified by the use of command filtering. Although in the presence of damping the model is not in a strict-feedback form, the proposed approach allows to accomplish the rigorous proof of the closed-loop system stability. Several experiments prove the control effectiveness and robustness against un-modelled dynamics.
In the paper, a novel practical analog modeling of multiple-switching fractional order systems based on recursive fractional variable order integrals, is introduced. Presented circuit, based on domino ladder approxima...
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ISBN:
(纸本)9781479987016
In the paper, a novel practical analog modeling of multiple-switching fractional order systems based on recursive fractional variable order integrals, is introduced. Presented circuit, based on domino ladder approximation of half order impedance, allows to multiple-switching between orders 0.5 and 1. Moreover, numerical scheme for solving variable order differential equations is introduced. Experimental results of modeling are also presented and compared with numerical simulations.
Technology improvement makes PKM faster and faster. From this speed it appears uncontrolled vibrations which disrupt PKM functioning. the urge to produce modelling enabling to predict dynamic perturbations is more and...
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ISBN:
(纸本)9781479987016
Technology improvement makes PKM faster and faster. From this speed it appears uncontrolled vibrations which disrupt PKM functioning. the urge to produce modelling enabling to predict dynamic perturbations is more and more important. To this day, linearized dynamic models are incomplete, ignoring account of speed and acceleration over trajectory. In this paper, a complete dynamic linearization will be presented, and will allow to reveal high speed influence among PKM eigenvalues.
A development of advanced control methods based on robustness, optimality and prediction is an important and challenging task. In recent years, a new control approaches have emerged to replace or augment conventional ...
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ISBN:
(纸本)9781479987016
A development of advanced control methods based on robustness, optimality and prediction is an important and challenging task. In recent years, a new control approaches have emerged to replace or augment conventional control engineering methods. the paper presents: design, verification and comparison of three advanced methods (IMC, MPC, PLM) applied in the control of dynamic processes with complex dynamics. In this paper three different methods were tested and applied to the position control of pneumatic servodrives. the presented and tested methods guarantee robust stability and high performance of the pneumatic servodrives control.
the impact of the usage another than the Gaussian probability density functions in transition and measurement models has been verified in the article. Cases, in which wrong models have been assumed, also have been tak...
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ISBN:
(纸本)9781479987016
the impact of the usage another than the Gaussian probability density functions in transition and measurement models has been verified in the article. Cases, in which wrong models have been assumed, also have been taken into account. Simulations have been performed for two different objects. Based on the obtained results, it can be said that in some cases incorrect modelling can allow the best estimation quality.
the effect of vignetting is undesirable in image processing and analysis. It cause fall-off of pixel intensity from centre towards edges of the image. In this paper, we propose a new procedure of fast vignetting reduc...
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ISBN:
(纸本)9781479987016
the effect of vignetting is undesirable in image processing and analysis. It cause fall-off of pixel intensity from centre towards edges of the image. In this paper, we propose a new procedure of fast vignetting reduction based on two images acquired with different camera/lens settings. the change of lens aperture or focal length will also change the effect of vignetting in images. these differences are used to estimate a vignetting function, which is used for vignetting reduction. the obtained image after vignetting reduction is not significantly different from the image without vignetting.
In the paper we consider a coupled problem of the linearly elastic body immersed in the flowing fluid which is modelled by means of incompressible Navier-Stokes equations. the approach is based on transforming the var...
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ISBN:
(纸本)9781479987016
In the paper we consider a coupled problem of the linearly elastic body immersed in the flowing fluid which is modelled by means of incompressible Navier-Stokes equations. the approach is based on transforming the variable domain occupied by the fluid to the fixed one corresponding to the un-deformed elastic inclusion. the main idea consists in performing the linearisation of this transformation, similarly as in linear elasticity one assumes the smallness of strains. We base our approach on the observation that the gradients of the suitably defined transformation are bounded by traces of strains on the surface of the elastic body.
In the paper a method of synthesis of a neural controller which goal is to reduce effects of coupling of the nonlinear multi-input multi-output (MIMO) plant inputs and outputs is presented. the designed neural control...
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ISBN:
(纸本)9781479987016
In the paper a method of synthesis of a neural controller which goal is to reduce effects of coupling of the nonlinear multi-input multi-output (MIMO) plant inputs and outputs is presented. the designed neural controller contains a set of neural nets that determine values of parameters of linear decoupling controllers calculated for the adopted nonlinear plant model at its operating points. A known dynamic decoupling technique is used to generate training and evaluation data for the synthetized neural nets. the resulting neural (gain-scheduling) controller varies its parameters depending on the current plant operating point.
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