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2012 IEEE 8th International Colloquium on Signal Processing and Its Applications, CSPA 2012

作者： Jailani, R. Tokhi, M.O. Faculty of Electrical Engineering Universiti Teknologi MARA 40450 Shah Alam Selangor Malaysia Department of Automatic Control and System Engineering University of Sheffield United Kingdom

ISBN: (纸本)9781467309615

Stimulation trains of different combination of frequency and pulse-width can be used to generate the muscle force required to perform a functional task during functional electrical stimulation (FES). However, with repetitive activation, the muscle will fatigue and an increase in either the frequency or the pulse-width of stimulation will be required to enable the targeted muscle force to be maintained. This study compares isometric performance and paraplegic muscle fatigue using two different protocols: protocol 1 uses 5 different stimulation frequencies varying from 10Hz to 50Hz with other parameters fixed;and protocol 2 uses 5 different stimulation pulse-widths varying from 200s to 400s with other parameters fixed. This range is selected based on a suitable frequency and a pulse width for paraplegic. Muscle performance is assessed by measuring percent decline in peak force and maximum muscle force for different stimulation frequencies and pulse-widths. A simple rule is introduced to avoid spasm or injury to the leg during FES application. The results from this study show that higher frequency gives faster muscle fatigue and the selection of force required to perform a functional task is important for obtaining the optimum stimulation parameters. Stimulation pulse-width has no significant effect on the muscle fatigue but highly affects the maximum muscle force. The rule proposed is important and is found to be useful to avoid leg injury, spasm or uncomfortable feeling during FES application. This rule also can be used to choose optimum stimulation parameters. © 2012 IEEE.

关键词： Muscle

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Second order sliding mode controller for longitudinal wheel slip control

Second order sliding mode controller for longitudinal wheel ...

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2012 IEEE 8th International Colloquium on Signal Processing and Its Applications, CSPA 2012

作者： Hamzah, Norhazimi Md Sam, Yahaya Selamat, Hazlina Aripin, M. Khairi Ghazali, Rozaimi Faculty of Electrical Engineering Universiti Teknologi MARA Pulau Pinang Malaysia Faculty of Electrical Engineering Universiti Teknologi Malaysia Johor Malaysia Control Instrumentation and Automation Department Faculty of Electrical Engineering UTeM Melaka Malaysia Faculty of Electrical and Electronic Engineering Universiti Tun Hussein Onn Malaysia Johor Malaysia

ISBN: (纸本)9781467309615

This paper investigates the longitudinal wheel slip tracking control approach for ground vehicle. A mathematical model of a quarter vehicle undergoing a straight-line braking maneuver is used as the control model. Second order sliding mode (SOSM) control approach using super-twisting technique is proposed to manipulate the braking torque to control the wheel slip. The effectiveness of the SOSM is compared to the conventional sliding mode in the simulations of emergency straight line braking in Simulink. With the SOSM, the chattering phenomenon is eliminated, giving a smooth tracking trajectory and lower slip error and control effort. © 2012 IEEE.

关键词： Sliding mode control

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Vehicle stability enhancement based on second order sliding mode control

Vehicle stability enhancement based on second order sliding ...

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2012 IEEE International Conference on control system, Computing and engineering, ICCSCE 2012

作者： Hamzah, Norhazimi Aripin, M Khairi Sam, Yahaya Md Selamat, Hazlina Ismail, Muhamad Fahezal Faculty of Electrical Engineering Universiti Teknologi MARA Pulau Pinang Malaysia Control Instrumentation and Automation Department Faculty of Electrical Engineering UTeM Melaka Malaysia Faculty of Electrical Engineering Universiti Teknologi Malaysia Johor Malaysia Industrial Automation Section UniklMfi Selangor Malaysia

ISBN: (纸本)9781467331432

The vehicle handling and stability in emergency situation can be enhanced with direct yaw moment control (DYC). In this paper, a new controller using super twisting technique based on second order sliding mode control (SOSM) is proposed for the yaw moment control. The controller is designed based on two degree of freedom (2DOF) nonlinear model. The effectiveness of the proposed controller is compared to PI controller and conventional sliding mode controller by co-simulations in CarSim and Matlab/Simulink. The results show that the SOSM give better performance in tracking the desired response necessary for the vehicle handling and stability. In addition, the chattering phenomenon is also reduced, giving a smooth tracking trajectory. © 2012 IEEE.

关键词： controllers

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Yaw stability improvement for four-wheel active steering vehicle using sliding mode control

Yaw stability improvement for four-wheel active steering veh...

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2012 IEEE 8th International Colloquium on Signal Processing and Its Applications, CSPA 2012

作者： Hamzah, Norhazimi Sam, Yahaya Md Selamat, Hazlina Aripin, M. Khairi Ismail, Muhamad Fahezal Faculty of Electrical Engineering Universiti Teknologi MARA Pulau Pinang Malaysia Faculty of Electrical Engineering Universiti Teknologi Malaysia Johor Malaysia Control Instrumentation and Automation Department Faculty of Electrical Engineering UTeM Melaka Malaysia Industrial Automation Section UniklMfi Selangor Malaysia

ISBN: (纸本)9781467309615

Active steering control is one of the approach that can be used to improve the vehicle's lateral and yaw stability. By combining active front steering and active rear steering control, the vehicle's handling and stability can be improved via four wheel active steering (4WAS) control. In this paper, a robust control algorithm of sliding mode control is designed for 4WAS vehicle. Single track 2 d.o.f linear model is utilized for controller design and simulation purpose. Simulation for 4WAS and front steering (AFS) is carried out in Simulink for step steer and double lane change maneuver to verify the effectiveness of the proposed control system. The result shows that the 4WAS perform better than the AFS in tracking the desired response trajectory. © 2012 IEEE.

关键词： Sliding mode control

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Transfer issues of control optimizing combustion from small-scale to medium-scale biomass-fired boilers

Transfer issues of control optimizing combustion from small-...

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8th Power Plant and Power system control Symposium, PPPSC 2012

作者： Oswald, Cyril Plaček, Viktor Šulc, Bohumil Hošovský, Alexander Department of Instrumentation and Control Engineering Faculty of Mechanical Engineering Czech Technical University Prague Czech Republic Department of Mathematics Informatics and Cybernetics Faculty of Manufacturing Technologies Technical University of Košice 080 01 Prešov Slovakia

ISBN: (纸本)9783902823243

The quick development of biomass fired boilers increased the attention being paid to the ecological and economical aspects of their operation. A very important role in the process of adapting to harder regulations has been the control technology replacing older simple solutions. Lately, we have been offered a very interesting opportunity to make use of our experience with small-scale boiler control which has been gradually equipped with instruments for more sophisticated experiments and to transfer verified control algorithms to a district heating boiler of medium-scale size. The following text describes what has been achieved in experiments with the small-scale boiler and how this can be transferred to bigger scale one. An algorithm to optimize the combustion process from the efficiency point of view, as well as harmful emission reduction is described in detail.

关键词： Combustion

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Parameters measurement of observed object from recording

Parameters measurement of observed object from recording

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2012 13th International Carpathian control Conference, ICCC 2012

作者： Licev, Lacezar Zajic, Petr Babiuch, Marek Farana, Radim Department of Computer Science VSB Technical University of Ostrava Faculty of Electrical Engineering and Computer Science Ostrava Czech Republic Department of Control Systems and Instrumentation VSB Technical University of Ostrava Faculty of Mechanical Engineering Ostrava Czech Republic

ISBN: (纸本)9781457718687

This paper describes development of the module, which analyzes medical images and its use is also possible in sectors other than medicine. A software module can base on events captured on the ECG graph store images, which the event concerned. Since the ECG chart is only available on video, you will need to analyze this video and chart to properly recognize it. This module plugged together with two other simultaneously developed modules in the FOTOM 2009 will make a brand new version of this application FOTOMNG. © 2012 IEEE.

关键词： Electrocardiograms

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New approaches in 2D modeling of objects and points of interest

New approaches in 2D modeling of objects and points of inter...

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2012 13th International Carpathian control Conference, ICCC 2012

作者： Licev, Lacezar Pytlik, Tomas Babiuch, Marek Farana, Radim Department of Computer Science VSB Technical University of Ostrava Faculty of Electrical Engineering and Computer Science Ostrava Czech Republic Department of Control Systems and Instrumentation VSB Technical University of Ostrava Faculty of Mechanical Engineering Ostrava Czech Republic

ISBN: (纸本)9781457718687

This paper describes the processing of photographs in the newly created module for 2D modeling, which will be integrated into the system FOTOM NG. This is a usable application in medicine to analyze images of probes and non-invasive examination developed at the department of computer science of the technical university of Ostrava. The module will be his purpose and functionality to build on a previous version of module Fotom2 of system FOTOM, but will be expanded to meet the requirements of a modern system. The module will be implemented on the NetBeans Platform. In the paper we describe the 2D modeling, analyzing the existing software requirements specifications for the new module, selecting software tools, and the subsequent design and implementation. © 2012 IEEE.

关键词： Photography

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Hybridized GA-optimization of neural dynamic model for nonlinear process

Hybridized GA-optimization of neural dynamic model for nonli...

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2012 13th International Carpathian control Conference, ICCC 2012

作者： Hošovský, Alexander Židek, Kamil Oswald, Cyril Department of Mathematics Informatics and Cybernetics Faculty of Manufacturing Technologies with Seat in Prešov Technical University of Košice Prešov Slovakia Department of Instrumentation and Control Engineering Faculty of Engineering Czech Technical University of Prague Prague Czech Republic

ISBN: (纸本)9781457718687

Neural networks as universal approximators possess capability to model complex nonlinear phenomena. However, when almost nothing is known about the modeled dynamic process it is difficult to determine important parameters like the number of neurons or the size of regressor vector (dynamic order). In order to avoid suboptimal settings for a dynamic model using trial-and-error method, genetic algorithm is used for optimizing the neural dynamic model. To improve the results even more, the genetic optimization is hybridized with a local optimizer in the form of Levenberg-Marquardt algorithm commonly used for neural network training. Here a neural model of biomass-fired boiler emissions is considered, which is eventually intended for predictive control. Series-parallel NARX model is used with two hidden layer neural network and tan-sigmoid transfer functions. The simpler neural model structure will be computationally less expensive what is important for online predictive control. The results confirm the capability of this method to achieve simpler network structures with errors comparable to the case when trial-and-error settings were previously used. © 2012 IEEE.

关键词： Genetic algorithms

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Model-free PID controller Autotuning Directly Applicable to Real control Loops

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IFAC Proceedings Volumes 2012年第3期45卷 536-541页

作者： Stanislav Vrána Bohumil Šulc Czech Technical University in Prague Faculty of mechanical Engineering Department of Instrumentation & Control Engineering Prague Czech Republic

Many PID controller tuning methods have been presented since Ziegler and Nichols published their method in 1942, but none of those methods were used widely. The Ziegler and Nichols method has several advantages over newer methods: it is easy to conduct, the relations for controller parameter computation are simple, the method relies on experiment, and it does not require any model. Newer tuning methods are usually model-based, but the model-free methods are preferred in common industrial practice. This paper presents a model-free tuning method that respects the “restrictions” given by the easy usage of the Ziegler and Nichols method. The method is model-free, and new controller parameter computation is based on evaluation of control quality indicators. The evaluation is done without disconnection of the controller and with no other control restrictions during control.

关键词： PID control selftuning control harmonic excitation model-free

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Approach to gasoline engine faults diagnosis based on crankshaft instantaneous angular acceleration

Approach to gasoline engine faults diagnosis based on cranks...

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2012 13th International Carpathian control Conference, ICCC 2012

作者： Khac, Binh Le Jiri, Tuma Department of Control Systems and Instrumentation Faculty of Mechanical Engineering VSB - Technical University of Ostrava 17. listopadu 708 33 Ostrava - Poruba Czech Republic

ISBN: (纸本)9781457718687

Gasoline engine is a complex power generating machines and used widely in automotive industry, which the failure rate is high. Carrying out the gasoline engine fault diagnostic methods have been studied and still a lasting topic for scientists. Crankshaft instantaneous angular acceleration, which evaluated by second derivative of the crankshaft rotation respect to time contains information for fault diagnosis. In this paper, phase modulation signal is derived from the phase of an analytical signal which evaluated by using the Hilbert Transform technique. To verify the signal analysis technique, the engine model created originally by John J. Moskwa needs to be extended to produce fluctuation of the crankshaft angular acceleration and to implement the extended model into the dSPACE equipment to control and diagnose the engine. © 2012 IEEE.

关键词： Crankshafts

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