This paper presents a fault tolerant control (FTC)-architecture for trajectory tracking, where generalized actuator faults are online diagnosed and compensated for by the control system. Employing least-squares deriva...
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ISBN:
(纸本)9781424474264
This paper presents a fault tolerant control (FTC)-architecture for trajectory tracking, where generalized actuator faults are online diagnosed and compensated for by the control system. Employing least-squares derivative estimators for identifying the faults inserts time-delays into the control loop. When a reference trajectory is to be tracked, the closed FTC loop represents a nonlinear time-varying time-delay system. Linearizing its dynamics around the reference trajectory makes it possible to determine tolerable delay times, which allows to deduce admissible intervals for the values of the FTC parameters. The FTC scheme is illustrated by simulations of an underactuated satellite with faulty actuators.
To enhance power output and reduce cost for practical application of microbial fuel cell (MFC), extensive experiments have done to study performance optimization of lab-made mediator-less MFC. Saccharomyces cerevisiae...
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This paper deals with a possibility of non-destructive diagnostics of solid objects by software analysis of vibration spectrum by accelerometers. By a use of MATLAB platform, a processing and information evaluation fr...
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ISBN:
(纸本)9788070438657
This paper deals with a possibility of non-destructive diagnostics of solid objects by software analysis of vibration spectrum by accelerometers. By a use of MATLAB platform, a processing and information evaluation from accelerometer is possible. Accelerometer is placed on the measured object. The analog signal needs to be digitized by a special I/O device to be processed offline with FFT (Fast Fourier Transformation). The power spectrum is then examined by developed evaluating procedures.
The paper presents an experimental verification of conventional PI and PID controller design methods. Nine different synthesis techniques were used to control of airflow speed in laboratory model of hotair tunnel, mos...
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The paper presents an experimental verification of conventional PI and PID controller design methods. Nine different synthesis techniques were used to control of airflow speed in laboratory model of hotair tunnel, most of them for both PI and PID version. In the first instance the controlled plant was identified in order to obtain a linear mathematical model and then the controllers were designed using studied methods. The controllers were tested in simulations and subsequently implemented under real conditions. The obtained control results have been compared and analyzed.
Modeling of complex dynamic systems, which are very complicated to establish mathematical models, requires new and modern methodologies that will exploit the existing expert knowledge, human experience and historical ...
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Modeling of complex dynamic systems, which are very complicated to establish mathematical models, requires new and modern methodologies that will exploit the existing expert knowledge, human experience and historical data. Fuzzy cognitive maps are very suitable, simple, and powerful tools for simulation and analysis of these kinds of dynamic systems. However, human experts are subjective and can handle only relatively simple fuzzy cognitive maps;therefore, there is a need of developing new approaches for an automated generation of fuzzy cognitive maps using historical data. In this study, a new learning algorithm, which is called Big Bang-Big Crunch, is proposed for the first time in literature for an automated generation of fuzzy cognitive maps from data. Two real-world examples;namely a process control system and radiation therapy process, and one synthetic model are used to emphasize the effectiveness and usefulness of the proposed methodology.
The paper deals with comparison of different continuous-time strategies applied to control of singleinput single-output (SISO) periodically time-varying systems with delay. The first method is based on the fractional ...
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The paper deals with comparison of different continuous-time strategies applied to control of singleinput single-output (SISO) periodically time-varying systems with delay. The first method is based on the fractional representation in the ring of proper and stable rational functions (RPS), general solutions of Diophantine equations and conditions of divisibility while the other two methods use the modified Smith predictor structures in combination with standard forms for minimum of integral squared time error (ISTE) or design by Coefficient Diagram Method (CDM). The capabilities of all techniques are demonstrated on simulative examples for first and second order periodically time-varying time-delay systems. Moreover, various modifications and improvements, such as control structure with more degrees of freedom or utilization of disturbance controller are also included in the research.
Hydrostatic transmissions, also called hydrostatic gears, have been widely used in mobile working machines and off-road vehicles such as construction and agricultural machines. This kind of transmission offers importa...
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Hydrostatic transmissions, also called hydrostatic gears, have been widely used in mobile working machines and off-road vehicles such as construction and agricultural machines. This kind of transmission offers important advantages like continuously variable transmission with high power density, maximum tractive force at low speeds and reversing without changing gear. The automatic electronic control of hydrostatic transmissions, which depend on a number of measurable values, has become more common in industrial practice. To ensure the reliability and safety at least a two-channel redundant system for the measuring channels is required. In this paper, a general model-based approach using a Takagi-Sugeno (T-S) fuzzy observer for analytical redundancy of the oil pressure measuring process in hydrostatic transmissions is developed. It has been shown by experimental results that this approach can be used to estimate the pressure values under varying load conditions and different driving situations.
In this paper an observer-based fault detection approach for a class of nonlinear systems, which can be modeled by Takagi-Sugeno (TS) fuzzy models, is presented. We propose a sliding mode fuzzy observer that deals wit...
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ISBN:
(纸本)9781424477456
In this paper an observer-based fault detection approach for a class of nonlinear systems, which can be modeled by Takagi-Sugeno (TS) fuzzy models, is presented. We propose a sliding mode fuzzy observer that deals with unmeasurable premise variables, bounded uncertainties in the plant and allows fault estimation based on an equivalent output error injection approach. Necessary conditions for the existence of the robust observer are derived from sliding mode theory [10]. Stability is ensured by linear matrix inequality (LMI) based sufficient conditions. An illustrative example demonstrates the effectiveness of the proposed scheme.
One of the prerequisites for AFM based nanomanipulation is that the tip position can be controlled accurately, while this prerequisite is still hindered by the large model uncertainties aroused from PZT nonlinearity s...
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Technology of energy self-supply which can improve the work efficiency and extend the work time is significant for underwater carrier, such as underwater vehicle. As one of the renewable energy, the absorption and uti...
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Technology of energy self-supply which can improve the work efficiency and extend the work time is significant for underwater carrier, such as underwater vehicle. As one of the renewable energy, the absorption and utilization of wave energy is always an important research field home and abroad, and energy absorption efficiency is the key. A wave energy absorption system based on inertial pendulum is presented, and dynamics equations are established. A method based on PSORBF neural network is adopted to model in time domain. The results obtained by simulation software and by neural network are compared, which validate the method used to be correct and make basis on future research.
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