A novel procedure for the realization of a fractional-order PID loop-shaping controller, suitable for precision control of mechatronic systems, is introduced in this work. Exploiting appropriate tools, the controller ...
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A novel procedure for the realization of a fractional-order PID loop-shaping controller, suitable for precision control of mechatronic systems, is introduced in this work. Exploiting appropriate tools, the controller function is approximated as a whole, leading to a simple form of integer-order approximation, when compared to the case where each intermediate part of the PID transfer function is approximated. This leads to a direct implementation, composed of conventional active and passive elements. Simulation and experimental results, derived from the OrCAD PSpice simulator and a field-programmable analog array respectively, verify the efficient functionality of the proposed implementation procedure.
To meet the demanding requirements in the growing area of wireless sensing applications, some sensing platforms have included low-power application-specific hardware to process the sensor data for compression and pre-...
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ISBN:
(纸本)9781450334754
To meet the demanding requirements in the growing area of wireless sensing applications, some sensing platforms have included low-power application-specific hardware to process the sensor data for compression and pre-classification of the relevant information. While this additional hardware can reduce the overall power consumption of the system, a unique hardware solution is required for each application. To diminish this burden, we will demonstrate a reconfigurable analog/mixed-signal sensing platform. At the hardware-level, this platform consists of a reconfigurable integrated circuit containing many commonly used circuit components that can be connected in any configuration to perform sensor interfacing and ultra-low-power signal processing. At the software level, this platform provides a framework for abstracting the underlying hardware. We will demonstrate how our platform allows a developer to create applications ranging from standard sensor interfacing techniques to more complicated intelligent pre-processing and wake-up detection, without the necessity of circuit-level expertise.
A novel procedure for compact realization of complex, multiple-parameter impedance functions is introduced in this paper. The concept is based on the consideration of the whole impedance function and the approximation...
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ISBN:
(纸本)9781665418478
A novel procedure for compact realization of complex, multiple-parameter impedance functions is introduced in this paper. The concept is based on the consideration of the whole impedance function and the approximation of its frequency characteristics through a suitable curve-fitting-based algorithm, instead of separately approximating the intermediate terms of the function. In this way, the total impedance is implemented by a topology which is based on one transfer function, offering the benefit of reduced complexity. The impedance function that describes the electrical properties of edible drinks can be considered as a characteristic example and, therefore, is used for the verification of the proposed concept. Different samples of drinks, red wine from Bairrada, semi-skimmed and organic semi-skimmed milk, are considered with the behavior of the proposed schemes being evaluated through simulation and experimental results.
A novel procedure for the circuit implementation of the driving-point impedance of frequency-domain material models, constructed from fractional-order elements of arbitrary type and order, is introduced in this work. ...
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A novel procedure for the circuit implementation of the driving-point impedance of frequency-domain material models, constructed from fractional-order elements of arbitrary type and order, is introduced in this work. Following this newly introduced concept, instead of emulating separately each fractional-order element in the model under consideration, the direct emulation of the complete model can be achieved through the approximation of the total impedance function. The magnitude and phase frequency responses of the impedance function are first extracted and approximated through curve-fitting-based techniques. A rational integer-order driving-point impedance function is then obtained and realized using appropriately configured passive and/or active topologies. Comparison between the conventional method and the proposed method reveals that the achieved benefit is the significant reduction of the passive and/or active components count. Verification of the introduced concept is performed through circuit simulation results using OrCAD PSpice in the case of a root/ stem/electrode interface model, as well as through experimental results where the driving-point input impedance of the human respiratory system under different health conditions is synthesized on a field-programmable analog array device.
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