Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 48 for “"feedforward control"”.
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Feedforward control of binary distillation
… two sets of functions showed that the simple feedforward controller transfer functions based upon the linear model should provide adequate control for binary distillation columns in the low frequency range (below a frequency of 1.6 radians per dimensionless time -- dimensionless time is …
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Adaptive feedforward control of broadband structural vibration
Active control of noise and vibration has been previously demonstrated in finite and infinite systems undergoing single and multiple-frequency excitations. Control of broadband noise and vibration has also been reported, but it tends to be limited to infinite and semi-infinite systems. Here, four …
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Time average feedforward control techniques for time varying systems
Adaptive FeedforWard algorithms have been successfully applied in the active control of sound and vibrations~ Current approaches, such as the Filtered-X Least Mean Square algorithm, are limited in adaptability and applicability by the computationally intensive system identification process. The …
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Hybrid adaptive feedforward control of structures to seismic inputs
… of the structural responses using the hybrid control system were observed for most of the real accelerograms. It was also observed that the hybrid control system always improved the performance of the passive control system. 3. Peak. structural responses during sensor failures were observed to …
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Experimental evaluation of some feedforward control models for binary distillation
In this study four different feedforward control models were derived in order to hold overhead composition fixed. This task was performed by literature review on distillation dynamics and simulation, and automatic control system applications. A theoretical analysis of feedback control compared to …
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Implications of nonlinear suspension behaviour for feedforward control of road noise in cars
Active control offers a lightweight solution to the problem of low frequency structure-borne road noise in cars. Feedforward control of road noise is predominantly limited by the difficulty of finding reference signals that are highly coherent with the sound in the cabin. One factor that could …
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Feedforward temperature control using a heat flux microsensor
… flux measurements to provide the input for a feedforward temperature control loop is investigated. The feedforward loop is added to proportional and integral feedback control to increase the speed of the response to a disturbance. Comparison is made between the feedback and the feedback plus …
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Active Minimization of Acoustic Energy Density to Attenuate Radiated Noise from a Diesel Generator
The focus of this thesis was to use active noise control (ANC) to globally minimize the tonal and broadband noise radiating from a diesel generator enclosure. The major goal of this research was to show that minimizing the noise within the enclosure can lead to an overall sound pressure level (SPL) …
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Dynamic analysis and active control of lattice structures
… thesis presents an investigation of the factors controlling the performance of two forms of active vibration control applied to lattice structures, such as those used for space applications. The structure considered is based on a lattice structure assembled by NASA in 1984. It consists of a …
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Practical modelling and control implementation studies on a pH neutralization process pilot plant
… years the industrial application of advanced control techniques for the process industries has become more demanding, mainly due to the increasing complexity of the processes themselves as well as to enhanced requirements in terms of product quality and environmental factors. Therefore the …
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A regression-based approach for simulating feedfoward active noise control, with application to fluid-structure interaction problems
… a set of general numerical tools for simulating feedforward active noise control in the frequency domain. Feedforward control is numerically similar to linear least squares regression, and can take advantage of various numerical techniques developed in the statistics literature for use with …
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The influence of structural-acoustic coupling on the dynamic behaviour of a one-dimensional vibro-acoustic system
… of a vibro-acoustic system under passive/active control. The simplest model of a vibro-acoustic system one can consider is a one-dimensional acoustic cavity driven by a single-degree-of-freedom (SDOF) structure. This simple model is used to demonstrate the physical characteristics of the coupling …
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Robust Repetitive Control and Its Application
… The design, modeling, analysis and preliminary control design of the dual stage actuator are presented. The experimental results are also presented to demonstrate the effectiveness of dual stage actuator. Finally, TPRRC is also applied to a disk drive read-write head following tracking servo …
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Digital control of a multi-channel boundary-conduction-mode boost converter for power-factor-correction applications
This thesis focuses on the design of digital control schemes for multi-channel boundary-conduction-mode (BCM) boost converters. Multi-channel BCM boost converters are commonly used for the front-end power-factor-corrected (PFC) stage of isolated ac-dc power supplies due to the advantages of being …
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Control of Sound Transmission with Active-Passive Tiles
… applications of active sound transmission control require lightweight partitions with high transmission loss over a broad frequency range and simple control strategies. In this work an active-passive sound transmission control approach is investigated that potentially addresses these …
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Design of Active Structure Acoustic Control Systems Using Eigenassignment Approach
Active structural acoustic control (ASAC) in conjunction with the adaptive feedforward control has been proved to be an efficient practical approach to reduce structure-borne sound. ASAC works on the principles of reducing the vibration amplitude of the structure (modal reduction), as well as …
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Recurrent convolutional neural networks as models of biological object recognition
Deep feedforward neural network models of vision dominate in both computational neuroscience and engineering. However, the primate visual system contains abundant recurrent connections. In this thesis, we investigate the addition of recurrent connections to the popular framework of convolutional …
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Parametrized maneuvers for autonomous vehicles
… equations of motion and nonlinear state and control constraints without resorting to iterative optimization. Experimental application to a three degree-of-freedom rotorcraft testbed and the design of a stable feedforward control framework demonstrates the essential features of the method on …
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A novel approach to multiple reference frequency domain adaptive control
Adaptive feedforward control of any physical system, acoustical, vibrational or other, requires what is termed as an uncontrollable coherent reference signal. That is, a signal which is highly representative (coherent) of the disturbance to be controlled which is not affected by the control …
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Trajectory Tracking of a Statically-stable Biped with Two Degrees of Freedom
This research investigates the possibility of controlling a simple biped having two degrees of freedom only. The biped robot walked on large feet. Having large feet enabled the robot to stand on one leg stably. At any time, the robotà Âs center of gravity remained above the area covered by one of …
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