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 316 for “"feedforward"”.
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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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Learning dynamics in feedforward neural networks
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Modeling human vision using feedforward neural networks
In this thesis, we discuss the implementation, characterization, and evaluation of a new computational model for human vision. Our goal is to understand the mechanisms enabling invariant perception under scaling, translation, and clutter. The model is based on I-Theory [50], and uses convolutional …
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Adaptive feedforward control of broadband structural vibration
… semi-infinite systems. Here, four new adaptive feedforward control algorithms were developed for attenuating the response generated by finite structural systems. The algorithms are based on the filtered-X Least Mean Square (LMS) adaptive algorithm. A system identification of the plant control …
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Feedforward and Feedback Signals in the Olfactory System
… frequency oscillations in olfactory bulb carry feedforward signals to anterior piriform cortex whereas feedback from the aPC is predominantly carried by lower frequency oscillations. Similar frequency multiplexing of feedforward and feedback signals has been observed in other sensory systems, …
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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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Optimum Actuator Grouping in Feedforward Active Control Applications
… the controller for differences between the feedforward compensator coefficients. The backpropagation neural network algorithm provides the proper procedure to determine the minimum of this cost function. The main disadvantage of using a stochastic gradient technique, while searching the …
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Multi-axis analog adaptive feedforward cancellation of cryocooler vibration
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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Design of feedforward active ripple filters for power converters
… current sensing and injection methods for feedforward active filter applications including a Rogowski-Coil sensor, a transformer sensor, a class A injector, and a current transformer based injector. The advantages, tradeoffs, and limitation of each approach are discussed in detail. This …
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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
The key conclusions of this research are: 1. The EFXLMS algorithm demonstrated superior performance than the FXLMS algorithm during fast adaptive processes, in particular for non-stationary inputs. 2. Good attenuation of the peak. and root-mean-square (rms) values of the structural responses using …
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Sensitivity of Feedforward Neural Networks to Harsh Computing Environments
Neural Networks have proven themselves very adept at solving a wide variety of problems, in particular they accel at image processing. However, it remains unknown how well they perform under memory errors. This thesis focuses on the robustness of neural networks under memory errors, specifically …
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Adaptive feedforward cancellation viewed from an oscillator amplitude control perspective
… stability, and robustness properties of Adaptive Feedforward Cancellation (AFC) for use on fast tool servos in high-precision turning applications. Previous work has shown that classical control techniques can be used to analyze the stability and robustness of an AFC loop. However, determination …
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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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The Role of Feedforward-Enabled Predictive Analytics in Changing Mental Models
… view and generally lack a predictive (feedforward-enabled) view of the likely outcomes of the decision. The purpose of this research is to study how changes in mental models can be facilitated through this feedforward mechanisms within the DSS tool. This research used a mixed method …
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A feedforward/feedback approach to retrieval of a tethered sub-satellite
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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A Principal Component Algorithm for Feedforward Active Noise and Vibration Control
… for large control systems used to implement feedforward control of single frequency disturbances. The algorithm is a transform domain version of the multichannel filtered-x LMS algorithm. The transformation corresponds to the principal components of the transfer function matrix between the …
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Optimum design for feedforward structural-acoustic control of complex structural systems
An efficient design formulation for feedforward Active Structural Acoustic Control (ASAC) systems for complex structures and disturbances is presented. The approach consists in a multi-level optimization procedure. The upper level part is carried out in the modal domain, where the optimum modal …
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