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The collection of short stories presented in this thesis seeks to form a counter-narrative to the stigmas associated with mental illness and trauma through the portrayal of protagonists suffering from or affected by such issues. Individuals influenced by mental illness and/or trauma are not "others" deserving ostracization but fellow human beings searching for hope in a world too often touched by sorrow. The first three stories within this thesis address protagonists directly impacted by mental illness. "Twin Magnolias" follows Maggie Briggins, an elderly woman battling both paranoia and Alzheimer's simultaneously in a search for reality. "Fabergé" explores Candy Friedman's depression and relationship to her past as a ballerina. In "A Few Flowers to Hold," Leo Berns finds closure from a past filled with trauma and guilt through the connections his schizophrenia provides him. In contrast, the final two stories depict the lives of protagonists indirectly affected by mental illness. After the stillbirth of his daughter, Richard Glim finds hope in an unlikely place, a nursing home. Finally, the title piece of the collection explores and compares differing views of caregiving through the lives of Maggie Briggins' daughter and granddaughter. These perspectives demonstrate that mental illness and/or trauma are not what define a person but are simply a part of their lives. The number of individuals seeking help with mental health issues and trauma, especially among the younger generations, seems to be skyrocketing. Therefore, a larger body of literature that deals with such topics in a respectful and humanizing way is needed if our culture is to lovingly embrace individuals whose lives have been changed by these issues.

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This study involves the modeling and optimization of heterogeneous (HG) blankets for improved reduction of the sound transmission through double-panel systems at low frequencies. HG blankets consist of poro-elastic media with small, embedded masses, operating similar to a distributed mass-spring-damper system. Although most traditional poro-elastic materials have failed to effectively reduce low-frequency, radiated sound from structures, HG blankets show significant potential. A design tool predicting the response of a single-bay double panel system (DPS) with, acoustic cavity, HG blanket and radiated field, later a multi-bay DPS with frames, stringers, mounts, and four HG blankets, was developed and experimentally validated using impedance and mobility methods (IMM). A novel impedance matrix formulation for the HG blanket is derived and coupled to the DPS using an assembled matrix approach derived from the IMM. Genetic algorithms coupled with the previously described design tool of the DPS with the HG blanket treatment can optimize HG blanket design. This study presents a comparison of the performance obtained using the genetic algorithm optimization routine and a novel interactive optimization routine based on sequential addition of masses in the blanket. This research offers a detailed analysis of the behavior of the mass inclusions, highlighting controlled stiffness variation of the mass-spring-damper systems inside the HG blanket. A novel, empirical approach to predict the natural frequency of different mass shapes embedded in porous media was derived and experimentally verified for many different types of porous media. In addition, simplifying a model for poro-elastic materials for low frequencies that Biot and Allard originally proposed and implementing basic elastomechanical solutions produce a novel analytical approach to describe the interaction of the mass inclusions with a poro-elastic layer. A full-scale fuselage experiment performed on a Gulfstream section involves using the design tool for the positions of the mass inclusions, and the results of the previously described empirical approach facilitate tuning of the natural frequencies of the mass inclusions to the desired natural frequencies. The presented results indicate that proper tuning of the HG blankets can result in broadband noise reduction below 500Hz with less than 10% added mass. / Ph. D.

This thesis presents the development and testing of distributed vibration absorber designs with specific application to heavy plates for the reduction of vibration and sound radiation. Two particular designs, already under investigation for use on thin panels or composite materials, were adapted to passively reduce broadband vibration and noise from large and heavy plates. These absorbers are referred to as Distributed Vibration Absorbers [DVAs] and Heterogeneous [HG] Blankets. Numerical models were developed, based on the theory of sound propagation through layered media and the vibration of plates, to simulate the performance of such absorbers for a variety of applications and media characteristics. The new absorber designs were then tested on a large, marine-type plate (4 feet by 2 feet by 1/4 inch) and showed both broadband noise and vibration control from 60 Hz to 5 kHz. DVAs could reduce the vibrating plate resonance magnitudes on the order of 15 dB at their tuning frequencies while providing overall vibration reduction of 5 dB or greater at higher frequencies. HG blankets were also capable of reducing plate resonance vibration up to 15 dB at their tuning frequencies and produced overall vibration reduction of 5 dB at higher frequencies. These absorbers are entirely passive, i.e. requiring no controller or prior modal testing of the structure, were placed randomly during testing, and are designed to contribute less than 10% additional mass to the structure, making them a robust vibration and noise control solution. / Master of Science