Optimizing the Variability in the Deformation of a Biomimetic Pinna

dc.contributor.authorAlenezi, Abdulrahman Obaiden
dc.contributor.committeechairMueller, Rolfen
dc.contributor.committeememberBartlett, Michael Daviden
dc.contributor.committeememberLeonessa, Alexanderen
dc.contributor.committeememberCorradi, Marcoen
dc.contributor.departmentMechanical Engineeringen
dc.description.abstractBats are noted for having extremely powerful biosonar systems that enable them to move through and hunt through the thick foliage. They have a single emitter (mouth or nose) and two receivers in their biosonar system (ears). Some bat species, such as those belonging to the group's rhinophid and hipposiderid, feature intricate pinna motion patterns. These pinnae are divided into two groups: stiff movements and non-rigid motions. To understand how pinna sense worked has been studied in this thesis. The rigid pinna movements displayed a significantly different rotation, with revolutions axes spanning 180° in horizontal and curvature, according to axis-angle representations. The classification of landmarks on the pinna surface has explained two types of non-stiffed pinna movements. Additionally, a bio-inspired pinna has been used to explore the acoustic impact of the stiff pinna movements. All the given results showed precise accuracy in the motion of variance bats pinnae. The research initiative was initiated with a comprehensive exploration of various design concepts, primarily focused on elucidating the intricate interplay between actuator geometry and the resultant deformation of the pinna. Employing a structured design code facilitated the generation of an array of configurations, each subject to stringent conditions and parameter settings necessitating subsequent validation. After this design exploration, a tri-tiered hierarchy of forces, encompassing nominal, intermediate, and elevated magnitudes, was applied to instigate a systematic optimization process aimed at determining the most favorable deformation pattern. Computational simulations leveraging Finite Element Analysis (FEA) were conducted, accompanied by a rigorous material characterization procedure, to effectively quantify the extent of deformation across the array of configurations. A consequential phase of the investigation involved the implementation of Principal Component Analysis (PCA) to differentiate the inherent variability within the different deformation arrangements, shedding light on their relative structural and morphological distinctions. The culmination of the study encompassed the utilization of the Genetic Algorithm (GA), a sophisticated optimization technique, to facilitate the fine-tuning of deformation patterns in pursuit of the overarching goal: the deliberate induction of substantial and diverse variations in pinna morphology. In summary, the research trajectory progressed sequentially through design conceptualization, force-induced optimization, computational simulations incorporating FEA and material characterization, Variability analysis via PCA, and culminated in the deployment of the GA to achieve the prime objective of inducing pronounced variability in pinna configuration. The work was done as following, starting with design concepts, the main benefit of this is to understand how the geometry of actuator affects the pinna deformation. Using the design code to present several configurations that must have conditions and parameters to be validated. After that applying 3 different forces (zero, medium, and high) to get the optimization for pattern. Applying the FEA simulations with help of material characterization to display the displacement of the arrangements. Finally doing the Variability analysis by using the principal component analysis. Then concluding the work by using the Genetic algorithm for optimizations to reach the main goal which is large variability in the pinna shape.en
dc.description.abstractgeneralThis research delves into the fascinating world of bats and their extraordinary biosonar systems, specifically focusing on the intricate mechanics of their pinnae—the external ear structures. Bats, known for their remarkable ability to navigate dense foliage using biosonar, have been a subject of keen scientific interest. The study explores the design and functionality of bat pinnae, with a special emphasis on understanding how different movements contribute to their biosonar capabilities. The investigation began with a comprehensive exploration of design concepts, aiming to unravel the complex relationship between actuator geometry and pinna deformation. A structured design code was employed to generate a range of configurations, each subjected to stringent conditions and parameters, requiring subsequent validation. Following this design exploration, a three-tiered hierarchy of forces—ranging from nominal to elevated magnitudes—was applied to initiate a systematic optimization process. Computational simulations, utilizing Finite Element Analysis (FEA) and rigorous material characterization, were conducted to quantify the extent of pinna deformation across various configurations. The study further implemented Principal Component Analysis (PCA) to discern inherent variability in different deformation patterns, shedding light on their structural and morphological distinctions. The research culminated in the deployment of the Genetic Algorithm (GA), a sophisticated optimization technique, to deliberately induce substantial and diverse variations in pinna morphology. In summary, the research trajectory progressed from design conceptualization to force-induced optimization, incorporating computational simulations and material characterization. Variability analysis through PCA provided insights into structural distinctions, and the use of the Genetic Algorithm aimed at achieving the overarching goal of inducing pronounced variability in pinna configuration. This work not only enhances our understanding of bat biosonar systems but also offers potential applications in bio-inspired design and acoustic engineering.en
dc.description.degreeDoctor of Philosophyen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.subjectand biosonaren
dc.titleOptimizing the Variability in the Deformation of a Biomimetic Pinnaen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.nameDoctor of Philosophyen


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