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You searched for +publisher:"Old Dominion University" +contributor:("Sebastian Y. Bawab"). Showing records 1 – 3 of 3 total matches.

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1. Wright, Cody Alexander. Thermo-Mechanical System Identification of a Shape Memory Alloy Actuated Mechanism.

Degree: MS, Mechanical Engineering, 2016, Old Dominion University

Shape memory alloy (SMA) actuators paired in an antagonistic arrangement can be used to produce mechanisms that replicate human biomechanics. To investigate this proposal, the biomechanical articulation of the elbow by means of the biceps brachii muscle is compared with that of a SMA actuated arm. This is accomplished by parametric analysis of a crank-slider kinematic mechanism actuated, first, with an experimentally characterized SMA wire and then an idealized musculotendon actuator based on actuation properties of muscles published in the literature. Next, equations of motion for the system dynamics of the SMA actuated mechanism are derived and phase portrait analysis is conducted varying system parameters around different operating points. The eigenvalues of the differential equation are examined around equilibrium points and a stiffness ratio metric is proposed to characterize dynamic stability based on system parameters. Next, a heat transfer model is proposed and energy analysis is conducted on each stage of phase transformation for the SMA wire. The unknown parameters in the heat transfer model are theoretically derived and an experimental system identification is conducted. A proof of concept antagonistic SMA actuated mechanism is designed and kinematic analysis is conducted on an experimental prototype. Advisors/Committee Members: Onur Bilgen, Sebastian Y. Bawab, Sushi Chaturvedi.

Subjects/Keywords: Actuation; Dynamics; Heat transfer; Shape memory alloy; Smart materials; System identification; Mechanical Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Wright, C. A. (2016). Thermo-Mechanical System Identification of a Shape Memory Alloy Actuated Mechanism. (Thesis). Old Dominion University. Retrieved from 9781369536881 ; https://digitalcommons.odu.edu/mae_etds/20

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Wright, Cody Alexander. “Thermo-Mechanical System Identification of a Shape Memory Alloy Actuated Mechanism.” 2016. Thesis, Old Dominion University. Accessed February 20, 2019. 9781369536881 ; https://digitalcommons.odu.edu/mae_etds/20.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Wright, Cody Alexander. “Thermo-Mechanical System Identification of a Shape Memory Alloy Actuated Mechanism.” 2016. Web. 20 Feb 2019.

Vancouver:

Wright CA. Thermo-Mechanical System Identification of a Shape Memory Alloy Actuated Mechanism. [Internet] [Thesis]. Old Dominion University; 2016. [cited 2019 Feb 20]. Available from: 9781369536881 ; https://digitalcommons.odu.edu/mae_etds/20.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wright CA. Thermo-Mechanical System Identification of a Shape Memory Alloy Actuated Mechanism. [Thesis]. Old Dominion University; 2016. Available from: 9781369536881 ; https://digitalcommons.odu.edu/mae_etds/20

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. Kim, Jinhyuk. The Effect of Bone and Ligament Morphology of Ankle Joint Loading in the Neutral Position.

Degree: MS, Mechanical & Aerospace Engineering, 2017, Old Dominion University

Computational modeling of joints is used to investigate the effect of injuries, to plan surgeries, and to answer questions about joints that cannot be answered experimentally. Existing models of the ankle joint are moving toward being able to model specific patients, however, they do not include all of the anatomy (e.g., bones and/or ligaments) and have restrictive boundary conditions. These simplification in anatomy are made to minimize pre-processing and computation time. Because biomechanical modeling is increasingly focused on the implementation of patient specific cases, the effects of including more anatomical structures and determining how they affect the model results is necessary. Therefore, the purpose of this study was to develop a 3D Finite Element (FE) model of the ankle joint complex (i.e., tibia, fibula, talus, and calcaneus) with 13 major ligaments, and to determine how modeling the structure of the ligaments and the number of bone affected the contact stress in the talocrural joint (i.e., the joint between the tibia/fibula and the talus). A finite element model was developed in FEBio (FEBio, Salt Lake City, UT) from the CT data obtained from one cadaver. The model included bones, cartilage, and ligaments. Ligaments were modeled as tension-only linear springs, and applied for more than one spring for each of 13 major ligaments. Morphology of the spring was set as parallel or X configuration. The stress in the joint between the tibia and talus showed differences with the different number of bones. Especially, the stress of the three bone FE model was higher than ankle complex configuration with the same number of ligaments. The stresses were measured in Talocrural Joint 2 including tibia, talus, and 6 springs and Talocrural Joint 3 including tibia, talus, fibula, calcaneus, and 12 springs from 2.0541 MPa to 2.3077 MPa. The big difference between the models was the existence/non-existence of calcaneus. It demonstrates that the stress contour of Talocrural Joint 3 was had the most similar pattern with the Novel pressure data obtained from experiment. Advisors/Committee Members: Stacie I. Ringleb, Sebastian Y. Bawab, Gene Hou.

Subjects/Keywords: Ankle joint; Modeling; FE model; Biomechanical Engineering; Computational Engineering; Mechanical Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Kim, J. (2017). The Effect of Bone and Ligament Morphology of Ankle Joint Loading in the Neutral Position. (Thesis). Old Dominion University. Retrieved from 9780355407952 ; https://digitalcommons.odu.edu/mae_etds/27

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Kim, Jinhyuk. “The Effect of Bone and Ligament Morphology of Ankle Joint Loading in the Neutral Position.” 2017. Thesis, Old Dominion University. Accessed February 20, 2019. 9780355407952 ; https://digitalcommons.odu.edu/mae_etds/27.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Kim, Jinhyuk. “The Effect of Bone and Ligament Morphology of Ankle Joint Loading in the Neutral Position.” 2017. Web. 20 Feb 2019.

Vancouver:

Kim J. The Effect of Bone and Ligament Morphology of Ankle Joint Loading in the Neutral Position. [Internet] [Thesis]. Old Dominion University; 2017. [cited 2019 Feb 20]. Available from: 9780355407952 ; https://digitalcommons.odu.edu/mae_etds/27.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kim J. The Effect of Bone and Ligament Morphology of Ankle Joint Loading in the Neutral Position. [Thesis]. Old Dominion University; 2017. Available from: 9780355407952 ; https://digitalcommons.odu.edu/mae_etds/27

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

3. Zarepoor, Masoud. Constrained-Energy Cross-Well Actuation of Bistable Structures.

Degree: PhD, Mechanical & Aerospace Engineering, 2016, Old Dominion University

Bistable structures have two stable equilibrium positions and can be utilized to maintain a specific static shape with no energy consumption. This dissertation focuses on the minimum required energy for performing snap-through of a bistable structure. Snap-through is the motion of a bistable structure from one stable equilibrium position to the other. This research uses the Duffing-Holmes equation as a one-degree-of-freedom representative model of a bistable structure, and this nonlinear equation is solved to calculate the required energy for cross-well oscillation. The research identifies several unique features of the response of a bistable system subjected to force and energy constraints. The research also shows how the required energy for cross-well oscillation varies as a function of damping ratio, frequency ratio, and for different values of excitation force amplitudes. The response of the bistable system is compared to a mono-stable linear system with the same parameters. A magneto-elastic bistable beam was fabricated and tested to validate theoretical predictions. Advisors/Committee Members: Onur Bilgen, Sebastian Y. Bawab, Mounir Laroussi, Dipankar Ghosh.

Subjects/Keywords: Bistable structures; Cross-well actuation; Duffing-Holmes equation; Magneto-elastic bistable beam; Piezoelectric material; Mechanical Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Zarepoor, M. (2016). Constrained-Energy Cross-Well Actuation of Bistable Structures. (Doctoral Dissertation). Old Dominion University. Retrieved from 9781369183696 ; https://digitalcommons.odu.edu/mae_etds/17

Chicago Manual of Style (16th Edition):

Zarepoor, Masoud. “Constrained-Energy Cross-Well Actuation of Bistable Structures.” 2016. Doctoral Dissertation, Old Dominion University. Accessed February 20, 2019. 9781369183696 ; https://digitalcommons.odu.edu/mae_etds/17.

MLA Handbook (7th Edition):

Zarepoor, Masoud. “Constrained-Energy Cross-Well Actuation of Bistable Structures.” 2016. Web. 20 Feb 2019.

Vancouver:

Zarepoor M. Constrained-Energy Cross-Well Actuation of Bistable Structures. [Internet] [Doctoral dissertation]. Old Dominion University; 2016. [cited 2019 Feb 20]. Available from: 9781369183696 ; https://digitalcommons.odu.edu/mae_etds/17.

Council of Science Editors:

Zarepoor M. Constrained-Energy Cross-Well Actuation of Bistable Structures. [Doctoral Dissertation]. Old Dominion University; 2016. Available from: 9781369183696 ; https://digitalcommons.odu.edu/mae_etds/17

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