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Full-Text Articles in Engineering
Three Dimensional Stress Intensity Factor For Large Arrays Of Radial Internal Surface Cracks In A Cylindrical Pressure Vessel, Javier Pierola
Three Dimensional Stress Intensity Factor For Large Arrays Of Radial Internal Surface Cracks In A Cylindrical Pressure Vessel, Javier Pierola
FIU Electronic Theses and Dissertations
The objective of this study is to present the mode I stress intensity factor distribution (SIF) along the crack-front for a wide array of semicircular and semi-elliptical surface cracks inside of a pressurized thick-walled cylinder. A three-dimensional finite element package ANSYS is used to evaluate the SIF for multicracked cylinder with number of cracks from n=1 to 128, the ratio of crack-depth to the wall thickness a/t=0.05 to 0.6, the ellipticity of the crack (the crack-depth to the semi-crack length) a/c=0.2 to 1.5, the ratio of the outer to the inner radius ro/ ri=2. …
Performance Assessment Of Prosthetic Heart Valves Using Orifice Area Formulae And The Energy Index Method, Flavio Ballerini Souza Campos
Performance Assessment Of Prosthetic Heart Valves Using Orifice Area Formulae And The Energy Index Method, Flavio Ballerini Souza Campos
FIU Electronic Theses and Dissertations
Valve function is commonly assessed by effective orifice area (EOA) estimates using equations derived from conservation of mass and energy. Errors have been found with the method due to difficulties in determining the valve’s coefficient of discharge (Cd). The Cd, a factor that corrects the EOA for losses in the valvular wake region, has been shown previously to vary with the Reynolds number and valve geometry. In this study, a Cardio-Vascular Duplicator (CVD) is used to determine the Cd for three types of mitral valves, operating in modes ranging from normal to severely stenotic. Since orifice area methods do not …
Myoelectric Signal Recognition Using Artificial Neural Networks In Real Time, Adrian Del Boca
Myoelectric Signal Recognition Using Artificial Neural Networks In Real Time, Adrian Del Boca
FIU Electronic Theses and Dissertations
Application of EMG-controlled functional neuromuscular stimulation to a denervated muscle depends largely on the successful discrimination of the EMG signal by which the subject desires to execute control over the impeded movement. This can be achieved by an adaptive and flexible interface regardless of electrodes location, strength of remaining muscle activity or even personal conditions. Adaptability is a natural and important characteristic of artificial neural networks. This research work is restricted to the development of a real-time application of artificial neural network to the EMG signature recognition. Through this new approach, EMG features extracted by Fourier analysis are presented to …
Numerical Analysis Of The Pullout Problem Of A Fiber Embedded In A Matrix : Comparison With An Approximate Analytical Solution, Ivan Enrique Esparragoza
Numerical Analysis Of The Pullout Problem Of A Fiber Embedded In A Matrix : Comparison With An Approximate Analytical Solution, Ivan Enrique Esparragoza
FIU Electronic Theses and Dissertations
The classical problem of pullout of a long elastic rectilinear round bar (fiber) embedded in an elastic half-space (matrix) is considered before and while local debonding occurs. An approximate analytical solution derived from the elasticity theory, the intuitive Saint Venant's principle, the idea of boundary layer in hydrodynamics, and invariant Γ-integrals is presented. The problem is analyzed numerically by means of the finite element method using the ANSYS program. The cases of loading before and after the initiation of the debonding are studied. Both approaches, analytical and numerical, are compared in order to establish the concidence between them. The discrepancy …
Fault Tolerant And Integrated Token Ring Network, Thomas Christopher Gilbar
Fault Tolerant And Integrated Token Ring Network, Thomas Christopher Gilbar
FIU Electronic Theses and Dissertations
This thesis is a study of communication protocols (token ring, FDDI, and ISDN), microcontrollers (68HC 1EVB), and fault tolerance schemes. One of the major weaknesses of the token ring network is that if a single station fails, the entire system fails. A scheme involving a combination of hardware and timer interrupts in the software has been designed and implemented which deals with this risk. Software and protocols have been designed and applied to the network to reduce the chance of bit faults in communications. ISDN frame format proved to be exceptional in its capacity to carry echoed data and a …