As computer systems continue to grow rapidly in both complexity and scale, developers need tools to help them understand the behavior and performance of these systems. While information visualization is a promising technique, most existing computer systems visualizations have focused on very specific problems and data sources, limiting their applicability. This dissertation introduces Rivet, a ...

Aging aircraft may develop multiple-site damage (MSD) that can reduce the structural integrity of fuselage structures. The existence of small cracks emanating from adjacent rivet holes in a fuselage lap-splice joint is of major concern. Small collinear cracks greatly reduce the residual strength of a panel with a lead crack. Recent studies predicting the residual strength of flat and curvilinea...

A three-dimensional finite element modeling is developed using ABAQUS software. This includes riveted and rivet-bonded joints models. Both models undergo thermal heat caused by hot-driven rivet process and then are subjected to a constant velocity at one of its strip edges to simulate the shear tensile test up to the failure point. The developed FE models were based on elastic-plastic propertie...

The subject of this paper is the maximum legal firing sequence problem (MAX-INLFS) for inhibitor-arc Petri nets IN. It is well-known that modeling capability of inhibitor-arc Petri nets is equivalent to that of Turing machines, and MAXINLFS has wide applications to fundamental problems of Petri net such as the marking reachability problem, the scheduling problem, and so on. It is known that, wh...

Magneto-optic Imaging (MOI) is a non-destructive evaluation technique that is being used increasingly in aircraft inspection. In order to address the problem of interpreting a large volume of inspection data and subjectivity of manual interpretation, this paper presents an automated rivet inspection algorithm that performs filtering, rivet detection, and classification using MOI. The algorithms...

the metal sheets play an important role in the mechanical design, particularly in the aerospace structures. the rivet connections are frequently used to connect these sheets. the riveting quality greatly influences the rupture of the rivet and the sheet. the various parameters affect the quality of this operation. in this paper, the optimization of the parameters contributing to the riveting qu...

Multi site damage is one of the important aspects to be studied to ensure the safety of the aircraft structure. The rivet hole locations are one of the stress concentration regions. The current study includes a panel which represents the fuselage splice joint. The fuselage splice joint is a location where it experiences the uniform stress field at many rivet locations in a row. This study has r...

In this article, ultrasonic guided wave propagation and interaction with the rivet hole cracks has been formulated using closed-form analytical solution while the local damage interaction, scattering, and mode conversion have been obtained from finite element analysis. The rivet hole cracks (damage) in the plate structure gives rise to the non-axisymmetric scattering of Lamb wave, as well as sh...

Biceps tenodesis maintains the cosmetic appearance and length-tension relationship of the biceps with an associated predictable clinical outcome compared with tenotomy. Arthroscopic suprapectoral techniques are being developed to avoid the disadvantages of the open subpectoral approach. This study biomechanically compared 3 arthroscopic suprapectoral biceps tenodesis techniques performed with a...