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Provides an abstract for each of the keynote presentations and a brief professional biography of each presenter. The complete presentations were not made available for publication as part of the conference proceedings.
We examine the potential use of origami structures, especially the Tachi-Miura Polyhedron (TMP) which is an origami bellows structure, as mechanical metamaterials. Focusing on the kinematics of its folding, we show that the TMP has unique characteristics, e.g., The Poisson's ratios change from positive to negative depending upon the crease pattern. In addition, we introduce a torsion spring to model...
We numerically and experimentally investigate the nonlinear wave dispersion in 3D woodpile periodic structures consisting of slender cylindrical rods. The slender rods have low frequency resonance modes that are coupled with the propagating wave. Depending on the coupling of local modes, the propagating waveform in woodpile can change significantly. Also, the wave dispersion in temporal and spatial...
We study nonlinear transmission of energy in a finite dissipative periodic structure, which is externally driven at one end with a harmonic force. We show that when the driving frequency is within the stop band of the periodic structure, there is a threshold for the driving amplitude, above which there is a sudden increase in the energy transmitted through the finite structure. This is a generic phenomenon...
Periodic woodpile structures composed of slender cylindrical rods, defined as woodpile mechanical metamaterials herein, show versatile wave dynamics due to local resonances of slender rods. We numerically and experimentally investigate such resonance effects on nonlinear wave propagation in the woodpile mechanical metamaterials under impact excitations. We report these woodpile architectures exhibit...
We report on the existence of discrete breathers in a model of a one-dimensional, locally-resonant granular met material composed of a linear lattice with nonlinear local resonators. Using numerical continuation, we compute a discrete breather solution that bifurcates from a small amplitude Eigen mode with frequency at the lower edge of the optical band. The displacement profile of this breather is...
Spatial resolution in imaging systems used for pipe inspection plays a crucial role. Catadioptric imaging systems, which normally consist of a perspective camera and a hyperbolic mirror provide a cost-effective solution. Also, they would be the imaging system of choice in confined spaces due to their size factor. In this paper we, (1) define the cylindrical spatial resolution for the pipe inspection...
Activities developed under hazardous conditions, such as mining, require an active investment from the industry to avoid serious injuries and even loss of lives. One of the safety measures taken to address this problem is to implement a video surveillance system able to track vehicles and workers to enforce safety protocols preventing dangerous events that could lead to accidents. In this paper, we...
In many specialties related to computer vision, such as video processing for object inspection, microscopy or video surveillance, a performance requirement arises, the choice of hardware architecture that sized well is crucial for experts in image processing. However, these experts are not always expert in hardware architecture and are not always able to estimate a priori the performance of their...
Template matching is an important image processing algorithm for object detection and tracking tasks especially because of its very high accuracy. Yet, one major disadvantage of this algorithm is its very high computational effort due to its high complexity which results in low update rates using conventional software-based systems. Additionally, these systems are often afflicted by latency and jitter...
A tomographic methodology for inspection of TSV (Through Silicon Via) process wafers is developed by utilizing an X-ray source. In conventional X-ray computed tomography (CT), the scanning axis of X-ray source and detector is approximately parallel to the long axis of the phantom and perpendicular to the plane of X-ray source. However, because TSV projection data are captured by angling the phantom...
A new calibration method of micro actuators used for N-bucket phase-shifting in phase measuring profilometry has been developed to overcome the errors introduced by nonlinear, irregular, or unknown phase-step increments of actuators. First an evaluation measure of fringe displacement error is proposed to detect and evaluate the phase-shifting of the interference fringe induced by stepwise movements...
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