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Prior to 9/11, the intelligence process and tools used by our government were primarily directed at known threats with well understood functions and activities. However, with the rising importance of non-state actors and asymmetric threats, threat-focused processes and tools are now directed at known threats whose functions and activities are not well understood [1]. Today's intelligence environment...
In this paper, a new function of variable stiffness & damping device (VSDD) brace control systems is explored: facilitating structural parameter estimation and damage detection. In previous studies by the authors, a substructure identification method has been proposed to identify the structural parameters (story stiffness and damping coefficients) of a shear building. An error analysis shows that...
Recent developments of a distributed mass damper (DMD) system integrate structural and environmental control systems for buildings. External shading fins are used as mass dampers such that they can (i) control building energy consumption by adjusting the fins and, thus, the amount of sunlight coming into the building and (ii) control structural movements by dissipating energy with the dampers during...
A multiscale algorithm is developed in this study in which the ideal MHD equations is coupled with a two-fluid or a fully kinetic model to correctly model magnetic reconnection that is a common phenomena in the magnetosphere and in laboratory plasmas. In this approach, special Riemann solvers are constructed in such a way as to minimize spurious reflections at the model interface. The proposed method...
A state estimation algorithm for rejecting noise and tracking bias in both real-time and post-processing applications of inertial measurement for intermittent motion is presented with experimental results for one-dimensional motion. The algorithm uses characteristics of the sensor noise to automatically recognize motionless periods and update the sensor's bias level without any dependency on application-specific...
Structural health monitoring (SHM) is a well-established multi-disciplinary research field, in which the goal is to develop technologies and techniques to automatically detect, localize, and classify damage in large structures. This paper is focused, starting with a simple SHM problem and a simple structure, on how wireless sensor networking technologies can help advance SHM. Specifically, a distributed...
Structural health monitoring (SHM) is the process of monitoring structural health and identifying damage existence, severity and location. Clear needs for SHM exist for various types of civil structures; for example, approximately 25% of U.S. bridges are rated as deficient and require significant expenditures to rebuild or replace them (FHWA, 2002). However, the dominant method for monitoring the...
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