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Full-Text Articles in Engineering
Direct Stochastic Equivalent Linearization Of Sdof Smart Mechanical System, L. Duval, Mohammad N. Noori, S. Seelecke
Direct Stochastic Equivalent Linearization Of Sdof Smart Mechanical System, L. Duval, Mohammad N. Noori, S. Seelecke
Office of the Dean (CENG) Scholarship
The first and second moments of response variables for SDOF system with pseudoelastic material are obtained by a direct linearization procedure. This procedure is an adaptation of well-known statistical linearization methods, and provides concise, model-independent linearization coefficients. The method can be applied to systems that incorporate any SMA hysteresis model having a differential constitutive equation, and can be used for zero and non-zero mean random vibration. This implementation eliminates the effort of deriving linearization coefficients for new SMA hysteresis model. In this paper the complete statistical response of SDOF system containing a mass and a bar made of SMA is …
Wavelet-Based Approach For Structural Damage Detection, Z. Hou, Mohammad N. Noori, R. St. Amand
Wavelet-Based Approach For Structural Damage Detection, Z. Hou, Mohammad N. Noori, R. St. Amand
Office of the Dean (CENG) Scholarship
A wavelet-based approach is proposed for structural damage detection and health monitoring. Characteristics of representative vibration signals under the wavelet transformation are examined. The methodology is then applied to simulation data generated from a simple structural model subjected to a harmonic excitation. The model consists of multiple breakable springs, some of which may suffer irreversible damage when the response exceeds a threshold value or the number of cycles of motion is accumulated beyond their fatigue life. In cases of either abrupt or accumulative damages, occurrence of damage and the moment when it occurs can be clearly determined in the details …
Operator Split Technique Applied To Random Vibration Of Smart Sdof Mechanical Systems, L. Duval, Mohammad N. Noori, M. A. Savi
Operator Split Technique Applied To Random Vibration Of Smart Sdof Mechanical Systems, L. Duval, Mohammad N. Noori, M. A. Savi
Office of the Dean (CENG) Scholarship
A significant amount of research in the last few years has greatly advanced the field of structural control through the use of smart materials. Smart materials have the ability to change shape, stiffness, natural frequency, damping and other mechanical characteristics in response to environmental condition changes. One of he new class of materials with promising applications in structural and mechanical systems are Shape Memory Alloys (SMAs). However, there are few studies where the random response of mechanical systems containing shape memory components has been conducted. Such study is important to verify the feasibility on the use of SMAs in structural …
Random Vibration Studies Of An Sdof System With Shape Memory Restoring Force, L. Duval, Mohammad N. Noori, Z. Hou, H. Davoodi, S. Seelecke
Random Vibration Studies Of An Sdof System With Shape Memory Restoring Force, L. Duval, Mohammad N. Noori, Z. Hou, H. Davoodi, S. Seelecke
Office of the Dean (CENG) Scholarship
Intelligent and adaptive material systems and structures have become very important in engineering applications. The basic characteristic of these systems is the ability to adapt to the environmental conditions. A new class of materials with promising applications in structural and mechanical systems is shape memory alloy (SMA). The mechanical behavior of shape memory alloys in particular shows a strong dependence on temperature. This property provides opportunities for the utilization of SMAs in actuators or energy dissipation devices. However, the behavior of systems containing shape memory components under random excitation has not yet been addressed in the literature. Such a study …