Simulation and the monte carlo method

Nonlinear Oscillations: Exact Solutions and their Approximations

High-Performance Piezoelectric Energy Harvesters and Their Applications

The last two decades have witnessed several advances in microfabrication technologies and electronics, leading to the development of small, low-power devices for wireless sensing, data transmission, actuation, and medical implants. Unfortunately, the actual implementation of such devices in their respective environment has been hindered by the lack of scalable energy sources that are necessary to power and maintain them. Batteries, which remain the most commonly used power sources, have not kept pace with the demands of these devices, especially in terms of energy density. In light of this challenge, the concept of vibratory energy harvesting has flourished in recent years as a possible alternative to provide a continuous power supply. While linear vibratory energy harvesters have received the majority of the literature’s attention, a significant body of the current research activity is focused on the concept of purposeful inclusion of nonlinearities for broadband transduction. When compared to their linear resonant counterparts, nonlinear energy harvesters have a wider steady-state frequency bandwidth, leading to a common belief that they can be utilized to improve performance in ambient environments. Through a review of the open literature, this paper highlights the role of nonlinearities in the transduction of energy harvesters under different types of excitations and investigates the conditions, in terms of excitation nature and potential shape, under which such nonlinearities can be beneficial for energy harvesting. [DOI: 10.1115/1.4026278]

On the Role of Nonlinearities in Vibratory Energy Harvesting: A Critical Review and Discussion

Thank you for reading stochastic processes and filtering theory. Maybe you have knowledge that, people have look numerous times for their favorite novels like this stochastic processes and filtering theory, but end up in harmful downloads. Rather than reading a good book with a cup of tea in the afternoon, instead they are facing with some infectious bugs inside their computer. stochastic processes and filtering theory is available in our digital library an online access to it is set as public so you can download it instantly. Our digital library saves in multiple locations, allowing you to get the most less latency time to download any of our books like this one. Merely said, the stochastic processes and filtering theory is universally compatible with any devices to read.

Stochastic Processes And Filtering Theory

Transient combined radiative and conductive heat transfer is very crucial for glass thermoforming industry. Real time control of the process is presently under consideration for better glass manufacture with less defects. Solution of transient combined radiative and conductive heat transfer in glass requires the solution of radiative transfer equation, which usually takes hours to converge using latest finite volume codes. This paper formulates a polynomial approximation of the radiative part for real time applications. A state space model of the transient conductive and radiative heat transfer is presented. All the states of the model is shown to be observable with measurement only at one surface. The method is faster and takes few seconds to reach steady state with little deviation from the finite element solution. Formulation of the discretization is shown for one dimensional gray medium. Numerical simulation is presented for a case close to glass thermoforming with different radiative sources. A comparison with finite element solutions is also presented and it demonstrates the efficiency of this numerical tool.

An approximate modeling of 1d transient heat transfer in a gray participating medium

In this manuscript, a concept flow control valve is designed, exploiting the bistable characteristics of a special class of hybrid laminates made of glass epoxy and carbon epoxy prepregs. The principal structural element of the device is a hybrid bistable laminate, having a multi-section layup laid in a symmetric configuration. The thermal curing process responsible for the inherent bistability is simulated in ABAQUS\(^{\textregistered }\) and the equilibrium shapes hence obtained using the FEA scheme is validated against an existing semi-analytical technique based on the Rayleigh-Ritz minimization of potential functional. These multi-stable elements are then studied for their potential in controlling a flowing stream. Toward that, the snapping response of these laminates in a flow stream is analyzed using a combination of XFOIL and ABAQUS\(^{\textregistered }\). The pressure distribution on the laminate is estimated using XFOIL, which is an interactive program for analysis of subsonic isolated airfoils in viscous/inviscid low Reynolds number flow. The pressure distribution hence obtained is used to evaluate the load-displacement characteristics of the laminate using post-buckling regime analysis capabilities of ABAQUS\(^{\textregistered }\). Using these analysis tools, the design space is explored and the possibility of using the proposed bistable design elements for flow regulation is established.

Design of a Flow Control Device Using a Special Class of Hybrid Symmetric Bistable Laminates in Clamped Boundary Condition

Semiactive control using MR dampers begins with a model development that can describe the dampers' hysteretic characters properly and control algorithms that consider the nonlinear damper voltage to force map. This book develops an efficient MR damper model from experiments. Further an intelligent optimal fuzzy logic control, a nonlinear integral backstepping and a dynamic inversion control algorithms are developed in connection to MR dampers. Experiments and benchmark applications are presented for the control algorithms. The book is with recent research as goal. It can be used as a reference for structural control courses. The applications shown here are benchmark and practical. Which make this book very useful to industry and academia. Moreover, Chapter 2 forms the backbone of this book, providing a broad literature review on structural control and will be useful to every reader. Every chapter has an introduction which covers a wide range of literature specific to that chapter. New nonlinear control algorithms viz. integral backstopping and dynamic inversion are developed and various applications are shown which will benefit many researchers in structural control.

Semi-Active Structural Control Using MR Dampers

SEREP Integrated Control of Flexible Structures

Multiple energy harvesters in a single device has become important to harvest enough power at wider frequencies for sensors. In such situation presence of magnetic force and mechanical coupling may change the performance of the overall system. This paper, studies a simple case of two pendulums in a same frame coupled magnetically and mechanically for electromagnetic broadband energy harvesting under low frequency excitation. The effect of mechanical coupling, frequency and distance between harvesters on bandwidth and magnitude of power are analyzed. The numerical analysis shows that the mechanical coupling with magnetic coupling increases the power magnitude and band width.

Shaikh Faruque Ali

Papers

An approximate modeling of 1d transient heat transfer in a gray participating medium

Design of a Flow Control Device Using a Special Class of Hybrid Symmetric Bistable Laminates in Clamped Boundary Condition

Semi-Active Structural Control Using MR Dampers

SEREP Integrated Control of Flexible Structures

Magneto-mechanically coupled energy harvesters