Covert-feathers-inspired passive flow control is beneficial for aerodynamic performance at post-stall angles of attack. However, most studies model covert feathers as a rigidly attached or freely moving flap on wing. The mounted via torsional spring, emblematic to the finite stiffness bird feathers, has remained unexplored. We simulate strongly coupled fluid-structure interactions past stationa...

Article history: Received: 06.02.2015. Received in revised form: 11.05.2015. Accepted: 15.05.2015. Due to the shortcomings of one mass vibration mill such as inefficiency, high energy consumption and big noise, a double mass high energy vibration mill, in which transient high vibration intensity is produced, is investigated by applying the non linear vibration theory. The nonlinear hard feature...

In this paper, static indentation and low velocity impact responses of a fully backed composite sandwich plate subjected to a rigid flat-ended cylindrical indenter/impactor are analytically investigated. The analysis is nonlinear due to nonlinear strain-displacement relation. In contrast to the existed analytical models for the indentation of composite sandwich plates, the stacking sequence of ...

The increasing use of renewable energy sources to combat climate change comes with the challenge power imbalance and instability issues in emerging grids. To mitigate fluctuation arising from intermittent nature renewables, electric spring (ES) has been proposed as a fast demand-side management technology. Since its original conceptualization 2011, many versions variants ESs have emerged indust...

We have set about the goal of developing a bungee jump system that will provide an ideal experience for a falling egg by maximizing the passenger’s free fall time, minimizing the force it experiences during deceleration, and not allowing the passenger to hit the ground. In order to develop an ideal bungee system, we must first determine the properties of our bungee cord. Under the assumption th...