Keeping the eigenfrequencies of a structure away from the external excitation frequencies is one of the main goals in the design of vibrating structures in order to avoid risk of resonance. This paper is devoted to the topological design of freely vibrating continuum structures with the aim of maximizing the fundamental eigenfrequency. Since in the process of topology optimization some areas of...

in the present work, study of the vibration of a functionally graded (fg) cylindrical shell made up of stainless steel, zirconia, and nickel is presented. free vibration analysis is presented for fg cylindrical shells with simply supported-simply supported and clamped–clamped boundary condition based on temperature independent material properties. the equations of motion are derived by hamilton...

We hypothesise that all electroweak symmetry breaking terms such as fermion masses and the W and Z gauge boson masses arise radiatively from just one explicit symmetry breaking term in the Lagrangian. Our hypothesis is motivated by the lack of experimental support and the lack of predictivity of the standard symmetry breaking scenario. We construct a simple model which illustrates our ideas. We...

Among the many techniques for system-level power management, it is not currently possible to guarantee timing constraints and have a comprehensive system model at the same time. Specifically, dynamic power management (DPM) techniques can model systems consisting of multiple devices with multiple mode settings. However, if hard real-time constraints are required, then DPM techniques are usually ...

River power plants are important contributors to the over 19% of world electricity produced by hydro-electric plants. Built in the natural course of a river, they produce energy by manipulating the water discharge through their facilities. They therefore introduce fluctuations in the river’s natural water level and flow, which might conflict with various constraints imposed for environmental an...

The success-history based adaptive differential evolution (SHADE) algorithm is an efficient modified version of the (DE) algorithm, and it has been successfully applied to solve some real-world optimization problems. However, best our knowledge, rarely in field structural optimization. optimal design structures with frequency constraints well known as a highly nonlinear non-convex problem many ...