In this study, the structural performance of the gravity-type caisson structure is assessed from vibration-based system identification. To achieve the objective, the following approaches are implemented. Firstly, a structural identification algorithm based on the use of vibration characteristics is outlined. Structural stiffness and damping are selected as two key parameters to be identified fo...

In this paper, a novel nonlinear robust damping controller is proposed to suppress power oscillation in interconnected power systems. The proposed power oscillation damping controller exhibits good nonlinearity and robustness. It can consider the strong nonlinearity of power oscillation and uncertainty of its model. First, through differential homeomorphic mapping, a mathematical model of the s...

The dynamic response of frame-type structures with hysteretic damping at the structural joints, resulting from slipping and nonlinear flexible connections, is investigated in this paper. The slipping at a structural joint is represented by the modified Coulomb joint model. The behavior of a nonlinear flexible connection is modeled by the Ramberg-Osgood function. A simple computational model for...

Seismic protective devices in the form of isolation and supplemental damping devices can be effective means in mitigating the seismic responses of structures. The required stiffness and damping values to achieve optimal performance depend on the characteristics of structures and ground motions. Instead of using actively controlled devices, one can select the passive devices to roughly mimic the...

This paper will describe how experimental modal testing can be used for designing and determining the effectiveness of add-on damping systems for small structures or substructures. These add-on damping systems, also known as surface damping treatments. have been in use for over 30 years as a means of reducing the response of a structure subjected to vibratory loads. By adding damping to the str...

A simple and practical multiscale approach suitable for topology optimization of structural damping in a component ready for additive manufacturing is presented. The approach consists of two steps: First, the homogenized loss factor of a two-phase material is maximized. This is done in order to obtain a range of isotropic microstructures that have a connected stiff material phase. Second, the s...

We present results for stiffness and damping prediction in a class of layered, wavy, metal–polymer composites that exceed conventionally published stiffness-damping maps (The Wang–Lakes line, see [14]). These composites are realized by judiciously placing selected, wavy, metal sheets that sandwich an ultra-thin layer of polymer. Stacks of alternating metal–polymer layered composites, when compr...

improving employment opportunities for people and reducing the economic burden on government requires a broad and concentrated effort on private sectors.  private sector growth is a key engine for creation jobs. the major advantage of private sector is its employment potential at low capital cost. these sectors are the nursery of entrepreurship, often driven by individual creativity and innovat...