Wireless sensing technology has made it possible to instrument large civil structures, such as bridges, with dense networks of wireless sensors. Because many wireless sensing platforms integrate data processing capabilities with high-precision analog-to-digital converters, it is possible to autonomously process sensor data without the need for a central data server. By employing parallel proces...

structural dynamic parameters: natural period, shape modes and damping ratio of vibration, play a decisive role on the seismic behavior of those structures. there are several methods for determining of the structural dynamic parameters, such as: free vibration, ambient vibration and force vibration tests. in this research the structural response of a three-story building (the natural frequencie...

A new self-powered magnetorheological (MR) damper control system was developed to mitigate cable vibration. The power source of the MR damper is directly harvested from vibration energy through a rotary permanent magnet direct current (DC) generator. The generator itself can also serve as an electromagnetic damper. The proposed smart passive system also incorporates a roller chain and sprocket,...

The damped outrigger system is in widespread use as a damping modification for tall buildings that provides high additional addition to the bending back effect against core. However, while enhanced seismic performance of systems was confirmed previous studies all over world, general-purpose optimal design method focusing on modal ratios has not been established yet. This paper proposes an dampe...

The present work addresses the experimental identification of amplitude-dependent modal parameters (modal frequency, damping ratio, Fourier coefficients periodic oscillation). Phase-resonant testing has emerged as an important method for this task, it substantially reduces amount data required compared to conventional frequency-response at different excitation/response levels. In case shaker-st...

This paper proposes a vibration model for modal analysis and control of vertical cable-dual tuned mass damper (C-DTMD) coupled system. The proposed introduces several non-dimensional parameters to describe the in-plane Moreover, phenomenon split is comprehensively studied present complex modes. Parameter conducted show influence length ratio, damping frequency ratio on reduction. In addition, t...

The latest generation of FFT Analyzers contain still more and better features for excitation, measurement and recording of frequency response functions (FRF's) from mechanical structures. As measurement quality continues to improve, a larger variety of curve fitting methods are being developed to handle a set of FRF measurements in a global fashion. These approaches can potentially yield more c...

Autonomous modal parameter estimations may involve sorting a large number of possible solutions to develop one consistent estimate of the modal parameters (frequency, damping, mode shape, and modal scaling). Once the final, consistent estimate of modal parameters is established, this estimate can be compared to related solutions from the larger set of solutions to develop statistical attributes...

Modal vectors frequently have small amounts of contamination or distortion from random errors or bias errors, particularly when compared to results from modeling where normal modal vectors are the common result since damping is not included in the model. In order to understand, and possibly eliminate the contamination, tools are needed to evaluate the contamination. While the traditional modal ...

Operational modal analysis deals with the estimation of modal parameters using vibration data obtained from unknown or ambient excitation sources in operational rather than laboratory conditions. The paper compares three operational modal parameter identification approaches for identifying modal parameters of a multi-span concrete motorway bridge when subjected to either ambient or broad-band l...