Model updating can be considered as a branch of optimization problems in which calibration of the finite element (FE) model is undertaken by comparing the modal properties of the actual structure with these of the FE predictions. The attainment of a global solution in a multi dimensional search space is a challenging problem. The nature-inspired algorithms have gained increasing attention in th...

A spatially dense wireless sensor network was designed, developed and installed on a long-span suspension bridge for a 3-month deployment to record ambient acceleration. A total 174 sets of data 1.3 GB were collected from 64 sensor nodes on the main span and south tower of the Golden Gate Bridge. Analysis of the vibration data using power spectral densities and peak picking provide approximate ...

Scheduling in piconets has emerged as a challenging research area. Interpiconet scheduling focuses on when a bridge is switched among various piconets and how a bridge node communicates with the masters in different piconets. This paper proposes an interpiconet scheduling algorithm named, hold mode based dynamic traffic priority load adaptive scheduling. The bridges are adaptively switched betw...

Vibration monitoring from strain data is a promising alternative to the more conventional acceleration-based because dense measurement grid can be achieved at relatively low cost and mode shapes are sensitive local stiffness changes than displacement shapes. However, feasibility of full-scale civil structures, where operational dynamic levels very amplitude temperature influence modal character...

We introduce a nondedicated bridge health monitoring (BHM) system that turns pre-existing telecommunication fiber-optic cables into distributed acoustic sensors to collect dynamic strain responses. Due extensively installed fiber in the cities, our cable-based enables efficient and low-cost BHM without requirement of on-site sensor installation maintenance; however, it is challenging extract da...

Several years ago, in the context of physics hysteresis magnetic materials, a simple stochastic model has been introduced: ABBM model. Later, advocated as paradigm for broad class diverse phenomena, baptised "crackling noise phenomena". The reproduces many statistical features such intermittent signals, statistics burst (or avalanche) durations and sizes, with their power law exponents that wou...

The nonlinear characteristics of a general multiple degree-of-freedom suspension bridge under harmonic excitation are studied with an innovative approach consisting the modes, finite element modeling and incremental balance method. geometric nonlinearity induced by large-amplitude vibration is considered. mode mean kinetic energy system proposed to describe responses. can be expressed as linear...

This paper presents a comparison of the statistics on the measured modal parameters of a bridge structure to the expected changes in those parameters caused by damage. It is then determined if the changes resulting from damage are statistically significant. This paper considers the most commonly used modal parameters for indication of damage: modal frequency, mode shape, and mode shape curvatur...

The mode shapes of piezoelectric metamaterials are tuned by manipulating spatially the electrical boundary conditions piezo-elements, in a desired and controlled manner, order to tailor wave propagation characteristics through these metamaterials. piezo-elements using inductive shunting networks. With appropriate tuning optimization spatial distribution conditions, it would be possible alter sh...

To prevent lifetime shortening and premature failure in turbine runners, it is of paramount importance to analyse understand its dynamic response determine the factors that affect it. In this paper, a Kaplan runner analysed air by numerical experimental methods. First, start analysis mode shapes, geometry simplified modelled as bladed disk. Bladed disks with different blade numbers are investig...