http://ieeexplore.ieee.org/iel5/5/31047/01444179.pdf

Fundamentals of acoustics

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The World Bank Group

There are two types of debris flows, known as Lahar and Jökulhlaup. The word Lahar is Indonesian in origin and has to do with flows that are related to volcanic activity. A variety of factors may trigger a lahar, including melting of glacial ice due to volcanic activity, intense rainfall on loose pyroclastic material, or the outbursting of a lake that was previously dammed by pyroclastic or glacial material.

What is debris flow

Train–track–bridge dynamic interaction is a fundamental concern in the field of railway engineering, which plays an extremely important role in the optimal design of railway bridges, especially in ...

https://www.tandfonline.com/doi/pdf/10.1080/00423114.2019.1605085

Train–track–bridge dynamic interaction: a state-of-the-art review

Value-added recycling of construction waste wood into noise and thermal insulating cement-bonded particleboards

Bridge-borne noise pollution caused by train-induced bridge vibration has attracted more and more attentions due to its low-frequency characteristic. In order to investigate the numerical simulation technique of bridge-borne noise and noise reduction methods, a simply supported prestressed concrete (PC) box-girder bridge is adopted for study. Based on train-track-bridge interaction theory, the dynamic response of the bridge under a moving high-speed train is calculated in time-domain and assumed as the sound source of bridge-borne noise. Then bridge-borne noise is estimated according to boundary element method (BEM) in frequency-domain. The time-frequency transform is conducted by fast Fourier transformation (FFT). The validity of the numerical simulation technique is verified through comparison with field measurement results. Furthermore, noise reduction methods are proposed and corresponding effects are discussed. Results show that the proposed numerical simulation method is feasible and accurate in assessing bridge-borne noise. The dominant frequencies of bridge vibration and bridge-borne noise range from 40 Hz to125 Hz and from 31.5 Hz to 100 Hz, respectively. The peak frequency of bridge-borne noise near the bottom plate is 63 Hz. Increasing the thickness of deck plate, adjusting the inclination of webs to 0°–12°, strengthening the boundary constraints and adding a longitudinal clapboard are very effective noise control measures.

Theoretical and experimental investigation on bridge-borne noise under moving high-speed train

A case study of interior low-frequency noise from box-shaped bridge girders induced by running trains: Its mechanism, prediction and countermeasures

Through-thickness welding residual stress and its effect on stress intensity factors for semi-elliptical surface cracks in a butt-welded steel plate

Simply supported pre-stressed concrete box-girder bridges are the most common bridge type found on high-speed railway and urban rail transit lines in China. A field experiment has been conducted on the Pixian Viaduct of the Chengdu–Dujiangyan Intercity Railway, where two kinds of simply supported pre-stressed concrete box-girder bridges with a standard span of 32 m are used, one single track and the other double track. Characteristics of the noise underneath the box-girder, far from the bridge, and near the bridge gap were measured and analyzed in the time and frequency domains during high-speed train passage, as was the vibration of the box-girder’s bottom plate. The variations of noise with distance and train speed at locations 1.5 and 9 m above ground level were measured and fitted using mathematical formulae. A simplified formula to predict near-field bridge-borne noise was proposed and verified. The peak bridge-borne noise frequency and its tonal characteristic at 50 and 63 Hz for the double-track an...

Yadong Li

Papers

Theoretical and experimental investigation on bridge-borne noise under moving high-speed train

A case study of interior low-frequency noise from box-shaped bridge girders induced by running trains: Its mechanism, prediction and countermeasures

Through-thickness welding residual stress and its effect on stress intensity factors for semi-elliptical surface cracks in a butt-welded steel plate

Experimental research on noise emanating from concrete box-girder bridges on intercity railway lines

Through-thickness distribution of residual stresses in Q345qD butt-welded steel plates