A Vibration-Based Strategy for Health Monitoring of Offshore Pipelines’ Girth-Welds

A Vibration-Based Strategy for Health Monitoring of Offshore Pipelines' Girth-Welds

This study presents numerical simulations and experimental verification of a vibration-based damage detection technique. Health monitoring of a submerged pipe's girth-weld against an advancing notch is attempted. Piezoelectric transducers are bonded on the pipe for sensing or actuation purposes. Vibration of the pipe is excited by two means: (i) an impulsive force; (ii) using one of the piezoel...

Remote Health Monitoring for Offshore Machines, using Fully Automated Vibration Monitoring and Diagnostics

This paper describes the use of vibration analysis with a fully automated diagnostics system to detect common machine faults such as imbalance and misalignment as well as bearing and gearbox faults of offshore machines. Other faults types, e.g. when a large object hits the propeller blades may be detected using the STFT. As the mechanical properties of the structure can change because of change...

INVESTIGATING THE EFFECT OF CRACK GEOMETRIES AND WELD MISMATCHING IN ORDER TO OPTIMIZE ECA ANALYSIS OF GIRTH WELDED OFFSHORE PIPELINES

Offshore pipelines are an effective tool for transportation of oil and gas which are usually assembled by the use of girth welds. Since flaws may naturally exist at such welds, fracture assessment of girth welded offshore pipelines is substantial. Current fracture assessment procedures like BS 7910 consider identical material properties for the weld and the base metals. However the strength dif...

Vibration Health Monitoring of Gears

the effectiveness of strategy-based instruction in teaching english as a second or foreign language: a meta-analysis of experimental studies

a large number of single research studies on the effects of strategy-based instruction (sbi) in teaching english as a foreign or second language has been conducted so far. however, the lack of a comprehensive meta-analysis targeting the effectiveness of english language sbi is observed. moreover, the findings of experimental studies regarding the context of the english language, proficiency lev...