Quantitative Detection of Rock Crack Width Using Microwave Resonance Vibration Eigenvalues

Quantitative Measurement of Crack Parameters Using Microwave Eddy-Current Techniques

The objectives of this work were to develop an electromagnetic scattering model that can be used to predict the microwave scattering from a crack in a metallic surface, and to evaluate the potential of using microwave scattering measurements to determine the dimensions of the crack. The .initial approach to this problem has been to model the surface crack as a section of rectangular waveguide s...

Crack Detection of Timoshenko Beams Using Vibration Behavior and Neural Network

Abstract: In this research, at first, the natural frequencies of a cracked beam are obtained analytically, then, location and depth of a crack in beam is identified by neural network method. The research is applied on a beam with an open crack for three different boundary conditions. For this purpose, at first, the natural frequencies of the cracked beam are obtained analytically, to get the ex...

Microwave and millimetre wave sensors for crack detection

Vibration and Crack Detection in Gas Turbine Engine Compressor Blades using Eddy Current Sensors

High cycle fatigue (HCF) cracks generated by compressor blade vibrations are a common source of failure in gas turbine engines. Current methods for crack detection are costly, time consuming, and prone to errors. In-situ blade vibration detection would help operators avoid critical engine speeds, and help infer the presence of cracks via a change in the mode of a blade. Blade vibrations can be ...

Rotor Crack Detection by Using Multi-vibration Signal from The Basement

Rotor crack detection method by using multi-vibration signals gathered at the basements is presented in this paper. The finite element software ANSYS is applied for analyzing the vibration response characteristics of the basement to determine sensor configuration. Feature fusion for time-domain statistics of multiple sensors is performed by using the support vector machine to diagnose the depth...