Studying the effect of cracks on the ultrasonic wave propagation in a two dimensional gearbox finite element model

Didem Ozevin; Hossein Fazel; Justin Cox; William Hardman; Seth S. Kessler; Alan Timmons

doi:10.1117/12.2048519

10 April 2014 Studying the effect of cracks on the ultrasonic wave propagation in a two dimensional gearbox finite element model

Didem Ozevin, Hossein Fazel, Justin Cox, William Hardman, Seth S. Kessler, Alan Timmons

Author Affiliations +

Proceedings Volume 9063, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2014; 906303 (2014) https://doi.org/10.1117/12.2048519
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2014, San Diego, California, United States

Abstract

Gearbox components of aerospace structures are typically made of brittle materials with high fracture toughness, but susceptible to fatigue failure due to continuous cyclic loading. Structural Health Monitoring (SHM) methods are used to monitor the crack growth in gearbox components. Damage detection methodologies developed in laboratory-scale experiments may not represent the actual gearbox structural configuration, and are usually not applicable to real application as the vibration and wave properties depend on the material, structural layers and thicknesses. Also, the sensor types and locations are key factors for frequency content of ultrasonic waves, which are essential features for pattern recognition algorithm development in noisy environments. Therefore, a deterministic damage detection methodology that considers all the variables influencing the waveform signature should be considered in the preliminary computation before any experimental test matrix. In order to achieve this goal, we developed two dimensional finite element models of a gearbox cross section from front view and shaft section. The cross section model consists of steel revolving teeth, a thin layer of oil, and retention plate. An ultrasonic wave up to 1 MHz frequency is generated, and waveform histories along the gearbox are recorded. The received waveforms under pristine and cracked conditions are compared in order to analyze the crack influence on the wave propagation in gearbox, which can be utilized by both active and passive SHM methods.

Citation Download Citation

Didem Ozevin, Hossein Fazel, Justin Cox, William Hardman, Seth S. Kessler, and Alan Timmons "Studying the effect of cracks on the ultrasonic wave propagation in a two dimensional gearbox finite element model", Proc. SPIE 9063, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2014, 906303 (10 April 2014); https://doi.org/10.1117/12.2048519

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KEYWORDS

Teeth

Wave propagation

Structural health monitoring

Ultrasonics

Damage detection

Finite element methods

Sensors

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