Quantify Resonance Inspection with Finite Element-Based Modal Analyses
Resonance inspection uses the natural acoustic resonances of a part to identify anomalous parts. Modern instrumentation can measure the many resonant frequencies rapidly and accurately. Sophisticated sorting algorithms trained on sets of good and anomalous parts can rapidly and reliably inspect and sort parts. This paper aims at using finite-element-based modal analysis to put resonance inspection on a more quantitative basis. A production-level automotive steering knuckle is used as the example part for our study. First, the resonance frequency spectra for the knuckle are measured with two different experimental techniques. Next, scanning laser vibrometry is used to determine the mode shape corresponding to each resonance. The material properties including anisotropy are next measured to high accuracy using resonance spectroscopy on cuboids cut from the part. Then, finite element model (FEM) of the knuckle is generated by meshing the actual part geometry obtained with computed tomography (CT). The resonance frequencies and mode shapes are next predicted with a natural frequency extraction analysis after extensive mesh size sensitivity study. The good comparison between the predicted and the experimentally measured resonance spectra indicate that finite-element-based modal analyses have the potential to be a powerful tool in shortening the training process and improving the accuracy of the resonance inspection process for a complex, production level part. The finite element based analysis can also provide a means to computationally test the sensitivity of the frequencies to various possible defects such as porosity or oxide inclusions especially in the high stress regions that the part will experience in service.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1015283
- Report Number(s):
- PNNL-SA-74354; VT0505000; TRN: US201111%%529
- Resource Relation:
- Conference: Proceedings of the ASME International Mechanical Engineering Congress & Exposition, November 12-18, 2010, Vancouver, British Columbia, Paper No. IMECE2010-39497
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACCURACY
ACOUSTICS
ALGORITHMS
ANISOTROPY
COMPUTERIZED TOMOGRAPHY
DEFECTS
GEOMETRY
LASERS
MECHANICAL ENGINEERING
OXIDES
POROSITY
PRODUCTION
RESONANCE
SENSITIVITY
SHAPE
SORTING
SPECTRA
SPECTROSCOPY
TRAINING
Resonance Inspection
Acoustics
Finite Element Modal Analysis