Ultrasonic nondestructive evaluation of cylindrical components by resonance acoustic spectroscopy
Bibliographic record
Abstract
Potential applications of Resonance Acoustic Spectroscopy (RAS) for the purpose of Nondestructive Evaluation (NDE) of isotropic clad rods and transversely isotropic cylinders encased in a solid elastic medium are investigated in this thesis. Mathematical models are developed for: (1) scattering of an obliquely incident plane acoustic wave from a transversely isotropic cylinder encased in a solid isotropic matrix and (2) scattering of a normally incident plane acoustic wave from an immersed isotropic clad rod with imperfect adhesion between the core and cladding. In these mathematical models, the scattered pressure field is obtained using a normal-mode expansion method. Experimental measurements of the scattered pressure fields are carried out using the short-pulse Method of Isolation and Identification of Resonances (MIIR). The method is applied to: copper-clad aluminum rods made from explosive welding and fiber-reinforced composite rods embedded in a solid medium. The experimental results show good agreement with the results obtained from the mathematical models. It is concluded that RAS has potential applications for nondestructive evaluation of various cylindrical components.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".