Comparison of methods for the estimation of Young’s moduli and structural loss factor of wood, applied to guitar soundboards made of Adirondack spruce
Why this work is in the frame
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Bibliographic record
Abstract
Standardised methods for characterising the mechanical properties of materials were mainly developed for metals or alloys with isotropic behaviour. They are consequently poorly suited to characterising materials that exhibit orthotropic and space-varying behaviour, such as polymers, composites, and natural materials like wood. The focus of this work is on guitar soundboards made of Adirondack spruce ( Picea rubens , also known as red spruce). Tests are conducted on 12 quarter-sawn plates. This work compares the practicality of methods to estimate the Young's modulus and the structural loss factor of these soundboards, while the variability of results for each method is outlined. A first interest of this work is to determine the trade-off between measurement methods and systems of variable cost and complexity. In addition, the viability of an asymptotic method is demonstrated for such structures (a technique based on mobility measurement and the assumption of an infinite structure). At the same time, the importance of considering the sensor mass is confirmed for low-density structures by comparison with measurements on aluminum and medium-density fibre board panels.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it