Experimental and numerical comparison of acoustic performance of sound packages with viscoelastic damping or equivalent mass as treatments to flat aluminum panel.
Bibliographic record
Abstract
Acoustic performance parameters of airborne and structure-borne insertion loss were compared experimentally and numerically for sound packages with viscoelastic damping or equivalent mass. Transfer matrix method and finite element method were used to perform the numerical analysis. Viscoelastic material damping and equivalent mass (as part of sound packages) were compared as treatments to an aluminum flat panel. The sound packages were made up of either fiberglass or foam in addition to viscoelastic material damping or equivalent mass. The viscoelastic material damping used in this study is constraining layer damping (CLD). The equivalent mass was a solid material with the same surface weight of CLD. As part of the analysis, aluminum panel with and without sound package was subjected to diffuse acoustic field and point force mechanical excitations. The experimental and numerical results both show the same trends. [Work supported by MTI Polyfab Inc.]
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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 | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".