Investigation of flanking sound transmission in lightweight building structures using a scanning laser vibrometer
Bibliographic record
Abstract
In some cases the overall sound transmission between adjacent dwellings is governed by flanking transmission and hence testing of the flanking performance of building structures is an important issue. Usually the well established indirect measurement method of ISO 10848 is applied for testing junctions of lightweight building elements like wood joist floors and gypsum board walls. Here a full-scale junction is built in a special test facility, some surfaces of the test specimen are shielded, and the sound pressure level difference between the source and receive rooms is measured. An estimate of the flanking sound reduction index of one particular path is obtained by considering the power injection, propagation attenuation of structural waves in the two coupled elements, junction attenuation, and radiation into the receiving room. In this paper a scanning laser vibrometer is used to get a better understanding of flanking transmission in lightweight building structures and of the above-mentioned mechanisms. The spatial distribution of the velocity on the surface of the structure is measured and structural power flow is investigated.
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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 | 0.000 | 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 | 0.000 |
| 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".