Investigating flanking noise transmission in mass timber construction through laboratory measurements of isolated floor toppings
Bibliographic record
Abstract
Mass timber is quickly becoming a popular design choice for multifamily residential development, with recent changes to building code allowing high-rise mass timber and the push towards lower embodied carbon or net zero construction. Cross Laminated Timber floor panel layouts and structural grids often result in continuous panels spanning between units or require rigid connections between panels, thus flanking noise transmission between units is an especially important acoustical design consideration. Quantifying the flanking noise transmission performance of a junction in an acoustical assembly requires knowledge of the vibration attenuation characteristics of its elements. The vibration reduction index (Kij) measures the transmission loss of a junctions' flanking paths by quantifying the transmission of vibrational power through its structural elements. This study utilizes Canada's National Research Council's four-room flanking facility to measure the Kij of flanking paths through a CLT wall/floor junction with and without isolated floor toppings on a resilient interlayer. Apparent Sound Transmission Class (ASTC) is then calculated from the measured Kij. The analysis presented investigates flanking noise transmission of a floating floor on a Cross Laminated Timber Panel spanning between the four rooms, with additional research into the effect of adding bulkheads on the ceiling side of the junction.
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How this classification was reachedexpand
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 | 0.001 |
| 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) | 0.000 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".