Floor excitation with the heavy soft impact source
Bibliographic record
Abstract
Low frequency impact sound is one of the most common reasons for complaints by buildingoccupants. Therefore, some countries, Japan and Korea, have introduced heavy soft impactsources into their standards ? the ?tire? and the ?rubber ball? - that effectively excite lowfrequency sound. Both are dropped from a specified height on the floor under test. Although theball was introduced more recently, it seems to be more accepted by engineers in the field becauseof the ease of handling. In previous studies, to better understand the floor excitation by the ball, asimple analytical model that does not account for modal ball deflection was applied to predict itsblocked force. Good agreement between prediction and measurement was found in the lowfrequency range, however, the analytical model grossly underestimated the blocked force in themid and high frequency range. In this paper the finite element method is applied to predict themodal deformation of the ball during impact on the floor. The results of this numerical study helpsto better understand discrepancies found in earlier publications between the analytic ball modeland measurement. Conclusions for the improvement of the analytical model are finally drawn.
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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 | 0.000 |
| 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) | 0.002 | 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".