Bibliographic record
Abstract
ABSTRACT The passage of a vehicle over a Modular Expansion Joint (MEJ) is known to generate noise. On August 23-26, 2009, emissions from two MEJ’s were investigated in the Province of British Columbia, Canada. MEJ emissions were monitored at wayside with the passage of general traffic, for a range of longitudinal offset positions. MEJ widths were 1.2 and 2.6 m. Variations in the character of tire/joint interaction noise were subjectively observed for several vehicle classes, weights, speeds, tire widths and tire types. For general traffic with an average speed of 100 kph, it was found that the dominant MEJ emission frequency was centered at the 630 Hz one-third octave band in 73% of cases. On March 3-4, 2010, three vehicles were used to conduct controlled tests and the relationship between the character of MEJ emissions and speed was explored for speeds of 90 to 100 kph. It was found that the dominant frequency was 630 Hz in 69% of the trials independent of speed. For the heaviest vehicles, MEJ emission levels were up to 8.7 dB higher. MEJ emissions were found to exhibit a directional variation of L max 8.6 dBA at a range of 100 m. Keywords: Modular Expansion Joint, Tire, Joint, Noise, Emission, Monitoring, Controlled Vehicle Test, Using Instrumentation in Innovative Ways
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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) | 0.000 | 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".