Measuring transverse motion of vibration shakers
Bibliographic record
Abstract
Accelerometers are designed to measure vibration in one precisely defined principal axis, usually perpendicular to the mounting surface. Ideally, there should be no response to accelerations in the other directions. In practice, the accelerometer does produce a charge or voltage when it is vibrated in the axis at 90° to the principal axis of measurement. The resulting output is indistinguishable from the response to the acceleration in the principal axis. This leads to an increased measurement uncertainty if these transverse accelerations exist during the calibration of the accelerometer. For this reason, the international standard ISO 16063-11 specifies limits for the transverse motion of vibration shakers. This paper presents the development of a laser interferometric system, which is designed to measure the transverse motion of an air-bearing calibration-grade shaker for various loads. The use of a mounting fixture with integrated plane mirror reflectors allows the transverse motion to be measured during the calibration itself. The system is capable of simultaneously measuring transverse motions along two axes. The measured transverse motion of a low-frequency accelerometer mounted on a long-stroke shaker is presented for frequencies in the range from 2 Hz to 40 Hz.
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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".