Study on a four degrees-of-freedom multi-dimensional vibration isolation platform based on a 4-UPU parallel mechanism
Bibliographic record
Abstract
A novel four degrees-of-freedom (4-DOF) multi-dimensional vibration isolation platform (MDVIP) based on a four universal–prismatic–universal (4-UPU) parallel mechanism is put forward for vibration isolation of sensitive devices. It consists of four limbs, each of which has two universal joints and a spring damper module. The kinematic model and the vibration model of the proposed MDVIP were designed and analyzed. The main dimensions of the MDVIP and the parameters of the spring damper module were determined by an optimization method to meet various design requirements and constraints. Both the virtual prototype and physical prototype of the MDVIP were designed to verify vibration isolation performance. The results of numerical calculations, simulation, and experimental studies based on vibration response analysis show that the proposed MDVIP can isolate at least 78% of the vibration from the fixed base in three axial directions and 64% of the vibration in the direction around the Z-axis. It can therefore largely attenuate disturbances to items on a moving platform.
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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 | 0.000 |
| 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 | 0.001 |
| Open science | 0.001 | 0.001 |
| 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".