Active Vibration Control of a Flexible Robotic Manipulator
Why this work is in the frame
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Bibliographic record
Abstract
A five-degree-of-freedom (5-DOF) robot manipulator for agricultural applications was developed by previous members of the robotic lab at University of Saskatchewan. The manipulator was designed to be installed on a mobile base vehicle for monitoring targeted crops in a farm field using sensors installed on its tip. The crop monitoring is called phenotyping. When the manipulator mobile base moves along the field, vibration is induced from the farm terrain to the base of manipulator. Thus, the sensors mounted at the end-effector (EE) of the manipulator may not record data accurately. To address this issue, vibration suppression of the manipulator is necessary. The objectives of this research were: 1. Evaluation of vibration experienced by the 5-DOF manipulator’s tip; and 2. Study active vibration control to remedy vibration experienced by the manipulator; also, some efforts were done for possible implementation of active vibration control on the manipulator in a laboratory setting. Free and forced vibration simulation studies were conducted to evaluate the amplitude of vibration transmitted to the EE from the base of the manipulator. To eliminate excitation coming from the manipulator’s base, an active vibration suppression method using a model-based controller was used. To obtain a mathematical model for the manipulator, finite element analysis was utilized using commercial software and was verified manually. This method was applied to three different cases: 1- a cantilever beam, 2- a two-link, two-joint manipulator (2L2JM), and 3- the 5-DOF manipulator. For active vibration control, model reduction was applied to a state-space model of systems via a matched-DC algorithm. The LQR (linear-quadratic regulator) was used for the cantilever beam vibration control. For the 2L2JM and the 5-DOF manipulator, a H∞ controller was used. This was an optimal and robust controller based on the H∞ norm. Based on vibration evaluation, it was found that an active vibration suppression was necessary for the 5-DOF manipulator. Mathematical models of several systems were developed and verified using finite element analysis. The controllers suppressed random vibration that were applied to the base of the 5-DOF manipulator. For the closed-loop control system of the manipulator, a look-up table was created for the actuators. Through this study, the vibration of the 5-DOF manipulator was analyzed. Then, mathematical models of different geometries as well as the 5-DOF manipulator were obtained. Then these models were compared with the software models. The model reduction approach made the large finite element models reduce to systems with a small order. Using models and control strategies, simulation studies were conducted for the vibration suppression of the manipulator.
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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) | 0.001 | 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) | 0.004 | 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 it