Monitoring sedimentation of magnetorheological fluids using an in-situ visual monitoring system with a wide-angle lens
ID：66
Submission ID：5 View Protection：ATTENDEE
Updated Time：2023-03-14 09:49:46 Hits：491
Oral Presentation
Abstract
Magnetorheological (MR) fluids shows great potential in the field of engineering vibration reduction. However, sedimentation of magnetorheological fluids will occurs inevitably due to the strong density difference between the dispersed phase and the dispersion medium. Sedimentation seriously affects the service life of the material and limits its engineering application range. Monitoring techniques of MR fluids can effectively solve the problem of sedimentation, which has a great significance to the redistribution of magnetorheological fluid after sedimentation. Therefore, monitoring techniques of MR fluids has received more and more attention.
In this paper, a set of visual monitoring system with optical system installed inside magnetorheological fluid damper is proposed and constructed. the system could monitor the whole domain of magnetorheological fluids in real time, and test concentration of each partition of MR fluids. Firstly, the image of magnetorheological fluids is collected in real time by installing a wide-angle lens in the small hole inside the damper. According to the camera calibration method, the internal parameters and deviation factor of the wide-angle lens are obtained. Then, the mapping relationship between the real image and the distorted image will be derived by utilizing the Distortion model , and then the coordinate transformation of the image is performed to correct the distortion of the wide-angle lens. Secondly, the image after distortion correction is filtered to solve the problem of uneven image intensity and magnetic particles on the lens surface. Finally, based on the Kynch’s sedimentation theory, the corresponding relationship between the sedimentation rate and concentration of MR fluids is deduced. According to the changing information of image chromaticity and brightness, the concentration value of magnetorheological fluids in each partition of the image will be deduced. The experimental results show that the system can accurately obtain the sedimentation partition and partition concentration information of magnetorheological fluids, effectively monitor the real-time sedimentation state of internal magnetorheological fluids online, and provide a strategic signal for the possible active or operable re-dispersion of MR fluids.
Keywords
magnetorheological fluids,sedimentation,images,visual monitoring
Submission Author
Yang Jie
Chongqing University of Science & Technology
Chen Shiwei
Chongqing University of Science & Technology
Jiang Pan
Chongqing University of Science & Technology
He Yang
Chongqing University of Science & Technology
Zhang Honghui
Chongqing University
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