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However, it is difficult to adjust the contact force dynamically due to the uncertainty of the geometric characteristics of the measured workpiece. In this paper, a contact force control method based on the combination of adaptive impedance controller and sliding mode variable structure position controller is proposed. First, the control process with the force tracking impedance control and a normal contact force calculation model is established. Then, a force-position conversion model and a sliding mode variable structure controller are proposed. Further, a simulation with a typical S-shaped measured surface is given to show that the algorithm for controlling contact force can achieve good real-time tracking performance and has stronger robustness than traditional methods. Finally, an arc-shaped aluminum alloy thin-wall part thickness is sampled along the scan trajectory to verify the effectiveness of the algorithm. The experimental results show that the proposed algorithm for controlling contact force can quickly adjust the measuring device to the target position and maintain the stability of the normal contact force to ensure the accuracy of ultrasonic thickness on-machine measurement.<\/jats:p>","DOI":"10.1177\/0142331221990924","type":"journal-article","created":{"date-parts":[[2021,2,20]],"date-time":"2021-02-20T17:24:41Z","timestamp":1613841881000},"page":"2461-2471","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":2,"title":["Scanning control based on real-time contact force feedback for ultrasonic thickness measurement"],"prefix":"10.1177","volume":"43","author":[{"given":"Haibo","family":"Liu","sequence":"first","affiliation":[{"name":"School of Mechanical Engineering, Dalian University of Technology, 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