Vibration instability, known as chatter, presents a major challenge in machining, affecting both productivity and the quality of the final products. This project investigates the dynamics of chatter in different machining processes, aiming to create reliable and practical methods for identifying parameters that avoid chatter. By analyzing the root causes of chatter and its effects on various machining operations, we aim to develop strategies that improve process stability, boost efficiency, and enhance overall productivity. Our methods include experimental and operational modal analysis, Bayesian model updating, and data-driven modelling. For more details, please refer to the following articles.

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• Ahmadi, K. Finite strip modeling of the varying dynamics of thin-walled pocket structures during machining. Int J Adv Manuf Technol 89, 2691–2699 (2017). https://doi.org/10.1007/s00170-016-8931-7

• Stefani, J., Ahmadi, K., and Tuysuz, O. (February 14, 2018). "Finite Strip Modeling of the Varying Dynamics of Shell-Like Structures During Machining Processes." ASME. J. Manuf. Sci. Eng. April 2018; 140(4): 041015. https://doi.org/10.1115/1.4039107

• Kim, S., and K. J. M. S. Ahmadi. "Estimation of vibration stability in turning using operational modal analysis." Mechanical Systems and Signal Processing 130 (2019): 315-332. https://doi.org/10.1016/j.ymssp.2019.04.057

• Ringgaard, Kasper, et al. "Optimization of material removal rate in milling of thin-walled structures using penalty cost function." International Journal of Machine Tools and Manufacture 145 (2019): 103430. https://doi.org/10.1016/j.ijmachtools.2019.103430

• Ahmadi, Keivan. "Bayesian updating of modal parameters for modeling chatter in turning." CIRP Journal of Manufacturing Science and Technology 38 (2022): 724-736. https://doi.org/10.1016/j.cirpj.2022.06.006