Design and machining application of a two-DOF magnetic tuned mass damper

The cutting efficiency and surface quality in the machining of compliant workpieces have been severely affected by machining vibration. As industrial workpieces are most likely to have multiple flexible modes due to its complex geometry and each mode can only be damped by a single vibration mode of a tuned mass damper (TMD), a two-degree-of-freedom (DOF) magnetic TMD (MTMD) is designed for damping the vibration of aluminum thin-frame workpiece with multiple modes. The natural frequencies of the MTMD are designed to be adjustable as evidenced by hammer tests and are tuned to coincide with the modes of the workpiece. Eddy current damping is incorporated for promoting damping by utilizing the relative motion between the mass block and magnets inside the MTMD. Frequency response functions demonstrate that the MTMD is effective in attenuating the amplitude of the first and second modes by 21.6 and 12.1 dB. Milling tests are finally carried out to validate its effectiveness.

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