Research on embedded locally resonant metamaterials used for vibration attenuation of thin-walled workpieces in mirror milling

The shell composed of large-scale parts is the essential component of mechanical structures in the aerospace, shipping, and railway industries. These workpieces are characterized by thin walls and weak rigidity, thus requiring an effective technology for high-performance machining. Accordingly, an embedded locally resonant metamaterial with double resonators is proposed and combined with the magnetic follow-up support technology to attenuate the vibration of thin-walled parts for the first time. The band structures and parametric adjustment laws are systematically investigated and validated by analytical calculation and finite element method, which proves the proposed model is broadband, lightweight, and flexible in low frequencies. Its characteristics, as well as the relatively simple structure, are unique advantages for thin-walled structure milling. Finally, mirror milling experiments have been performed to assess the slave module with the proposed substructure. From the results, the root mean square amplitude of the thin-walled workpiece with the combined device decreases by nearly 9%, which means that the performance has been improved by the combined device. Furthermore, this work provides an integrated and efficient solution for vibration suppression in thin-walled parts milling, which extends locally resonant metamaterials to practical engineering fields and helps to improve the status quo of mirror milling from the perspective of metamaterials.