Vibration isolation is vital in engineering machinery,as it not only seriously affects the service life of machine components but also reduces the operating efficiency.Recently,metamaterials have been proposed for cus...Vibration isolation is vital in engineering machinery,as it not only seriously affects the service life of machine components but also reduces the operating efficiency.Recently,metamaterials have been proposed for customized vibration-isolation needs through various functional designs.As a synthetic material,polymer materials have the advantages of good elasticity,low density,high specific strength,good corrosion resistance and easy processing,making it an ideal raw material for vibration-isolation metamaterials.At the same time,the rapid development of additive manufacturing(AM)provides a feasible method for preparing polymeric vibration-isolation metamaterials with complex structures.In this paper,we systematically analyze the vibration-isolation mechanism of metamaterials,review the applications of metamaterials in vibration isolation and the research on polymer metamaterials,and survey the AM process methods for polymer metamaterials.Finally,the prospects and directions for the development of polymer vibration-isolation metamaterials are envisioned,providing new ideas for further research on polymer metamaterials in the field of vibration isolation.展开更多
We investigated the behaviors of an active control system of two-stage vibration isolation with the actuator installed in parallel with either the upper passive mount or the lower passive isolation mount. We revealed ...We investigated the behaviors of an active control system of two-stage vibration isolation with the actuator installed in parallel with either the upper passive mount or the lower passive isolation mount. We revealed the relationships between the active control force of the actuator and the parameters of the passive isolators by studying the dynamics of two-stage active vibration isolation for the actuator at the foregoing two positions in turn. With the actuator installed beside the upper mount, a small active force can achieve a very good isolating effect when the frequency of the stimulating force is much larger than the natural frequency of the upper mount; a larger active force is required in the low-frequency domain; and the active force equals the stimulating force when the upper mount works within the resonance region, suggesting an approach to reducing wobble and ensuring desirable installation accuracy by increasing the upper-mount stiffness. In either the low or the high frequency region far away from the resonance region, the active force is smaller when the actuator is beside the lower mount than beside the upper mount.展开更多
基金supported by National Natural Science Foundation of China(Nos.52475398,52235008,and U2341270).
文摘Vibration isolation is vital in engineering machinery,as it not only seriously affects the service life of machine components but also reduces the operating efficiency.Recently,metamaterials have been proposed for customized vibration-isolation needs through various functional designs.As a synthetic material,polymer materials have the advantages of good elasticity,low density,high specific strength,good corrosion resistance and easy processing,making it an ideal raw material for vibration-isolation metamaterials.At the same time,the rapid development of additive manufacturing(AM)provides a feasible method for preparing polymeric vibration-isolation metamaterials with complex structures.In this paper,we systematically analyze the vibration-isolation mechanism of metamaterials,review the applications of metamaterials in vibration isolation and the research on polymer metamaterials,and survey the AM process methods for polymer metamaterials.Finally,the prospects and directions for the development of polymer vibration-isolation metamaterials are envisioned,providing new ideas for further research on polymer metamaterials in the field of vibration isolation.
基金the Natural Science Foundation of China under Grant No. 50075029
文摘We investigated the behaviors of an active control system of two-stage vibration isolation with the actuator installed in parallel with either the upper passive mount or the lower passive isolation mount. We revealed the relationships between the active control force of the actuator and the parameters of the passive isolators by studying the dynamics of two-stage active vibration isolation for the actuator at the foregoing two positions in turn. With the actuator installed beside the upper mount, a small active force can achieve a very good isolating effect when the frequency of the stimulating force is much larger than the natural frequency of the upper mount; a larger active force is required in the low-frequency domain; and the active force equals the stimulating force when the upper mount works within the resonance region, suggesting an approach to reducing wobble and ensuring desirable installation accuracy by increasing the upper-mount stiffness. In either the low or the high frequency region far away from the resonance region, the active force is smaller when the actuator is beside the lower mount than beside the upper mount.
