Composite collaborative acoustic metamaterials: Isolating shaft vibration of guide roller in printing machine

During the operation of the unit type gravure press, the violent mechanical vibration generated by the guide roller will seriously affect the stability of the unit operation, and causing transmission faults such as wrinkle, offset, scratch or fracture, and reducing the printing accuracy. To this problem, a novel multi-approach composite collaborative vibration isolator which combines the local resonator and multi-layer composite structure is proposed to solve the problems of vibration suppression in the single frequency and vibration energy dissipation in the full frequency band, respectively, and the theoretical model on the proposed isolator is established basing on dynamic stiffness method. For demonstrating isolation performance, the regularized normalized modal displacement, power loss density, elastic strain energy density, total kinetic energy, and vibration transmission ratio can be discussed. The results show that the composite vibration isolator has a wide vibration isolation band, and the vibration wave has two attenuation bands within 0–2000 Hz. The first attenuation band is 188–224 Hz and the width is 36 Hz; the second attenuation band is greater than 328 Hz. When the band of the vibration isolator is above 700 Hz, the vibration transmission ratio shows a monotonous decreasing trend. Furthermore, an experimental platform for the vibration isolation device of the guide roller is established to verify the vibration isolation performance. When the drive motor frequency is 20 Hz, the composite vibration isolator has the best vibration isolation effect. At the same time, the vibration isolation effect gradually decreases with the increase of the guide roller speed, but it still has preferable vibration isolation performance under various working conditions.