2results about How to "Vibration reduction frequency bandwidth" patented technology

The application discloses a parallel hole damping-spiral tube inerter underwater damping device and belongs to the technical field of underwater vibration control. The device comprises an upper shell, a lower shell, a damping spring, an open small hole damping and an open fluid inerter. The upper shell and the lower shell are two parts in relative sliding. The damping spring and the open small hole damping are assembled in parallel to form an integral body, which together constitutes an open spring damping. The open spring damping and the open fluid inerter are connected in parallel, and the upper and lower ends of the two are respectively fixed to the upper shell and the lower shell. The open small hole damping and the open fluid inerter are both installed in the upper shell and the lower shell. The application adopts a parallel topology structure of inerter, damping and spring. The double spiral pipes and the symmetrical piston rods realize the fluid inerter effect in two directions. The small holes on the damping piston realize the speed-dependent throttling damping. The device has the characteristics of wide frequency vibration isolation, strong static load capacity, symmetrical positive and negative characteristics and deep water environment.

This invention relates to the field of high-speed railway vibration and noise control technology, specifically to a track-mounted vibration reduction device and a shield tunnel track-mounted vibration reduction structure. The device includes a sealed housing containing multiple resonant metal plates arranged at intervals. Each resonant metal plate has a perforation array. The sealed housing is filled with a viscous damping medium, which completely submerges the perforation array. When the track-mounted vibration reduction device of this invention is in operation, the resonant metal plates undergo bending vibration, transferring the vibration of the track structure to the resonant metal plates. The vibration of the resonant metal plates is dissipated by the frictional energy dissipated by the viscous damping medium through the perforations. Through the coupling effect of the bending vibration of the resonant metal plates and the flow of the damping medium through the perforations, the vertical vibration kinetic energy of the track is converted into structural strain energy and fluid frictional heat energy, thereby suppressing the transmission of vibration energy in the 30-80Hz frequency band.