7results about How to "Vibration reduction frequency bandwidth" patented technology

The invention discloses an induction power generation and frequency modulation vibration reduction integrated ballastless track vibration reduction structure, and belongs to the technical field of track traffic. A track plate and a base plate are longitudinally laid along a track line, and the track plate is located above the base plate; the adjusting layer is arranged between the track plate and the base plate; an elastic vibration reduction layer is arranged between the base plate and the piezoelectric device layer, and the elastic vibration reduction layer is filled in a limiting structure in the base plate; a silicon steel sheet iron core structure of an electromagnetic coil is arranged in the elastic vibration reduction layer in the limiting structure; the piezoelectric device layer is located between the adjusting layer and the base plate and connected with the electromagnetic coil through a wire. The piezoelectric material and the magneto-rheological elastomer material are adopted, integration of induction power generation and frequency modulation vibration reduction is achieved, when the pressure is not enough to enable the piezoelectric device to output current, the magneto-rheological elastomer material still has the mechanical property of a common rubber elastomer, the whole structure still can guarantee the vibration reduction function, and meanwhile power-off protection is achieved.

The inerter vibration reduction device comprises a frame body, a mass block, a plurality of elastic pieces, a transmission mechanism and at least one pair of damping mechanisms, the frame body is provided with a first side wall and a second side wall which are perpendicular to each other, and the mass block is arranged in the frame body and is opposite to the first side wall; the plurality of elastic pieces are abutted between the first side wall and the mass block; the transmission mechanism is connected to the side, away from the elastic piece, of the mass block. The damping mechanisms are connected to the transmission mechanism and are symmetrically arranged with the horizontal axis as the symmetry axis. Acting force is transmitted to the transmission mechanism through the mass block, translation energy is converted into rotation energy through the transmission mechanism, and then the rotation energy is consumed through the damping mechanism. Therefore, enough adjusting frequency band is ensured, and after the external load stops, the inertia damping device can avoid the adverse effect on the structure due to the hysteresis of the inertia.

The invention relates to a self-energized magnetorheological-variable inerter intelligent damper. The damper comprises a magneto-rheological cavity, a tuning cavity, a motion conversion cavity, a variable inerter cavity and an energy collection cavity which are sequentially connected in the axis direction of the damper and separated through partition plates, and the damper plays a role in stages under different excitations. The working mechanism of the self-energy-supply damper is phased control, dispersed energy harvesting and concentrated energy consumption, namely energy storage of the damper and broadband passive control are achieved under small-amplitude vibration; under large-amplitude vibration, all the cavities play a role together, energy release of the damper and active and passive hybrid control are achieved, and the magneto-rheological cavities can adaptively control the output force of the damper in stages according to the structural vibration condition. Compared with the prior art, the broadband vibration control target of the structure is achieved, the operation energy consumption of the damper can be reduced, and the double benefits of improving the control performance and reducing the operation cost are achieved.

The invention discloses a flexible mechanical arm main resonance control method based on nonlinear feedback and time delay feedback, and the method mainly comprises the steps: carrying out the discretization of the transverse deformation of a flexible mechanical arm through employing a hypothesis modal method, and obtaining a vibration equation of the flexible mechanical arm; a linear feedback control item, a nonlinear feedback control item and a time-delay feedback control item are introduced to form a control signal model of the vibration absorber. Constructing a vibration absorber control signal model; a Kane equation is used for establishing a flexible mechanical arm system vibration control model including the vibration absorber; solving an approximate analytic solution of the system vibration equation by applying a multi-scale method to obtain a single-mode solution and a dual-mode solution of the system steady-state response; and finally, under the coexistence state of the internal resonance condition and the main resonance condition of the flexible mechanical arm system in which the vibration absorber is included, the main resonance of the flexible mechanical arm is controlled, and the modal amplitude of the first-order modal of the main resonance of the flexible mechanical arm is well inhibited.

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.

The invention relates to a high-reliability low-frequency broadband coupling damping vibration absorber which comprises an outer shell and an oscillator system arranged in the outer shell. The oscillator system comprises two oscillator units with different resonant frequencies; the two oscillator units are connected in an inner and outer nesting manner; each vibrator unit comprises a three-dimensional mass block, flexible side edge connecting pieces arranged on the two opposite sides of the three-dimensional mass block respectively, and a spring connecting structure arranged at the bottom of the three-dimensional mass block. In the vibrator system, the vibrator unit located on the outer side is connected with the side wall of the outer shell based on a flexible side edge connecting piece, and the vibrator units arranged inside and outside in a sleeved mode are connected based on the flexible side edge connecting piece of the vibrator unit on the inner side. The two vibrator units are respectively connected with the bottom of the outer shell based on the spring connecting structures. The low-frequency vibration absorption effect is enhanced through coupling of the inner vibrator unit and the outer vibrator unit, the high-frequency vibration absorption effect is considered, and the vibration absorber is compact in structure and high in reliability, impact resistance and creep resistance.

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.