# US 11,906,011 B2 · Magnetorheological fluid particle impact damper > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,906,011 B2 - Document ID: US11906011B2 - Status: Granted - Kind: B2 - Application number: 17/383,802 - Filed: 2021-07-23 - Published: 2021-11-11 - Granted: 2024-02-20 - Earliest claimed: 2020-01-13 - Assignees: University of Shanghai for Science and Technology - Applicants: University of Shanghai for Science and Technology - Inventors: Yanchen Du; Junwen Lin - Web page: https://patentgrep.com/patent/US11906011B2 ## CPC - F16F 13/00: Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs (F16F5/00, {F16F6/00, F16F9/003} take precedence) - F16F 15/023: using fluid means - F16F 15/06: with metal springs (with rubber springs also F16F15/08) - F16F 2222/12: Fluid damping - F16F 2224/045: magnetorheological - F16F 2228/066: Variable stiffness - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION ## Abstract Disclosed is a magnetorheological fluid particle impact damper, which includes a damper cavity unit, wherein the damper cavity unit is provided with an electromagnetic coil in a circumferential direction, the damper cavity unit is internally provided with a plurality of horizontal shock absorbers in a uniform manner, and the left and right ends of the damper cavity unit are symmetrically provided with disc-type shock absorbers; the shock absorbers and the disc-type shock absorbers are respectively connected to the inner wall of the damper cavity unit through springs; the horizontal shock absorber includes a horizontal magnetorheological fluid cavity filled with magnetorheological fluid, the horizontal magnetorheological fluid cavity is internally provided with a horizontal impactor container, the horizontal impactor container is internally provided with a first impactor group consisting of several impactors of different sizes; the disc-type shock absorber comprises a disc-type magnetorheological fluid cavity which is filled with magnetorheological fluid; the disc-type magnetorheological fluid cavity is slidably connected to a plurality of disc-type impactor containers, and the disc-type impactor containers are distributed in a circular array and internally provided with a second impactor group; and the present disclosure effectively improves the vibration reduction effect. ## Claims ### Claim 1 A magnetorheological fluid particle impact damper, comprising a damper cavity unit (2), wherein the damper cavity unit (2) is provided with an electromagnetic coil (1) in a circumferential direction; the damper cavity unit (2) is internally provided with a plurality of horizontal shock absorbers in a uniform manner, the left and right ends of the damper cavity unit (2) are symmetrically provided with disc-type shock absorbers, the outer diameter of the disc-type shock absorber is smaller than the inner diameter of the damper cavity unit (2); the horizontal shock absorbers and the disc-type shock absorbers are respectively connected to the inner wall of the damper cavity unit (2) through springs; the horizontal shock absorber comprises a horizontal impactor, which is connected to an inner wall of the damper cavity unit (2) through a spring; the horizontal impactor is internally provided with a horizontal magnetorheological fluid cavity (5); the horizontal magnetorheological fluid cavity (5) is internally provided with a horizontal impactor container (6); and the horizontal impactor container (6) is internally provided with a first impactor group consisting of several impactors of different sizes; the disc-type shock absorber comprises a disc-type impactor, which is connected to an inner wall of the damper cavity unit (2) through a spring; the disc-type impactor is internally provided with a disc-type magnetorheological fluid cavity (18); the disc-type magnetorheological fluid cavity (18) is slidably connected to a plurality of disc-type impactor containers (19), and the disc-type impactor container (19) is distributed in a circular array; the disc-type impactor container (19) is internally provided with a second impactor group; and the horizontal magnetorheological fluid cavity (5) and the disc-type magnetorheological fluid cavity (18) are both filled with magnetorheological fluid. ### Claim 2 (depends on 1) The magnetorheological fluid particle impact damper according to claim 1, wherein the damper cavity unit (2) is a cylindrical structure, and the disc-type shock absorber is circular; a plurality of the horizontal shock absorbers are uniformly distributed in a circular array inside the damper cavity unit (2). ### Claim 3 (depends on 1) The magnetorheological fluid particle impact damper according to claim 1, wherein the horizontal shock absorber further comprises a chute (15), and the horizontal impactor is slidably connected to the chute (15). ### Claim 4 (depends on 1) The magnetorheological fluid particle impact damper according to claim 1, wherein the first impactor group comprises a plurality of first impactors and a plurality of second impactors; the first impactors and the second impactors are spaced apart and arranged concentrically on a same track; the first impactors are arranged at the left and right ends of the horizontal impactor container (6); the size of the first impactors is larger than the size of the second impactors; and the second impactor group comprises a plurality of third impactors; and the horizontal impactor further comprises two first damping rods (7), and the two first damping rods (7) are respectively arranged on left and right sides of the horizontal impactor container (6); one end of the first damping rod (7) is connected to the first impactor, and the other end of the first damping rod (7) is in contact with the magnetorheological fluid in the horizontal magnetorheological fluid cavity (5). ### Claim 5 (depends on 4) The magnetorheological fluid particle impact damper according to claim 4, wherein the bottom of the horizontal impactor container (6) is provided with a slide rail, and the first impactor and the second impactor are slidably connected to the slide rail. ### Claim 6 (depends on 1) The magnetorheological fluid particle impact damper according to claim 1, wherein the disc-type magnetorheological fluid cavity (18) comprises an inner ring and an outer ring, and the inner ring is connected to the bottom of the outer ring; the disc-type impactor container (19) is arranged at a groove between the inner ring and the outer ring; and two ends of the disc-type impactor container (19) are respectively fixedly connected to a second damping rod (17), and the disc-type impactor container (19) is in contact with the magnetorheological fluid in the disc-type magnetorheological fluid cavity (18) through the second damping rod. ### Claim 7 (depends on 1) The magnetorheological fluid particle impact damper according to claim 1, wherein the spring is a variable stiffness spring. ### Claim 8 (depends on 1) The magnetorheological fluid particle impact damper according to claim 1, wherein the magnetorheological fluid consists of three parts: soft magnetic particles, carrier fluid, and additives. ### Claim 9 (depends on 1) The magnetorheological fluid particle impact damper according to claim 1, wherein the first impactor group and the second impactor group are both composed of several pulleys and particles, and the particles are composed of one or more of ceramic, quartz stone, metal, and concrete, and the diameter of the particles is 5-50 mm. ### Claim 10 (depends on 1) The magnetorheological fluid particle impact damper according to claim 1, wherein the size of the output magnetic field of the electromagnetic coil (1) can be adjusted.