6results about How to "High damping" patented technology

The invention discloses an active damping parameter design method and device for a grid-forming flexible DC converter station. The method comprises the following steps: obtaining negative sequence impedance according to voltage and current at a grid-connected point; according to the negative sequence impedance, obtaining active damping impedance in a plural form and converter station original impedance; according to the active damping impedance and the converter station original impedance, combining with a damping compensation controller to construct functions of an impedance real part about frequency change, and respectively obtaining a first function and a second function; the damping compensation controller sequentially comprises a band-pass filtering link, a gain resistance link and a compensation gain link; obtaining a negative sequence equivalent resistance expression of the AC side of the converter station according to the first function and the second function; obtaining a parameter range of a damping compensation controller according to the negative sequence equivalent resistance expression in combination with an integral area method; and selecting parameters of the damping compensation controller according to the parameter range.

This invention relates to a seismic energy-dissipating reinforcement device and method for reinforced concrete beam-column joints. The device includes: a first shape memory alloy (SMI) component located on the beam in the beam-column joint area; a second SMI component installed on the column in the beam-column joint area and connected to the first SMI component; and a sliding friction damper connecting the first and second SMI components at both ends. This invention ensures the rigidity of the beam-column joint using a shape memory alloy T-plate while simultaneously dissipating energy and limiting excessive displacement between the beam and column through a sliding friction damper, thereby preventing progressive collapse and enabling automatic repositioning of the joint after deformation, thus enhancing the reinforcement effect of the reinforced concrete beam-column joint.

The invention discloses a creep-resistant magnesium alloy with high elasticity modulus and high damping and a preparation method thereof, and the creep-resistant magnesium alloy with high elasticity modulus and high damping comprises the following components in percentage by mass: 1.2%-3.5% of Zn element, 2.5%-12% of Gd element, 0.5%-6% of Yb element, 0.15%-1.2% of Ni element, 0.3%-0.8% of Mn element, 0-0.5% of Cu element, 0.1%-5% of HRE element and the balance of Mg element. The HRE element is one or more of a Dy element, a Sm element and a Tb element, and the mixing enthalpy delta H of the creep-resistant magnesium alloy with the high elastic modulus and the high damping is-1.1 kJ / mol to-0.2 kJ / mol. The creep-resistant magnesium alloy with high elastic modulus and high damping is suitable for the fields of aerospace, precise instruments, transportation, 3C electronics and the like, and has remarkable technical and economic values.

The application relates to the technical field of damping materials, and discloses a high-damping wide-temperature-range damping material composition, a high-damping wide-temperature-range damping material and a preparation method and application thereof.The composition comprises the following components in parts by weight: 100 parts by weight of butyl rubber; 5-40 parts by weight of ultrahigh molecular weight polyisobutylene; 5-50 parts by weight of a reinforcing agent; 5-40 parts by weight of a synthetic resin; 1-5 parts by weight of a plasticizer; and 0-10 parts by weight of a compatilizer; the ultrahigh molecular weight polyisobutylene has a viscosity-average molecular weight of 4 million-12 million.The high-damping wide-temperature-range damping material composition has high damping performance and a wide damping temperature range, and can be applied to fields with high requirements for vibration reduction and noise reduction.

The utility model provides a kind of fiber winding bearing, comprising: bearing seat, the inside of bearing seat is provided with bearing body, lubricating mechanism is provided on bearing body, bearing body includes bearing outer ring, fixed groove is opened in the outside surface of bearing outer ring, the inside of bearing outer ring is integrally fixedly connected with outer fiber winding mold core, compared with prior art, the utility model has the beneficial effects as follows: by setting titanium alloy bearing outer ring, bearing inner ring and the bearing body of outer fiber winding mold core and inner fiber winding mold core composition, improve bearing body high strength, corrosion resistance and lightweight advantage, simultaneously by fiber winding mold core, further reduce weight and enhance damping performance, effectively absorb vibration and impact, reduce noise, by setting lubricating mechanism, continuously lubricated can effectively reduce the friction between ball and fiber winding mold core, reduce fiber winding mold core and the surface wear of ball, significantly prolong the service life of bearing.

The invention provides a composite damping emulsion, a water-based damping vibration attenuation coating and a preparation method of the water-based damping vibration attenuation coating, and belongs to the technical field of damping coatings. The composite damping emulsion is prepared from a waterborne polyurethane emulsion and an organic silicon modified core-shell type acrylate emulsion; the organosilicone modified core-shell type acrylate emulsion is synthesized by adopting a seed semi-continuous emulsion polymerization method and introducing organosilicone. The water-based damping vibration attenuation coating is prepared from 15 to 100 parts of composite damping emulsion; 20 to 120 parts of a functional filler; 1 to 6 parts of nanofiber; 5 to 30 parts of a flame retardant; 5 to 40 parts of deionized water; 0.1 part to 0.6 part of a pH (Potential of Hydrogen) regulator; and 1.8 to 15.6 parts of an auxiliary agent. The invention provides a two-component composite damping emulsion composed of a waterborne polyurethane emulsion and an organic silicon modified core-shell type acrylate emulsion, the two components form a cross-linked network structure, the cross-linked network structure and the functional filler have a synergistic effect, and the functional filler is uniformly dispersed in the emulsion, so that the damping performance of the coating is remarkably improved.