43results about How to "Improved damping performance" patented technology

The invention belongs to the field of street lamps, the invention relates to a buffer-type safe anti-collision street lamp. The street lamp comprises a rod body and a protective shell, an annular damping plate is fixedly mounted at the upper end of the protective shell, the lower end of the rod body penetrates through the annular damping plate and extends into the protective shell, the side wallsof the two sides of the rod body are movably connected with the inner side wall of the protective shell through two pressing plates, the rod body and the protective shell are fixed through a pressurespring, a damping box is slidably connected to the inner bottom face of the protective shell, a lifting plate is slidably connected to the inner side wall of the damping box in a sealed mode, a vent hole is formed in the lifting plate, a flow limiting valve is arranged in the vent hole, the lower end of the rod body is fixedly connected with the lifting plate, and the lifting plate is fixedly connected with the inner bottom face of the damping box through a supporting spring. When a vehicle collides with the rod body, a good damping effect is achieved, the possibility that the rod body is bentdue to vehicle collision is greatly reduced, and further deterioration of traffic accidents is avoided.

The invention provides a transformation strengthened cold-machined high-strength steel, a steel tube and a manufacturing method thereof. The steel comprises the following chemical components in percentages by weight: 0.11-0.17% of C, 0.1-0.5% of Si, 0.5-2.0% of Mn, 0.01-0.05% of Al, 0.001-0.01% of Ca, less than or equal to 0.015% of P, less than or equal to 0.003% of O, less than or equal to 0.005% of S, less than or equal to 0.004% of N, and the balance of Fe and inevitable impurities, and meanwhile, the following relationship is required to be satisfied: 0.3%<C*Mn+Cr+2Mo<1.1%. The cold-machined high-strength steel tube is prepared by a transformation strengthened and strain strengthened composite process, the yield strength of the steel tube reaches 890 MPa or above, the elongation is greater than or equal to 10%, the structure of the steel tube is deformation ferrite and tempered martensite, and damping performance is excellent.

The invention belongs to the field of composite materials, and specifically discloses a high-damping fiber-reinforced resin-based composite material and a preparation method thereof. The fiber-reinforced resin-based composite material includes a resin matrix, fibers and a three-dimensional nanostructure, wherein the three-dimensional nanostructure Located at the intersection interface between the resin matrix and the fiber, the three-dimensional nanostructure includes two-dimensional nanomaterials and one-dimensional nanomaterials; The directions are the same; the one-dimensional nanomaterial is grafted on the two-dimensional nanomaterial, and its direction is perpendicular to the fiber direction. The invention introduces a novel three-dimensional nanostructure at the interface between the fiber and the resin, which can not only improve the mechanical properties of the composite material, but also significantly enhance the damping and shock absorption performance, so that it has very broad application prospects in the fields of aerospace, transportation and the like.

The invention belongs to the fields of building materials and construction technology. Light-weight concrete consists of a concrete base layer and waterproof surface layers, wherein the concrete base layer comprises the following components in parts by weight: 100 parts of cement, 0.1-10 parts of chrysotile fibers, 0.01-2 parts of water repellent, 10-30 parts of pulverized fuel ash, 0.1-6 parts of water reducer, 50-200 parts of water, and 1-20 parts of foaming agent or air entraining agent; the upper side and the lower side of the concrete base layer are coated with the waterproof surface layers which comprise the following components in parts by weight: 100 parts of penetrating type organosilicon waterproofing agent, 0.1-20 parts of nano TiO2, 0-2 parts of activity enhancer, 0.01-5 parts of dispersion stabilizer, and 50-200 parts of solvent. Correspondingly, the microporous structure of the foam concrete or air-entrained concrete is uniform, and the mechanical performance is improved.