4results about How to "High stiffness" patented technology

The application discloses a load self-adaptive electromagnetic quasi-zero stiffness vibration isolation device and method, which comprises a vibration isolator frame, a linear motion assembly arranged in the vibration isolator frame, a negative stiffness structure assembly, a positive stiffness structure assembly and a circuit control module connected with the linear motion assembly, the negative stiffness structure assembly and the positive stiffness structure assembly respectively, wherein the linear motion assembly is arranged in the central axis direction of the vibration isolator frame, the negative stiffness structure assembly without a bistable state characteristic is sequentially connected with the positive stiffness structure assembly with a nonlinear gradual hardening characteristic and connected with the linear motion assembly. The quasi-zero stiffness characteristic is realized by modulating the negative stiffness with the nonlinear gradual hardening positive stiffness. The electromagnetic negative stiffness coil and the electromagnetic positive stiffness coil are connected in series, and the rated load of the vibration isolator can be changed without the quasi-zero stiffness characteristic only by adjusting the current of the coil. The rated load self-adaptation and real-time adjustment of the quasi-zero stiffness vibration isolator are realized by cooperating with a sensor and a microprocessor.

The utility model relates to an equal-strength steel truss reinforcing structure of a structural damage PC box girder, and belongs to the technical field of building structure reinforcing. Comprising a steel truss with the same strength as a PC box girder, and the steel truss is of a cuboid space steel truss structure; a plane truss is arranged on the face, opposite to the steel truss, of the web plate, and the plane truss and the steel truss are fixed to the two sides of the web plate through opposite-pull screws. The steel truss is located on the inner side or the outer side of the web. Anchor bolts and steel gaskets are further arranged on the opposite-pull screws to reinforce and fix the steel trusses and the plane trusses and anchor the opposite-pull screws. And the opposite-pull screws are arranged at the joints of the chord members in the steel truss. A steel-concrete transition connecting section is arranged at the end part of the steel truss and is fixed through an opposite-pull screw rod; and the number of the opposite-pull screws on the transition connecting section is determined according to the tensile force borne by the steel truss chord member and the tensile force which can be borne by a single opposite-pull screw. The equal-strength steel trusses are arranged on the box girder in the damaged area, and meanwhile small original structure damage and a strong reinforcing effect are guaranteed.

The invention discloses an asymmetric negative Poisson's ratio sound absorption sandwich structure filled with PMI foam, and belongs to the field of structure protection and noise protection. The asymmetric concave honeycomb sandwich structure based Helmholtz resonator comprises an asymmetric concave honeycomb sandwich structure array, a Helmholtz resonator realized based on asymmetric concave honeycomb unit cell elements, and a PMI foam filler. The asymmetric concave honeycomb sandwich structure array is formed by arranging N asymmetric concave honeycomb cell elements, and the cell elements are asymmetric concave honeycomb cell elements formed by converting four outward inclined walls into inward inclined walls on the basis of honeycomb structure unit cell elements. When a protected object is subjected to an external pressure load, the asymmetric concave honeycomb cell elements absorb energy based on the negative Poisson's ratio effect and the PMI foam, and compression resistance and energy absorption are achieved; when a protected object is interfered by noise, the Helmholtz resonator structure in the sandwich structure can play a role in sound absorption, and finally the asymmetric negative Poisson's ratio sound absorption sandwich structure filled with PMI foam has both pressure-absorption-resistant mechanical protection performance and acoustic noise reduction performance.

The utility model belongs to road construction technical field relates to a kind of road construction with permanent and temporary combination car ferry device. Permanent and temporary combination car ferry device has multiple stone cages being set along the longitudinal axis direction of channel ferry retaining wall;Each stone cage is multiple, and the number of upper stone cage is less than the number of lower stone cage, so that multiple stone cages in longitudinal axis direction are set to form stepped structure's stone cage retaining wall in stepped shape;Each stone cage is the structure with diamond mesh by steel wire weaving, each stone cage has multiple length direction setting partition net, multiple partition net separates the space in stone cage into multiple stone cage unit grid, each stone cage unit grid is filled with block stone and concrete hollow block;Block stone and concrete hollow block are arranged in stone cage unit with interval, and in river direction, concrete hollow block forms interval column with 1m net distance. The utility model provides convenience for both sides of river highway construction period construction material transportation, and improves work efficiency.