6results about How to "Reduced dynamic response" patented technology

The utility model discloses a kind of viscous damping wall devices for bridge, belong to damping equipment technical field, comprising: movable member is movably inserted in damping wall, damping cavity is provided in the damping wall, damping liquid is provided in the damping cavity, the movable member sliding connection with damping cavity can be with damping liquid and shear motion occurs, the movable member includes the fixed connection of fixed part with bridge superstructure, the fixed part bottom end sliding connection has the plugboard connecting piece that can be along bridge transverse sliding, plugboard connecting piece is fixedly connected with plugboard, the plugboard sliding connection is in damping cavity.The utility model is converted into heat energy dissipation by the internal friction effect between fluid molecules, and the mechanical vibration energy of structure is continuously converted into heat energy dissipation, to effectively reduce the dynamic response of structure.

The application discloses a large-span prestressed steel structure energy dissipation and vibration reduction self-resetting cable device, which comprises a baffle arranged on the left and right sides, a cable penetrating through the baffles, a cushion block and an anchor for anchoring the cable, a steel pull rod penetrating through the left and right baffles in sequence, a cushion plate welded at the two ends of the steel pull rod, a steel strand penetrating through the center of the steel pull rod, a second anchor for anchoring the steel strand, a spiral spring nested outside the steel pull rod and welded at the inner sides of the left and right baffles at the two ends, respectively, an upper dislocation plate welded at the inner side of the left baffle, a lower dislocation plate welded at the inner side of the right baffle, an energy dissipation device penetrating through upper and lower strip-shaped bolt holes in sequence, wherein the energy dissipation device comprises a screw rod, upper and lower nuts and upper and lower friction gaskets, and further comprises a friction energy dissipation block embedded between the upper and lower dislocation plates and a stopper for preventing the friction energy dissipation block from falling off; the device can realize energy dissipation and vibration reduction through the tensile and compressive deformation of the spiral spring and the relative sliding of the upper and lower dislocation plates, and can realize the self-resetting function through the steel strand in the steel pull rod and the spiral spring.

This invention relates to a triangular prism-type tuned mass damper suitable for large-span cantilever structures, comprising a triangular prism box (1), a particle damping unit (4) disposed within the triangular prism box (1), and a steel mass block (3). A high-damping spring (2) is located below the triangular prism box (1). The particle damping unit (4) includes a particle damping chamber (5), three different sized particle balls, and a foamed rubber pad (9). When the structural vibration amplitude is small, the particle balls dissipate energy by compressing the foamed rubber pad and rolling; when the structural vibration amplitude is large, the particle balls dissipate energy by colliding and compressing the foamed rubber. Compared with the prior art, this invention achieves a phased energy dissipation mechanism while solving the problems of narrow vibration reduction bandwidth, large motion stroke, and noise generated by particle collisions in traditional mass tuned dampers.

The invention discloses a photovoltaic array adaptive global maximum power point tracking method and system. The method comprises the following steps: solving global maximum power point reference voltage and global maximum power point reference power output by a photovoltaic array based on current environment data by adopting a two-stage nested multi-strategy particle swarm algorithm; judging whether a preset accurate control switching condition is met or not according to the output power of the photovoltaic array and the global maximum power point reference power; if a precise control switching condition is met, switching to a self-adaptive super-spiral sliding mode control mode, otherwise, maintaining a PI control mode; driving a power switch tube in the DC-DC converter to act by using a PI control mode or a self-adaptive super-spiral sliding mode control mode; according to the method, reference parameters are solved through the two-stage nested multi-strategy optimization particle swarm optimization algorithm, a dual-mode switching mechanism of PI control and self-adaptive super-spiral sliding mode control is matched, accurate and rapid tracking of the global maximum power point in a complex environment is achieved, and steady-state power fluctuation is effectively restrained.

The utility model provides a kind of bicycle hub and bicycle, it is related to bicycle technical field, including axle core and the shell and tower base of being sleeved on axle core, wherein shell and tower base are formed with the installation cavity for assembling ratchet structure between, ratchet structure includes first ratchet piece, second ratchet piece and elastic piece, first ratchet piece and second ratchet piece are all sleeved on axle core, first limiting portion for being limited with first ratchet piece along the circumference is shaped in shell, second limiting portion for being limited with second ratchet piece along the circumference is shaped in tower base, elastic piece is located in the other side of second ratchet piece relative to first ratchet piece, to make first ratchet piece limit along the axial direction, second ratchet piece can reciprocate along the axial direction, so that the second helical tooth on the end face of second ratchet piece and the first helical tooth on the end face of first ratchet piece can be one-way engagement. To improve the problem that existing bicycle hub structure is easy to wear and tear and the number of parts is more.

The invention provides an offshore wind turbine cable protection device using buoyancy blocks. The offshore wind turbine cable protection device comprises a cable suspension section protection assembly and a cable towing section protection assembly. The cable suspension section protection assembly comprises an internal anti-bending device, an external anti-bending device and a spiral strake sleeve, the internal anti-bending device is connected with the external anti-bending device through barbs, and the spiral strake sleeve is connected with the external anti-bending device through a sleeve joint; the cable towing section protection assembly comprises an anti-abrasion sleeve and a buoyancy block, the anti-abrasion sleeve is connected with the spiral strake sleeve, and the anti-abrasion sleeve is sleeved with the buoyancy block. According to the invention, the comprehensive protection of the cable is realized, the overall dynamic response and vortex-induced vibration response of the fan cable under the action of wave current can be effectively reduced, the wear of the cable is remarkably reduced, and the service life of the fan cable is prolonged.