3results about How to "Improve local stiffness" patented technology

This invention discloses an additive manufacturing-based inertial amplification nonlinear low-frequency vibration isolation metamaterial structure, vibration isolation device, and its performance control method. The vibration isolation metamaterial structure includes a rhombic frame structure, an inertial amplification unit, and a square spring structure. The square spring structure is arranged within the rhombic frame structure, with its two ends connected to a pair of opposite corners of the rhombic frame structure. The elastic extension direction of the square spring structure is parallel to the diagonal of this pair of opposite corners of the rhombic frame structure. The inertial amplification unit has a centrally symmetrical structure, including a rigid rod, two counterweights, and two diagonal rods. The center of symmetry of the inertial amplification unit, the center of the rhombic frame structure, and the center of the square spring structure all coincide in projection. Therefore, the vibration isolation metamaterial structure of this invention significantly widens the bandgap range and enhances low-frequency vibration isolation performance, exhibiting excellent performance in suppressing longitudinal waves in the 0-1000Hz low-frequency range, increasing vibration damping, and energy absorption.

This invention discloses a flexible assembly fixture and method for aircraft winglets, comprising: a robot and an end effector, a fixture frame, positioning pins, positioning-clamping components, an interface plate, and a storage rack for the positioning-clamping components. The robot is used for automatic reconfiguration of the fixture; the robot's end effector is used for installing and removing the positioning-clamping components; the fixture frame is welded from columns and beams, with threaded holes distributed on each column and beam for mounting components; the positioning pins are installed on the fixture frame through the threaded holes; the positioning-clamping components are installed on the fixture frame through the interface plate to position and clamp the winglets; the interface plate is installed on the main fixture frame through the threaded holes; unused positioning-clamping components can be placed in its storage rack. This invention has the advantages of intelligent reconfigurability, high automation, adaptive support, and stable clamping, and is suitable for the assembly needs of various winglet specifications.

The application relates to the field of bridge engineering and provides a layout method and a construction method of a shear connector of a fabricated steel-concrete composite girder bridge, which are based on machine-bridge coupling vibration response, a finite element model of a steel-concrete composite taxiway bridge is established, the influence of bolt cluster degree and unevenness parameters on the dynamic performance of the fabricated steel-concrete composite girder bridge is deeply studied, the layout mode of the shear connector is optimized, the vibration response under the machine-bridge coupling effect is effectively reduced, and the performance of the bridge structure under the action of the airplane dynamic load and the operation quality of the airplane are improved. Compared with the prior art, the application can significantly reduce the vibration response of the bridge under the airplane dynamic load, prolong the service life of the bridge, and improve the comfort of airplane operation. The technical scheme of the application provides a new theoretical basis and practical guidance for the design and construction of the steel-concrete composite girder bridge, and has important engineering application value and market promotion prospect.