3results about How to "Reduce dynamic stress" patented technology

The utility model discloses a steel structure beam column connecting structure with damping damper, including steel beam and steel column, be provided with damping damper between steel beam and steel column, the damping damper includes shell, piston, piston rod and damping medium, the shell fixed connection is established on the steel column, the piston sets up in the shell inside and with shell sliding seal connection, one end of piston rod is fixedly connected with the piston, and the other end is out of the shell and is fixedly connected with steel beam, the shell inside is filled with damping medium, the piston reciprocating motion in the shell under the action of vibration, generates damping force through extruding damping medium to consume vibration energy. The utility model improves the damping performance of steel structure beam column connecting structure to enhance the anti -seismic performance and wind -resistance of steel structure building.

The invention provides a blisk active detuning non-integral-order vibration reduction method, and belongs to the technical field of aero-engines, and the method comprises the following steps: obtaining a rotor tip pressure pulsation non-integral-order frequency, segmenting a blisk into a sector cyclic symmetry model, carrying out modal analysis, obtaining inherent frequencies corresponding to first twelve orders of vibration modes, and carrying out modal analysis on the inherent frequencies; when the inherent frequency of a certain order and the non-integral-order frequency meet a preset condition, the corresponding vibration mode is a non-integral-order sensitive vibration mode; the aerodynamic damping of the rotor blade under different pitch diameters of the non-integral-order sensitive vibration mode is calculated, and the corresponding pitch diameter when the aerodynamic damping is minimum is obtained; the method comprises the following steps: measuring the frequency of all rotor blades of an actual blisk under a non-integral-order sensitive vibration mode, and circumferentially dividing the rotor blades into M frequency interval bands based on the actual frequency; and performing frequency correction on the rotor blade based on the M parity and the pitch diameter difference value corresponding to the minimum M and aerodynamic damping so as to realize active detuning. According to the method, non-integral-order vibration reduction design can be realized without changing pneumatic design parameters of the blade.

The application discloses a composite buffer type low-damage brake performance enhancing device, which comprises a brake disc, a first brake assembly and a U-shaped block arranged on the brake disc, a blocking mechanism arranged on the U-shaped block, a driving mechanism arranged on the U-shaped block and a second brake assembly arranged on the driving mechanism, and the U-shaped block is inverted U-shaped; the second brake assembly comprises double-cylinder friction mechanisms and single-cylinder friction mechanisms which are simultaneously arranged on the output end of the driving mechanism, an E-shaped block is arranged on the double-cylinder friction mechanisms, and the lower middle part of the E-shaped block is slidably connected with the upper end of the single-cylinder friction mechanisms; the blocking mechanism is used for blocking the E-shaped block, so as to block the movement of the double-cylinder friction mechanisms and make the single-cylinder friction mechanisms be able to be compressed on both sides of the brake disc; air inlet mechanisms and air outlet mechanisms are arranged on the upper end of the E-shaped block, and a first air outlet groove for air outlet is arranged on the blocking mechanism. The application has the advantages of high-efficiency heat dissipation, adjustable composite brake mode, low abrasion and buffering and damping.