4results about How to "Improved vibration characteristics" patented technology

A mold structure, pressure processing device, and pressure processing method are disclosed, which can reduce the impact of unstable positioning accuracy caused by the press body, eliminate the need for adjustment of the pressure processing device by a skilled person, have excellent productivity, and are easy to install and disassemble relative to the press body. The mold structure (1) includes a lower mold (3) fixed on a fixed table (2); an upper mold (4) disposed above the lower mold (3); a first elastic body (11) and a stop (10) disposed between the upper mold (4) and the lower mold (3); and a pressure adjustment device (6) connected to the movable table (5) of the upper mold (4). When the pressure processing is not pressurized, the first elastic body (11) separates the upper mold (4) and the lower mold (3). When the pressure processing is pressurized, the stop (10) specifies the bottom dead center position of the upper mold and applies pressure from the movable table (5) to the upper mold (40) through the pressure plate (7) of the pressure adjustment device (6) via the second elastic body (8), thereby clamping the material (30) to be processed between the upper mold (4) and the lower mold (3) for pressurization.

The invention discloses a supporting and lubricating device for a dynamic test of an engine turbine pump rotor. The supporting and lubricating device comprises a first supporting seat, a second supporting seat, an embedded oil spraying pipe, a quick-insertion oil supply connecting nozzle, a quick-insertion oil spraying bent pipe, a radial quick-insertion connector, a first swing frame and a second swing frame. The first supporting seat is arranged on the first swing frame, and the second supporting seat is arranged on the second swing frame; the first supporting seat and the second supporting seat are positioned on the same horizontal plane and are arranged in parallel; the first supporting seat is an independent rotary body, a first supporting seat axial oil supply hole is formed in the axial direction of the first supporting seat, and a first supporting seat radial oil supply hole and a first supporting seat through oil return hole which are communicated with the first supporting seat axial oil supply hole are formed in the radial direction of the first supporting seat; the high-efficiency, high-reliability and low-cost dynamic test requirements of the ultra-high-speed flexible rotor can be met, a supporting effect can be provided, efficient lubricating and cooling of paired bearings can be achieved in a small gap and a narrow space, and the matching precision with a dynamic test system is high.

The application discloses a preparation process of a lead zirconate titanate (PZT) film layer, a film layer structure and application thereof, and relates to the technical field of piezoelectric material film layer preparation. The preparation process comprises the following steps: S1, forming a low tensile stress silicon nitride layer on the surface of a substrate, which is used for homogenizing the in-plane stress gradient of a wafer; and S2, forming a piezoelectric functional layer on the surface of the silicon nitride layer in a sputtering mode, wherein the piezoelectric thin film material of the piezoelectric functional layer is lead zirconate titanate (PZT). The film layer structure and the preparation process thereof adopt the silicon nitride layer to relieve the thermal mismatch stress of the piezoelectric functional layer system, can improve the piezoelectric constant e31 of the central region of the wafer, and improve the uniformity of the whole wafer.

The invention discloses an active vibration reduction method and system for waveform remodeling of a power electronic interface industrial frequency transformer, and the method comprises the steps: firstly analyzing the correlation between the output voltage of an inverter and the vibration of the power electronic interface industrial frequency transformer, and deducing the relation between the output voltage of the inverter and the vibration acceleration of the power electronic interface industrial frequency transformer; thirdly, injecting third and fifth harmonics into the output voltage of the inverter to remodel the waveform of the inverter, obtaining an effective value of the vibration acceleration of the power electronic interface industrial frequency transformer after waveform remodeling, and then calculating the vibration acceleration of the power electronic interface industrial frequency transformer by taking the minimum effective value of the vibration acceleration as a target and the total voltage distortion rate as a constraint condition. And solving effective values and initial phases of third and fifth harmonics by using a particle swarm optimization algorithm to realize active vibration reduction of the power electronic interface industrial frequency transformer. According to the waveform remodeling active vibration reduction method for the power electronic interface industrial frequency transformer, the vibration acceleration of the power electronic interface industrial frequency transformer is effectively reduced, and low-vibration and stable operation is achieved.