3results about How to "Improve high frequency response" patented technology

The application provides a piezoelectric decoupling type thruster three-direction excitation force measuring device and measuring method, relates to the technical field of propeller excitation force measurement, and comprises a three-direction piezoelectric force sensor, a propeller and a transmission shaft. One end of the three-direction piezoelectric force sensor is connected with the propeller, the other end of the three-direction piezoelectric force sensor is connected with the transmission shaft, and the three-direction piezoelectric force sensor is installed inside the transmission shaft. The three-direction piezoelectric force sensor measures unsteady hydrodynamic force or unsteady aerodynamic force of the propeller in the longitudinal direction, the transverse direction and the vertical direction. The application adopts a force measuring disc with a thin plate configuration and a measuring rod with a rod configuration, decouples the radial excitation of the propeller and the longitudinal excitation, measures three-direction excitation force of the propeller installed at the front end of the transmission shaft through the piezoelectric force sensor, occupies a small space, and can directly measure the three-direction unsteady excitation force of the propeller in a complex environment.

The utility model provides a microphone and an electronic device, the microphone comprises a substrate and a chip body, the chip body is located above the substrate, and a first electrode layer on the chip body is connected with the substrate; a back polar plate assembly is arranged above the substrate, the back polar plate assembly comprises a supporting frame and is connected with a chip body through a connecting piece, and the chip body is located between the supporting frame and the substrate; a second electrode layer is arranged on one side, facing the chip body, of the supporting frame, a vibrating diaphragm is arranged at the top of the chip body, and variable capacitance is formed between the vibrating diaphragm and the second electrode layer; the supporting frame is provided with a plurality of sound hole sets, each sound hole set comprises a sound hole groove, and a plurality of strip-shaped sound holes are formed in the sound hole grooves. According to the microphone, the sound wave propagation path is changed through the multiple sound hole groups, standing waves are reduced, and high-frequency response is improved; the connecting piece realizes stable connection between the support frame and the chip body, and reduces vibration conduction at the same time.

The method for tuning the flat acoustic transducer by area comprises the following steps: defining a forward center tuning area corresponding to the middle area of the diaphragm and a forward periphery tuning area corresponding to the periphery area of the diaphragm on the front cavity end face of the flat acoustic transducer; applying one or more layers of superimposed and combined tuning materials with different air permeability and thickness in the forward center tuning area and the forward periphery tuning area respectively; defining a backward center tuning area corresponding to the middle area of the diaphragm and a backward periphery tuning area corresponding to the periphery area of the diaphragm on the rear cavity end face of the flat acoustic transducer; and applying one or more layers of superimposed and combined tuning materials with different air permeability and thickness in the backward center tuning area and the backward periphery tuning area respectively. The structure for tuning the flat acoustic transducer by area comprises a flat acoustic transducer, a forward tuning system constructed on the front cavity end cover of the flat acoustic transducer, and a backward tuning system constructed on the rear cavity end cover of the flat acoustic transducer.