49results about How to "Reduce high frequency vibration" patented technology

The invention discloses a damper-type floating plate track, a shear hinge connecting the track plate with another track plate, and a spring for damping vibration arranged under the steel rail and inside the floating plate. Viscous Damper Assembly. The advantage of the present invention is that the traditional steel spring is replaced by a spring-viscous damper as the vibration isolation element, and the parameters of the elastic element are reasonably matched, which not only effectively suppresses the high-frequency vibration, but also absorbs the low-frequency resonance energy of the track plate. It makes up for the deficiency of the steel spring floating plate track in suppressing low-frequency vibration, and expands the vibration isolation frequency range of the floating plate track. The damper assembly is easy to install, disassemble, and for later maintenance. The damper converts kinetic energy into heat energy and dissipates it. Its structure is relatively simple, and the movement is stable when reciprocating.

The invention discloses a silica gel-based IMU shock-absorbing and heat-insulating device and a preparation method thereof, which belong to the field of inertial navigation systems and can reduce the impact of high-frequency vibrations and temperature changes on the IMU. The IMU shock-absorbing and heat-insulating device includes: a pressure plate, a silicone shock-absorbing heat insulator, an IMU sensor, a cable, a printed circuit board, a bottom plate, the cable is connected to the printed circuit board, the printed circuit board is connected to the IMU sensor, and the IMU sensor is connected to the printed circuit The plate is wrapped in the silica gel shock-absorbing and heat-insulating body, the pressure plate is placed on the top of the silica gel shock-absorbing and heat-insulating body, the silica gel shock-absorbing and heat-insulating body is fixed on the bottom plate, and the bottom plate is connected with the pressure plate. The invention has the advantages of simple and compact structure, convenient and fast installation, high production efficiency, low material cost and good shock absorption and heat insulation effect.

The invention discloses a piezoelectric self-sensing based adjustable damper. The piezoelectric self-sensing based adjustable damper comprises an upper lifting lug, a dustproof cover, a piston rod, a guide seat assembly, a working cylinder barrel, a working piston assembly, a seal ring, a floating piston, a closed air chamber and a lower lifting lug, wherein the working piston assembly comprises a compression block, a limiting block, a limiting rod, a piezoelectric valve plate, a piston, a flow valve, a piston packing ring, a rebound valve, a preset normal open hole and a compression nut; the piezoelectric valve plate is formed by connecting a plurality of piezoelectric displacement units in series; each piezoelectric displacement unit is composed of a piezoelectric material stack layer and a displacement enlargement mechanism. The piezoelectric valve plate generates induced charge under the action of oil pressure, extracts induced voltage and exerts control voltage via a bridge circuit to change the size of the valve plate so that the size of a throttling area changes and a damping coefficient is adjustable. Based on the piezoelectric self-sensing effect, a sensor and an actuator are integrated on the same valve plate, the piezoelectric self-sensing based adjustable damper is simplified in structure, stable to control and high in dynamic response speed, and the capacity coupling is avoided.

The invention relates to a system and method for retraining high-frequency vibration of a low-pressure large-power multi-phase variable frequency motor. Due to the fact that a variable frequency power supply output impulse sequence is optimized, by means of a magnetic field coupling relationship in the motor, electromagnetic exciting force causing the high-frequency vibration is reduced, and the purpose of retraining the high-frequency vibration of the motor is achieved. The method for retraining the high-frequency vibration of the low-pressure large-power multi-phase variable frequency motor can effectively reduce the high-frequency vibration of the motor, reduces noise, and is suitable for the fields of large-power industrial electric transmission, rail transit, ship electric propulsion and the like.

The invention discloses a low-noise range hood, which comprises a volute, wherein an impeller is arranged inside the volute, a first annular air duct is arranged at the bottom of the volute, and a second annular air duct is arranged above the first annular air duct; a plurality of first partition plates are arranged in the first annular air duct, a spheroidal air bag is movably connected between the two adjacent first partition plates, a plurality of first through holes are evenly formed in the first partition plates, a second partition plate is arranged at the air inlet of the first annular air duct, a plurality of second through holes are evenly formed in the second partition plate, and a first air deflector is obliquely arranged between the second partition plate and the first partition plate adjacent to the second partition plate; a third partition plate is arranged at the air inlet of the second annular air duct, a third through hole is formed in the third partition plate and is communicated with an air inlet end of a cavity, and an air outlet end of the cavity is communicated with the second annular air duct. According to the low-noise range hood, the deficiencies of the prior art can be improved, and the efficient noise reduction at different air volumes can be realized.