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

The invention discloses a high-frequency air inlet flow field rectification and heat dissipating structure of a server case, comprising a fan frame arranged on the case, a plurality of heat dissipation fans arranged on the fan frame, and a waveguide plate arranged on the fan frame and located on the air inlet side of each heat dissipation fan for rectifying the air inlet turbulence to form laminarflow. Thus, after the waveguide plate rectifies the inlet air flow, the inlet air turbulence generated by the heat dissipation fan in the process of high-speed rotation will be rectified to form laminar flow, so that the inlet air flow can uniformly and orderly pass through the fan frame and enter into the inside of the server case to dissipate heat for the hard disk and other components. As theinlet air turbulence is rectified to form laminar flow, the high-frequency vibration of the inlet air flow field is greatly reduced, the airflow is more uniform and smooth, and the airflow fluctuationis low. When the heat dissipation is carried out on the hard disk, the vibration influence on the hard disk can be reduced, the read and write efficiency of the hard disk can be improved, and errorsin data read and write can be avoided. The invention also discloses a server case, the beneficial effect of which is described above.

The invention discloses a motor for a ship and a vibration and noise reduction method thereof. A three-phase asynchronous motor for the exiting ship is improved from two aspects of reducing the electromagnetic exciting force and preventing the superposition of the frequency of the electromagnetic exciting force with the inherent frequency of a motor stator core, so that the low-frequency vibration generated by the electromagnetic exciting force is maximally avoided or weakened, and the high-frequency vibration is reduced. According to a principle that if the underground vibration frequency is lower, the vibration transmissibility is stronger, the low-frequency vibration acceleration level and the total vibration level of the three-phase asynchronous motor for the exiting ship can be greatly reduced, so that the mute ability of the ship is improved, and the distance of the ship discovered by sonar equipment is reduced.

The invention discloses a device and method capable of reducing the oscillator accelerated speed effect, and aims at providing a device and method for reducing the accelerated speed effect through the cooperation of mechanical compensation and real-time compensation. The device is composed of an oscillator, an accelerated speed sensor, an accelerated speed compensation circuit, an elastic support and a metal shell. The elastic support is a supporting piece which has the elasticity, can generate deformation under the 0-100 g accelerated speed condition, and can achieve self recovery. The method is characterized in that high-frequency vibration is reduced through the elastic support, the offset voltage is generated in real time through the accelerated speed compensation circuit to be applied to the oscillator, and frequency changes caused by low-frequency vibration are offset. By means of the device and method, influences of 2-2 KHz vibration on the output performance of the oscillator can be effectively reduced, and the oscillator accelerated speed effect can be better reduced.

The invention provides a transmission system torsional vibration reducing method and application thereof. The method is characterized in that a torsional vibration damper, which is a tuned rotary inertia damper, is added on a transmission shaft in a parallel connection manner, and the torsional rotation movement around the transmission shaft is used for reducing the vibration level of a certain first order torsional mode frequency. The method is flexible, can effectively reduce vibration without damage to the original structure of the transmission system, and can be used for later repair of the transmission system. The method can be applied to wind energy/tidal current energy generator sets; the torsional vibration damper is installed on a shaft, connected with a generator, of a high speed shaft coupler to greatly reduce a first-order mode component in the torsional vibration, so that a transmission system can operate more stably, the reliability of the structure can be improved and the service life can be prolonged.

The invention discloses an IMU shock absorption and heat insulation device based on silica gel and a preparation method, and belongs to the field of inertial navigation systems. The IMU shock absorption and heat insulation device can reduce high-frequency vibration and relieve the influence of temperature change on an IMU. The IMU shock absorption and heat insulation device comprises a pressing plate, a silica gel shock absorption and heat insulation body, an IMU sensor, a flat cable, a printed circuit board and a bottom plate, wherein the flat cable is connected with the printed circuit board; the printed circuit board is connected with the IMU sensor; the IMU sensor and the printed circuit board are wrapped in the silica gel shock absorption and heat insulation body; the pressing plate is arranged at the top of the silica gel shock absorption and heat insulation body; the silica gel shock absorption and heat insulation body is fixed to the bottom plate; and the bottom plate is connected with the pressing plate. The IMU shock absorption and heat insulation device is simple and compact in structure, convenient and fast to mount, high in production efficiency, low in material cost and good in shock absorption and heat insulation effect.

The invention discloses a ballastless track plate structure for realizing broadband vibration attenuation based on a photonic crystal principle. The structure comprises a ballastless track plate vibration attenuation structure consisting of three parts of a periodic steel column vibration attenuation device, a periodic rubber column vibration attenuation device and a track plate which are repeatedly arranged along the direction of a line. The periodic steel column vibration attenuation device and the periodic rubber column vibration attenuation device are both located in the track plate belowa track position, and the periodic rubber column vibration attenuation device is arranged below the periodic steel column vibration attenuation device and distributed side by side in parallel. The periodically-arranged steel columns are good in high-frequency vibration attenuation, the periodically-arranged rubber columns are good in low-frequency vibration attenuation, rubber can attenuate high-frequency vibration to a certain extent due to a damping effect of the rubber, and overall vibration of the track structure is greatly reduced through combination of the two.

The invention belongs to the technical field of civil engineering structure vibration damping and provides a frequency continuously adjustable mass damper. The frequency continuously adjustable mass damper is mainly composed of stand columns, a weight box, weight steel plates, a cross beam, a bottom plate, pressing plates and the like. The frequency continuously adjustable mass damper is suitable for controlling high-frequency vibration in large-span sky bridges, port piers and large-span building structures. Compared with a traditional tuned mass damper, the cross beam is adopted to replace springs to provide rigidity of a damping system and reduce the high-frequency vibration. The stand columns are connected with the bottom plate and the pressing plates in a clamping mode, the mounting positions of the stand columns can be adjusted in the length direction of the cross beam, and then the span of the cross beam can be changed. The frequency of the damping system can be continuously adjusted by adjusting the span of the cross beam. The weight steel plates are vertically assembled and connected so that the mounting space can be reduced; meanwhile, the frequency of the damping system can be slightly adjusted by changing the number of the weight steel plates.

The invention discloses a damper type floating slab track. The damper type floating slab track comprises a shear hinge for connecting a track slab with another track slab, and a spring-viscous damperassembly which is arranged below a steel rail, is arranged in a floating slab and is used for reducing vibration. The damper type floating slab track has the advantages that the spring-viscous damperreplaces a traditional steel spring to serve as a vibration isolation element, parameters of the elastic element are reasonably matched, high-frequency vibration is effectively restrained, low-frequency resonance energy of the track slabs is absorbed, the defect that a steel spring floating plate track restrains low-frequency vibration is overcome, and the vibration isolation frequency range of the floating slab track is expanded; and the damper assembly is convenient to mount, dismount and overhaul and maintain in the later period; and the damper converts kinetic energy to thermal energy fordissipation, is simple in structure and stable in motion when doing reciprocating motion.

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.

The invention discloses a lightweight rear suspension structure applied to electric automobiles. The lightweight rear suspension structure comprises a monolithic-leaf plate spring made of a compositematerial, wherein the front end of the monolithic-leaf plate spring is connected with a front spring eye; the rear end of the monolithic-leaf plate spring is connected with a rear spring eye; the middle part of the monolithic-leaf plate spring is located in a rear axle plate spring seat; the middle part of the monolithic-leaf plate spring is equipped with a backing plate frame and two U-shaped bolts; the two U-shaped bolts are connected to the backing plate frame through nuts; the backing plate frame is clung to the bottom of the rear axle plate spring seat; the backing plate frame, the monolithic-leaf plate spring and the rear axle plate spring seat are fixedly connected with each other through rivet heads; the backing plate frame is articulated with a damper; the upper end of the damperis connected to an automobile body longitudinal beam. Compared with the existing rear suspension, which adopts (3 plus 2)-leaf two-stage stiffness springs, the lightweight rear suspension structure only adopts one monolithic-leaf plate spring made of the composite material, so that the mounting requirement is simplified; the weight of the monolithic-leaf plate spring is only 1/3 of the weight of the original steel plate spring; the inner damping resistance among leaves does not exist in the monolithic-leaf plate spring; the stiffness change is more linear; and the driver and the passengers feel more comfortable.

The invention relates to an intelligent active control type high-pressure pipeline pressure pulsation damping device and method. The device comprises an input pressure sensor, a signal conditioning unit, an A/D module, an output pressure sensor, a control unit, a D/A module and an intelligent active control type high-pressure pipeline pressure pulsation damping device body. The signal conditioning unit comprises a first signal conditioning unit and a second signal conditioning unit; the A/D module comprises a first A/D module and a second A/D module; the output end of the first signal conditioning unit is connected with the input end of the first A/D module; the output end of the first A/D module is connected with the input end of the control unit; the output end of the second signal conditioning unit is connected with the input end of the second A/D module; the output end of the second A/D module is connected with the input end of the control unit; the output end of the control unit is connected with the input end of the D/A module; the output end of the D/A module is connected with the intelligent active control type high-pressure pipeline pressure pulsation damping device body; and the intelligent active control type high-pressure pipeline pressure pulsation damping device body comprises a high-pressure pipeline and a ring type piezoelectric stack actuating unit.

The invention discloses a self-adaptive shockproof designed packaging transportation device, and belongs to the technical field of transportation equipment. The self-adaptive shockproof designed packaging transportation device comprises an outer box body mounted on a transport vehicle, a truss fixedly connected to the inner wall of the outer box body, an inner box body arranged in the outer box body and a plurality of groups of energy dissipaters; one ends of every two energy dissipaters are jointly hinged to the truss, the other ends of the two energy dissipaters are hinged to different positions of the side wall of the inner box body respectively, each energy dissipater comprises a sleeve, a piston rod, a first piston head, a second piston head, an upper cylinder sleeve, a lower cylinder sleeve and a fixed partition plate, and the lower cylinder sleeve is slidably connected with a rotating partition plate; and the rotating partition plate is provided with a first connecting column and a second oil through hole, a spiral groove is formed in the inner wall of the sleeve, and an opening groove is formed between the upper cylinder sleeve and the lower cylinder sleeve. The self-adaptive shockproof designed packaging transportation device is provided with the energy dissipaters, the buffering effect can be achieved, and the purposes of rapidly attenuating vibration and reducing the amplitude of vibration can be achieved.