36results about How to "Reduce resonance amplitude" patented technology

An internal combustion engine is disclosed which includes an improved crankcase drain back system. A set of drain flow diodes are disposed in each of the drain lines to direct fluid flow in a direction from the head portion to the crankcase. Likewise, a set of breather flow diodes are disposed in the breather lines to direct fluid flow in a second direction from the cylinder portion to the head portion. The flow diodes include a series of stacked flow diode elements which allow flow in one direction, while resisting flow in the opposite direction.

A ram air turbine assembly includes a preferentially located mass that modifies the resonance frequency of the assembly so that vibration is reduced to desired levels. The example mass can be fixed in a specific location on the ram air turbine or can be deployable once the ram air turbine is moved to an operating position.

The invention discloses a sound-absorbing large-damping self-resetting track mechanism, which adopts a C-shaped track body. The track body is injected with a two-color injection mold. The inside of the track body is inlaid with rubber materials. Dry friction occurs between the rail bodies. The bullet bears the extrusion force of the gear slot, and the internal spring is compressed accordingly. The extruded spring has the function of storing energy. When the external force is removed, the spring returns to its original state, and the whole mechanism is reset at the same time. The present invention adopts a structure with large damping to help reduce the resonance amplitude of the structure, and avoid mechanism damage caused by the vibration stress inside the structure; it helps the mechanism to quickly recover to a stable state after being subjected to an instantaneous impact; Acoustic radiation from mechanical vibrations. The present invention also realizes the shift form of the internal mechanism of the gear shifter, which is self-resetting. This mechanism is realized by the principle that the spring deforms under the action of the external force and returns to its original shape after the external force is removed.

The invention relates to a novel moon pool stabilization and wave absorbing wall which is arranged on the short side wall of a moon pool and comprises vertical stabilization and wave absorbing walls which are vertically arranged in front of the short side wall of the moon pool at certain intervals, and horizontal stabilization and wave absorbing walls which are horizontally arranged are arranged between the vertical stabilization and wave absorbing walls and the short side wall of the moon pool. A plurality of holes are respectively formed in the vertical stabilization and wave absorbing wallsand the horizontal stabilization and wave absorbing walls. Compared with the prior art, according to the design, moon pool resonance can be avoided more effectively, and a better wave absorbing and stabilizing effect is achieved; the two layers of vertically-arranged stabilization and wave absorbing walls can reduce slapping of transverse waves on a ship body to a greater extent, the three layersof horizontally-arranged stabilization and wave absorbing walls can slow down vertical movement of the moon pool, and finally the effects of stabilization and wave absorbing and ship body protectionare achieved.

The invention discloses an audio frequency playing method and device, and belongs to the computer technical field; the method is applied in electronic equipment having a hard disk and an audio frequency output device; the method comprises the following steps: obtaining audio frequency data frames to be played; reducing volume value of audio frequency data corresponding to a pre-stored interference frequency point in the audio frequency data frames, thus obtaining the audio frequency data frames after volume reduction process; playing the audio frequency according to the audio frequency data frames after the volume reduction process. The method and device can improve work stability of the hard disk in the electronic equipment.

The invention relates to a handheld sphygmomanometer with a shockproof structure. The sphygmomanometer is characterized by comprising an upper shell, a lower shell, an inner shell component, a valve component, an inflation component, a pressurized ball jacket, an airway structure and a shockproof mechanism, wherein the inner shell component is arranged between the upper shell and the lower shell, the shockproof mechanism is arranged between the inner shell component and the upper shell as well as between the inner shell component and the lower shell, the valve component is arranged on the lower portions of the shells and connected with the inflation component through a thread, a sealing ring is arranged between the valve component and the inflation component, and the valve component and the inner shell component are communicated by the airway structure arranged therebetween. The shockproof handheld sphygmomanometer is ingenious in integral structure design, and the shockproof goal is achieved well through a damping principle.

The invention discloses an eccentric block provided with a movable counterweight block. The eccentric block provided with the movable counterweight block comprises an eccentric block chassis, a movable counterweight block and a spring, wherein a similar involute rail for limiting the moving range of the movable counterweight block and supplying supporting force is arranged on the eccentric block chassis; the movable counterweight block is arranged in the similar involute rail and can reciprocate at a position close to the center of a main shaft and a position far away for the center of the main shaft along a route of a similar volute; a spring fixing seat is arranged on the eccentric block chassis; one end of the spring is connected to the movable counterweight block, and the other end ofthe spring is connected to the spring fixing seat. The eccentric block provided with the movable counterweight block is applicable to a vibrator and a vibration screen, and is small in rigidity and compression strength of the supplied spring; the structure is compact; the resonant vibration range of the vibrating screen is reduced while the vibrating screen moves through a resonance area during being started and stopped, and the dynamic load over the ground is reduced; surrounding components cannot be impacted due to wide vibration range, and a screening machine body is prevented from adverseinfluence.

The invention provides a vibration screen damping support. The support comprises a machine body; the machine body comprises a hydraulic cavity; the hydraulic cavity contains hydraulic oil; a rubber piston is arranged inside the hydraulic cavity above the hydraulic oil; a push rod is arranged on the rubber piston; a rubber sealing lining is arranged at the top of the hydraulic cavity; and a first open groove is formed in the rubber sealing lining. The vibration screen damping support has the beneficial effects that: the structure of equipment is simple and operation is simple and convenient; shock of the equipment in the vertical direction can be reduced via action of the hydraulic cavity; high temperature of the hydraulic cavity caused by reciprocating motion is lowered via circulation ofcooling liquid; connecting rod mechanisms on the left side and the right side of the machine body are matched with air bags, so resonance amplitude of a vibration screen caused during initiation and shutdown is lower; and in an extreme status, the air bags below the machine body enable the machine body to sway, so damage to a hydraulic push rod is avoided. The matching is tight, and the integration degree is relatively high.

The invention belongs to the technical field of automobile power steering gears, and particularly relates to an automobile hydraulic power steering gear control valve damping noise reduction structure and a damping noise reduction method thereof. The structure comprises a steering screw, a valve sleeve and a valve element assembly, the valve element assembly is inserted into a center hole of the steering screw, one end of the valve element assembly is connected with the steering screw, the valve sleeve is arranged at the other end of the valve element assembly in a sleeving mode and connected with the valve element assembly in a positioning mode, the outer surface of the valve sleeve is in running fit with the steering screw, a damping ring groove is formed in the valve sleeve, and a damping ring is contained in the damping ring groove. The damping ring groove is communicated with a high-pressure oil groove in the valve sleeve through an oil guide groove. The resonance amplitude of the steering control valve of the automobile hydraulic power steering gear is reduced, the abnormal sound frequency is reduced, and the assembly qualification rate is increased.

The invention relates to a method for preparing a water sound absorption polymer composite material and belongs to the technical field of ships. According to the method, the water sound absorption polymer composite material is prepared from modified nano zinc oxide and glycerol, because of modification of vinyl triethoxy silicon, nano zinc oxide has a great amount of hydroxyl on the surface, the glycerol and the modified nano zinc oxide with the hydroxyl are uniformly dispersed into a substrate, polar functional groups of polymer macromolecules, and the hydroxyl non the surface of the glyceroland the nano zinc oxide form a hydrogen bond network structure penetrating through the substrate, the hydrogen bond network structure is easily damaged and reformed under the action of an external force field and a temperature field, then a great deal of energy can be absorbed, very high mechanical consumption can be resulted, energy in sound waves can be effectively absorbed, and the water soundabsorption effect of a material can be improved.

The invention discloses a shockproof off-ground type high-voltage switch cabinet mechanism. The mechanism comprises a bottom plate, the upper end of the bottom plate is fixedly connected with a shockproof layer; the top end of the shockproof layer is fixedly connected with a supporting plate; a first hydraulic cylinder is arranged on the supporting plate; a second hydraulic cylinder is arranged atthe corresponding position of the right side of the first hydraulic cylinder, a third hydraulic cylinder is arranged at the corresponding position of the rear side of the second hydraulic cylinder; afourth hydraulic cylinder is arranged at the corresponding position of the left side of the third hydraulic cylinder, a piston rod is arranged at the top end of the first hydraulic cylinder, a case is fixedly connected to the top end of the piston rod, the four corners of the case are fixedly connected to one ends of connecting rods, and the other ends of the connecting rods are fixedly connectedto telescopic rods. According to the cabinet mechanism, the shockproof effect of the whole mechanism is achieved by arranging the shockproof layer, a computer case can be lifted to a proper positionby arranging the hydraulic cylinder, ground moisture corrosion is prevented by arranging a ground-off mode, meanwhile, bottom surface heat dissipation is improved, and the computer case is worthy of vigorous popularization.

The invention discloses a durable hinge, and relates to the field of hinges. The durable hinge comprises an upper shell, a lower shell and a positioning block, wherein the upper shell and the lower shell are detachably connected, and the positioning block is arranged between the upper shell and the lower shell; a cavity is formed in the positioning block, a buffer mechanism and a driven rotating mechanism connected with a door are arranged in the cavity, the buffer mechanism is used for reducing the rotating speed of the driven rotating mechanism, a liquid loop is further arranged in the buffer mechanism, and the liquid loop is used for improving the rotating stability of the driven rotating mechanism. According to the durable hinge, the driven rotating mechanism is arranged to drive the buffer mechanism to move, so that the resistance of a buffer block, a sliding block and a spring needs to be overcome when the door rotates, then the speed is reduced, and the impact on the door and a door frame is reduced; and the liquid loop is arranged in the buffer mechanism, so that the resonance amplitude of each mechanical element in the device is reduced while the speed is further reduced, the rotating stability of the driven rotating mechanism is improved, the damage of the mechanical elements is reduced, and the service life of the device is prolonged.