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59results about How to "Reduce resonance phenomenon" patented technology
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Passive control system and method for improved LCL type three-phase VSR based on IDA-PBC algorithm
InactiveCN109639162AImprove stabilityGood control effectAc-dc conversionMathematical modelSwitching frequency
The invention relates to a passive control system and method for an improved LCL type three-phase VSR based on an IDA-PBC algorithm. According to the method of the invention, an LCL filter is used toreplace the traditional L filter, the three-phase voltage of a grid side is collected through a voltage signal acquisition sensor, the three-phase current of a rectification side is collected througha current signal acquisition sensor, and coordinate axis voltage and current are calculated according to the coordinate transformation. A dissipative Hamiltonian mathematical model with a controlled port is constructed according to the coordinate axis voltage and current, damping injection is performed, and improved parameters are added. A controller module obtains a voltage control signal throughtransformation according to a d-axis switching function and a q-axis switching function, a rectifier bridge power switching tube is controlled according to a space vector pulse width modulation algorithm, and alternating current outputted by an alternating current power module is rectified into direct current. According to the invention, the response speed of the system is quick at a low switching frequency, the harmonic content is effectively reduced, and at the same time, the stability of the system is improved.
Owner:WUHAN UNIV OF SCI & TECH
Oil-free piston compressor of medical vaporizer
ActiveCN103195686AEliminate vibrationEliminate frequencyPositive displacement pump componentsPositive-displacement liquid enginesResonanceOil free
The invention provides an oil-free piston compressor of a medical vaporizer. The oil-free piston compressor comprises a crankshaft, an air cylinder, a piston, a connection rod, an air cavity and an air valve, wherein the crankshaft and the air cylinder are connected with an output shaft of a motor, the piston is mounted in the air cylinder in an inserted manner, the crankshaft and the piston are connected via the connection rod, the air cavity is fixed on an end portion of the air cylinder, the air valve is arranged between the air cavity and the air cylinder, the air cylinder is provided with an air inlet and an air outlet, and the air inlet comprises an extension portion fixed inside the air cavity. The air inlet is provided with the extension portion in the air cavity, overlap between vibration generated due to airflow flows into the air cavity from the air inlet and intrinsic frequency of the oil-free piston compressor, sound resonance phenomenon is reduced, and noise is greatly lowered.
Owner:沈良进
Mounting structure for bottom supports of washing machine
InactiveCN1966822AHigh strengthEasy to assembleOther washing machinesTextiles and paperResonanceMechanical engineering
The installation structure of the feet of the washing machine comprises a base under the housing, a bracket on the base, a feet assembly made of more than one foot on the bracket, and a step holding installation section for installing feet. It can also comprise housing, a bracket under the housing, the feet assembly made of more than one foot on the bracket. All of them join together at the bottom of the bracket to form the base of the bottom of the washing machine. It can improve the intensity of the bracket and reduce the resonance caused by the washing machine. It also improves assembly performance with stable support. At the bottom of the housing, sets a bracket with several feet, a base under the bracket. It adds the thickness of the installation sector, improves its intensity, and ensures the flexibility of the design with easily adjusted thickness of the bracket.
Owner:LG ELECTRONICS (TIANJIN) APPLIANCES CO LTD
Electric chain saw assembly
ActiveCN113580273AFew partsSimple structureMetal sawing devicesMetal sawing accessoriesStructural engineeringKnife blades
The invention discloses an electric chain saw assembly. The electric chain saw assembly comprises a saw chain and a guide plate; the saw chain is arranged around the edge of the guide plate; the saw chain comprises transmission chain pieces and connecting pieces which are sequentially and rotatably connected end to end; a tooth cutting structure is arranged at the top end of each transmission chain sheet; each cutting tooth structure comprises a cutting edge and limiting teeth; the limiting teeth are located at the front end of the saw chain in the advancing direction; the cutting edges are located at the rear end of the saw chain in the advancing direction; and a chipping groove is formed between each cutting edge and the corresponding limiting teeth. According to the electric chain saw assembly, on one hand, the cutting teeth and the transmission chain pieces are combined into the integrated structure; the arrangement mode of the cutting teeth is improved; the structure is simple; assembling is convenient; the problem that the blades are bent or deviated due to resonance can be effectively solved; on the other hand, lubricating oil is prevented from splashing by improving a guide plate; and cyclic utilization of the lubricating oil is achieved while it is guaranteed that the saw chain rotates smoothly.
Owner:杭州精锋园林工具有限公司
Single-degree-of-freedom passive non-contact vertical type eddy current magnetic damping generator
ActiveCN107542822AExtended use timeReduce maintenance costsMagnetic springsElectrical conductorMagnetic damping
The invention discloses a single-degree-of-freedom passive non-contact vertical type eddy current magnetic damping generator. The single-degree-of-freedom passive non-contact vertical type eddy current magnetic damping generator comprises a main shaft, a guide shaft, an upper top board, an upper end cover, a lower end cover and a lower bottom board, wherein the upper top board, the upper end cover, the lower end cover and the lower bottom board are sequentially arranged up and down; the main shaft is fixedly connected with the lower bottom board and sequentially penetrates through the lower end cover and the upper end cover; the main shaft is sleeved with a conductor pipe; the conductor pipe is fixedly connected with the upper end cover and the lower end cover; a permanent magnet is arranged between the conductor pipe and the main shaft; a gas gap is formed between the conductor pipe and the permanent magnet; and the upper end and the lower end of the permanent magnet are fixed to themain shaft. The single-degree-of-freedom passive non-contact vertical type eddy current magnetic damping generator is an independent modular device capable of providing damping, during usage, only thelower bottom board of the device is fixedly connected with a base, the upper top board of the device is fixedly connected with a vibrating body through a top board, and at the moment, when the vibrating body and the base move relatively, the device can generate the damping effect.
Owner:SHANGHAI UNIV
Ultrathin power-driven woofer
InactiveCN102143417AImprove bass qualityIncrease heightFrequency/directions obtaining arrangementsEngineeringWoofer
The invention relates to an ultrathin power-driven woofer. The main technical key points of the woofer are as follows: a sound cone bottom is fixedly connected with a printed circuit board (PCB) in which an electronic wire harness is built; a lead wire is fixedly adhered to a conical cone; the tail end of the lead wire penetrates into a welding hole to be fixedly welded with the electronic wire harness in the PCB; the length of the lead wire in a woofer is more than the distance between a small hole and the welding hole, so that the lead wire in the woofer is of a bent shape; the conical cone comprises a first cone component and a second cone component; the first cone component is of an arced shape and the lowest section of the first cone component is a cylinder; the second cone component is elevated in sequence from inside to outside and adhered to the cylinder of the first cone component by glues; the highest point of the first cone component is connected with a voice coil skeleton; and a paper cone is provided with a height increasing block, and the height increasing block and the paper cone are integrated into a whole, thus increasing the height of the paper cone. The whole thickness of the woofer is not more than 20mm, and the woofer is good in tone quality.
Owner:葛锦明
Improved passive control system and method based on LCL filtering grid-connected inverter under complex power grid impedance
InactiveCN112260279ACapacitive current increasesPassiveAc-dc conversionSingle network parallel feeding arrangementsGrid impedanceHemt circuits
The invention discloses an improved passive control system based on an LCL filtering grid-connected inverter under complex power grid impedance. The improved passive control system comprises an alternating current power supply module, a voltage signal acquisition sensor, a phase-locked loop, a current signal acquisition sensor, a passive controller, an inverter, a direct current power supply and an LCL filter. The method for controlling by using the improved passive control system based on the LCL filtering grid-connected inverter under the complex power grid impedance comprises the followingsteps: (1) establishing a circuit model; (2) carrying out coordinate transformation; (3) establishing an Euler-Lagrange passive system model; (4) defining a reference variable and an error amount; (5)injecting damping; (6) calculating a control rate; (7) establishing a system admittance model; (8) solving the output admittance of an inverter; (9) determining a damping r1 range; and (10) broadening a passive region. The method has the advantages of effectively reducing the resonance phenomenon, improving the system stability and robustness and the like.
Owner:SHANGHAI MARITIME UNIVERSITY
Aluminum alloy decoration wallboard for separated-from-wall shock absorption
ActiveCN105625662AReduce resonance phenomenonKeep quietCovering/liningsFlooringLiving roomAluminium alloy
The invention discloses an aluminum alloy decoration wallboard for separated-from-wall shock absorption.The aluminum alloy decoration wallboard comprises a soft package shock absorption decoration structure and a separated-from-wall shock absorption structure.The soft package shock absorption decoration structure comprises an installation groove, a decoration soft package, a shock absorption frame, a shock absorption bottom plate and a collection bottom plate.The separated-from-wall structure comprises a wallboard structure, a wallboard frame structure and a shock absorption strip structure.The structure of the aluminum alloy decoration wallboard can be more reasonable, the advantages of the aluminum alloy decoration wallboard are ensured, noise generated when aluminum wallboards collide is effectively reduced, and the sound insulation effect is good; meanwhile, the appearance of the aluminum alloy decoration wallboard can be more attractive, harmonious and diverse, influences caused when a wall body is not right opposite to the installation structure in the installation of the aluminum alloy decoration wallboard can be avoided, the resonance phenomenon of the aluminum alloy decoration wallboard can be reduced, it is ensured that a living room is quite and attractive, and the aluminum alloy decoration wallboard is simple in structure, convenient to install and beneficial to decoration application of homes.
Owner:HAIYAN MDHO ELECTRICAL APPLIANCE TECH
Robot conveying hanging bracket
ActiveCN108483222AAvoid shakingReduce resonance phenomenonNon-rotating vibration suppressionLoad-engaging elementsResonanceSteel frame
The invention discloses a robot conveying hanging bracket. The robot conveying hanging bracket comprises a square steel frame and a steel rope hanging cable. Grooves are formed in the plate surface ofthe square steel frame. A damper is mounted at the bottom of each groove. A screw rod is mounted in the middle of each groove. A first connecting piece is mounted on each screw rod in a sliding manner. The connecting end of each first connecting piece extends out of the corresponding groove. A connecting head is mounted on a piston rod at one end of each damper. The upper end of each connecting head is fixedly connected with the bottom of the corresponding first connecting piece. A vibration reduction mechanism is further arranged on the plate surface of the square steel frame. According to the robot conveying hanging bracket, force borne by the steel rope hanging cable is counteracted through deformation of vibration reduction springs, and thus the resonance phenomenon of the steel ropehanging cable is reduced; power for pushing second connecting pieces to move is consumed through the dampers, so that the vibration damping purpose is achieved, and thus stability of the hanging bracket is further improved; and the hanging bracket is in the steady state, and robot hoisting stability is guaranteed.
Owner:WUHU YIZE SMALL & MEDIUM ENTERPRISE PUBLIC SERVICE CO LTD
Polymer damping device
InactiveCN102127936AEliminate havocAvoid resonance phenomenonShock proofingEnergy transferPolymer concrete
The invention relates to a damping device, in particular to a damping device made of a polymer damping material. The conventional damping device reduces vibration energy transferred from a foundation of a building through sliding between damping pads made of rubber or metal, so that vibration intensity is reduced to reduce the damage degree of the building; however, the rubber has the defects that the rubber is easy to age and the like, and the common rubber support does not have damping energy dissipation capability, so that a damper is needed to be arranged additionally. The technical scheme is that: the polymer damping device comprises a top plate fixedly connected with the building, a bottom plate fixedly connected with the foundation, and a friction block between the top plate and the bottom plate, wherein the friction block is made of a high damping material, preferably a polymer material; and the bottom plate and the top plate are made of polymer concrete and are fixedly connected through a foundation bolt or a fixing steel bar. The damping device has a scientific, reasonable and simple structure, low manufacturing cost and high practicability, and is safe and reliable.
Owner:黄鑫东 +1
Multi-maneuvering-mode mobile intelligent robot
The invention discloses a multi-maneuvering-mode mobile intelligent robot and relates to the technical field of intelligent robots, in particular to a multi-maneuvering-mode mobile intelligent robot.The multi-maneuvering-mode mobile intelligent robot comprises a buffering base and a stable supporting structure, wherein a hydraulic lifting structure is arranged below the buffering base; and the stable supporting structure comprises a supporting platform, a damping buffering column, a damping spring and a piston column, the damping spring is arranged in the lower end of the damping buffering column, and a power transmission structure is arranged below the stable supporting structure. According to the intelligent robot capable of being moved stably and with a carrying function, the structureis increased, the usability of the whole device is improved, the improved equipment has good buffering and damping capacity in the using process, the resonance phenomenon occurring in the moving process of the equipment is reduced as much as possible, the stability degree of carried articles is improved, the display of the equipment and the articles due to unstable gravity center can be avoided,and the use requirements of people can be effectively met.
Owner:DONGGUAN UNIV OF TECH
a leaf blower
Owner:NINGBO KINGBIRD POWER TOOLS
Piezoelectric plane horn
InactiveCN102625215AAdjust vibration behaviorReduce resonance phenomenonElectrical transducersResonancePiezoelectric actuators
The invention discloses a piezoelectric plane horn, comprising a framework, a piezoelectric actuator, and a vibration generating membrane arranged in the transparent assembling space of the framework, wherein two opposite sides of the vibration generating membrane are fixed to the piezoelectric actuator, with the other two sides thereof forming a spacing relationship with the framework; the piezoelectric actuator formed by utilizing a bimodal piezoelectric piece is fixed at two sides of the vibration generating membrane; the vibration generating membrane is made to generate the voice of high pitch voltage via the high deformation of a bimodal piezoelectric piece; the bimodal piezoelectric piece in the piezoelectric actuator can be independently driven by the drive circuit to cooperate with the phase control of different bimodal piezoelectric piece drive voltage, thus to adjust the vibration movement of the vibration generating membrane and reduce the resonance phenomenon of the vibration generating membrane, thereby making the vibration generating membrane produce relatively flat acoustic frequency response. The piezoelectric plane horn is applicable to sound equipment, TV, computer, and other electronic devices and is located in a preset installing space of the electronic device by utilizing the framework thereof.
Owner:HO HSIN PROGRESSIVE TECH
Central pipe provided with grid mesh and serving as draft pipe of vortex suppression device
InactiveCN111927673AReduce intensityVelocity loop decreasesHydro energy generationReaction enginesMixed flowWater turbine
The invention discloses a mixed flow water turbine central pipe provided with a grid mesh and serving as a draft pipe of a vortex suppression device. The central pipe comprises a right cone cylinder;a cylindrical central pipe is coaxially arranged in the right cone cylinder; six flat plates perpendicularly arranged are connected into the central pipe and are divided into two groups; each group comprises three flat plates; the three flat plates in each group are arranged at intervals in parallel; the three flat plates of the first group are perpendicularly connected with the three flat platesof the second group; the middle flat plate of three flat plates in each group is arranged in the diameter direction of the central pipe; the other two flat plates of three flat plates in each group are positioned on the two sides of the middle flat plate in the same group; the two ends of the six flat plates are fixedly connected with the inner wall of the central pipe; the six flat plates dividethe cavity of the central pipe into a grid mesh structure; and when water flows out of the outlet of a runner and flows into the central pipe, a vortex strip is damaged, the velocity circulation is reduced, and water flow rotation at the center causes negative pressure reduction, so that the strength of the velocity circulation is lowered to weaken pressure pulsation.
Owner:JIANGSU UNIV
Vehicle body structure and method for improving outside corridor locomotive modal frequency
InactiveCN105197030AImprove stabilityImprove torsion resistanceAxle-box lubricationRailway bodiesBogieResonance
The invention discloses a vehicle body structure and method for improving the outside corridor locomotive modal frequency. The vehicle body structure comprises a vehicle body and a side wall frame. The side wall frame is welded and fixed to the vehicle body. The side wall frame sequentially comprises a storage battery chamber frame body, an electrical chamber frame body and a power chamber frame body from left to right. A crossed inclined supporting structure is installed on the storage battery chamber frame body and the power chamber frame body. The vehicle body structure is simple in structure and reasonable in design, and the stability and torsion resistance of the vehicle body can be effectively enhanced; by means of the vehicle body structure, the locomotive body first-order vertical bending modal frequency is improved by 41.5% and is improved from 4.79 Hz to 6.78 Hz, the bogie nodding frequency of 5 Hz is completely avoided, and the probability of locomotive resonance phenomenon is greatly decreased; the crossed inclined supporting structure is easy to detach, and locomotive facility installation and maintenance are facilitated.
Owner:CRRC ZIYANG CO LTD
Multi-nozzle alcohol-based burner
PendingCN110425523ARun completelyGuaranteed uptimeAir supply regulationLiquid fuel burnerCycloneAlcohol
The invention discloses a multi-nozzle alcohol-based burner. The device comprises an air duct outer pipe and a multi-sage fuel supply unit, wherein multi-stage air duct pipes are coaxially arranged inside the air duct outer pipe in sequence; the air duct pipe located at the most center is a first-stage air duct pipe; the outside of the first-stage air duct pipe is sleeved with a second-stage air duct pipe; an ignition device, an air duct cyclone and an annular air distributor are arranged at the inlet of the first-stage air duct pipe; a central nozzle is arranged in the inner ring of the air duct cyclone; and the central nozzle is connected with a central branch pipe; the fuel supply units respectively communicate with a plurality of annular branch pipes; and the plurality of annular branch pipes are parallel to the center line of the multi-stage air duct pipes and are circumferentially arranged around the outer side of the second-stage air duct pipe. According to the multi-stage zonedcombustion technology, a rich combustion zone and a quenching zone are formed in the first-stage air duct pipe, and a lean combustion zone is formed at the outlet of the first-stage air duct pipe, sothat atomized liquid and combustion air are fully mixed; combustion is complete, and nitrogen oxide emission is reduced; and variable load regulation of the burner is achieved using the multi-stage fuel supply unit.
Owner:XIAN AEROSPACE SOURCE POWER ENG CO LTD
Active power filter parallel operation active damping method
ActiveCN106602562AEffective dampingConstant damping effectActive power filteringAc network to reduce harmonics/ripplesPower gridActive power filter
The invention relates to an active power filter parallel operation active damping method. The method includes the following steps of: output current secondary quadratic differential calculation: the actual output current values of the first two control periods are recorded, when a current control period starts, the actual output current value of the current control period is read, and the quadratic differential value of output current is calculated based on the actual output current value and the output current values of the first two control periods; and adaptive damping coefficient calculation: an adaptive damping coefficient is calculated according to parameters such as the number of parallel units and power grid inner impedance, and the quadratic differential value of the output current is multiplied by the adaptive damping coefficient, so that an active damping set value can be obtained.
Owner:INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
Stably-moving intelligent robot with carrying function
InactiveCN112047264AGood shock absorbing abilityReduce resonance phenomenonLifting framesVibration suppression adjustmentsProcess engineeringRoboty
The invention discloses a stably-moving intelligent robot with a carrying function, and relates to the technical field of intelligent robots. The stably-moving intelligent robot with the carrying function comprises a buffer base and stable supporting structures, wherein a hydraulic lifting structure is arranged below the buffer base, each stable supporting structure comprises a supporting platform, a damping buffer column, a damping spring and a piston column, each damping spring is arranged in the lower end of the corresponding damping buffer column, and a power transmission structure is arranged below each stable supporting structure. According to the stably-moving intelligent robot with the carrying function, the use performance of the whole device is greatly improved while the structure is enhanced, the improved device has good buffering and damping capacity in the using process, the resonance phenomenon of the device in the moving process is reduced as much as possible, the stabledegree of a carried object is increased, the phenomenon that the device and the object topple over due to an unstable gravity center is avoided, and the use requirements of people are effectively met.
Owner:DONGGUAN UNIV OF TECH
Ultrasonic welding head and welding device
ActiveCN111266722AAvoid breakingReduce resonance phenomenonNon-electric welding apparatusUltrasonic weldingEngineering
The invention belongs to the technical field of battery processing machinery, and discloses an ultrasonic welding head. The ultrasonic welding head comprises two welding parts, wherein the two weldingparts are arranged opposite to each other in a Z-axis, each welding part comprises two welding head units, the two welding head units are arranged at intervals in the X-axis direction, and a clearance area is formed between the two welding head units, wherein the welding head units comprise a plurality of welding heads, each welding head is provided with a flat head end and a tip end that are oppositely arranged in the Y-axis direction, and the tips of all the welding heads of the same welding head unit are oriented in the same direction. The ultrasonic welding head has the beneficial effectsthat each welding part comprises two welding head units, the two welding head units perform synchronous operation on the same side of a double-core package, the welding head units are provided with the plurality of welding heads with the tip ends, on the one hand, the friction force is greatly increased, on the other hand, the welding heads are provided with the tip ends and the flat head ends, the tip ends can achieve relatively small resistance in the direction towards the tip ends, the vibration is easier, the flat head ends can guarantee the welding strength during welding, and the welding resonance phenomenon is reduced by arranging the clearance area.
Owner:SBT ULTRASONIC TECH CO LTD
Uniform drying device for mask processing and drying method of uniform drying device for mask processing
InactiveCN113587597ADry evenlyReduce laborDrying gas arrangementsDrying chambers/containersElectric machineryStructural engineering
The invention discloses a uniform drying device for mask processing and a drying method of uniform drying device for the mask processing. The uniform drying device comprises a box body, a transverse plate is fixedly connected to an inner cavity of the box body, a double-shaft motor is fixedly connected to the bottom of the inner cavity of the box body, a worm is fixedly connected to a rotating shaft of the double-shaft motor, the end, away from the rotating shaft of the double-shaft motor, of the worm is movably connected with the bottom of the inner cavity of the box body, vertical rods are movably connected to the two sides of the bottom of the inner cavity of the box body, and the tops of the vertical rods are movably connected with the top of the inner cavity of the box body. The uniform drying device has the advantages that the two faces of a mask can be dried at the same time, the labor amount of an operator is reduced, the drying efficiency is high, and the mask is evenly dried, the problems that an existing mask drying device can only dry one face of the mask, the face of the mask needs to be turned over for drying after drying, the labor amount of the operator is increased, the drying efficiency is low, the phenomenon of uneven heating of the facial mask is easily caused, and the drying quality is reduced are solved.
Owner:蔡志明
Signal synchronization control method and apparatus
ActiveCN108123705AReduce in quantityEliminate resonance phenomenonPulse shapingResonanceSynchronous control
The invention provides a signal synchronization control method and apparatus. The signal synchronization control method comprises the following steps: collecting digital logic signals and synchronousclock signals corresponding to the digital logic signals, judging whether the digital logic signals have a resonance phenomenon, and when the digital logic signals have the resonance phenomenon, adjusting the duty ratios of the digital logic signals and the synchronous clock signals according to a preset reference clock to eliminate the resonance phenomenon. By changing the duty ratios of the digital logic signals and the synchronous clock signals, the resonance phenomenon between the digital logic signals is eliminated, the number of the digital logic signals that jump to the falling edge under the triggering on the rising edge of the respective synchronous clock signals can be reduced, and the "resonance" phenomenon is reduced, thereby reducing the electromagnetic interference to an MCUand improving the stability of the system.
Owner:BYD SEMICON CO LTD
a paper cup
Owner:义乌市纸老虎日用品有限公司
Supercharged power transmission assembly for suspension shaft centrifugal supercharger and centrifugal supercharger
ActiveCN107420189ASolve the speed difference problemBoost air intakeInternal combustion piston enginesEngine componentsImpellerDrive wheel
The invention discloses a supercharged power transmission assembly for a suspension shaft centrifugal supercharger. The supercharged power transmission assembly comprises a plurality of friction wheel groups and a belt wheel in coaxial power connection with one of the friction wheel groups. The end portion of one end of a center shaft of the first friction wheel group stretches out of a box body to be fixedly connected with the belt wheel, the belt wheel is used for being in power connection with an external power unit, and friction wheels of the first friction wheel group are both elastic friction wheels; and at least the friction wheels, close to one end of a centrifugal impeller group, of the second friction wheel group and the third friction wheel group are rigid wheels. The invention further discloses the centrifugal supercharger provided with the supercharged power transmission assembly. According to the supercharged power transmission assembly, through improvement on the friction wheel groups and the belt wheel in the supercharger, part of the friction wheel groups are set as the rigid wheels; and meanwhile, the friction wheel group serving as a drive wheel group is set as only one group, the problem of speed difference caused by existence of different drive wheels can be solved, the resonance phenomena of center shafts are reduced, and the rotation precision defects of the elastic wheels are overcome.
Owner:HUANGSHI XUANYANZHE POWER TECH
Fixing rack
InactiveCN102467179AReduce resonance phenomenonImprove operational efficiencyDigital processing power distributionMechanical engineeringResonance
The invention discloses a fixing rack, which is used for fixing an electronic device. The fixing rack comprises a carrier and at least one bump, wherein the electronic device is clamped between two opposite wall surfaces of the carrier; the bump is arranged on one of the wall surfaces; distance between the bump and the other wall surface is smaller than the width of the electronic device; and with the bump, the wall surface applies a pre-pressing force to one side edge of the electronic device to make the electronic device fixed on the carrier. In the fixing rack, by elastic deformation of the bump, the pre-pressing force is applied to one side edge of a seat which carries the electronic device. Therefore, by adoption of the fixing rack, the electronic device can be steadily clamped in the carrier, so that the resonance phenomenon during operation of the electronic device is avoided, and the operating efficiency of the electronic device is improved.
Owner:INVENTEC CORP
Exhaust muffler of 500T feeder and operation method thereof
ActiveCN110486351AImprove the noise reduction effectReduce resonance phenomenonPipe elementsFluid-pressure actuator componentsReduction treatmentResonance
The invention discloses an exhaust muffler of a 500T feeder and an operation method thereof, and relates to the technical field of the exhaust muffler of a feeder. The exhaust muffler comprises a shell and a connector, wherein the right end of the shell is fixedly connected to the left end of the connector. According to the exhaust muffler of the500T feeder and the operation method thereof, the right side of the inner wall of the connector is fixedly connected to a first fixed plate, a first through hole is formed inside the first fixed plate, a first fixed barrel is fixedly connected to the inner wall of the connector and is located at the left side of the first fixed plate, the inner wall of the first fixed barrel is fixedly connected to a first baffle plate, the right side of the innerwall of the shell is fixedly connected to a sound absorption sleeve, so that the exhaust direction of discharged exhaust gases is changed multiple times, and the resonance phenomenon is reduced; the pressure drop of the gases is subjected to reduction treatment by utilizing multiple structures, so that the gas pressure is prevented from drastically changing, the exhaust gas is relatively uniform,and the return gas phenomenon is basically avoided; and the muffler has a relatively good noise reduction effect.
Owner:XIANGYANG TRADETOOL AUTOMOBILE PARTS
Immersion type holographic dome screen of acousto-optic-electric interaction linkage device
PendingCN112068394AExtended service lifeReduce collision forceNon-rotating vibration suppressionProjectorsEngineeringNoise reduction
The invention discloses an immersive holographic dome screen of an acousto-optic-electric interaction linkage device. The immersive holographic dome screen comprises an immersive holographic dome screen body, the immersive holographic dome screen body is fixedly sleeved with a sound absorption cover, the sound absorption cover is fixedly sleeved with a shell, the shell is provided with a buffer protection adjusting mechanism, and the sound absorption cover is provided with a noise reduction mechanism. The buffer protection adjusting mechanism comprises arc-shaped protection plates arranged onthe left side, the right side, the front side and the rear side of the shell. The immersive holographic dome screen is reasonable in design, the collision force of external objects and personnel to the immersive holographic dome screen body is relieved conveniently, the transmitted resonance force is reduced, the damage risk caused by large collision force of the immersive holographic dome screenbody is reduced, the elasticity of the buffer springs is adjusted conveniently, and the service life of the buffer springs is prolonged; and external noise can be well reduced, the quiet comfort degree of the watching environment is improved, and the use requirements are met.
Owner:厦门曝光科技有限公司
A kind of aluminum alloy decorative wallboard with shock absorption from the wall
ActiveCN105625662BReduce resonance phenomenonKeep quietCovering/liningsFlooringLiving roomWall plate
Owner:HAIYAN MDHO ELECTRICAL APPLIANCE TECH
An ice-breaking and snow-removing device
InactiveCN104878714BImprove obstacle performanceReduce resonance phenomenonNon-rotating vibration suppressionSnow cleaningAgricultural engineeringShock absorber
Owner:CHANGCHUN UNIV
A kind of preparation method of laminated sound insulation material
ActiveCN108556425BIncrease viscosityIncrease roughnessRubber layered productsSound energyComposite media
Owner:NANJING MANSE ACOUSTIC TECH CO LTD
Loudspeaker box
InactiveCN107948888AReduce resonance phenomenonImprove the problem of sound distortionElectrical transducersLoudspeakersEngineeringLoudspeaker
The embodiment of the invention relates to the acoustic and electric field, and discloses a loudspeaker box. The loudspeaker box comprises a shell and a sound emission unit accommodated in the shell,wherein the sound emission unit comprises a vibrating film used for emitting sound via vibration, the vibrating film and the shell are arranged at an interval to form a front sound cavity, the loudspeaker box also comprises a sound emission channel communicating with the outside via the front sound cavity, the front sound cavity and the sound emission channel jointly form a front cavity of the loudspeaker box, at least two through holes penetrating through the shell are formed at the position, corresponding to the front cavity, of the shell, each through hole is covered with an elastic wall, the elastic walls covering the at least two through holes have different resonant frequencies, and each elastic wall is used for absorbing the vibration of different frequency bands. The loudspeaker box can improve the problem of sound distortion, and enhance acoustic performance.
Owner:AAC TECH PTE LTD
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