59results about How to "Reduce resonance phenomenon" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.