72results about How to "No resonance" patented technology

The present invention relates to a hi-fi speaker. The diaphragm (1) is comprised of a frame member (2) and filler members (3) filled in the frame member (2). The frame member is comprised of flat plates all of which are arranged in parallel to the vibration direction and radially from the center of the diaphragm (1) toward the outer circumference, are fastened together at the radial center, and are fastened to the drive part (6). This frame member (2) has a high rigidity. The filler members (3) are comprised of foamed material etc. This diaphragm (1) does not have any skins, therefore also does not have any problem with resonance. The sound is emitted from the filler members (3). In the suspension (7), rod-like members (12) are fastened in a line at the both ends of the first leaf spring (11), second leaf springs (13) are fastened to the both ends of the rod-like members perpendicular to the rod-like members, and the both ends of the second leaf springs are fastened to unmovable parts of the speaker. The characteristic resonance occurring inside this suspension is slight and there is little displacement in directions other than the vibration direction. It is possible to use the present invention to form an edgeless plane diaphragm speaker system free of the effects of characteristic resonance and reproducing sound with a high fidelity.

Aiming at problem of poor protecting effect of current harmonic eliminating method and product, the invention discloses a harmonic eliminating and extinguishing arc method and synthesized protecting device of neutral point nonproductive grounding electric network, thereinto the harmonic eliminating method is: When there is syntony, the reactor is merged between the generatrix of the voltage dropping phase and ground to form once harmonic eliminating spur track which can destroy syntony point and suppress syntony overvoltage to harmonic eliminating, and make the capacitance current of the system charge to the reactor to protect the voltage transformer and other electric apploance. Thereinto the extinguishing arc method is: When any phase of the electric network generates single phase arc grounding fault, a reactor is directly merged between the generatrix of the fault phase and ground to form extinguishing arc spur track to suppress the voltage of the fault phase and bypass fault current to realize extinguishing arc. The invention discloses a protecting device which matches with it at the same time, it possesses advantages: the method is novel, simple and reliable, the ratio of property and value is high, and maintenance is convenient.

The invention provides a three-level wave-by-wave current limiting control method and system. The method comprises the steps that when the detected first-phase current of a main power switch tube in each phase of an inverter reaches a preset first current threshold value, the main power switch tubes of the phases where the first-phase currents are located are regarded as main power switch tubes to be processed; outer main power switch tubes in the main power switch tubes to be processed are controlled to be switched off till it is detected that the first-phase currents in the corresponding phases are smaller than the preset first current threshold value; according to comparison between the number, obtained through statistics, of the first jump edges of PWM signals detected in the overcurrent period and a preset value, an appropriate time is determined for controlling the outer main power switch tubes in the main power switch tubes to be processed in the corresponding phases to be consistent with input. Thus, the output current of an electric reactor of the inverter can be gentle and will not substantially drop suddenly, the waveform quality of the current is good in the wave-by-wave current limiting period, resonance is avoided, a system is more reliable, faulty current limiting in the current limiting quitting process is avoided, and the working efficiency of the system is improved.

The invention discloses a large on-water floating structure which comprises multiple lower-portion floating bodies, upper-portion structures and middle connecting structures. Each lower-portion floating body comprises multiple dispersedly arranged strip-shaped floating bodies, the floating bodies are spaced for a certain distance, the sum of water discharging volumes of the floating bodies is greater than that of the floating structure in a whole full-load state. Each middle connecting structure at least comprises multiple connecting structures in the first direction, the first direction is intersected with a horizontal plane, the single strip-shaped floating bodies corresponding to the connecting structures in the first direction are connected with three or more mutually spaced structures, and the cross section widths of the middle connecting structures in the horizontal direction are smaller than the widths of the corresponding strip-shaped floating bodies. The on-water floating structure is wholly in an ultra-flat shape. The large on-water floating structure has a wave height nonlinear response characteristic, can reduce wave load, can achieve ultra large scale, has excellent wave resistance, has structural integrity and stable height redundancy and has the characteristics of no disassembly and no capsizing and sinking under the accident conditions such as collision, reef striking and stranding, and the safety of the floating structure and the life safety of persons on the structure can be ensured.

The invention relates to a phi161 two-parting-drawing large-package heavy direct yarn drawing machine for a glass fiber. The drawing machine comprises a frame (1), a yarn thread forming mechanism (2),a transverse moving subassembly (3), a silk blocking subassembly (4), a creeling atomizing water pipe (5) and a high-pressure impeller cleaning water pipe (6), wherein the yarn thread forming mechanism (2), the transverse moving subassembly (3), the silk blocking subassembly (4), the creeling atomizing water pipe (5) and the high-pressure impeller cleaning water pipe (6) are mounted on the frame;the silk blocking subassembly (4), the transverse moving subassembly (3) and the yarn thread forming mechanism (2) are distributed in sequence from top to bottom on the frame (1). The drawing machineis high in production efficiency, stable in product quality and yield and further long in service life, and has an obvious technical advantage in domestic and overseas glass fiber chopping devices. Due to the appearance of a novel large-package heavy direct yarn drawing machine, an enterprise can be enabled to adapt to the change and the demand of a market at any time; and the market prospect iswide.

The invention relates to a system and method for the absorption and prevention characterized by oscillations of a paper-making machine part, as for example a press part, a dryer part, a press-polishing part, a paper retractor - unwind stand partly, by the fact that between the paper-making machine part and are arranged the paper-making machine part or the part of a building (50), exhibiting regarding this part a repeated mass and a larger oscillation damping capacity, at least the oscillation energy absorbing absorption part (3).

The invention relates to the field of chemical industry, and discloses a synthetic method of N-n-butyl-1,2-benzisothiazolin-3-ketone. The method comprises the following steps: S1) in an organic solvent, o-(methylthio) benzoic acid and an acyl chloride agent are subjected to a reaction to obtain o-(methylthio) benzoyl chloride; S2) the o-(methylthio) benzoyl chloride is dissolved in the organic solvent, a mixture of n-butylamine and the organic solvent is added and subjected to an amidation reaction to obtain N-n-butyl o-(methylthio) benzoyl chloride; S3) the N-n-butyl o-(methylthio) benzoyl chloride is dissolved in water, hydrogen peroxide is added, and the materials are subjected to an oxidation reaction to obtain N-n-butyl o-(methylthio) benzoyl chloride oxide; and S4) in the organic solvent, the N-n-butyl o-(methylthio) benzoyl chloride oxide and the acyl chloride agent are subjected to a ring-closure reaction to obtain the N-n-butyl-1,2-benzisothiazolin-3-ketone. The method can effectively avoid the generation of an O-substituted derivative, the ring-closure reaction is easily carried out, a target product is easily generated, and the cost is low.

The invention discloses a clamp device of a two-shaft synchronous vibration table. The clamp device comprises a front adjustment clamp and a rear adjustment clamp; the front adjustment clamp comprises two parallel front adjustment clamping blocks, namely a first front adjustment clamping block and a second front adjustment clamping block; and the rear adjustment clamp comprises two parallel rear adjustment clamping blocks, namely a first rear adjustment clamping block and a second rear adjustment clamping block. With the independent front adjustment clamp and rear adjustment clamp, the clamp device can be used for a two-shaft vibration table to respectively clamp two shafts of a test piece, the reliability is high; moreover, since relative space between the front adjustment clamp and the rear adjustment clamp is adjustable, the space between the two shafts of the test piece can be adjusted by the clamp, and the location precision is high; furthermore, a rear support lug of the rear adjustment clamp is hinged with a rear adjustment bottom block, and the rear support lug can rotate around a hinge axis relative to the rear adjustment bottom block, so that the vibration table is effectively prevented from damaging the test piece in the work process owning to asynchronous vibration of a front shaft and a rear shaft.

In order to achieve improved turning performance and stable traveling state even when disturbance in the direction of inclination is applied, a vehicle comprises a vehicle body provided with a steering part and a drive part which are coupled to each other, a steering wheel which is a wheel rotatably attached to the steering part and steers the vehicle body, a drive wheel which is a wheel rotatably attached to the drive part and drives the vehicle body, an inclination actuator device which inclines the steering part or the drive part in a turning direction, a lateral acceleration sensor which detects lateral acceleration that acts on the vehicle body, and a control device which controls the inclination actuator device to control the inclination of the vehicle body, wherein when disturbance in the inclination direction of the vehicle body is applied, the control device controls the inclination of the vehicle body by extracting the amount of change caused by the disturbance from the change of the inclination angle of the vehicle body and adding a control value corresponding to the extracted amount of change caused by the disturbance.

The invention relates to a novel aerospace plane which is conceived on the basis of thought on defense of the galaxy, and belongs to the technical field of aircraft engines. A flying disk engine disclosed by the invention integrates top three of the existing engine technologies of human beings into one, and is an epoch-making aerospace plane. A jet engine and a scramjet direct jet engine have a common feature, i.e., a detonation problem, and however, the flying disk engine disclosed by the invention solves the detonation problem tactfully and can fly and hover at very high speed. The engine is originated from a kite; all aircrafts invented by human beings are based on the imitation of birds which run hard towards the wind with two large wings; from an original propeller to a ramjet engine, all aircrafts made by human beings have wings. The kite is invented in China a long time ago, and flies based on the principle of being blown by the wind, which is completely different from the birds. The basic flying principle of a flying disk is specifically as follows: imagining that a person carrying two wings stands still, a fan is installed in front of the person, and the person is blown by the wind provided by the fan to fly, after the person leaves the ground, no relative motion is generated, another person carrying two wings stands in opposition to the person and is blown by the wind provided by another fan, the two persons are joined together hand in hand, and if people are joined together to form a circle, wind blows towards all directions from the centre, so that the flying disk can fly.

The invention discloses a novel system and method for managing electrification railway electric energy quality, wherein the system comprises a traction transformer with a filter winding, a sensing filter circuit, an MMC compensation system, an MMC controller, a voltage and electric current measuring apparatus; the traction transformer high voltage side is connected to electric network; a traction side is connected to a traction arm of an electric locomotive for providing electric power for the electric locomotive; and a low voltage compensation side is connected to the sensing filter circuit and the MMC compensation system. The MMC compensation system is constituted by two connected to single-phase MMC traction arm groups; direct current sides of the two MMC traction arm groups are connected together through a serial capacitor; and a grounding point of the MMC compensation system is led out in the geometric midpoint of the serial capacitor. With the method, harmonic waves are dynamically tracked and suppressed through the MMC technology and the sensing filter technology; active power balance and reactive power adjustment are performed to the load at two traction sides, thereby achieving the purposes of managing the harmonic waves, reactive power and negative sequence of the traction transformer high-voltage side of the electrification railway.

The invention belongs to the field of connection technology, in particular to a flexible fastening bolt of an elastic coupling. The diameter of the cylinder part of the present invention is the same as the diameter of the threaded connection part and larger than the diameter of the flexible hinge part, and the cylinder part and the flexible hinge part are polished rod cylinders; the rear end of the cylinder part is provided with a bolt head, and the front part of the bolt head is provided with an elastic pad sheet, an elastic sleeve is added outside the cylinder, and the diameter of the cylinder of the flexible hinge is between 10mm and 14mm. The device of the invention can absorb the impact of excessive load, so that the flexible fastening bolt of the invention is not easy to break.

The present invention provides a multilayer carbon nano tube thin film stacked loudspeaker based on a thermoacoustic effect, belonging to the field of mechanical design. The loudspeaker comprises an outer frame and multiple layers of carbon nano tube thin films which are parallel to one another and connected in parallel, and the number of the layers is at least 2 and at most 4. The carbon nano tube thin films are formed by carbon nano tubes, the two ends of the carbon nano tube thin films are connected with metal electrodes which are fixed on the outer frame, the metal electrodes at the same side are connected with the same wire, and the metal electrodes connected with each layer of carbon nano tube thin film are not in contact. Sound production elements generate corresponding temperaturechange according to accessed audio signals to allow mediums around to rapidly expand and extract to emit sound waves. The loudspeaker provided by the invention has no a vibration part to avoid a resonance effect; the multilayer carbon nano tube thin film stacked loudspeaker is simple in structure and few in consumable items required by making, can be made to be any shape as required, and the soundfield medium is uniformly heat without a segmentation vibration phenomenon; and the loudspeaker provided by the invention can generate high-volume sound in an audible sound range, and can be appliedto audible sound devices such as a sound and a radio.

The invention discloses a differential photoelectric detection device and a photoelectric test system. The device comprises a differential module and an amplification module which are connected with each other, wherein the differential module is connected with two paths of optical signals for differential operation, and outputs photocurrent signals; the amplification module is connected with the photocurrent signals output by the differential module, converts the photocurrent signals into voltage signals and amplifies the voltage signals for output. The device further comprises an output filtering module arranged at the output end of the amplification module, wherein the output filtering module filters out high-frequency noise signals in the output signals of the amplification module, or filters out high-frequency noise signals and resonance signals in the output signals of the amplification module, and outputs a final detection signal; and the system comprises an acousto-optic generating device, the differential photoelectric detection device and a demodulation module. The differential photoelectric detection device and the photoelectric test system have the advantages of simple structure, low cost, high bandwidth, low noise, no resonance, high stability and the like.

The invention provides a jacking ultrasonic welding machine. The jacking ultrasonic welding machine comprises a welding machine support frame, wherein an energy converter rack is arranged on the welding machine support frame; an ultrasonic generator, an energy converter and a welding head are arranged on the energy converter rack; the energy converter rack is fixed on the welding machine support frame; a workbench is arranged below the welding head; the workbench is connected with a lifting mechanism; and the lifting mechanism is capable of driving the workbench to move up and down. The jacking ultrasonic welding machine differs from a common ultrasonic welding machine in that the energy converter rack is directly fixed on the welding machine support frame and does not move independently, and a jacking pressure is provided through the movement of the workbench below the energy converter rack, so as to realize workpiece welding. With the adoption of the manner, although the moving component is simply replaced only, the energy converter rack can be fixed, and therefore, the faults of resonance, howling and the like are avoided after adjustment during debugging only, and the jacking ultrasonic welding machine is more convenient to use.

The invention discloses an alternating current contactor control structure and control method. Electromagnetic coupling of an alternating current contactor in the prior art is changed into mechanicaltransmission coupling. The combination of a stepping motor, a matched screw hollow shaft, a solid shaft and a movable rod is used to replace a silicon steel sheet and a copper winding. The problems ofoverheating and over-high noise of a long-term charged coil of an original alternating current contactor control method are avoided. The stability, safety and energy consumption are greatly improved.The structure is free of electromagnetic coupling. Without windings and silicon steel sheets, heat and resonance are avoided. In the process of controlling static and dynamic contacts of the alternating current contactor, overheating and over-high noise are avoided.

The invention discloses centrifugal dust removal equipment which comprises a device body. The device body is made of stainless steel chamfer materials and comprises a rotary motor, a centrifugal machine and a dust suction opening, the rotary motor and the centrifugal machine are arranged inside the device body, the dust suction opening is formed in the top of the device body, a rotary shaft is arranged at the bottom of the centrifugal machine, and the centrifugal machine is movably connected with the rotary motor by the rotary shaft. The centrifugal dust removal equipment has the advantages that the centrifugal dust removal equipment is made of the stainless steel materials, a storage device is used as power, and accordingly the device body is light, is low in noise and can conveniently move at any time; resonance and noise can be prevented, and accordingly the safety of workers for underground operation and deep-well operation can be greatly enhanced; water mist and dust in air can besucked into the centrifugal machine by the dust suction opening and a turbine, adsorption filter paper which is quite easy to replace is arranged on the side surfaces of the centrifugal machine, accordingly, large quantities of moisture and the dust can be adsorbed, the quality of work environments for the downhole workers can be greatly enhanced, and the physical health of the workers can be effectively guaranteed.

The invention discloses a formula of a low metal friction material with the addition of high resilience graphite. The low metal friction material is made from the following components of: by weight, 50 parts of boron modified phenolic resin, 25 parts of steel fiber, 200 parts of ferroferric oxide, 200 parts of strontium carbonate, 100 parts of artificial graphite, 50 parts of expanded vermiculite, 30 parts of mica, 10 parts of aramid fiber, 80 parts of a frictional powder, 70 parts of a flexible coke powder, 100 parts of barium sulfate, 50 parts of a red copper powder and 500 parts of high resilience graphite granules of 40 meshes. The invention also discloses a preparation method of the friction material based on the above formula. The beneficial technical effect of the invention is as follows: as there exist a lot of pores in the friction material and the pores vary with the change of pressure applied on the pores, the compression rate of the friction material is increased by 50%, and the friction material can mildly contact with a mating material when braking without generating resonance, so as to eliminate brake noise.

The invention discloses a variable fixed frequency anti-seismic bracket, comprising a base, a straight brace, an oblique brace, a plurality of anti-seismic members, a connecting seat and a frequency converter. Two said bases are mounted on the lower surface of the main structure of the building by expansion bolts; One end of the straight brace is vertically hinged on a bottom plate, and the otherend is connected with a connecting seat through an anti-seismic member; One end of the diagonal brace is hinged with the base through an anti-seismic member, and the other end is connected with the connecting seat through another anti-seismic member; The frequency converter is connected with the connecting seat. The invention can continuously change the natural frequency of the building in the process of shaking, thereby effectively preventing the shaking frequency of the anti-seismic support and the building from being the same, thereby avoiding the occurrence of resonance.

The invention relates to a novel efficient wind driven generator, and belongs to the technical field of generator preparation. The novel efficient wind driven generator comprises a generator body and a plurality of blades, the generator body and the plurality of blades are in transmission connection through a rotating main shaft and a plurality of blade skeletons, the rotating main shaft and the generator body are in rotatable transmission connection, each blade is of an arc spoon-shaped structure, the blades are fixedly riveted to the blade skeletons in a central symmetry mode, the directions of spoon openings of the blades in the central symmetry mode are opposite, and parts of the blades intersect with one another.

The invention belongs to a three-phase compensation dynamic reactive power compensation device which comprises electric reactors and capacitors, wherein the electric reactors and the capacitors are connected to an A-phase circuit, a B-phase circuit and a C-phase circuit. The three-phase compensation dynamic reactive power compensation device is characterized in that a high-voltage circuit is respectively connected with two paths of electric reactors through the A-phase circuit, the B-phase circuit and the C-phase circuit led by an automatic switch DK via a contactor or a compound switch, an induction coil of one path of the electric reactors is connected with one pole of a single capacitor CN, and the other pole of the single capacitor CN is connected with a zero line; a terminal T1, a terminal T2 and a terminal T3 of an induction coil of the other path of the electric reactors are connected with terminals of a capacitor bank, a delta connection method is adopted in the capacitor bank, the terminal T1 is connected with one pole of the capacitor C1 and one pole of the capacitor C2, the terminal T2 is connected with the other pole of the capacitor C1 and one pole of the capacitor C3, and the terminal T3 is connected with the other pole of the C2 and the other pole of the capacitor C3. The three-phase compensation dynamic reactive power compensation device is used for dynamic reactive power compensation of an electric power system, minimization of injection power harmonic waves can be achieved by controlling, and compared with a traditional dynamic reactive power compensation device, the three-phase compensation dynamic reactive power compensation device has a more ideal comprehensive property.