67results about How to "Not easy to resonate" patented technology

The invention discloses a power frequency transformer-free three-phase-single-phase voltage transformation device. According to the three-phase-single-phase voltage transformation device, a single-phase-single-phase converter multi-module cascade structure is adopted to withstand three-phase power grid high-voltage; single-phase-single-phase converters at three phases are in cascade connection with one another and then are connected with in series with each other, so as to realize output, and therefore, a power frequency transformer can be omitted, and the three phase-single-phase voltage transformation device can be directly connected with a single-phase power supply network, and output voltage level can be improved; the single-phase-single-phase converter is mainly composed of a rectifying circuit, a bidirectional DC-DC conversion circuit and an inversion circuit. The single-phase-single-phase converters of the voltage transformation device are simple in structure, and therefore, the structure of the system can be greatly simplified, and two-way flow of the power of a three-phase power grid and a single-phase power supply network can be realized, and energy transmission efficiency can be improved, and thus, unbalance of the three-phase power grid can be avoided; and the converters can have reactive power and harmonic compensation functions through selecting proper control strategies, and therefore, electric energy quality of the three-phase power grid side can be improved, and reactive power and harmonic can be compensated for the single-phase power supply network.

The invention relates to a proactive vibration damping control method for an electric vehicle. The method comprises the following steps: a position sensor detects the absolute position [theta] of a motor rotor and a speed calculation module calculates motor speed [omega]; a proactive vibration damping control module received an enable signal transmitted from an electric control system and a speed signal [omega] output by the speed calculation module, and calculates compensation torque Tc according to the product of a compensation torque initial value Tci and a scaling factor f, an addition module and an electric control system receive the compensation torque Tc; the addition module superposes a torque instruction T* and the compensation torque Tc to obtain a torque reference Tref, and outputs the torque reference Tref to a current control module; and the current control module generates a current instruction based on the torque reference Tref, performs current closed-loop control according to the phase current ia and ib and a position signal [theta], and outputs a low-voltage-signal-level pulse width modulation signal to an inverter. The method solves the drive train resonance of the electric vehicle caused by frequent engine start and stop or large-torque step, and improves the low-speed wobble.

A control device and control method for elevators, which can prevent elevators from unnecessarily transferring to a control operation action in the situation of weak swaying of buildings, so that the service is improved. The control device for elevators includes: a calculation part (42) for calculating swaying quantity of a long size component (6) in the moment that a determination data value of swaying of buildings exceeds an operation reference value when a lift car is stopping; a comparison portion (32) for determining whether the swaying quantity of the long size component (6) exceeds a reference index value or not; a standard usual operation control portion (45) for performing an usual operation control on the lift car (7) when the swaying quantity of the long size component is less than the reference index value and the determination data value exceeds the operation reference value, and the standard usual operation control portion for automatically calling landing and registering to allow the lift car (7) to drive to change a stop position when the lift car cannot move over a preset time.

The invention relates to an elevator comprising an elevator car 1, which is preferably suspended at the top thereof on a carrying means and guided on tracks, a driving disk mechanism, and a counterweight, wherein the carrying structure is made two frames 2a, 2b surrounding the elevator car in the manner of a closed ring for the purpose of transferring the forces caused by the mass of the elevator car, including the payload thereof, onto the carrying means and vice versa, each ring being substantially formed by closed hollow profiles, the two frames being rigidly connected to one another by bridges 4, 16, resulting in a unified, fixed carrying structure in the shape of a twin frame, each of the two frames being located symmetrically to the side of the guide rails and not flush with the guide rails and using the installation space already available to the side of the guide rails. The frames 2a, 2b are arranged at such a distance from one another that space remains between them for accommodating at least one essential elevator element and each of the frames is either an integral component of two side walls and the ceiling of the elevator car, or at least resting with substantially the entire surfaces thereof from the outside against the side walls and ceiling of the elevator car.

The invention discloses a high-impact piezoelectric accelerometer. The high-impact piezoelectric accelerometer comprises a hollow installing seat, a core is arranged in the hollow installing seat through a compressing ring in a press fit mode and is connected with a cable through a plug, one shock insulation cushion and one insulating cushion are arranged between one end of the core and the compressing ring, and another shock insulation cushion and another insulating cushion are arranged between the other end of the core and the installing seat. Because the shock insulation cushions large in damping are installed at the two ends of the core of the piezoelectric accelerometer, high-frequency large-amplitude acceleration generated by strong-impact waves on a structure can be filtered out, and transverse acceleration transmitted to an acceleration sensor can be reduced so as to achieve the purpose of reducing zero drift. Due to the adoption of a base strain isolation type structure, strain of sensitive elements can be effectively reduced; because the insulating cushions are arranged at the two ends of the core and serve as isolators, the accelerometer can be isolated from an installing face mechanically so that effective strain transmitted to the accelerometer can be reduced and the purpose of reducing zero drift can be achieved.

The invention discloses an active harmonic management device. The device comprises an instruction current operational circuit and a compensating current generation circuit. The instruction current operational circuit is used for detecting harmonic wave and reactive power current components in compensating load currents, and the compensating current generation circuit is used for generating actual compensating currents according to an instruction signal of the compensating currents, wherein the instruction signal is obtained according to the instruction current operational circuit. The compensating current generation circuit comprises a main circuit, a driving circuit and a current tracking and controlling circuit. The active harmonic management device has the advantages that dynamic compensation is achieved, harmonic waves changeable in frequency and size and changeable reactive power can be compensated, and response to changes of a compensated object is rapid; the harmonic waves and the reactive power can be compensated at the same time, and the intensity of the compensated reactive power can be continuously adjusted; influences caused by power grid impedance are small, and harmonic vibration between the active harmonic management device and the power grid impedance is not prone to occurring; changes of power grid frequencies can be tracked, so that the compensating performance is not affected by the changes of the power grid frequencies.

The invention discloses components and parts of a mechanical machine tool and a manufacturing method thereof. The manufacturing method mainly comprises the following steps: according to characteristic structures and the high rigidity of the components and parts of the mechanical machine tool, mounting and setting proper steel brackets, reinforcement net materials and other reinforcement structures into mold cavities of a molding mold; mounting required metal parts, wiring pipelines, tracks and other embedded components; and then pouring the mixed slurry of artificial stones into the molding mold for coagulation formation, and after demolding and subsequent manufacturing operations, obtaining the components and parts of the mechanical machine tool consisting of artificial stone bodies. The manufacturing process is simple and reduces the energy consumption; and simultaneously, characteristics of the artificial stones can be utilized to endow the components and parts of the mechanical machine tool with excellent mechanical performance, such as good vibration damping effect, low coefficient of heat conduction and the like.

The invention discloses a modular space truss structure light semi-submersible suspension cable deep sea net cage. The net cage is characterized in that a net cage framework is modularly constructed and expanded by truss nodes and truss rod pieces, and comprises a top surface truss, a semi-submersible truss arranged on the top surface truss, and a bottom surface truss; the top surface truss and the bottom surface truss are multilayer trusses in the inner and outer directions and comprise buoyancy adjustable layers and buoyancy non-adjustable layers; the semi-submersible truss comprises a buoyancy adjustable layer; and a plurality of groups of suspension cables are included and are arranged between the top surface truss and the bottom surface truss. The net cage framework is constructed ina modular design mode, the multi-layer truss structure meets the requirement for good strength and safety, the unit use cost of equipment is greatly reduced, and a road is laid for large-scale offshore culture; through active adjustment of buoyancy adjustable points, the top surface truss and the bottom surface truss have the active approaching and folding functions, rapid contraction of the netting and the culture space is achieved, rapid fish collection or transfer is achieved in cooperation with pumping, and external disasters such as storms are avoided.

The invention relates to the technical field of civil engineering, in particular to a shock isolation support with a servo shock isolation system. The shock isolation support with the servo shock isolation system comprises a laminated rubber support, wherein a support protective sleeve is arranged on the outer surface of the laminated rubber support in a sleeving manner; an upper flange plate is connected to the upper end of the laminated rubber support through connecting bolts, and a lower flange plate is connected to the lower end of the laminated rubber support through connecting bolts; an upper cover plate is fixedly connected to the upper surface of the upper flange plate; and a servo control system for enabling the shock isolation support with the servo shock isolation system to perform adaptive adjustment is mounted on the lower flange plate. The shock isolation support with the servo shock isolation system disclosed by the invention is simple in structure; a feedback control technology is introduced, so that the driving optimal feedback control of the shock isolation system is realized; the shock isolation support has an adaptive adjustment mechanism, so that different control targets can be realized; and the shock isolation support has an effective frequency bandwidth and an advantage of being not liable to resonate with a control structure, the mechanical stability and the electromechanical performance stability of the system can be realized, and the shock insulation requirements of engineering structures having special shock insulation requirements, mechanical equipment, valuable articles and the like can be met by the shock isolation support.

The present invention is a glass plate constituent in which the loss factor is 1*10<-2> or more and the longitudinal wave sound velocity value in the plate thickness direction is 5.5*10<3> m / s or more.

The invention provides a rising swing blade type vertical-shaft wind generating set, wherein a hinged seat is arranged at one ends of support rods; the hinged seat is hinged to a rotating support through a first pin shaft and the axial direction of the first pin shaft is perpendicular to the length direction of the support rods; fan blades are hinged to the other ends of the support rods through a hinged mechanism; a buffer cushion is arranged between the rotating support and the support rods. Compared with the prior art, the support rods are hinged to the rotating support through the hinged seat and the first pin shaft, the stability of the vertical-shaft wind generating set is improved by virtue of the gyroscopic effect, and in the meantime, the buffer cushion made of an elastic material is arranged between the rotating support and the support rods of the rising swing blade type vertical-shaft wind generating set; the buffer cushion causes all the support rods to be located within the same horizontal plane, and as a result, the stability of the whole set is effectively guaranteed and the output power of the generator is kept stable. In addition, as the fan blades are hinged to the support rods through the hinged mechanism, the windward area of a wind wheel can be adjusted according to the wind power; the rising swing blade type vertical-shaft wind generating set is capable of generating power normally even at strong wind; the rising swing blade type vertical-shaft wind generating set is good in strong wind resistance, simple in structure without tail vane, material-saving and low in composite cost.

The invention relates to the field of knitting machinery, in particular to a warp knitting machine with a bilaterally-driven guide bar-bed assembly, which comprises a frame, as well as a guide bar-bedassembly, a first spindle, a second spindle and a first motor serving as power, which are mounted on the frame; one axial end of the first spindle is in transmission connection with the output end ofthe first motor; the first spindle is provided with three to six first cams rotating in sync, each first cam is pivotally connected with a rocker of the guide bar-bed assembly through a first transmission device; the second spindle is provided with three to six cams rotating in sync; the second cams are pivotally connected with a rocker on the other side of the guide bar-bed assembly through a second transmission device, the first cams and the second cams have the same circumferential outline along the circumferential direction, the cams have a phase difference of 180 degrees, and the two spindles are synchronized through a synchronization mechanism. The warp knitting machine is applied to warp knitting equipment and provides a guide bar-bed assembly rocking device suitable for high-speedproduction.

The invention discloses a modular space truss structure deep sea net cage. The cage is characterized in that: a net cage frame is of a full-closed cage-shaped space truss structure, is constructed andexpanded in a modular mode through truss nodes and truss rod pieces, is a multi-layer truss in the internal and external direction and comprises a buoyancy adjustable layer and a buoyancy non-adjustable layer; each truss node comprises a buoyancy adjustable node and a buoyancy non-adjustable mechanical node, the buoyancy adjustable node is a thin-wall hollow shell which is expanded relative to the truss rod piece and is used for generating buoyancy required by the modular space truss structure deep sea net cage in work and used for adjusting the snorkeling, the bearing capacity and the underwater posture of the modular space truss structure deep sea net cage; and the breeding net is a totally-closed breeding net. A multi-layer totally-closed cage-shaped space dense truss structure comprising the buoyancy adjustable layer and the buoyancy non-adjustable layer is adopted as a modular structure main body of the deep sea net cage, and the two prominent problems of stormy wave resistance and benefit generation in deep sea cultivation are solved.

The invention relates to a crop harvesting ploughing tool comprising a supporting rack connected to a tractor. A transferring case is mounted on the supporting rack; the transferring case is connected with a transmission shaft; the transmission shaft is connected with a tractor power output via a universal joint; the transferring case is connected with an eccentric wheel via a connection shaft; the eccentric wheel is connected with a vibration rod; a soil-lifting plough is fixed under the supporting rack; a front soil vibration shifting fork is hinged behind the soil-lifting plough; the front soil vibration shifting fork is hinged with a back soil vibration shifting fork; the front soil vibration shifting fork is hinged with a vibration rod; the vibration rod is connected with a second vibration rod; and the second vibration rod is hinged with the back soil vibration shifting fork. The crop harvesting ploughing tool can be installed on an elevated tractor; crops of two ridges or more can be harvested; the soil vibration shifting forks can vibrate in a waveform; and the back soil vibration shifting fork has more period and amplitude changes.

The invention provides a serial-parallel mixed type filtering and protecting device of passive power. The serial-parallel mixed type filtering and protecting device of the passive power does not easily resonate with a system, effectively reduces total current of a system, and has an obvious energy-saving effect. The serial-parallel mixed type filtering and protecting device of the passive power comprises a first electric reactor (L1), a first capacitor (C1), a transformer (T1), a first sing-phase silicon controlled rectifier (Q1), a second single-phase silicon controlled rectifier (Q2), a first voltage dependent resistor (Y1), a second voltage dependent resistor (Y2), a current limiting reactor (L0), a lightning arrester (B1), a second electric reactor (L2), a second capacitor (C2), a third electric reactor (L3), a third capacitor (C3) and a vacuum contactor (K). According to the serial-parallel mixed type filtering and protecting device of the passive power, the serial-parallel mixed mode is adopted, the electric reactors and the capacitors are connected in series to be designed with traditional filtering branches in a mixed mode, the capacity requirement of series branches is effectively reduced, the filtering performance is improved, and meanwhile the cost is reduced. The package scheme is based on passive power elements, a protecting circuit is also based on self triggering, the reliability is high and the service life is long.

The invention discloses a high-rotating-speed motor and an assembling method thereof. The high-rotating-speed motor comprises a machine shell, a rotating shaft and a bearing sleeve, wherein the machine shell is of an annular structure with the left end and the right end open, an installation ring coaxial with the machine shell is arranged in the machine shell, the outer diameter of the installation ring is smaller than the inner diameter of the machine shell, the length of the installation ring in the left-right direction is smaller than the length of the machine shell in the left-right direction, a plurality of air guide pieces are evenly distributed between the installation ring and the inner wall of the machine shell, a stator installation cavity and a bearing installation cavity are sequentially formed in the installation ring from left to right; an annular protruding part is arranged in the middle of a stator installation cavity of the installation ring, the outer wall of the right portion of the bearing sleeve is matched with the inner wall of the left portion of the machine shell, the outer wall of the right portion of the bearing sleeve is inserted into the inner wall of the left portion of the machine shell, the rotating shaft is inserted into the bearing sleeve and the machine shell in the left-right direction, the middle of the rotating shaft is sleeved with a magnetic ring, and a stator assembly is mounted in the stator mounting cavity. The high-rotating-speed motor has the advantages of being not prone to resonance, low in noise and the like.

The invention provides a manufacturing method of a mouse cage assembly, and relates to the field of electric appliances. The manufacturing method of the squirrel cage assembly comprises the following steps: processing to obtain a conducting bar and a rotor core, wherein the rotor core is provided with two opposite end surfaces in a first direction; enabling the conducting bars to penetrate through the rotor core in the first direction and protrude outwards out of the two end faces; obtaining corresponding end rings close to the end faces through additive manufacturing, wherein the end rings are fixedly connected with the guide bars; and in the first direction, the distance between each end face and the corresponding end ring is less than a preset value. According to the manufacturing method of the squirrel cage assembly, the integrality of the squirrel cage assembly is improved, the inherent frequency of the squirrel cage assembly is optimized, then the squirrel cage assembly is not prone to resonance with external excitation in the operation process, vibration is reduced, and the service life of the squirrel cage assembly is prolonged.

The invention belongs to the field of mechanical equipment for crushing solid particles in a water environment, and relates to a water jet crusher, which includes a slurry box, a box cover and a collection tank. The box cover, the box cover is equipped with a material inlet, and the collection tank is equipped with a material outlet; the slurry box is equipped with a main shaft, and a number of knife groups are fixed on the main shaft. Each knife group includes several knife bodies, and the adjacent knife bodies are dislocated. Arrangement, one end of the main shaft is connected to the power output device; the inner wall of the slurry box in front and rear of the main shaft is provided with fixed blades, and the fixed blades cooperate with the cutter body. The structure design of the present invention is reasonable. When the cutter body and the fixed blade are combined for crushing and cutting, due to the dislocation arrangement of the adjacent cutter bodies, the contact time of all the cutter bodies and the fixed blade is inconsistent, so resonance is not easy to occur, and because the adjacent cutter bodies do not cut at the same time, The probability of material sticking to the cutter body is reduced, and at the same time, adjacent cutter bodies do not apply force at the same time, which avoids the occurrence of slipping and chipping.

The invention discloses a light semi-submersible deep sea net cage with a modular space truss structure. The net cage is characterized in that: a net cage frame is constructed and expanded by truss nodes and truss rod pieces in a modular mode and comprises a totally-closed or bottom-opened semi-closed light cage-shaped space truss structure and a semi-submersible truss arranged on the light cage-shaped space truss structure; the truss nodes comprise buoyancy adjustable nodes and buoyancy non-adjustable mechanical nodes, and the truss rod pieces comprise connecting rods among the buoyancy adjustable nodes, connecting rods among the mechanical nodes and connecting rods among interlayer nodes; the light cage-shaped space truss structure is a multi-layer truss in the internal and external directions; the semi-submersible truss comprises a buoyancy adjustable layer; and a plurality of light schemes are respectively constructed on the top surface truss, the side surface trusses and the bottom surface truss. A standardized structure is adopted, the universality of parts is good, the structure is simple, production, installation and maintenance are convenient, the loss rate of aquaculturewater due to ocean currents and stormy waves is small (smaller than or equal to 5%), the unit use cost of equipment is greatly reduced, and a road is laid for large-scale offshore aquaculture.

The invention provides a novel vibrating diaphragm, and relates to the technical field of loudspeaker products. The vibrating diaphragm comprises a vibrating plate and a flexible plate adaptive to andattached to the vibrating plate. The vibrating plate comprises a spherical top part, a folding ring part annularly arranged on the periphery of the spherical top part and an extension part annularlyarranged on the outer side of the folding ring part, and the folding ring part protrudes towards the side away from the vibrating plate and attached to the flexible plate. The flexible plate comprisesa center plate used for providing rigidity, a frame part attached to the extension part and a plurality of supporting strips connected between the center plate and the frame part. An annular cavity is formed between the central plate and the frame part. The supporting strips are arranged in the annular cavity, and the center plate, the frame part and the supporting strips are arranged in a coplanar mode. The plurality of supporting strips are connected and supported between the central plate and the outer frame part which is attached to the extension part of the vibrating plate, so that the supporting strips are in a linear state and are not easy to generate resonance when the vibrating diaphragm works, and the vibrating plate and the flexible plate are stably attached, so that the overall sensitivity is improved. The invention further provides a loudspeaker.

The invention provides a drum washing machine and a control method thereof. The drum washing machine comprises an inner drum, an inner drum drainage port and a resonance drainage device, wherein the inner drum is provided with a washing chamber capable of independently containing washing water; the inner drum drainage port is formed in the inner drum; and the resonance drainage device is installedon the inner drum drainage port to keep the inner drum drainage port in a normally-closed state, and when the rotating speed of the inner drum exceeds a certain value, the resonance drainage device opens the inner drum drainage port. According to the drum washing machine, the resonance drainage device is adopted to control on-off of the inner drum drainage port, the resonance drainage device utilizes the working principle of the washing machine, in the washing or rinsing stage, the rotating speed of the inner drum is low, resonance is not likely to happen to the resonance drainage device, andthe resonance drainage device keeps the inner drum drainage port in a normally-closed state, so that washing water is independently contained in the inner drum in the washing stage and the rinsing stage; and when drainage or dehydration is needed, the inner drum is controlled to rotate at a high speed, the resonance drainage device resonates to do reciprocating motion, the inner drum drainage port is opened in the reciprocating motion process, and drainage of the inner drum is achieved.

The invention discloses a fiber reinforced composite material anti-vibration hammer. The shockproof hammer comprises a line card and hammers. There are two hammers which are arranged on two ends of anelastic rod. A middle portion of the elastic rod is provided with a connection board forming an integral structure with the line card. The connection board is a composite material pultrusion sheet material. An elastic rod is a composite material pultrusion bar material. Each hammer is a complex body of structural steel and a composite material. A connection portion of each hammer and the elasticrod is the composite material. The connection portion of each hammer and the elastic rod is the structural steel. Each hammer is the structural steel whose external layer is wrapped with the compositematerial. The composite material is a fiber reinforced composite material. In the invention, through using the fiber reinforced composite material, problems that a capability for an existing vibration hammer to absorb energy of vibration is poor, the vibration hammer is easy to be oxidized, and a corrosion resistance capability is poor are solved; an eddy current is eliminated; and line energy consumption is reduced.

The method includes following approaches: (1) a new type reactive power generator is connected in parallel to three phases of major loop at secondary side in three phase three wire system or three phase four wire system; (2) or a new type reactive power generator is connected in parallel to head part of secondary winding of three phases of major loop at secondary side in three phase three wire system as well as a new type reactive power generator is connected in parallel to tail part of secondary winding of three phases; (3) or in building block mode, multiple combined new type reactive power generators are connected in parallel. Disclosed generator takes in and sends out large reactive components, compensates current. Features are: quick response, accurate control of voltage.

The invention relates to the technical field of wind turbine generators, in particular to a vortex-induced vibration suppression device, a blade assembly and a wind turbine generator. The vortex-induced vibration suppression device comprises a turbulent flow sleeve, the cross sectional area of the turbulent flow sleeve is gradually reduced from one end to the other end, and the turbulent flow sleeve is used for wrapping the tip of the blade. The blade assembly comprises the vortex-induced vibration suppression device. The wind turbine generator comprises the blade assembly. According to the vortex-induced vibration suppression device, the blade assembly and the wind turbine generator provided by the invention, the problem of resonance of the blade caused by vortex-induced vibration can be relieved to a great extent, so that the blade is not easy to damage due to serious swinging; in addition, the turbulent flow sleeve is convenient to put on and take off.

The disclosed acoustic insulator mat includes a first absorber layer made of a non-woven fibrous material. The non-woven fibrous material comprises a mesh of intertwined fibers that defines a plurality of cavities. The first absorber layer has a first side and a second side. Peripheral cavities are arranged along the second side of the first absorber layer between peripheral fibers. A coating is disposed on the second side of the first absorber layer. The coating is adhered to the peripheral fibers and thus includes a plurality of discontinuities at the peripheral cavities such that the coating provides a partial barrier to noise at the second side of the first absorber layer. The acoustic insulator mat may optionally include a second absorber layer that is retained on the first absorber layer by the coating. A method of manufacturing the acoustic insulator mat is also disclosed.

The invention discloses sound-insulation wallpaper, which relates to the technical field of a decoration material. The sound insulation wallpaper comprises a decoration surface layer and a basic layer disposed below the decoration surface layer, and is characterized in that a sound absorption layer is arranged between the decoration surface layer and the basic layer, wherein the sound absorption layer adopts a composite material prepared by adopting one or a mixture of two of sugarcane fibers and rubber or resin as a basic layer and adopts one powder or mixed powder of iron, copper and aluminum as a filling agent. By adopting the sound insulation wallpaper, the problems that the body health is influenced by the environmental pollution caused by the dropping of heavy metals of the existing sound absorption wallpaper and the production cost is high are solved.

The invention belongs to the field of cooling-water machines, and particularly relates to a water-cooled cooling-water machine. The water-cooled cooling-water machine comprises a refrigeration cycle,a condenser water-cooled heat dissipation cycle and an evaporator cold water control cycle, an expansion valve in the refrigeration cycle comprises a valve shell, an ejector rod A, a diaphragm, a sealing cover, an ejector rod B and the like, and a fixed block A is mounted between an accommodating groove C used for accommodating a refrigerant in the valve shell and a through groove for distributionthe refrigerant. In the initial starting time period of the cooling-water machine, the pressure change of the refrigerant in the containing groove C15 is small, and therefore the moving speed generated when the diaphragm drives the ejector rod A, the ejector rod B and other moving parts is low due to the fact that the pressure difference is generated between the two sides of the diaphragm; and the vibration frequency of the ejector rod A and the ejector rod B in the initial starting time period of the water cooling machine is reduced, so that the ejector rod A and the ejector rod B do not generate a howling phenomenon caused by rapid movement and resetting in a short time.