50results about How to "Facilitates a smooth transition" patented technology

The invention discloses a system and method for realizing broad and narrow band resource dynamic allocation based on a narrow band air interface, and belongs to the technical field of trunking communication. The invention aims to solve the problems that in the exiting implementation method of broad and narrow access fusing service, when a PDT air interface short message carries control information, the response speed of call establishment is low, and the utilization ratio of broad band resources is low. The system comprises a fused base station and a terminal, wherein the fused base station and the terminal perform information interaction in a wireless mode; the fused base station comprises a trunked base station controller, a plurality of PDT base station channel units and a broad band service unit. The method comprises the stages of call establishment, call process control and clearing control; the broad band service unit is added to the original PDT base station; the signaling interaction of broad and narrow services is performed through PDT air interface signaling extension; then broad and narrow resource dynamic allocation is realized. The system is applied to broad and narrow resource dynamic allocation.

The invention discloses a switch method for user terminals to participate in switch decisions, including the following steps: at first, the source base station chooses a group of down node-sets according to the measurement information, and then during switch, the user terminal chooses an optimized switch target from former down node-sets chosen by the resource base station according to present measurement information. The invention realizes macro-diversity of downstream data during switch preparation stage, which not only solves the problem that UE is easily dropped during switch process, but also brings diversity gain, improves service quality effectively, increases switch speed. The invention also discloses a system, a base station and use terminal for user terminal to participate switch decision. Because the target switch channel is independently chosen by user terminal during switch according to the invention, it can be more accurate to switch to a perfect target channel in the situation of rapidly changed wireless environment, thereby ensuring the switch quality of switch effectively.

The invention discloses a method for mobile terminal to realize channel switch, which includes the following steps: during the switch preparation stage, a source base station ensures a target node and a down node-set according to measurement information, and the down node-set begins to provide downstream transmission data for the mobile terminal during the switch preparation stage; during the switch stage, the mobile terminal switches the uplink into the target node, then the downstream data is still sent by down node-set; after the switch, the down node focus the node release resources except the target node, and the target node provides up-down service for mobile terminal. The invention also discloses a system and a base station for mobile terminal to realize channel switch, using the method, system and base station can reduce drop-calls and resource occupation of mobile terminal in switch process, and realize continuous receiving of downstream data in the whole switch process by mobile terminal, and improves transmission service quality of mobile terminal.

The invention provides an air conditioner. The air conditioner comprises a condenser, a water beating device and a guiding device, wherein a water receiving tank is arranged below the condenser; the water receiving tank is used for storing condensed water formed by the air conditioner; the water beating device is positioned in the water receiving tank below the condenser; the water beating deviceis used for enabling the condensed water in the water receiving tank to splash; the guiding device is connected with the upper end of the condenser and is used for guiding the splashed condensed waterto the upper part of the condenser. By the adoption of the technical scheme, the condensed water in the water tank is enabled to splash by the water beating device, and the condensed water splashed to the guiding device flows through the surface of the condenser in a reasonable path to cool the condenser on the premise the wind resistance of the condenser is not influenced, so that the working efficiency of the condenser is improved, the noise generated when water drops collide with the peripheral area of the condenser is effectively avoided, a water bridge formed when larger water drops aresplashed to fins of the condenser is avoided, and thus the resistance of air flowing through the condenser is increased.

The invention discloses a flexible ecological spur dike system. The flexible ecological spur dike system comprises a spur dike body, the spur dike body is connected with a bank on the horizontal plane to form a T shape and comprises an arc jetty head, an arch dike body and a bank-connection dike root in sequential connection, and the bank-connection dike root is connected to the bank through stairs; an included angle formed by the spur dike body and a downstream water flow direction is smaller than 90 degrees; on the longitudinal section, the spur dike body comprises a reinforced earth dike core, a flexible ecological dike slope, dike toe slope pressure parts and a water affinity platform, the flexible ecological dike slope covers the reinforced earth dike core, dike toe portions on two sides of the flexible ecological dike slope are filled by the dike toe slope pressure parts by means of dumping fill, and the water affinity platform is arranged on the top of the flexible ecological dike slope. The flexible ecological dike slope comprises waste tire reinforced planting soil, geogrids and aquatic plants in hierarchical staggered stacking arrangement. By adoption of waste tires for construction of the spur dike system with dual functions of flexibility and ecology, utilization rate of the waste tires is greatly increased, resource regeneration is realized, and construction cost is saved; in addition, conformance to river regimes, decrease of ship collision accident rate and providing of the ecological plant platform are realized.

The invention discloses a high-speed pantograph head, comprising a sliding plate, small bow angles, large bow angles and a frame-shaped spring, wherein the section of the sliding plate is in a stream line form, the lower part of the sliding plate is an elongated sliding plate slot, the slot is embedded with carbon slide blocks or other materials, the frame-shaped spring is connected below the sliding plate by virtue of a bracket, the front end of the frame-shaped spring is connected with the sliding plate by virtue of a support and the bracket, the rear end of the frame-shaped spring is hinged with the upper frame of a pantograph, and a group of large bow angles are inserted and fixed in a hinge at the upper end of the upper frame of the pantograph. Under the coordination of a pantograph balanced beam, the frame-shaped spring can always maintain the sliding plate of the pantograph to be parallel to a guide rail plane, and the sliding plate can be always in close contact with a contact wire under the regulating action of the bracket. The structure of the pantograph head is simple, the weight is light, the air resistance when the pantograph head moves, the impact resistance is high, the current of the pantograph at a high speed is favourable, the current of the pantograph of a train on a conventional railway or a light railway can be improved.

The invention provides a combustion chamber of a wide speed range ramjet engine and a working method thereof, wherein the combustion chamber comprises an air inlet connecting section (1), a forward-inclined concave combustion chamber (2) and a tail nozzle (3), wherein the air inlet connecting section (1), the forward-inclined concave combustion chamber (2) and the tail nozzle (3) are arranged successively; the air inlet connecting section (1) is a bridge component, through which a variable supersonic air inlet outlet is connected with the combustion chamber inlet, the area of the forward-inclined concave combustion chamber (2) is larger than that of the air inlet connecting section (1); the air inlet connecting section (1), the forward-inclined concave combustion chamber (2) and the tail nozzle (3) as well as the structure of the combination of the air inlet connecting section (1), the forward-inclined concave combustion chamber (2) and the tail nozzle (3) is symmetrical with a centralplane, or rotationally symmetrical with a central axis.

The invention discloses a winding device capable of improving the service life of a steel wire rope. The winding device comprises a roller (1), the steel wire rope (2) and a pulley (4), wherein the roller (1) is provided with an inner layer rope carrying surface (3) and an outer layer rope carrying surface (5); the radius of the outer layer rope carrying surface (5) is more than that of the inner layer rope carrying surface (3); the steel wire rope (2) is wound on the inner layer rope carrying surface (3) for n layers and can smoothly transit and enter the outer layer rope carrying surface (5); the rope head of the steel wire rope (2) is fixed on the end part of the inner layer rope carrying surface (3); and when the steel wire rope (2) is wound on the roller (1), the rope section at an orifice of the steel wire rope (2) is positioned on the outer layer rope carrying surface (5). The winding device can improve the service life of the steel wire rope and has convenient manufacturing and reliable performance. The winding device can be applicable to the winding work of a rotary drilling machine and can be used in other winding devices.

The invention provides a method for connecting a high-entropy ceramic and a metal. The method comprises the following steps: S1, carrying out vacuum diffusion welding on a high-entropy ceramic and TaZrNbHfTi refractory high-entropy alloy at a high temperature to obtain a welding assembly; and S2, carrying out vacuum diffusion welding on the TaZrNbHfTi refractory high-entropy alloy of the welding assembly and a metal to complete the connection of the high-entropy ceramic and the metal. According to the connecting method for the high-entropy ceramic and the metal, the TaZrNbHfTi refractory high-entropy alloy serves as the middle layer, so that diffusion welding of the high-entropy ceramic and the metal is achieved, good wetting of base metal and smooth transition of the thermal expansion coefficient can be achieved, and generation of defects such as cracks is restrained so as to improve the strength of a joint.

The invention discloses a manufacturing method of a flexible OLED substrate. The manufacturing method comprises the following steps of S1, providing a supporting plate; S2, forming a flexible materiallayer on the supporting plate; S3, forming a barrier layer on the flexible material layer, wherein the barrier layer adopts a multi-layered structure, and comprises an inorganic layer and an organiclayer stacked mutually, wherein the inorganic layer is arranged on the surface on one side, far from the flexible material layer, of the barrier layer; the inorganic layer adopts the material of SiN<x> or SiO<x>N<y> with thickness of greater than 2,000-angstrom; and S4, manufacturing a layer of inorganic material to form a flat layer on the barrier layer through a bias sputtering method, removingconcave and convex points from the surface of the whole flexible material layer to realize an isoplanar structure. According to the manufacturing method, after the barrier layer is completely formed,the inorganic flat layer is manufactured by the bias sputtering method; and the tiny concave and convex points on the surface of the flexible material layer can be eliminated through etching and re-sputtering effects, so that electrode wiring smooth transition can be facilitated, post processing can be reduced, and the electrode wire breaking probability in device bending can be lowered.

The invention discloses a throttling structure and a pressure drop device. The throttling structure comprises a valve needle, a valve body and a valve seat core, wherein the valve seat core is fixed to the valve body. A through hole in smooth transition is formed in the valve seat core and is matched with the valve needle in shape. The valve needle is inserted into the through hole and forms a throttling round ring with the through hole. The pressure drop device comprises the throttling structure. The throttling structure and the pressure drop device achieve two-stage throttling, and therefore good and smooth transition of the differential pressure change before throttling and after throttling is guaranteed, the possibility of two phase caused when liquid refrigerating fluid flows through a throttling hole is reduced, and the heat exchange efficiency of a system is improved. Meanwhile, the possibility of turbulence vortex forming in the downstream of the throttling hole and dropping is reduced, related noise problems are avoided, and the noise quality of products can be improved.

The invention relates to a construction method for track concrete. The method comprises the following step: after the completion of the concrete jetting of tracks, scraping off floating materials andexcess sprayed materials on the track surfaces, and sequentially scraping the surface concrete of each track to be level with a leveling pipe on the track; carrying out primary smoothing leveling on the track surfaces; after the primary smoothing leveling is completed, removing upper cornice templates and lower cornice templates of the tracks; processing the upper cornice templates and lower cornice templates; and taking out the leveling pipes to carry out filling according to the state of the concrete on the tracks; and after the space left by the leveling pipes is filled up, performing secondary smoothing leveling on the track surfaces and carrying out a brushing process on the track surfaces. The method of the invention makes the concrete surface of the spatial hyperboloid track denser,and the overall smooth transition of the track is realized and the quality and construction efficiency of the track are improved.

The invention discloses a user plane treatment method when using data forwarding mechanism and data multicast mechanism during switch process. The invention sets a time label for a sent data packet, thereby ensuring all nodes can synchronously send the same data to the terminal, increasing switch speed, reducing data delay brought by switch, and the method is good for the seamless transition during switch process. The invention also discloses a core network and a base station for realizing the user plane treatment method, which can improve service transmission quality, increase switch speed and effectively ensure switch quality.

To realize access to the 3G service via 2G system, the invention discloses a transmission method for 3G mobile communication service under dual mode. Firstly, system establishes an audio information platform for converting 3G mobile communication service into audio service; then, the audio information platform provides audio signal access point and coverts the 3G mobile communication service into audio service in the audio signal access point; finally, mobile terminal obtains the audio service via the 2G mobile communication system according to the audio signal access point, and obtains the 3G mobile communication content from the audio service. The invention realizes smooth transition from the 2G system to 3G system.

The embodiment of the invention discloses a DMR (Digital Mobile Radio) base station, a radio access network and a broadband multimedia trunked communication system. The DMR base station comprises at least a DMR-CHU (DMR Channel Unit), an MSU (Medium-rate Service Unit) and a RANC (Radio Access Network Controller) all of which are applied to the broadband multimedia trunked communication system, wherein the DMR-CHU and the MSU occupy different channel resources; the DMR-CHU and the RANC communicate with each other and forward a service control signaling and DMR narrowband data to the RANC and / or a terminal; a medium-rate service transmission channel is built between the MSU and the RANC to forward the medium-rate service data to the RANC and / or the terminal; a medium-rate service transmission channel is built by the RANC to forward the medium-rate service data to the MSU and / or an SCC (Switching Control Center), allocate DMR channels and forward the service control signaling and the DMR narrowband data to the DMR-CHU and / or the SCC. According to the embodiment of the invention, the conventional DMR base station can be enlarged; and the enlarged DMR base station not only can support DMR narrowband services, but also can support the medium-rate services.

The invention relates to a blow molding device for plastic boxes. The blow molding device comprises a left mold base and a right mold base which can move oppositely, wherein the bottoms of the left mold base and the right mold base are provided with mold base bottom plates respectively, a left half mold and a right half mold are arranged on the opposite end surfaces of the left mold base and the right mold base respectively, a left cavity and a right cavity which are the same as a left fuel tank and a right fuel tank in shape and size are formed on the opposite end surfaces of the left half mold and the right half mold respectively, material clamping devices are arranged on the left mold base and the right mold base respectively, the material clamping devices comprise material clamping plates respectively, the material clamping plates can stretch out oppositely to clamp a parison, the upper surface of the material clamping plate is closely attached to the bottom wall of the corresponding half mold and is driven by a material clamping plate driving cylinder, the material clamping plate driving cylinders are fixed on material clamping device bases respectively, the material clamping device bases are arranged on the mold base bottom plates respectively; when the material clamping plate stretches out, the material clamping device base is locked, and the material clamping device base can rotate during mold assembly, so that the material clamping plate can be prevented from damage. The blow molding device for the plastic boxes can reduce the flash height after the box is formed and improve the utilization rate of the parison.

The invention discloses a round bend type transformer tank cover used for a transformer tank. The transformer tank cover covers the transformer tank and is a square cover plate. The four sides of the tank cover are all located on the outer side of the side wall of the transformer tank, downward round bend is conducted on the four edges of the tank cover to form four flanges, the bent portions, provided with the flanges, of the cover plate are all located on the outer side of the side wall of the transformer tank, the four flanges are welded to the outer side face of the tank cover and connected into a whole, and joints are eliminated. The flanges are formed through round bend, damage to a steel plate antirust layer is reduced, the bent flanges are reasonable in size, the flanges can well protect a sealing rubber strip, and therefore the strength of the cover plate can be improved.

The invention discloses an NFC communication method, an intelligent information terminal, an intelligent terminal and an NFC communication system. The NFC communication method includes the following steps that: an NFC long-connection link with an intelligent terminal is built; an original data packet is split into a plurality of sub packets; and the sub data packets are sequentially transmitted to the intelligent terminal through the NFC long-connection link, so that the intelligent terminal receives all the sub data packets and integrates all the received sub data packets into the original data packet. With the NFC communication method provided by the technical schemes of the invention adopted, a large-capacity original data packet can be sent to the intelligent terminal only based on an NFC chip. According to the NFC communication method of the invention, the transmission of the original data packet is only based on the NFC protocol, and thus the method has high security. In addition, the NFC communication method is not only applicable to intelligent terminals with NFC chips and is also applicable to intelligent terminals without NFC chips, and therefore, limitations of terminals and environmental factors can be eliminated, and thus, the NFC use modes of the users of the intelligent terminals without NFC chips can be effectively extended, and the smooth transition of the users can be benefitted.

The present invention provides a logic channel distribution method when a digital multimedia wireless radio employs the frequency hopping transmission. The logic channel distribution problem when the digital multimedia wireless radio employs the frequency hopping transmission is modeled to be a coloring problem; a coloring subgraph is constructed; the current coloring subgraph is colored, and it is determined whether the coloring is successful or not; if the coloring is not successful, when the parameters of the current coloring subgraph can be regulated, the parameters of the current coloring subgraph is regulated, and the coloring subgraph is reconstructed; if the coloring is successful, the logic channel distribution is successful; and if one coloring subgraph is failed, the logic channel distribution is failed. The logic channel distribution method when a digital multimedia wireless radio employs the frequency hopping transmission allows the time interval of the frames of the same logic channel from the same type of the radio on each carrier frequency to be larger than the frequency hopping protection time so as to allow the radio frames in the same logic channel set to satisfy the requirement of the frequency hopping protection time on multiple carrier frequencies.

The invention relates to an elastic bending tool for femoral intramedullary nails, comprising a base; a presser block is arranged above a bending station; a forming surface is provided with a pressergroove; left and right support plates that are rotatable are arranged between two mounting side plates; the left end of the left support plate is rotationally connected with the two mounting side plates through pins; a left spring is arranged blow the right end of the left support plate; the right end of the right support plate is rotationally connected with the mounting side plates via pins; a right spring is arranged below the left end of the right support plate; a retaining plate is arranged in the middle of each mounting side plate; the left support plate is provided with a left support wheel; a right support wheel is arranged on the right support plate; the left of the left support plate is provided with a clamping device to clamp the proximal end of an intramedullary nail; during operation, an intramedullary nail to be bent is placed on the clamping device, the left support wheel and the right support wheel; the two support plates may form obtuse structure when the intramedullarynail is under pressure; the two support wheels can be rotated and spread such that smooth transitional forming is achieved for the intramedullary nail.

The invention discloses a switch method for user terminals to participate in switch decisions, including the following steps: at first, the source base station chooses a group of down node-sets according to the measurement information, and then during switch, the user terminal chooses an optimized switch target from former down node-sets chosen by the resource base station according to present measurement information. The invention realizes macro-diversity of downstream data during switch preparation stage, which not only solves the problem that UE is easily dropped during switch process, butalso brings diversity gain, improves service quality effectively, increases switch speed. The invention also discloses a system, a base station and use terminal for user terminal to participate switch decision. Because the target switch channel is independently chosen by user terminal during switch according to the invention, it can be more accurate to switch to a perfect target channel in the situation of rapidly changed wireless environment, thereby ensuring the switch quality of switch effectively.

The invention discloses a sports shoe sole supporting piece, a sports shoe sole and a sports shoe. The sneaker sole supporting piece is applied to a sneaker sole, is of a thin plate structure extending in the length direction of the sneaker, and is provided with a bent section at least used for corresponding to the metatarsophalangeal joint part of the foot of a human body; the bent section is concave downwards in the width direction to be arc-shaped. The sneaker sole comprises a midsole, and the sneaker sole supporting piece is arranged in the midsole. The sneaker comprises the sneaker sole and a vamp fixedly connected with the sneaker sole. By the adoption of the technical scheme, the metatarsophalangeal joints can obtain larger energy feedback in the process from dorsal flexion to plantar flexion when an athlete runs, the carbon plate is good in boosting effect and acceleration effect in the athlete movement process, and the economical efficiency is good when the athlete runs.

The invention discloses an NFC communication method, an intelligent information terminal, an intelligent terminal and an NFC communication system, wherein the NFC communication method includes: establishing an NFC long connection link with an intelligent terminal; splitting an original data packet into several sub-data packets: Each sub-data packet is sent to the smart terminal sequentially through the NFC long connection link, so that the smart terminal receives all the sub-data packets and integrates all the received sub-data packets into an original data packet. The technical scheme of the present invention can realize sending large-capacity original data packets to intelligent terminals only based on the NFC chip. In the present invention, because the transmission of the original data packet is only based on the NFC protocol, it has relatively high security. In addition, the NFC communication method is not only applicable to smart terminals with NFC chips, but also to smart terminals without NFC chips, thus breaking through the limitations of terminals and environmental factors, and effectively expanding the NFC capabilities of smart terminal users without NFC chips. The usage mode is conducive to the smooth transition of the user.

The invention relates to a blockchain system for realizing decentralization of a blockchain data structure to avoid data bifurcation based on space coordinate introduction, and the blockchain system comprises a block head and a block body, according to the system, a block creation spatial data information module and an enhanced block Hash value information module are added on the basis of an original decentralized blockchain system, and a spatial coordinate and coordinate verification mechanism is added, so that a dual calibration function of time and spatial information of blockchain data isrealized. The invention also relates to a processing method for avoiding data bifurcation of a decentralized blockchain data structure introduced based on space coordinates by using the blockchain system. By adopting the blockchain system for realizing the decentralized blockchain data structure based on the spatial coordinate introduction to avoid the generation of data bifurcation and the processing method of the blockchain system, multi-player data aggregation is realized through a space-time synchronous aggregation authentication mechanism, and the major security problem that the decentralized blockchain data is bifurcated is solved.

A system and method for realizing dynamic allocation of broadband and narrowband resources based on a narrowband air interface belongs to the technical field of trunking communication. The present invention aims to solve the problems of slow response of call establishment and low utilization rate of broadband resources when PDT air interface short messages are used to carry control information in the existing service realization method of broadband and narrowband access integration. The system includes a converged base station and a terminal, and information exchange between the converged base station and the terminal is carried out wirelessly; the converged base station includes a cluster base station controller, multiple PDT base station channel units and broadband service units; methods include call establishment, call process control The broadband service unit is added to the original PDT base station, and the signaling interaction of the broadband and narrowband services is performed through the PDT air interface signaling extension to realize the dynamic allocation of broadband and narrowband resources. The invention is used to realize the dynamic allocation of broadband and narrowband resources.

The invention provides an imaging lens group. The imaging lens group comprises a first lens with positive focal power, the object side surface of the first lens is a convex surface, and the imaging side surface of the first lens is a concave surface; the object side surface of the second lens is a convex surface, and the imaging side surface of the second lens is a concave surface; the object side surface of the third lens is a concave surface, and the imaging side surface of the third lens is a convex surface; the object side surface of the fourth lens is a convex surface, and the imaging side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the imaging side surface of the fifth lens is a concave surface; the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the half ImgH of the diagonal length of an effective pixel area on the imaging surface meet the following condition: TTL / ImgHlt; 1.3, 2, 3; the abbe number V1 of the first lens, the abbe number V3 of the third lens and the abbe number V5 of the fifth lens meet the following condition: 70lt; (V1 + V3 + V5) / 3lt; 85). The imaging lens group solves the problem that the imaging lens group in the prior art is difficult to give consideration to large image plane, large aperture and good chromatic aberration at the same time.

This application discloses an optimized power transmission right distribution method and device, the method includes: according to the preset time distribution coefficient, the preset unit distribution coefficient and the total power value of the power transmission right assigned by the system's annual total power generation computer group; combined with the power transmission right The total power value, the preset proportional coefficient and the preset time are used to calculate the distribution of power transmission rights of the generator set; the total distribution income of transmission rights is calculated according to the distribution of power transmission rights; it is calculated through the preset node electricity price, node power generation and node power consumption The total congestion surplus; when the total congestion surplus is less than the total distribution revenue, adjust the distribution of transmission rights to obtain the optimized distribution of transmission rights. The present application solves the technical problem that the existing technology does not consider the impact of the congestion surplus on the distribution of power transmission rights, which leads to the unstable development of the power supply market.

The embodiment of the invention discloses a DMR (Digital Mobile Radio) base station, a radio access network and a broadband multimedia trunked communication system. The DMR base station comprises at least a DMR-CHU (DMR Channel Unit), an MSU (Medium-rate Service Unit) and a RANC (Radio Access Network Controller) all of which are applied to the broadband multimedia trunked communication system, wherein the DMR-CHU and the MSU occupy different channel resources; the DMR-CHU and the RANC communicate with each other and forward a service control signaling and DMR narrowband data to the RANC and / or a terminal; a medium-rate service transmission channel is built between the MSU and the RANC to forward the medium-rate service data to the RANC and / or the terminal; a medium-rate service transmission channel is built by the RANC to forward the medium-rate service data to the MSU and / or an SCC (Switching Control Center), allocate DMR channels and forward the service control signaling and the DMR narrowband data to the DMR-CHU and / or the SCC. According to the embodiment of the invention, the conventional DMR base station can be enlarged; and the enlarged DMR base station not only can support DMR narrowband services, but also can support the medium-rate services.

The invention discloses a mixed-flow water turbine draft tube with an inclined bent cone. The draft tube is sequentially composed of an inclined bent cone section unit, an elbow section unit and a diffusion section unit, wherein the central axes of the inclined bent cone section unit, the elbow section unit and the diffusion section unit, the upstream side contour line and the downstream side contour line of the inclined bent cone section unit, the upstream side contour line and the downstream side contour line of the elbow section unit and the top contour line and the bottom contour line of the diffusion section unit conform to an exponential curve y = a + b * e (cx), wherein a, b and c are all undetermined constants, and the values a, b and c of different lines of different units are different, so that the fluid flow state in the draft tube is the best, and the vortex strip is the minimum. The spiral symmetrical structure or the cylindrical symmetrical structure of the vortex strip of the draft tube is destroyed through the asymmetric design of the inclined bent cone, generation of the vortex strip of the draft tube is effectively simulated, then pressure pulsation is reduced, and the operation and output stability of the water turbine is improved.