124results about How to "Reduce Design Risk" patented technology

The invention discloses a true random number generator, comprising a stochastic source module and a post-processing module. The stochastic source module is used for generating digital signals having random characteristics and providing the digital signals for the post-processing module; the post-processing module carries out post-processing for the digital signals by using a loop code error-correcting method, thereby eliminating bias of data signals to obtain random number series. The stochastic source module can be composed of a plurality of sets of inverter oscillating rings, and the post-processing module is realized by a linear feedback shift register (LFSR). The TRNG (True Random Number Generator) has simple structure and only general digital logic devices are used, so the true random number generator has good technology weak correlation and can be rapidly transplanted in an integrated circuit design flow after prototype verification is carried out, thereby improving the efficiency of module design and reducing the development risk.

The invention provides a synchronous dual-port memory IP based method for realizing the concurrent-read and concurrent-write operation. In the IP of the synchronous dual-port memory, when the reading and writing operation is performed on the same address at the same time, a reading and writing conflict at ports appears, so errors occur in the reading and writing operation. The method solves the problem of reading and writing conflict at the ports with a selective reading and writing control strategy and realizes the operation of reading original data in a memory first and then writing new data into the address in the same period. The method has the advantage of effectively solving the problem of reading and writing conflict at the ports of a dual-port memory; besides, a memory system withrelatively stable performance can be obtained by designing in the method; and the whole design can be realized by an automated tool, and the design is portable, so the development cycle of a product can be shortened.

The invention provides a traction sleeper buffer device of an all-aluminum railway vehicle and belongs to the field of traction sleeper buffer devices for railway vehicles. The traction sleeper bufferdevice comprises a sleeper beam, a traction beam, a drag gear installation seat and two buffer beams. A lower traction beam cover board and lower buffer beam cover boards of the traction sleeper buffer device are all made of an EN AW 5083 type aluminum plate material which is low in density, low in weight and good in bending performance, the drag gear installation seat is made from EN AW 6005A aluminum plates high in yield stress, other straight plate structures are all made of an EN AW 6082 type aluminum plate material high in yield stress, so that the overall selected materials of the traction sleeper buffer device meet the strength standard, and the welding and manufacturing processing property of the traction sleeper buffer device is the best. All lightening holes can be used as auxiliary holes at the same time in the inner cavity welding operation process, and therefore the accessibility and welding quality of an inner cavity welding joint are improved.

The present invention proposes a hardware-in-the-loop simulation resource interface adapter for an aircraft control system, including a resource configuration management module, an analog array switch module, a signal processing module, and a reconfigurable equivalent; the resource configuration management module controls the The analog array switch performs channel selection, and schedules and manages the data exchange content of the real-time simulation network; the analog array switch module is used to switch between sub-components, reconfigurable equivalents and various simulation devices of the aircraft control system; The signal processing module performs signal conversion on the sub-components of the aircraft control system and the input and output signals of the reconfigurable equivalent device; the reconfigurable equivalent device performs equivalent simulation of each component of the aircraft control system or the external environment required for simulation. The invention can realize flexible configuration and switching in different development stages, different simulation test modes and different control schemes, and has great application potential in ground hardware-in-the-loop simulation systems of aircraft control systems.

The invention provides a computer cryogenic reinforced system, comprising a singlechip used for controlling the operation of a flush bonding controller in low temperature environment; a plurality of data interfaces and a plurality of general input / output base pins; a plurality of sensors which are used for measuring the temperature of a plurality of different positions and are connected with the singlechip through one data interface of the singlechip; the flush bonding controller is connected with the singlechip through one data interface, transmits the signal indicating a normal working state to the singlechip through the data interface, and receives a boot-strap signal and a reset signal through the general input / output base pins of the singlechip; a flush bonding controller electric control module is used for supplying electricity for the flush bonding controller and is controlled by the singlechip through the general input / output base pins; a flush bonding controller heating control module is used for heating the flush bonding controller and is controlled by the singlechip through the general input / output base pins. The singlechip chip is an industry chip while other chips in the computer system are commerce chips.

The invention provides an encoding / decoding storage system with scalable input bit width. The encoding / decoding storage system comprises a read and write control circuit, a memorizer, an encoding circuit, a data cache device, a first-level address buffer, a second-level address buffer, first-level write enable buffer, a second-level write enable buffer and a control circuit, wherein the first-level address buffer is cascaded with the second-level address buffer; the first-level write enable buffer is cascaded with the second-level write enable buffer. According to the encoding / decoding storage system, a cache encoding / decoding mechanism is adopted, so that interactive storage between storage array and the buffers can be realized; when the bit width of the data which needs to be written in and externally provided can not meet the requirement on the memorizer, namely, part of coded data comes from the external input, and the other part of the coded data comes from the storage array, accurate encoding and decoding can be realized; furthermore, the error correcting capabilities are consistent under the condition of different bit widths, so that normal write-in and read-out operation can be carried out on the storage array.

The invention discloses a method for removing intersymbol interference and a decision feedback sequence predicator, and relates to the technical field of communication. The method comprises the steps of receiving an input signal through an intersymbol interference forming filter; processing the input signal to change the tap energy distribution of intersymbol interference to obtain a first output signal; receiving the first output signal through an improved feed-forward equalizer; removing all taps of a forebody ISI and a first tap of an afterbody ISI in the first output signal to obtain a second output signal; receiving the second output signal through an improved decision feedback equalizer; removing the u+1 to u+m taps of the afterbody ISI in the second output signal to obtain a third output signal; receiving the third output signal through a parallel decision feedback decoder to perform viterbi decoding; removing the second to the u taps of the afterbody ISI in the third output signal to obtain a target signal. The method is generally applied to the specific achievement of an 10000BASE-T physical layer chip.

The invention provides a method for simulating a motion curve of an automobile front steering wheel. The method comprises the steps that a wheel jumping and steering first coupling relation curve of the automobile front steering wheel is obtained; a wheel jumping and steering second coupling relation curve considering elastic piece deformation of the front steering wheel is obtained; a wheel jumping and steering final coupling relation curve of the automobile front steering wheel is obtained by combining the first coupling relation curve and the second coupling relation curve; a motion curve file of the front steering wheel is generated according to the final coupling relation curve. The invention further provides a method for manufacturing an envelope surface of the automobile steering wheel. The obtained motion curve of the front steering wheel can reflect a wheel track more accurately, and the reflection is more close to the actual situation; the obtained envelope surface has high reliability and safety.

The invention relates to a new energy resource automobile battery replacing system. The new energy resource automobile battery replacing system structurally comprises a battery storage system 1, an intelligent charging system 2, battery cleaning systems 3, a battery disassembling and assembling system 4, terminal service charging systems 5, an automobile transfer system 6, a battery allocation system 7, a background software management system 8 and a multilayer warehouse, wherein the battery storage system 1 is mounted in the multilayer warehouse and is connected with the battery disassembling and assembling system 4; the battery cleaning systems 3 are arranged between the battery storage system 1 and the battery disassembling and assembling system 4, a fire control device, a ventilation device and a monitoring video recording device are respectively arranged in the multilayer warehouse, and a fire control device, a ventilation device and a monitoring video recording device are respectively arranged in the battery disassembling and assembling system 4; the background software management system 8 is arranged in the terminal service charging system 5. The new energy resource automobile battery replacing system has the advantages that a standard battery module is effectively charged by off-peak electricity, waste battery module management is standardized, and the problems of potential safety hazards, long waiting time and the like caused by a charging pile are solved in the manner that battery modules are replaced and charged along with the automobile, so that the purposes of being energy-saving and environmentally-friendly are realized.

The invention relates to a method for architectural design by utilizing simplified models and unstructured grids. The method includes: necessarily simplifying cumbersome steps during the architectural design; making the simplified building models through software inside a building and taking the detected building as a large space grid; inputting building information and environment information into a computer for simulation of the building environment and the humidity environment to acquire data of the unstructured grids of the whole building; calculating each space building grid according to the acquired data; analyzing functional arrangement of the building as required and integrally concentrating functional zones identical in attribute as far as possible to enable the building to be standard and vertical. By the method, convenience in observation of an internal structure of the building facilitates knowledge of external environment characteristics, so that a designer can observe, study and work out good works conveniently and rapidly.

User equipment (16) is configured for operation in a narrowband wireless communication system (10). The user equipment (16) is configured to detect receipt of a narrowband positioning reference signal(20) that comprises a narrowband reference signal sequence. The narrowband reference signal sequence is a subsequence of a wideband reference signal sequence. The wideband reference signal sequence is configured for a wideband frequency bandwidth that is wider than a maximum frequency bandwidth defined for the narrowband wireless communication system (10). The user equipment (16) is also configured to perform a positioning measurement using the narrowband positioning reference signal (20).

The invention discloses a quick assessment method for site selection of an underground powerhouse cavern of a hydropower station, relates to the field of hydraulic and hydroelectric engineering, and provides an assessment method capable of objectively and quickly judging the site selection condition of an underground powerhouse cavern of a hydropower station. The method comprises the following steps: A, summarizing and classifying factors influencing site selection to obtain factor sets; B, endowing each factor set with a total score according to the influence degree on site selection, and distributing the total score of each factor set to factors of the factor set to obtain a total score of each factor; C, determining the actual score of each factor according to the difference between the actual condition and the ideal condition of each factor; and D, calculating the actual score sum of each factor, and judging whether the target address is suitable for building the underground powerhouse cavern according to the difference between the score sum and the total score. By adopting the method, numerous factors involved in site selection of the traditional underground powerhouse cavern are quantified and unified in the same assessment system for assessing via a large amount of existing engineering examples and numerical analysis results.

The invention relates to a BitMap high-speed fuzzy search method, which comprises the following steps: establishing and issuing rule table entries by software, namely dividing a required quintuple combination into an AVL tree; each AVL tree storing rule nodes according to the principle that the accurate matching priority is the highest, the higher the fuzzy matching precision being, the higher thepriority being, and linearly arranging the intra-blocks and the inter-blocks according to the priority; carrying out linear arrangement according to priorities, establishing a Bitmap lookup table, and carrying out quintuple information segmentation to establish a lookup index; when the Bitmap is updated, a plurality of combinations needing to be matched according to the mask; generating an indexKey based on the rule table entry information, and then segmenting the index Key into a plurality of sub-Keys; and looking up the quintuple of the IP network message according to the index key. According to the method, the table writing and looking-up mode of a content fuzzy looking-up mode is improved, logic resources are saved, the logic processing rate is increased, meanwhile, multiple instantiation extensions are conducted in a modular mode, resources can be estimated, convenience and rapidness are achieved, and the design risk is reduced.

The invention discloses a design method for rapidly changing the electrical properties of a through hole in a PCB (Printed Circuit Board). The design method disclosed by the invention comprises the following steps: writing an Skill program by using CADENCEAXLSKILL language, putting the written Skill program into a wiring tool installation file, executing the Skill program, selecting the through hole, the electrical properties of which need to be changed, and simultaneously, appointing names of the electrical properties to be changed, so that the properties of the selected through hole are changed into required electrical properties. Original artificial and mechanical fussy operation is changed into very simple automatic one-key operation; therefore, the working efficiency of wiring design engineers is increased to a great extent; and simultaneously, the design risk is also greatly reduced.

The invention discloses a high-speed security encryption Micro SD card which comprises an SD interface chip, a security chip and a storage chip. An SD interface module and a storage controller are integrated in the SD interface chip; a cryptographic algorithm module, a COS module, a cryptographic algorithm accelerator and a bit operation accelerator are integrated in the security chip; and a storage module is integrated in the storage chip. The system also comprises an HSSPI interface and a DMA module, wherein the HSSPI main equipment is integrated in the SD interface chip; and the HSSPI slavedevice and the DMA module are integrated in the security chip. According to the invention, the data transmission rate can be increased, and the password operation processing rate can be effectively improved.

The invention provides a realization method based on unification of a heat-force-electromagnetic field network. The realization method comprises: step 1: performing finite element mesh dividing on a model by using thermal analysis software, so as to obtain a thermal coupling grid of the model; step 2: converting a file format of the thermal coupling grid of the model into a file format which can be identified by electromagnetic software; and step 3: inputting the converted thermal coupling grid file to the electromagnetic software, and performing analysis to obtain thermal field distribution data of the model, so as to obtain an electromagnetic data distribution pattern that is based on temperature field distribution and deformation. According to the realization method provided by the invention, the heat-force-electromagnetic field network is unified; a design scheme can be simulated and verified more accurately and more effectively; system performance is ensured; and a design risk is reduced.

The invention provides a method for determining the burnout height of a combustion chamber of a pulverized coal boiler. The method comprises the steps as follows: Step 1: a high-altitude environment is simulated, and combustion characteristic parameters of fire coal in the high-altitude state are acquired through a combustion test of the fire coal on a test bed; Step 2: according to the characteristic parameters, the correlation between the carbon content of coal-fired fly ash of the fire coal and the dwell time of pulverized coal of the fire coal in the boiler is obtained; Step 3: according to the correlation between the carbon content of the fly ash and the dwell time of the pulverized coal in the boiler, the dwell time value, corresponding to the limit value, required to be reached during actual boiler design, of the carbon content of the fly ash, of the pulverized coal in the boiler is obtained, and the burnout height of the combustion chamber is obtained in combination with the flue gas velocity of the pulverized coal in the combustion chamber. With the method for determining the burnout height, the boiler design in a high-altitude area has more scientific bases, the problems of high carbon content of the fly ash and low boiler combustion efficiency due to insufficient burnout time which is possibly caused by the fact that the burnout height of a boiler in the high-altitude area is determined as per the empirical formula only are solved, and the boiler design risk is effectively reduced.

A memory cell for reducing the cost and complexity of modifying a revision identifier (ID) or default register values associated with an integrated circuit (IC) chip, and a method for manufacturing the same. The cell, which may be termed a “Meta-Memory Cell” (MMCEL), is implemented on metal layers only and utilizes a dual parallel metal ladder structure that traverses and covers each metal and via layer from the bottom to the top of the metal layer structure of the chip. One of the metal ladders is connected to a power supply at the bottom metal layer, corresponding to a logic 1, and another metal ladder is connected to ground at the bottom metal layer, corresponding to a logic 0. The output of the MMCEL can thus be inverted at any metal or via layer and can be inverted as often as required. Significant cost savings are achieved because a revision ID or default register bits may be modified by altering only those metal layers where design changes are necessary.

The invention discloses a method for adaptively improving signal quality based on a redriver parameter. The method comprises the steps of finding a best redriver parameter of each link and storing theparameter in a system; after the system is cascaded, judging a connected link of a signal source; and setting a parameter of a redriver chip as a redriver parameter corresponding to the connected link. According to the method, it is ensured that the chip can perform redriver parameter optimization selection according to a topology type, and the method optimizes the signal quality, reduces the risk of link design, avoids manual refresh operations by users according to different links and reduces unnecessary time and cost costs. The system design success rate is improved.

The invention discloses a method for selecting the axis of a large cavern under a high ground stress condition, and belongs to the field of water conservancy and hydropower engineering. The method for selecting the axis of the large cavern under the high ground stress condition comprises the following steps that firstly, engineering geological investigation is conducted according to the scale of the underground cavern needing to be excavated, and thus actually-measured ground stress data and main structural surface characteristics of rock mass of the area where the cavern is located are obtained; secondly, different cavern axis determining methods are selected according to different ground stress levels; and finally, the axis of the cavern is determined with the direction of the maximum horizontal stress as the reference standard, and a small angle is formed between the axis of the cavern and the direction of the maximum horizontal stress. According to the method for selecting the axis of the large cavern under the high ground stress condition, the axis of the cavern is determined with the direction of the maximum horizontal stress as the reference standard through theoretical calculation, comprehensive analysis and experimental verification under the high ground stress condition and particularly under the condition that the maximum main stress angle is large, so that the self-stabilizing capacity of the rock mass around is made higher, the design risk can be greatly lowered accordingly, the number of support measures is reduced, and the purposes of economy and safety are achieved.

The invention belongs to the technical field of structure / strength test and relates to an aircraft structural load transmission characteristic model test designing method. The aircraft structural load transmission characteristic model test designing method comprises the steps of, firstly, determining the scaling ratio of a model craft, and selecting materials identical to the raw materials of a prototype craft, setting a ratio of stress similitude of C sigma=sigma prototype / sigma model, a ratio of strain similitude of C epsilon=epsilon prototype / epsilon model, a ratio of displacement similitude of C delta=delta prototype / delta model, and a ratio of plane force similitude of Cq=q prototype / q model; secondly, according to the theory of similarity and equation analysis methods, deriving the following similarity indexes including a geometric equation of CL*C epsilon / C delta=1, a physical equation of C epsilon / C sigma=1, a force boundary condition of Cq / C sigma=1, a concentrated force of CF / C sigma*C2L=1 and a concentrated moment of CM / C sigma*C3L=1; thirdly, ensuring no change of stress and strain in the prototype craft and the model craft, namely, C epsilon=1, C sigma=1, F prototype / F model=CF=C2L, M prototype / M model=CM=C3L, and delta prototype / delta model=C delta=CL, and ensuring identical constraints during a model test and exerting the following load of F model=F prototype / C2L, and M model=M prototype / C3L during model test; fourthly, according to physical quantity measured during the model test, inversing the physical quantity of the prototype craft by following the following relations including displacement of delta prototype=delta model CL, strain of epsilon prototype=epsilon model, and stress of sigma prototype=sigma model. The aircraft structural load transmission characteristic model test designing method can accurately and rapidly evaluate structural load transmission characteristics and reduce the design risk during aircraft scheme approachment.

The invention provides a gas mask part assembly process analysis method. By using a finite element method, the gas mask part assembly process is subjected to simulation analysis, and the simulation process comprises three parts of pretreatment, solution and aftertreatment. Pretreatment mainly comprises introduction of a gas mask part three-dimensional model, building of a rubber cover body material model, dividing of computing grids and setting of contact conditions; during solution, firstly boundary conditions and loads of the model are set, and then a parallel operational model of a computeris utilized to solve the model; during aftertreatment, characteristics of a simulation result are extracted, and a graph is drawn and analyzed. By means of the gas mask part assembly process analysismethod, deformation and stress of the gas mask super-elastic material in the assembly process can be obtained, and the reliability of assembly of the gas mask is evaluated.

The invention provides a static and dynamic performance design method of a closed high-speed water lubrication dynamic pressure spiral groove thrust bearing, which comprises the following steps of establishing a closed high-speed water lubrication dynamic pressure spiral groove thrust bearing lubrication model by considering the coupling effect of multiple factors such as cavitation effect, centrifugal effect, turbulence effect, heat effect and the like, and analyzing and calculating the static and dynamic performances of the closed high-speed water lubrication dynamic pressure spiral groove thrust bearing. A static and dynamic performance design of a closed high-speed water lubrication dynamic pressure spiral groove thrust bearing is achieved, so as to obtain bearing capacity and axial rigidity as large as possible and always keep forward flow. By the adoption of the static and dynamic performance design method for the closed high-speed water lubrication dynamic pressure spiral groovethrust bearing, the static and dynamic performance design precision of the bearing can be greatly improved, the research and development period is shortened, and an effective way is provided for performance analysis and engineering design of the bearing.

The invention discloses a ZedBoard-based method for remote monitoring of circuit operation in an FPGA, wherein a user's circuit is downloaded into programmable logic of a ZedBoard development board in the form of a .bit file; an operation system is started on a processing system, and the user's circuit is operated in the programmable logic; an Ethernet port located at the processing system end is used to receive control information sent by the user and transmit the information to the user's circuit in order to control work of the user's circuit; and results of the circuit operation are sent to a client side of the user by the Ethernet port located at the processing system end. The ZedBoard-based method for the remote monitoring of the circuit operation in the FPGA provided by the invention can obtain situations of the circuit of a server end operated in the FPGA of a hardware test platform at the client side and send control commands of the client side to the hardware platform of the server end in order to control the circuit.

The invention is suitable for the design field of printed circuit board (PCB) boards and provides a short connection method and a PCB pad package for different networks. PCB pad packages of two pins are in short connection. The short connection method achieves the conduction of two different networks based on the principle design of the PCB boards, reduces design risks caused by manually covering copper foils in design of the PCB boards, achieves conduction from the principle design to have the fool-proof function, and simultaneously prevents part material cost and part paster cost from increasing due to series connection of zero ohmic resistors or magnetic beads in a traditional method.

The invention discloses a reverse conducting integrated gate commutated thyristor, which comprises a GCT (Gate Commuted Tryristor), an FRD (Fast Recovery Diode), and an isolation region between the GCT and the FRD, wherein the GCT comprises a cathode N+ doped region of the GCT, a P-type base region of the GCT, an N-substrate, an N' Buffer layer, and a P+ anode region of the GCT successively from top to bottom in the longitudinal direction; the FRD comprises a P-type base region of the FRD, the N-substrate, the N' buffer layer, and an N+ cathode region of the FRD successively from top to bottom in the longitudinal direction; the N' buffer layer is an N' buffer layer shared by the GCT and the FRD; and the upper surface of the isolation region is lightly doped with a layer of N' impurity, and the doping concentration of the N' impurity is 1-2 orders of magnitudes higher than that of the N-substrate. According to the invention, using the compensating effect of the impurity, under the condition that the P-type doping distribution of the isolation region is not changed, the effective width of the isolation region is increased, and the shortcomings existing in the prior art that the diffusion control precision is not high, and the process is complicated and not suitable for high pressure devices are overcome.

The invention relates to a simulation system for equipment design. The simulation system comprises hardware equipment and a software system, wherein the software system comprises a virtual reality editor and a VRP-IE (Virtual Reality Platform Internet Explorer) used for converting a three-dimensional file into a file capable of being browsed in an internet explorer; the hardware equipment comprises a processing system, a three-dimensional display system and an interactive device. The contributions of the simulation system for the equipment design provided by the invention lie in that the simulation system can help to realize the design and release of products and realize the evaluation and audit of design; help designers to modify design proposals timely and conveniently; save the research and development cost and accelerate the research and development speed; realize interaction between virtual scenes and users; go deep into the interiors of products to carefully observe the structures of the products and can realize the functions like virtual assemblies of products, internet release of products, etc. and reduce the wasting of resources and research and development cycle of enterprises in the process of equipment design to the maximum extent.

The invention relates to a modular CMOS imaging system, which aims to solve such problems as a large designing workload, a long processing cycle and high cost of the conventional imaging system of CMOS image sensors. The modular CMOS imaging system comprises a CMOS image sensor focal plane unit and a video processing unit, wherein the CMOS image sensor focal plane unit and the video processing unit are connected through a connector; and the CMOS image sensor focal plane unit comprises a CMOS image sensor, a clock switching circuit, a digital signal shaping and level converting circuit, a vertical driving circuit, and a power switching circuit. When the imaging system is applied to different CMOS sensors, only the corresponding CMOS image sensor focal plane units need to be replaced, and replacement of the video processing unit is avoided, so that the work cycle is greatly shortened, the cost is greatly lowered, and the designing risk is reduced; and power supplies of the CMOS image sensors are classified into multiple types, and two or more adjustable power supplies are used to respectively supply power, so that the power efficiency is improved, the total power consumption is reduced, and thermal deformation of an optical-mechanical structure caused by heating of a focal plane sensor is alleviated.

The invention relates to a building design method based on wind speed streamline visualization. The building design method can be used for improving the windheat environment around a building, improving the campus comfort, and reducing the energy consumption of heating and refrigeration; by virtue of certain intelligent operations of a computer, wind speed vector distribution graphs of a wind speed streamline at different height can be obtained, and thus the building design method based on the wind speed streamline visualization is obtained. By virtue of the obtained wind speed vector distribution graphs, the distribution condition can be visually observed. According to the building design method, a middle school in the southern district of China is taken as an example, the wind environment condition of the reconstructed campus is researched; the building design method based on wind speed streamline visualization is used for surveying and researching the wind speed streamline to the greatest extent, better learning the important effect of the wind speed streamline in building design, facilitating building design and promoting harmonious coexistence of human beings and the nature.

The invention discloses a wind power generation blade device with ice removing capacity. The device comprises a wind power generation blade and a front edge wind adjusting mechanism; the front edge wind adjusting mechanism is mounted in the wind power generation blade; the wind power generation blade comprises a blade shell; a back edge web is mounted at the top of the inner wall of the blade shell; a front edge web is mounted on the inner wall of the blade shell and positioned under the back edge web; and a back edge wind baffle plate is mounted on the right side of the back edge web. Throughcooperation of the back edge web, the front edge web, the back edge wind baffle plate, a front edge blade tip web, a blade tip ventilation hole, a ventilation pipe, a front edge wind baffle plate, aheating ventilation device, a wind hole adjusting pressure plate, an adjusting wind hole and a fixed bolt, the wind power generation blade device with the ice removing capacity is realized, the problem of incapability of directly arranging heating elements in a blade tip area of a wind power blade for heating and ice removal is solved, and the problems of higher wind pressure and higher flowing speed of a circulating system when a large-size and large-prebent blade adopts a traditional air heat circulating structure are solved.