56 results about "Structured systems analysis and design method" patented technology

Conventional stripline implementations of couplers in Multilayer Ceramic Integrated Circuit (MCIC) technology incur a cost disadvantage when compared to an equivalent microstrip implementation. This is primarily due to the increased substrate thickness needed to achieve the required performance. Conventional stripline couplers significantly limit our ability to optimise for smaller substrate thickness and therefore overall cost. However, stripline couplers are needed for stacked integration scenarios and as building blocks for complex active and passive RF circuits in MCICs. A method of implementation that overcomes this practical disadvantages is therefore highly desirable. To this end, the present invention presents a novel coupling device structure that enable RF designers to use the stripline coupler configuration, by achieving required levels of performance with much reduced substrate thickness. The invention outlines a structured design procedure and presents simulation results confirming the validity of the technique. In particular, to achieve this, the present invention proposes a coupling device, comprising a substrate 1, a first conductive layer 2 covering a first surface of said substrate 1, at least two electromagnetically coupled lines 3a, 3b being provided opposite to said first surface and being covered by at least one cover layer 4, 5, wherein at least one short-circuit stub Stub A, Stub B is connected between at least one of said electromagnetically coupled lines and said first conductive layer.

The invention discloses an RS485 bus communication method based on a Modbus protocol and a power electronic system based on the communication method. A master controller and slave controllers of the power electronic system communicate through the RS485 bus communication method based on the Modbus protocol. According to the RS485 bus communication method, the structures of communication frames generated by the controllers are defined, and reasonable communication frames and processing logic are defined through structural design of a communication program, which improves the communication efficiency and the utilization rate of an RS485 bus communication system, accelerates the speed of data response, and greatly reduces the transmission delay. The adopted RS485 bus communication system is high in communication reliability, low in cost and easy to implement, and is suitable for application in large-scale power electronic systems.

The invention relate to the technical field of channel coding of a wireless communication system and a satellite communication system, and provides a method for constructing a code-rate compatibility QC-LDPC code on basis of matrix row deletion. The method includes the steps that firstly, on the basis of a GCDg8 algorithm, QC-LDPC codes with a large girth and a low code rate are constructed to serve as primary codes, then successive row deletion of an exponential matrix is carried out to obtain subcodes with a high code rate and an unchanged information bit length, and the short-length problem of code words with a high code rate is avoided; row deletion means that corresponding edges of Tanner graphs corresponding to the primary codes without the short-length problem are deleted, the short-length problem cannot occur, and the girth may increase; ultimately, the subcodes are processed through a hidden technique, the minimal distance of the code words is increased, and performance of the code words is improved. According to the method, the code-rate compatibility QC-LDPC code with structural design is adopted, and compared with an LDPC code constructed in a PEG algorithm, construction is easier to achieve, hardware achievement complexity is not high, and performance is more excellent.

The invention provides a multilayer ultra-wideband wave-absorbing body based on electric loss material and magnetic material combination, and belongs to the technical field of microwave electromagnetic stealth. A wave-absorbing structure comprises six resistance film layers, a magnetic absorption layer, a metal reflection layer and a resistance film interval supporting layer. The six resistance film layers and the magnetic material form a laminated structure; the interval between the every two resistance film layers is T; and the thickness of the magnetic layer is H. The unit structures of theresistance film layers are square array structures with the sizes of L1, L1, L3, L4, L5 and L6 from top to bottom, and the unit period is P. Based on the reasonable structural design of an electric loss material and a magnetic material, the ultra-wideband wave-absorbing effect is achieved, and high-intensity absorption is achieved in certain frequency bands; due to the symmetry of the structure,the structure is insensitive to the polarization of electromagnetic waves; and the broadband large-angle absorption effect is enhanced due to the gradual change design of the multiple resistance layers.

The invention provides a transductor used for a direct-current current transformation valve. The transductor adopts a hollow aluminum pipe as a coil material, and a hollow coil is a cooling water passage which can cool coils and magnetic cores, thereby simplifying the structure of a water path greatly; the coils are winded into an elliptic runway-shaped structure, and the structure of the transductor is more skillful and is convenient to install; the magnetic cores are arranged in a distribution type, and C type magnetic cores at the circumferential directions of the coils are buckled and connected outside the coils in pairs; when an induction value is changed and needs to be regulated by the magnetic cores, only the pair number of the magnetic cores needs to be changed, the appearance size does not need to be changed, and the additional design is also not needed, thereby simplifying the manufacturing process and being beneficial to realizing structure design and industrialization production; and the thickness of air gaps at the buckling and connecting positions of the magnetic cores can be flexibly regulated so as to meet the requirement of electric properties.

The invention discloses a structured injection wall and a construction process thereof. The structured injection wall comprises a transverse light steel joist frame and a vertical light steel joist frame, wherein the end parts of the transverse light steel joist frame are fixed on a column; the end parts of the vertical light steel joist frame are respectively fixed on a floor and a beam bottom; a steel wire plate net is fixed on a bracket structure formed by the transverse light steel joist frame and the vertical light steel joist frame; and slurry is coated on the steel wire plate net. The injection wall realizes structural design, is convenient for construction, realizes the wall lightweight, and facilitates to improve the building earthquake resistance.

The invention provides a force-sensor-based flexible under-actuation mechanical paw and a using method and belongs to the technical field of mechanical structures. The force-sensor-based flexible under-actuation mechanical paw comprises an interface module, a steering engine driving device, an under-actuation transmission device, an interface base, a pressure sensor module and a finger module. Theforce-sensor-based flexible under-actuation mechanical paw is accurate in control, easy to install, structured in design, easy to use and maintain, and capable of being effectively used for various lightweight-level grabbing occasions.

The invention discloses a chain supermarket warehouse management system. A reasonable and effective commodity delivery management system is provided. The main advantages are that the delivery service between each chain store and a delivery center, suppliers and the delivery center and consumers and the delivery center can be effectively solved. The chain supermarket warehouse management system comprises six units of order management, sorting management, delivery management, transportation management, warehouse management and system management. The system is researched and developed for the real working process of the supermarket so that the system is complete in function and high in targeted performance. Meanwhile, a structured design method is adopted, modular and component development of each function point is realized based on the principle of high cohesion and low coupling, the development flow is controlled, the modular structure is optimized, the realization difficulty and complexity are reduced and repeated development cost is reduced so that the readability and maintainability of programs can be enhanced on the basis of realizing each function point of the system.

The invention discloses an order management system for chained supermarket and provides a reasonable and effective commodity delivering and managing system. The system of the invention is advantageous in that it effectively solves the delivering businesses between chained stores and the delivering centers, between suppliers and the delivering centers as well as between the consumers and the delivering centers. The order management system of the invention comprises six units, referred to as the order management unit, the sorting management unit, the delivering management unit, the transporting management unit, the warehouse management unit and the system management unit. The order management system is developed in view of the actual working procedures of supermarkets. And the functions are complete and highly targeted. At the same time, due to the structured design manner and the principle featuring high inner collection and low coupling, the functional points are modularized and are developed in an assembling manner. The development procedures are controlled and an optimized modularized structure is formed so as to reduce the difficulty and complexity for doing the same. The repetitive development cost is also reduced so as to ensure that on the basis of the various functional points, the readability and maintenance of the procedures are increased.

The invention discloses an unmanned aerial vehicle information transmission system based on an FPGA. The system comprises an unmanned aerial vehicle measuring and controlling system and an aircraft. A task loading device is connected between communication links of the unmanned aerial vehicle measuring and controlling system and the aircraft. The unmanned aerial vehicle measuring and controlling system comprises a cooperative airway platform. An input end of the cooperative airway platform is connected with a data link detection unit. An output end of the cooperative airway platform is connected with a flight control unit. The aircraft comprises an FPGA core controller. The output end of the FPGA core controller is connected with a data control station. The output end of the task loading device is connected with an external task loading controller. The task loading device also comprises a loading data memory. The output end of the loading data memory is connected with a loading data detection module and a loading state display module. Through adoption of a layered structural design method, the data transmission system based on a distributed wireless local area network is designed, and the unmanned aerial vehicle system is ensured to work effectively and reliably.

The invention relates to an electronic evidence fixing method, a terminal device and a storage medium. The method comprises the following steps of 1, compressing data information and adding the compressed data information to a buffer queue A; 2, collecting data contents, adding the collected data contents to a buffer queue B, encrypting and compressing the data contents in the buffer queue B, andadding the encrypted and compressed data contents to the buffer queue A; 3, judging whether data blocks in the buffer sequence A meet standardization requirements or not in real time; 4, constructingaddressing list data in the buffer queue A, encrypting the addressing list data, and adding the encrypted addressing list data to an addressing list data region; 5, copying the data blocks in the buffer sequence A to a backup region of a mirror image file; and 6, constructing a file control region in the mirror image file. Through simplified structured design, network resources comprised in computer software and hardware can be effectively and correctly fully utilized in the creation and usage processes of the evidence mirror image file.

The invention discloses a Roots blower pipeline noise reduction device which comprises silencing box and an internal sound absorbing layer wrapped outside a pipeline. The internal sound absorbing layer is disposed in the silencing box. A cavity is formed between the inner wall of the silencing box and the sound absorbing layer. The silencing box, the cavity and the internal sound absorbing layer form a secondary silencing composite structure. The internal sound absorbing layer is three-layered and comprises a galvanized plate, high-density centrifugal glass cotton and low-density centrifugal glass cotton from outside to inside. The silencing box is four-layered and comprises a face protecting layer, a sound insulation layer, a sound absorbing layer and a inner plate form outside to inside. By the secondary silencing composite structure, the problem that inlet-outlet pipeline noise is high and radiation range is wide during operation of a Roots blower is solved, and noise pollution to environments is reduced effectively. The device is suitable for wide popularization in places with severe noise pollution.

The invention provides a spacecraft software structuring method based on IDEF modeling, Including: IDEF method is used to design modeling, modeling and layer by layer refinement are performed on decision-making, behaviors and activities of the spacecraft software system based on the functional decomposition, until to help software developers understand the software requirements and design an efficient and reliable architecture meeting the aerospace model software application requirements. The invention adopts the standard visual modeling method, which enables the project development, the testteam and the software stakeholders to more intuitively understand the system and the software requirements, and improves the software development efficiency. The top-down and layer-by-layer decomposition and refinement method is used to solve the problem of high coupling degree and poor traceability between functional and non-functional requirements in structural design. Clarify the dynamic and static relationship of each design element in software architecture design, improve the transparency of hardware components and software components, and make software component-level reuse have better operability.

The embodiment of the invention provides a big data visualization analysis method based on a knowledge graph, and the analysis method comprises the steps: obtaining the voice of a user, wherein the voice comprises the description of a data report demand; performing semantic understanding on the voice to generate a plurality of semantic keywords; selecting components in a plurality of knowledge maps according to the semantic keywords, wherein the components are used for constructing a report model, and the report model comprises report data, a data algorithm component and a visualization component; and through the visualization component, returning the report model after the report data is processed by the data algorithm component. Meanwhile, the invention further provides a big data visual analysis device based on the knowledge graph and a big data visual analysis method and device based on the knowledge graph. According to the embodiment of the invention, the problems of poor flexibility and complex development process caused by structural design in existing data report generation can be solved.

The invention relates to an automatic solar panel dust cleaning device which can be mounted on an outdoor unattended solar panel to realize automatic cleaning of dust accumulated on solar panel surfaces. The automatic solar panel dust cleaning device has a function of automatic cleaning at interval time, and a controller starts operation to complete once cleaning when set time is reached. By mounting of the cleaning device on a single solar panel, automatic cleaning of dust on the solar panel can be realized conveniently. The automatic cleaning device is simple in structural design, convenientto mount and low in power consumption, and long-term use of the automatic cleaning device is guaranteed; by adoption of a solar panel back-up power source for power supply, mains supply consumption is avoided; the automatic cleaning device is available for fixed-time automatic operation, and convenience in mounting and maintenance and reliability in operation are realized; as an auxiliary facility, the automatic solar panel dust cleaning device guarantees functionality of the solar panel, realizes fixed-time dust cleaning and is low in cost and suitable for large-scale application.

The invention relates to a component-based cable network process design system and method, and belongs to the technical field of digital manufacturing. Compared with an original electric fitting process compiling method mainly based on manual component recognition, the system and the method have the advantage that the efficiency of the electric fitting process is effectively improved by 30%. Alongwith the construction and application of a full three-dimensional digital development mode in the field of spacecraft development, the interface transmission standard of the design data is established between a design unit and a manufacturing enterprise, so that the reception, analysis, identification and utilization of the structured design data by the manufacturing enterprise become possible. In the process of cable network process design, the utilization of design data is maximized, and the process design efficiency of cable network products can be remarkably improved by means of a processtemplate knowledge pushing method.

A method for predicting wellbore temperature by region section based on cementing big data includes statistics of electric logging data of the block or adjacent blocks, structured design of data, establishment of cementing big data, data mining, and establishment of temperature prediction of each opening wellbore one by one by piecewise multiple regression geothermal gradient using progressive method. The invention can improve the accuracy of wellbore temperature prediction and avoid engineering and safety accidents caused by excessive wellbore temperature prediction error.

The invention discloses a water or aqueous solution based design method for a metamaterial frequency selective surface. The design method is characterized in that structural design is performed on a geometric profile of a water or aqueous solution by means of dielectric property of the water or aqueous solution, during fabrication, a low-dielectric constant dielectric material is fabricated to a die with a special shape by a 3D printing technology, a machining technology or other processing means, the water or aqueous solution is poured to the die to form a special shape, the water or aqueous solution and the die integratedly form metamaterial frequency selective surface having sub-wavelength structure characteristic, and the band-pass or band-stop frequency selective characteristic of an electromagnetic wave in a wide electromagnetic frequency band is achieved by setting parameters such as the geometric profile and the size of the water or aqueous solution. The design method has the advantages of simple fabrication process and low fabrication cost, local materials can be used during fabrication of a device, and a function that the metamaterial frequency selective surface can be restored is possessed.