CN110704213B - Virtual and real efficient real-time interaction method and system for digital twin data - Google Patents
Virtual and real efficient real-time interaction method and system for digital twin data Download PDFInfo
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Abstract
The invention discloses a method and a system for efficient real-time interaction of virtual and real data of digital twin data, which are suitable for Virtex-5 series FPGA chips of Xilinx company and comprise the following steps: designing a digital twin data virtual-real interaction coding and decoding module which completes conversion between heterogeneous protocols and coding and decoding of data frames to realize data interaction between a virtual model and a physical entity in a digital twin system based on a uniform frame format; designing a digital twin data virtual-real interaction scheduling module, firstly establishing two levels of caches to respectively finish the caching of a virtual model data frame and a physical entity data frame, secondly finishing the verification of the data frame, and finally finishing the scheduling transmission of the data frame based on a certain strategy, thereby realizing the high-efficiency real-time interaction of data between a virtual model and a physical entity in a digital twin system. The invention can solve the requirements of data interaction between the virtual model and the physical entity in the digital twin system on accuracy and real-time performance to a certain extent, and improves the efficiency of virtual-real interaction of the digital twin data.
Description
Technical Field
The invention belongs to the field of electronic engineering and computer science, and particularly relates to a method and a system for efficient real-time interaction of virtual and real digital twin data.
Background
The digital twin system is mainly represented by interaction between a virtual model and a physical entity, namely the interaction of virtual and real data, and not only can more vividly depict the running state of the manufacturing bottom layer equipment, but also can control and predict the running of the physical equipment through three-dimensional simulation analysis, so that the efficiency of the virtual and real data interaction in the digital twin system directly influences the activities. At present, various devices exist in a manufacturing bottom layer, massive heterogeneous data can be generated, and the interaction efficiency between a physical device and a virtual model becomes a research focus.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a method and a system for efficient real-time interaction of virtual and real data of digital twin data, and discloses the method and the system for efficient real-time interaction of the virtual and real data of the digital twin data, which are used for realizing uniform frame format transmission between a virtual model and a physical entity based on a designed data frame format while completing heterogeneous protocol conversion; in order to ensure real-time transmission of data frames which are sent to a physical entity by a virtual model and relate to control instructions and the like, two-level cache is designed and the virtual model is preferentially scheduled to the data frames of the physical entity, and meanwhile, the real-time response of each virtual model and the physical entity is ensured based on a designed byte polling scheduling method. The invention can solve the requirements of data interaction between the virtual model and the physical entity in the digital twin system on accuracy and real-time performance to a certain extent, and improves the efficiency of virtual-real interaction of the digital twin data.
The method and the system cover the design of a digital twin data virtual-real interaction coding and decoding module and the design of a digital twin data virtual-real interaction scheduling module, and can realize the high-efficiency real-time interaction of data between a virtual model and a physical entity in the digital twin system.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a virtual-real efficient real-time interaction method for digital twin data comprises the following steps:
designing a digital twin data virtual-real interaction coding and decoding module, wherein the module completes conversion between heterogeneous protocols and coding and decoding of data frames, and realizes data interaction between a virtual model and a physical entity in a digital twin system based on a uniform frame format, and the specific implementation is as follows:
① definition of data frame format includes frame head, source address, destination address, frame type, data area length, check code and frame tail, wherein the frame head and frame tail represent the start and end of data frame respectively, the source address and destination address represent the source and destination of data frame respectively, the frame type represents the direction of data frame, bit width is 1bit, when the data frame is sent from virtual model to physical entity, the frame type is binary '1', when the data frame is sent from physical entity to virtual model, the frame type is binary '0', the data area is used to load effective data to be transmitted, its length is filled in the length field of data area;
②, for the virtual model and physical entity of the heterogeneous protocol, completing protocol conversion according to the frame format defined in ①, where the protocol conversion is bidirectional, and can be converted from the protocol of the virtual model and physical entity itself to the frame format defined in ①, or from the frame format defined in ① to the protocol of the virtual model and physical entity itself, so as to facilitate data interaction between the virtual model and physical entity based on the unified frame format;
③ for either virtual model or physical entity, it is necessary to complete the coding of data frame before data transmission, i.e. fill each field of data frame;
designing a digital twin data virtual-real interaction scheduling module, wherein the module firstly establishes two levels of caches to respectively finish the caching of a virtual model data frame and a physical entity data frame, secondly finishes the verification of the data frame, and finally finishes the scheduling transmission of the data frame based on a certain strategy to realize the efficient real-time interaction of data between a virtual model and a physical entity in a digital twin system, and the specific implementation is as follows:
① checking each received data frame, namely judging whether the lowest byte added by the source address, the target address, the frame type, the data area and the length field of the data area is consistent with the check code field, if not, discarding the data frame;
②, establishing two levels of BRAM caches, namely, the first level cache is used for caching the data frame sent by the virtual entity by the virtual model, and the second level cache is used for caching the data frame sent by the physical entity by the virtual model;
③ when the first-level buffer is not empty, it schedules the data frame in the first-level buffer preferentially, in order to ensure the real-time response of each physical entity, the scheduling transmission of the data frame in the first-level buffer adopts the byte polling method, i.e. it transmits the 1 st byte in the 1 st data frame in the first-level buffer first, then transmits the 1 st byte in the 2 nd data frame in the first-level buffer, then transmits the 1 st byte in the 3 rd data frame in the first-level buffer, and so on, until the 1 st bytes of all data frames in the first-level buffer are transmitted completely, then transmits other bytes of all data frames in the first-level buffer according to the same strategy until the first-level buffer is empty;
④ when the first-level buffer is empty, the data frame in the second-level buffer is scheduled, in order to ensure the real-time response of each virtual model, the data frame in the second-level buffer adopts the byte polling scheduling method, i.e. the 1 st byte in the 1 st data frame in the second-level buffer is transmitted firstly, then the 1 st byte in the 2 nd data frame in the second-level buffer is transmitted, then the 1 st byte in the 3 rd data frame in the second-level buffer is transmitted, and so on, until the 1 st bytes of all data frames in the second-level buffer are transmitted completely, then other bytes of all data frames in the second-level buffer are transmitted according to the same strategy until the second-level buffer is empty.
The invention designs a virtual-real efficient real-time interaction method for digital twin data, and the method and the system are suitable for Virtex-5 series FPGA chips of Xilinx company.
The invention also provides a virtual-real efficient real-time interactive system of the digital twin data, which comprises computer equipment and a physical entity; the system also comprises a digital twin data virtual-real interaction coding and decoding module which completes the conversion between heterogeneous protocols and the coding and decoding of data frames to realize the data interaction between a virtual model and a physical entity in the digital twin system based on a uniform frame format; the virtual-real interaction scheduling module of the digital twin data firstly establishes two levels of cache to respectively complete the cache of a virtual model data frame and a physical entity data frame, secondly completes the verification of the data frame, and finally completes the scheduling transmission of the data frame based on a preset strategy to realize the high-efficiency real-time interaction of data between a virtual model and a physical entity in the digital twin system; a virtual model is arranged in the computer equipment; the method is characterized in that:
the virtual-real interaction coding and decoding module of the digital twin data completes the conversion between heterogeneous protocols and the coding and decoding of data frames, realizes the data interaction between a virtual model and a physical entity in the digital twin system based on a uniform frame format, and is specifically realized as follows:
① definition of data frame format includes frame head, source address, destination address, frame type, data area length, check code and frame tail, wherein the frame head and frame tail represent the start and end of data frame respectively, the source address and destination address represent the source and destination of data frame respectively, the frame type represents the direction of data frame, bit width is 1bit, when the data frame is sent from virtual model to physical entity, the frame type is binary '1', when the data frame is sent from physical entity to virtual model, the frame type is binary '0', the data area is used to load effective data to be transmitted, its length is filled in the length field of data area;
②, for the virtual model and physical entity of the heterogeneous protocol, the protocol conversion is completed according to the frame format defined in ①, the protocol conversion is bidirectional, and the protocol conversion can be converted from the virtual model and physical entity own protocol to the frame format defined in ①, and can also be converted from the frame format defined in ① to the virtual model and physical entity own protocol, so that the data interaction between the virtual model and the physical entity based on the unified frame format is facilitated;
③ for either virtual model or physical entity, it is necessary to complete the coding of data frame before data transmission, i.e. fill each field of data frame;
the digital twin data virtual-real interaction scheduling module firstly establishes two levels of caches to respectively complete the caching of a virtual model data frame and a physical entity data frame, secondly completes the verification of the data frame, and finally completes the scheduling transmission of the data frame based on a preset strategy to realize the efficient real-time interaction of data between a virtual model and a physical entity in a digital twin system, and the specific implementation is as follows:
① checking each received data frame, namely judging whether the lowest byte added by the source address, the target address, the frame type, the data area and the length field of the data area is consistent with the check code field, if not, discarding the data frame;
②, establishing two levels of BRAM caches, namely, the first level cache is used for caching the data frame sent by the virtual entity by the virtual model, and the second level cache is used for caching the data frame sent by the physical entity by the virtual model;
③ when the first-level buffer is not empty, it schedules the data frame in the first-level buffer preferentially, in order to ensure the real-time response of each physical entity, the scheduling transmission of the data frame in the first-level buffer adopts the byte polling method, i.e. it transmits the 1 st byte in the 1 st data frame in the first-level buffer first, then transmits the 1 st byte in the 2 nd data frame in the first-level buffer, then transmits the 1 st byte in the 3 rd data frame in the first-level buffer, and so on, until the 1 st bytes of all data frames in the first-level buffer are transmitted completely, then transmits other bytes of all data frames in the first-level buffer according to the same strategy until the first-level buffer is empty;
④ when the first-level buffer is empty, the data frame in the second-level buffer is scheduled, in order to ensure the real-time response of each virtual model, the data frame in the second-level buffer adopts the byte polling scheduling method, i.e. the 1 st byte in the 1 st data frame in the second-level buffer is transmitted firstly, then the 1 st byte in the 2 nd data frame in the second-level buffer is transmitted, then the 1 st byte in the 3 rd data frame in the second-level buffer is transmitted, and so on, until the 1 st bytes of all data frames in the second-level buffer are transmitted completely, then other bytes of all data frames in the second-level buffer are transmitted according to the same strategy until the second-level buffer is empty.
Compared with the prior art, the invention has the advantages that:
(1) the designed data frame format can realize the uniform frame format transmission between the virtual model and the physical entity, and the frame format can sufficiently depict the main elements of data interaction between the virtual model and the physical entity;
(2) the two-level cache and byte polling scheduling method based on design can ensure the real-time response of each virtual model and each physical entity on the premise of ensuring the timely transmission of key data frames.
Drawings
FIG. 1 is a block diagram of the system architecture of the present invention;
fig. 2 is a diagram illustrating a data frame format definition according to the present invention.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings.
The invention relates to a virtual-real efficient real-time interaction method and system for digital twin data, which are suitable for Virtex-5 series FPGA chips of Xilinx company. The digital twin system is mainly represented by interaction between a virtual model and a physical entity, namely the interaction of virtual and real data, and not only can more vividly depict the running state of the manufacturing bottom layer equipment, but also can control and predict the running of the physical equipment through three-dimensional simulation analysis, so that the efficiency of the virtual and real data interaction in the digital twin system directly influences the activities. At present, various devices exist in a manufacturing bottom layer, massive heterogeneous data can be generated, and the interaction efficiency between physical devices and virtual models becomes a research focus.
The structural block diagram of the invention is shown in fig. 1, and the specific implementation mode is as follows:
the system mainly comprises a digital twin data virtual-real interaction coding and decoding module which completes the conversion between heterogeneous protocols and the coding and decoding of data frames, and realizes the data interaction between a virtual model and a physical entity in the digital twin system based on a uniform frame format; the module firstly establishes two levels of cache to respectively finish the cache of a virtual model data frame and a physical entity data frame, secondly finishes the check of the data frame, and finally finishes the scheduling transmission of the data frame based on a certain strategy to realize the high-efficiency real-time interaction of data between a virtual model and a physical entity in a digital twin system.
(1) Fig. 1 shows a digital twin data virtual-real interactive encoding and decoding module, which is implemented as follows:
the data frame of the invention is a frame of data formed according to the defined data frame format after protocol conversion aiming at the virtual model and the physical entity of the heterogeneous protocol, and aims to realize the data interaction between the virtual model and the physical entity based on the uniform frame format.
① As shown in FIG. 2, the definition of the data frame format includes a frame header, a source address, a destination address, a frame type, a data area length, a check code and a frame tail, wherein the frame header and the frame tail respectively represent the start and the end of the data frame, the source address and the destination address respectively represent the source and the destination of the data frame, the frame type represents the direction of the data frame, the bit width is 1bit, when the data frame is sent from a virtual model to a physical entity, the frame type is binary '1', when the data frame is sent from the physical entity to the virtual model, the frame type is binary '0', the data area is used to load the effective data to be transmitted, the length of the effective data is filled in the data area length field, the source address, the destination address, the frame type, the data area and the data area length field are mathematically added, the lowest byte of the addition result is filled in the check code field;
②, for the virtual model and physical entity of the heterogeneous protocol, completing protocol conversion according to the frame format defined in ①, where the protocol conversion is bidirectional, and can be converted from the protocol of the virtual model and physical entity itself to the frame format defined in ①, or from the frame format defined in ① to the protocol of the virtual model and physical entity itself, so as to facilitate data interaction between the virtual model and physical entity based on the unified frame format;
③ for either virtual model or physical entity, it is necessary to complete the coding of data frame before data transmission, i.e. fill each field of data frame;
(2) fig. 1, 2, shows a digital twin data virtual-real interaction scheduling module, which is implemented as follows:
① checking each received data frame, namely judging whether the lowest byte added by the source address, the target address, the frame type, the data area and the length field of the data area is consistent with the check code field, if not, discarding the data frame;
②, establishing two levels of BRAM caches, namely, the first level cache is used for caching the data frame sent by the virtual entity by the virtual model, and the second level cache is used for caching the data frame sent by the physical entity by the virtual model;
③ when the first-level buffer is not empty, it schedules the data frame in the first-level buffer preferentially, in order to ensure the real-time response of each physical entity, the scheduling transmission of the data frame in the first-level buffer adopts the byte polling method, i.e. it transmits the 1 st byte in the 1 st data frame in the first-level buffer first, then transmits the 1 st byte in the 2 nd data frame in the first-level buffer, then transmits the 1 st byte in the 3 rd data frame in the first-level buffer, and so on, until the 1 st bytes of all data frames in the first-level buffer are transmitted completely, then transmits other bytes of all data frames in the first-level buffer according to the same strategy until the first-level buffer is empty;
④ when the first-level buffer is empty, the data frame in the second-level buffer is scheduled, in order to ensure the real-time response of each virtual model, the data frame in the second-level buffer adopts the byte polling scheduling method, i.e. the 1 st byte in the 1 st data frame in the second-level buffer is transmitted firstly, then the 1 st byte in the 2 nd data frame in the second-level buffer is transmitted, then the 1 st byte in the 3 rd data frame in the second-level buffer is transmitted, and so on, until the 1 st bytes of all data frames in the second-level buffer are transmitted completely, then other bytes of all data frames in the second-level buffer are transmitted according to the same strategy until the second-level buffer is empty.
In summary, the invention discloses a method and a system for efficient real-time interaction of digital twin data virtual and real, which comprises a design of a digital twin data virtual and real interaction coding and decoding module and a design of a digital twin data virtual and real interaction scheduling module, and can realize efficient real-time interaction of data between a virtual model and a physical entity in a digital twin system.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A virtual-real efficient real-time interaction method for digital twin data is characterized by comprising the following steps:
designing a digital twin data virtual-real interaction coding and decoding module, wherein the module completes conversion between heterogeneous protocols and coding and decoding of data frames, and realizes data interaction between a virtual model and a physical entity in a digital twin system based on a uniform frame format, and the specific implementation is as follows:
① definition of data frame format includes frame head, source address, destination address, frame type, data area length, check code and frame tail, wherein the frame head and frame tail represent the start and end of data frame respectively, the source address and destination address represent the source and destination of data frame respectively, the frame type represents the direction of data frame, bit width is 1bit, when the data frame is sent from virtual model to physical entity, the frame type is binary '1', when the data frame is sent from physical entity to virtual model, the frame type is binary '0', the data area is used to load effective data to be transmitted, its length is filled in the length field of data area;
②, for the virtual model and physical entity of the heterogeneous protocol, the protocol conversion is completed according to the frame format defined in ①, the protocol conversion is bidirectional, and the protocol conversion can be converted from the virtual model and physical entity own protocol to the frame format defined in ①, and can also be converted from the frame format defined in ① to the virtual model and physical entity own protocol, so that the data interaction between the virtual model and the physical entity based on the unified frame format is facilitated;
③ for either virtual model or physical entity, it is necessary to complete the coding of data frame before data transmission, i.e. fill each field of data frame;
designing a digital twin data virtual-real interaction scheduling module, wherein the module firstly establishes two levels of caches to respectively finish the caching of a virtual model data frame and a physical entity data frame, secondly finishes the verification of the data frame, and finally finishes the scheduling transmission of the data frame based on a preset strategy to realize the efficient real-time interaction of data between a virtual model and a physical entity in a digital twin system, and the specific implementation is as follows:
① checking each received data frame, namely judging whether the lowest byte added by the source address, the target address, the frame type, the data area and the length field of the data area is consistent with the check code field, if not, discarding the data frame;
②, establishing two levels of BRAM caches, namely, the first level cache is used for caching the data frame sent by the virtual entity by the virtual model, and the second level cache is used for caching the data frame sent by the physical entity by the virtual model;
③ when the first-level buffer is not empty, it schedules the data frame in the first-level buffer preferentially, in order to ensure the real-time response of each physical entity, the scheduling transmission of the data frame in the first-level buffer adopts the byte polling method, i.e. it transmits the 1 st byte in the 1 st data frame in the first-level buffer first, then transmits the 1 st byte in the 2 nd data frame in the first-level buffer, then transmits the 1 st byte in the 3 rd data frame in the first-level buffer, and so on, until the 1 st bytes of all data frames in the first-level buffer are transmitted completely, then transmits other bytes of all data frames in the first-level buffer according to the same strategy until the first-level buffer is empty;
④ when the first-level buffer is empty, the data frame in the second-level buffer is scheduled, in order to ensure the real-time response of each virtual model, the data frame in the second-level buffer adopts the byte polling scheduling method, i.e. the 1 st byte in the 1 st data frame in the second-level buffer is transmitted firstly, then the 1 st byte in the 2 nd data frame in the second-level buffer is transmitted, then the 1 st byte in the 3 rd data frame in the second-level buffer is transmitted, and so on, until the 1 st bytes of all data frames in the second-level buffer are transmitted completely, then other bytes of all data frames in the second-level buffer are transmitted according to the same strategy until the second-level buffer is empty.
2. The method for efficient virtual-real time interaction of digital twin data as claimed in claim 1, wherein the method is applied to Xilinx Virtex-5 series FPGA chips.
3. A virtual-real efficient real-time interactive system of digital twin data comprises computer equipment and a physical entity; the system also comprises a digital twin data virtual-real interaction coding and decoding module which completes the conversion between heterogeneous protocols and the coding and decoding of data frames to realize the data interaction between a virtual model and a physical entity in the digital twin system based on a uniform frame format; the virtual-real interaction scheduling module of the digital twin data firstly establishes two levels of cache to respectively complete the cache of a virtual model data frame and a physical entity data frame, secondly completes the verification of the data frame, and finally completes the scheduling transmission of the data frame based on a preset strategy to realize the high-efficiency real-time interaction of data between a virtual model and a physical entity in the digital twin system; a virtual model is arranged in the computer equipment; the method is characterized in that:
the virtual-real interaction coding and decoding module of the digital twin data completes the conversion between heterogeneous protocols and the coding and decoding of data frames, realizes the data interaction between a virtual model and a physical entity in the digital twin system based on a uniform frame format, and is specifically realized as follows:
① definition of data frame format includes frame head, source address, destination address, frame type, data area length, check code and frame tail, wherein the frame head and frame tail represent the start and end of data frame respectively, the source address and destination address represent the source and destination of data frame respectively, the frame type represents the direction of data frame, bit width is 1bit, when the data frame is sent from virtual model to physical entity, the frame type is binary '1', when the data frame is sent from physical entity to virtual model, the frame type is binary '0', the data area is used to load effective data to be transmitted, its length is filled in the length field of data area;
②, for the virtual model and physical entity of the heterogeneous protocol, the protocol conversion is completed according to the frame format defined in ①, the protocol conversion is bidirectional, and the protocol conversion can be converted from the virtual model and physical entity own protocol to the frame format defined in ①, and can also be converted from the frame format defined in ① to the virtual model and physical entity own protocol, so that the data interaction between the virtual model and the physical entity based on the unified frame format is facilitated;
③ for either virtual model or physical entity, it is necessary to complete the coding of data frame before data transmission, i.e. fill each field of data frame;
the digital twin data virtual-real interaction scheduling module firstly establishes two levels of caches to respectively complete the caching of a virtual model data frame and a physical entity data frame, secondly completes the verification of the data frame, and finally completes the scheduling transmission of the data frame based on a preset strategy to realize the efficient real-time interaction of data between a virtual model and a physical entity in a digital twin system, and the specific implementation is as follows:
① checking each received data frame, namely judging whether the lowest byte added by the source address, the target address, the frame type, the data area and the length field of the data area is consistent with the check code field, if not, discarding the data frame;
②, establishing two levels of BRAM caches, namely, the first level cache is used for caching the data frame sent by the virtual entity by the virtual model, and the second level cache is used for caching the data frame sent by the physical entity by the virtual model;
③ when the first-level buffer is not empty, it schedules the data frame in the first-level buffer preferentially, in order to ensure the real-time response of each physical entity, the scheduling transmission of the data frame in the first-level buffer adopts the byte polling method, i.e. it transmits the 1 st byte in the 1 st data frame in the first-level buffer first, then transmits the 1 st byte in the 2 nd data frame in the first-level buffer, then transmits the 1 st byte in the 3 rd data frame in the first-level buffer, and so on, until the 1 st bytes of all data frames in the first-level buffer are transmitted completely, then transmits other bytes of all data frames in the first-level buffer according to the same strategy until the first-level buffer is empty;
④ when the first-level buffer is empty, the data frame in the second-level buffer is scheduled, in order to ensure the real-time response of each virtual model, the data frame in the second-level buffer adopts the byte polling scheduling method, i.e. the 1 st byte in the 1 st data frame in the second-level buffer is transmitted firstly, then the 1 st byte in the 2 nd data frame in the second-level buffer is transmitted, then the 1 st byte in the 3 rd data frame in the second-level buffer is transmitted, and so on, until the 1 st bytes of all data frames in the second-level buffer are transmitted completely, then other bytes of all data frames in the second-level buffer are transmitted according to the same strategy until the second-level buffer is empty.
4. A digital twin data Virtex efficient real-time interactive system as claimed in claim 3, wherein the system is adapted for Xilinx Virtex-5 series FPGA chips.
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