CN111507020A - Graphical display method for distributed simulation results of electromechanical systems of multi-electric aircraft - Google Patents
Graphical display method for distributed simulation results of electromechanical systems of multi-electric aircraft Download PDFInfo
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Abstract
The invention relates to a graphical display method for distributed simulation results of a multi-electric-aircraft electromechanical system, which comprises three parts, namely a DDS (direct digital synthesis) soft bus, a communication interface and a configuration display platform, wherein the method takes a data distribution service, namely the DDS soft bus, as a basic data communication mode, communication interface software is compiled by using C + + language, data interaction between the configuration graphical display platform and the DDS soft bus is realized, and the simulation results of the configuration graphical display platform and the DDS soft bus can be automatically obtained by the communication interface software compiled by the C + + language; and designing a standard graphic display mode and a data display format on a configuration display platform to realize integrated graphic display of the simulation result of the multi-electric aircraft electromechanical system. The invention uses a virtual instrument and process visualization mode to replace data display and representation methods of different simulation software environments, and integrates, visualizes and standardizes abstract data information.
Description
Technical Field
The invention relates to a method for graphically displaying simulation results in a distributed simulation process of a multi-electric aircraft, in particular to a graphical display method for distributed simulation results of an electromechanical system of the multi-electric aircraft, which is used for graphically displaying simulation verification results in a design stage of the multi-electric aircraft.
Background
The electromechanical system is an important component in a multi-electric airplane and is an airborne system which needs to be intensively researched in the airplane design stage, and the simulation method is an important design verification means and plays an important guiding role in design evaluation and verification of the airplane system. Because the multi-electric aircraft electromechanical system has the characteristics of complex cross-linking relation, frequent energy conversion and the like, a distributed simulation platform is generally utilized to perform distributed simulation on multi-field complex models in the multi-electric aircraft electromechanical system during simulation, and DDS (direct digital synthesis) soft buses are utilized to connect simulation models in different simulation environments, so that real-time and efficient data interaction among simulation nodes is realized.
In the whole distributed simulation process, different simulation environments and models in different fields are used, and the simulation results have different display methods and representation specifications, so that the obtained simulation results are difficult to be uniformly displayed and directly analyzed.
The configuration technology is a man-machine interface development technology widely used in the field of current industrial control, interface primitives are added and configured in a graphical visualization mode to complete the construction of a man-machine interface, and the configuration technology is applied in the fields of industrial control and aerospace.
Disclosure of Invention
In view of the situation and existing correction of the prior art, the invention provides a graphical display method for distributed simulation results of a multi-electric aircraft electromechanical system, and aims to obtain a graphical representation method capable of achieving unified standard and integrated display of the simulation results of the distributed simulation platform of the aircraft electromechanical system based on data distribution Service (data distribution Service), so that the working efficiency of the simulation platform can be improved in the stages of simulation result analysis and experimental scheme verification.
The invention is realized by the following technical scheme: a graphical display method for distributed simulation results of electromechanical systems of multi-electric aircraft is characterized by comprising the following steps: the method comprises three parts, namely a DDS soft bus, a communication interface and a configuration display platform, wherein the method takes a data distribution service, namely the DDS soft bus, as a basic data communication mode, communication interface software is compiled by using C + + language, so that data interaction between the configuration graphic display platform and the DDS soft bus is realized, and the simulation result of the configuration graphic display platform and the DDS soft bus can be automatically obtained by the communication interface software compiled by the C + + language; designing a standard graphic display mode and a data display format on a configuration display platform to realize integrated graphic display of simulation results of the electromechanical system of the multi-electric aircraft;
the method comprises the steps of realizing data transmission of a simulation result of the multi-electric aircraft electromechanical system based on distributed simulation through a DDS soft bus, wherein the DDS soft bus is a data-centered publish/subscribe communication mode defined by an OMG (open multimedia gateway), and the DDS specification uses UM L language to describe services and provides a data model irrelevant to a platform;
the interface part mainly utilizes C + + language to compile interface software, encapsulates API interface functions on the DDS, defines a universal data format, designs an interface between the configuration display platform and a DDS bus, and enables the configuration display platform to perform related operations of publishing and subscribing by means of a DDS distributed architecture through the interface so as to perform real-time data interaction;
the interface design structure comprises a part for creating a client, setting QoS (quality of service), inquiring matched publishers/subscribers, sending data, processing received data and releasing resources; after the design of a simulation system is finished, the simulation platform establishes all simulation port variable description files of the electromechanical system, the files contain all model port information on the platform, including model port names, port data types and initial value information, a configuration sub-engine obtains the description files from a data interface by calling an API function, then a variable manager generates a variable list required by a simulation environment, wherein input parameters in the list correspond to input and parameter variables of the model, output signals correspond to output and signal variables of the model, and global variables are intermediate operation process variables; the main engine interacts with the model sub-engine through control flow and instruction flow to complete resolving and state switching operation of the simulation model by receiving instruction information sent by the simulation operation management module and the model, after the model executes resolving once, the model sub-engine writes simulation data on a DDS bus through a model interface, then under the control of the simulation operation management module, the configuration sub-engine reads data of a corresponding model port in the DDS and transmits the data to a variable list, and finally the data are processed through a formula and a script to promote dynamic refreshing display of equipment variables in a system schematic diagram;
the method comprises the steps of respectively realizing a process by utilizing a special API function of C + + language, obtaining and accessing a DDS soft bus by a sub-engine ① through loading a dynamically generated dynamic library, searching a model description file which comprises model creation information, configuration information and port information, L obtaining the model creation information and the configuration information and recording the model creation information and the configuration information into a sub-engine memory, L obtaining model port information and storing the model port information into the sub-engine memory, finally informing a configurable display platform of the obtained model port information by the sub-engine, automatically generating a corresponding variable list which comprises a variable name, a variable type and initial value information by the configurable display platform and preparing for writing simulation data, embedding the simulation sub-engine into a data interface by receiving/sending data in the bus and performing an instruction interaction function with a main engine, so that the configurable environment receives operation control of a simulation operation management module and reads the simulation data in a DDS in real time, wherein the simulation sub-engine is a key for interface design, the main API function and function applied in the interface design stage are BOOSePTDATA () initializing the configuration management module and obtaining a simulation state of a GemDataType, obtaining a simulation environment (GemDataType) and obtaining a simulation state of a GemDataType, obtaining a simulation model when a simulation state reaches a simulation state of a virtual pointer, (the DDS, obtaining a virtual pointer, (the virtual pointer) pointer, (the virtual pointer) pointer, (the virtual pointer) obtains the virtual pointer, (the virtual pointer) pointer, (the virtual pointer) the virtual pointer, (the virtual pointer) pointer, (the virtual pointer) the virtual pointer, (the virtual pointer) the virtual pointer, (the virtual pointer) the;
the configuration display platform is mainly used for displaying simulation data, combining simulation system graphs and displaying simulation system animations; the display of the simulation data refers to receiving data of simulation models running in different simulation software in the distributed simulation system through interface software, and dynamically displaying the simulation data result in a display platform; simulation results of simulation software with different configurations can be obtained visually and rapidly by defining simulation data on a display platform; the combination of the graphics means that a plurality of primitives can be combined together to be used as one primitive, and on the basis, the function of a graphic library can be realized, namely the combined primitives are stored to be used as a graphic library for designers to use; in a vector graphics system, one picture is mostly composed of a plurality of primitives, or one picture is composed of a plurality of layers, and each layer contains a plurality of primitives; therefore, the combined primitive is firstly a primitive in design and is composed of a plurality of primitives; the animation effect of the system is mainly realized by the dynamic change of the position, the size and the color; the dynamic change is to realize dynamic effect mainly according to conditions set by a user, and the conditions are generally related to system variables, including a calculation formula consisting of the system variables or a script containing the system variables.
The invention has the beneficial effects that: the invention uses a virtual instrument and process visualization mode to replace data display and representation methods of different simulation software environments, and integrates, visualizes and standardizes abstract data information.
The method uses a DDS soft bus as a communication basic protocol, takes charge of simulation operation management by using control flow and clock flow, takes charge of data interaction by using the data flow, coordinates different data formats and different simulation clocks in AMEsim, Matlab/simulink and FlightSIM simulation software, establishes a graphical display method for simulation results of various simulation software, solves the integrated, visualized and normalized display functions of different software simulation results in a multi-electric aircraft distributed simulation system, and provides powerful technical guarantee for the subsequent integral analysis of simulation data.
By the method, nearly thousands of simulation results of a flight control system model, a fuel system model, an engine system model, an aircraft landing gear system model, a power system model, an environment control system model and other system models on the distributed simulation platform can be integrated and graphically displayed, and the method has important practical significance for realizing direct analysis and simulation verification of the distributed simulation results of the electromechanical system of the multi-electric aircraft.
Drawings
FIG. 1 is a diagram of a DDS-based distributed simulation platform structure according to the present invention;
FIG. 2 is a schematic diagram of a network structure of the middleware of the present invention;
FIG. 3 is a schematic diagram of the interface software workflow of the present invention;
FIG. 4 is a schematic diagram of a configurable display platform according to the present invention;
FIG. 5 is a diagram illustrating data association according to the present invention.
Detailed Description
The graphical display method for distributed simulation results of the electromechanical system of the multi-electric aircraft provided by the invention is described in detail below with reference to the accompanying drawings and the specific implementation.
As shown in fig. 1, an existing distributed simulation platform architecture employs a simulation soft bus as a basic communication protocol of different simulation environments. The simulation soft bus adopts the international data communication standard DDS as a data communication middleware, the middleware is a type of software between an application system and system software, and the simulation soft bus uses basic services (functions) provided by the system software to link each part of the application system or different applications on a network, so that the aims of resource sharing and function sharing can be achieved. Currently, middleware generally accepts the definition given by IDC: middleware is a separate system software or service by which distributed application software shares resources between different technologies, resides on the operating system of the client server, manages computing resources and network communications. As shown in fig. 2, the middleware has the following operation mechanism: the application program on the client needs to obtain certain data or services from a certain place in the network, the data or services may be in a server running in different operating systems and specific query language databases, the client/server application program only needs to access a middleware system when being responsible for searching data, the middleware finishes the task of finding data sources or services from the network, further transmitting client requests and recombining reply information, and finally returning results to the client application program. Therefore, the DDS-based distributed simulation platform is connected with Matlab/Simulink, AMESim and other professional simulation software, can perform collaborative simulation on the multi-electric aircraft, can be used as a basic communication protocol for distributed simulation of the electromechanical system of the multi-electric aircraft, and provides a basic data interaction environment for a graphical display method.
And the interface part realizes the interaction of the bottom layer data of the configuration display platform and the DDS soft bus by designing interface software. The interface software is compiled by using C + + language, the configuration display can drive the real-time dynamic display of the display part by acquiring simulation data transmitted in a DDS (direct digital synthesizer) soft bus through the interface software, meanwhile, the control on the simulation model can be realized by operating the configuration display platform, the configuration platform is integrated in the DDS-based distributed simulation platform, and the integrated display function of the operation result of the heterogeneous electromechanical system simulation model in the distributed simulation platform is realized. By encapsulating API interface functions on the DDS and defining a universal data format, an interface between the configuration platform and the DDS bus is designed, and the configuration monitoring platform can perform related operations of publishing and subscribing by means of a DDS distributed architecture through the interface, so that real-time data interaction is performed. When the method is specifically realized, a C + + language model Cosimports API module can be utilized, so that a user can develop interface software of a complex distributed system in a visual studio environment. The CoSimPorts API can incorporate a model developed by C + + codes into an integrated verification environment to perform work such as engineering management, design, operation management, data monitoring and the like. In the collaborative simulation process, the interface software interacts the simulation data with the model data distributed on the DDS soft bus by calling the API function of the C + + language interface module. The configuration display platform obtains simulation model data in the DDS bus through the data interface and drives the dynamic display of a system schematic diagram and the configuration platform to adjust parameters, and the simulation model can make corresponding response. The working process schematic diagram of the interface software is shown in fig. 3, the interface software initializes a sub-engine, judges whether simulation is ready by judging an input port list, loads a model description file when the simulation is ready, reads required port data on a configuration display platform according to a display schematic diagram after the loading is successful, requests different simulation model sub-threads from a DDS soft bus to obtain simulation data in the running process, and sends the simulation data to the configuration display platform for dynamic centralized display of the configuration display platform.
The main working principle of the configuration display platform is shown in fig. 4, and the simulation result is displayed through the included system configuration editing environment, equipment configuration model editing environment, system configuration running environment, variable management environment and script editing environment. The combination of graphics means that a plurality of primitives can be combined together to be used as one primitive. On the basis, functions such as a graphic library can be realized, namely, the combined graphic elements are stored to be used as a graphic library for designers to use. In a vector graphics system, a picture is mostly composed of multiple primitives, or a picture is composed of multiple layers, and each layer contains multiple primitives. The combined primitive is designed to be a primitive first and to be composed of a plurality of primitives. The animation effect of the system is mainly realized by the dynamic change of position, size, color and the like. The dynamic change is to realize dynamic effect mainly according to conditions set by a user, and the conditions are generally related to system variables, including a calculation formula consisting of the system variables or a script containing the system variables. The driving data comes from the simulation soft bus, for a simulation project, the data is packaged in the simulation soft bus, DDS data service is adopted, control flow and clock flow are responsible for simulation operation management, and data flow is responsible for data interaction. And acquiring data from the data stream by the simulation environment, and driving and displaying. The simulation node is connected with the soft bus in a hanging mode to realize the functions of simulation data transmission, simulation clock event transmission and simulation management (simulation scheduling command transmission). Because the models constructed in each simulation environment are different and the model interfaces are different, the data transmitted in the simulation soft bus are also different. And the emulation soft bus usually needs to build a global data structure to realize the collaborative emulation data interaction. Due to the wide variety of data transmitted in the soft bus, the system is required to dynamically establish a global data structure, and to realize hooking with the soft bus through a group of API functions so as to access the corresponding data structure and realize simulation control.
The method for associating the variable with the internal variable of the soft bus is shown in fig. 5.
The configuration display platform mainly realizes the functions of the configuration display platform through a configuration editing environment, an equipment configuration model editing environment, a system configuration running environment, a variable management environment and a script editing environment, and the specific requirements are as follows:
(1) configuration editing environment: through the assembly of the equipment function model, the rapid principle graphic environment of the electromechanical system is established graphically, a plurality of display pages can be generated, functional principle diagrams of a hydraulic system, a fuel system, an environment control system, a landing gear system, an electrical system and the like are displayed simultaneously, and the data or animation display of the equipment model can be associated with external variables.
(2) Equipment configuration model editing environment: the module is used for establishing a functional model library of an electromechanical system of the airplane in a graphical mode, such as a hydraulic system, a fuel system, an environmental control system, an undercarriage system, an electrical system and the like, and a graphical display module is formed. Control parameters can be set, and dynamic display (such as animation, data, curves and the like) of the module can be driven through variables. The user can develop the model in the model library for the second time.
(3) The system configuration operation environment: can control simulation operation, data display and the like. The simulation bus data can be acquired through the bus driving module and the system principle graphic picture can be driven to display at regular time. The dynamic behavior of the device can be controlled by the script.
(4) Variable management environment: the simulation soft bus data description file can be loaded, and external variables required by the prototype system can be automatically generated.
(5) Script editing environment: the VBScript script can be edited, the behaviors of all the components can be flexibly responded through the script, and the system does not need to be recompiled.
According to the above description, the technical scheme of the invention can be reproduced by combining with the professional knowledge in the technical field.
Claims (1)
1. A graphical display method for distributed simulation results of electromechanical systems of multi-electric aircraft is characterized by comprising the following steps: the method comprises three parts, namely a DDS soft bus, a communication interface and a configuration display platform, wherein the method takes a data distribution service, namely the DDS soft bus, as a basic data communication mode, communication interface software is compiled by using C + + language, so that data interaction between the configuration graphic display platform and the DDS soft bus is realized, and the simulation result of the configuration graphic display platform and the DDS soft bus can be automatically obtained by the communication interface software compiled by the C + + language; designing a standard graphic display mode and a data display format on a configuration display platform to realize integrated graphic display of simulation results of the electromechanical system of the multi-electric aircraft;
the method comprises the steps of realizing data transmission of a simulation result of the multi-electric aircraft electromechanical system based on distributed simulation through a DDS soft bus, wherein the DDS soft bus is a data-centered publish/subscribe communication mode defined by an OMG (open multimedia gateway), and the DDS specification uses UM L language to describe services and provides a data model irrelevant to a platform;
the interface part mainly utilizes C + + language to compile interface software, encapsulates API interface functions on the DDS, defines a universal data format, designs an interface between the configuration display platform and a DDS bus, and enables the configuration display platform to perform related operations of publishing and subscribing by means of a DDS distributed architecture through the interface so as to perform real-time data interaction;
the interface design structure comprises a part for creating a client, setting QoS (quality of service), inquiring matched publishers/subscribers, sending data, processing received data and releasing resources; after the design of a simulation system is finished, the simulation platform establishes all simulation port variable description files of the electromechanical system, the files contain all model port information on the platform, including model port names, port data types and initial value information, a configuration sub-engine obtains the description files from a data interface by calling an API function, then a variable manager generates a variable list required by a simulation environment, wherein input parameters in the list correspond to input and parameter variables of the model, output signals correspond to output and signal variables of the model, and global variables are intermediate operation process variables; the main engine interacts with the model sub-engine through control flow and instruction flow to complete resolving and state switching operation of the simulation model by receiving instruction information sent by the simulation operation management module and the model, after the model executes resolving once, the model sub-engine writes simulation data on a DDS bus through a model interface, then under the control of the simulation operation management module, the configuration sub-engine reads data of a corresponding model port in the DDS and transmits the data to a variable list, and finally the data are processed through a formula and a script to promote dynamic refreshing display of equipment variables in a system schematic diagram;
the method comprises the steps of respectively realizing a process by utilizing a special API function of C + + language, obtaining and accessing a DDS soft bus by a sub-engine ① through loading a dynamically generated dynamic library, searching a model description file which comprises model creation information, configuration information and port information, L obtaining the model creation information and the configuration information and recording the model creation information and the configuration information into a sub-engine memory, L obtaining model port information and storing the model port information into the sub-engine memory, finally informing a configurable display platform of the obtained model port information by the sub-engine, automatically generating a corresponding variable list which comprises a variable name, a variable type and initial value information by the configurable display platform and preparing for writing simulation data, embedding the simulation sub-engine into a data interface by receiving/sending data in the bus and performing an instruction interaction function with a main engine, so that the configurable environment receives operation control of a simulation operation management module and reads the simulation data in a DDS in real time, wherein the simulation sub-engine is a key for interface design, the main API function and function applied in the interface design stage are BOOSePTDATA () initializing the configuration management module and obtaining a simulation state of a GemDataType, obtaining a simulation environment (GemDataType) and obtaining a simulation state of a GemDataType, obtaining a simulation model when a simulation state reaches a simulation state of a virtual pointer, (the DDS, obtaining a virtual pointer, (the virtual pointer) pointer, (the virtual pointer) pointer, (the virtual pointer) obtains the virtual pointer, (the virtual pointer) pointer, (the virtual pointer) the virtual pointer, (the virtual pointer) pointer, (the virtual pointer) the virtual pointer, (the virtual pointer) the virtual pointer, (the virtual pointer) the;
the configuration display platform is mainly used for displaying simulation data, combining simulation system graphs and displaying simulation system animations; the display of the simulation data refers to receiving data of simulation models running in different simulation software in the distributed simulation system through interface software, and dynamically displaying the simulation data result in a display platform; simulation results of simulation software with different configurations can be obtained visually and rapidly by defining simulation data on a display platform; the combination of the graphics means that a plurality of primitives can be combined together to be used as one primitive, and on the basis, the function of a graphic library can be realized, namely the combined primitives are stored to be used as a graphic library for designers to use; in a vector graphics system, one picture is mostly composed of a plurality of primitives, or one picture is composed of a plurality of layers, and each layer contains a plurality of primitives; therefore, the combined primitive is firstly a primitive in design and is composed of a plurality of primitives; the animation effect of the system is mainly realized by the dynamic change of the position, the size and the color; the dynamic change is to realize dynamic effect mainly according to conditions set by a user, and the conditions are generally related to system variables, including a calculation formula consisting of the system variables or a script containing the system variables.
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| CN113221318A (en) * | 2021-03-30 | 2021-08-06 | 北京计算机技术及应用研究所 | DDS-based system-level simulation test environment construction method |
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| CN113255116A (en) * | 2021-05-11 | 2021-08-13 | 四川知周科技有限责任公司 | Splitting parallel simulation method for modeling of aircraft electromechanical system |
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