Resrarch On System High Level Modeling And Model Integration Technology For Flight Control System Digital Design

“Flight Control System(FCS) Digital Design” is the key point of “Aircraft Digital Design & Manufacture Engineering(ADDME)”, the purpose of which is proposing a digital design in FCS, and improving the design efficiency, quality, besides decreasing the cost. This paper focuses on the following three key technologies including the construction of the digital design environment, the method of system high-level modeling, and the method of multi-domain model integration in FCS digital design.The concept and connotation of FCS digital design is firstly illustrated, then a digital design method of FCS is presented, which includes system high-level modeling, multi-domain modeling, model encapsulation, multi-domain model integration, and cross-level model scheduling. According to the method of FCS digital design, we establish the streamline digital design procedure including requirements analysis, system high-level modeling, domain model design, domain model encapsulation, multi-domain model integration, virtual prototype integrated, and virtual prototype delivery.The method of system high-level modeling in FCS digital design is deeply studied. First, in order to modeling and simulate FCS during program demonstration, we present a system high-level modeling method on the basis of Sys ML profile under the frame of modular-function-behavior-structure. Secondly, the atomic model and compound model construction method of enlargement mechanism based on Sys ML “light-weight” are given based on the abstract of common character of various domain model, atomic model and compound model are formally defined. Thirdly, according to the established atomic model and compound model, the methods of static structure modeling and dynamic behavior modeling of system high-level modeling are studied. In the end, the hierarchical scheduling method of atomic model and compound model of system high-level modeling is studed based on events flow and data flow. Logic error can be eliminated in the initial period of system design by the method of system high-level modeling, thus avoid unnecessary circular design produced by logic error found in the later stage.The method of multi-domain model integration of FCS is deeply studied. First of all in terms of the feature of various domain heterogeneous model in digital design of FCS, the method of multi-domain model integration on the base of meta object facility and adapter is proposed. Secondly, the integration methods of the CATIA model of the mechanical structure and ADAMS model of dynamics is studied, ADAMS model of dynamics and SIMULINK model of the control system, SIMULINK model of the control system and RHAPSODY model of the control logic are studied. Then, co-simulation of virtual prototype of FCS which includes system high-level model, the mechanical structure model, dynamic system model, the control system model and the the control logic model is studied.Digital design environment for FCS(FCS-DDE) is researched. In terms of the characteristics of FCS and the concept, connotation and objectivity of FCS digital design, the indispensable features of FCS-DDE are researched. Then, a four-layer FCS-DDE, which includes model design layer, virtual component design layer, virtual prototype integration layer and scheduling management layer, is constructed based on commercial-off-the-shelf. This design lays the foundation for designing virtual prototype of flight control system rapidly.Finally, FCS of micro aircraft vehicle is designed, verifying the feasibility of the method in this paper. Firstly, the requirement analysis of FCS is performed, and system high-level modeling is done according to the requirement model. Then, domain modeling and multi-domain model are integrated based on the corresponding subsystem of FCS in every atomic model, verifying multi-domain model by the co-simulation. At last, the virtual prototype of FCS is obtained by integrating system high-level model and multi-domain model, the design efficiency of the virtual prototype is verified in terms of system behavior, function, and performance, thus further confirming the feasibility of FCS digital design.