CN115712957A - Method, equipment and storage medium for constructing simulation model of aircraft landing gear retraction system - Google Patents
Method, equipment and storage medium for constructing simulation model of aircraft landing gear retraction system Download PDFInfo
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Abstract
The invention discloses a method, equipment and a storage medium for constructing a simulation model of an aircraft landing gear retraction system, wherein the method comprises the steps of decomposing the landing gear retraction system to obtain a framework of the landing gear retraction system; building a simulation model library of the retraction control subsystem, and building a retraction control subsystem model by using functional modules in the simulation model library of the retraction control subsystem; building a retraction hydraulic subsystem simulation model library, and building a retraction hydraulic subsystem model by using a component model in the retraction hydraulic subsystem simulation model library; building a receiving and releasing mechanical subsystem simulation model base, and building a receiving and releasing mechanical subsystem model by using a Modelica dynamic simulation model of components in the receiving and releasing mechanical subsystem simulation model base; a simulation model of the frame lifting and releasing system is constructed by a releasing and releasing control subsystem model, a releasing and releasing hydraulic subsystem model and a releasing and releasing mechanical subsystem model. The invention can improve the research and development efficiency of the undercarriage retraction system and reduce the research and development cost.
Description
Technical Field
The invention belongs to the technical field of engineering system modeling simulation, and particularly relates to a Modelica-based method, a Modelica-based device and a Modelica-based storage medium for constructing a simulation model of an undercarriage retraction system.
Background
In order to reduce aerodynamic drag in flight and counteract the adverse effects of increased aircraft mass, modern aircraft landing gear is usually retractable, and the landing gear retraction system becomes an important part of the aircraft, and the performance of the system directly affects the safety and maneuverability of the aircraft. Therefore, the verification of the functional performance of the retraction and release of the landing gear of the airplane is one of the important links of the airplane design.
The aircraft landing gear retraction system is a complex system which relates to multiple major and multiple disciplines of mechanical, electrical, hydraulic and control, the cross-linking relation is complex, the design and production period of the aircraft landing gear retraction system is long, the investment is large, if the early verification is insufficient, various fault problems are often caused after the delivery, and the cost and the progress are greatly influenced. And the test verification based on a physical prototype in the earlier stage has high cost and long period, and is difficult to meet the requirements of modern aircraft landing gear retraction and extension in the aspects of production design and structure optimization. Therefore, by means of a virtual prototype technology, a simulation model of the undercarriage retraction system is built, data support is provided for the design optimization of the retraction of the undercarriage, and the method has important significance for improving the design research and development efficiency of projects and the safety and reliability of the system.
The Modelica language is an object-oriented, equation-based and non-causal multi-field unified modeling language, and has natural advantages in the aspect of construction of large-scale complex heterogeneous models which relate to multi-disciplines and multi-professional coupling of mechanics, electronics, control, hydraulics, pneumatics, heat and the like. Meanwhile, the Modelica language has good openness, can integrate various heterogeneous models, can establish models of different subjects and different specialties in a unified platform, integrates simulation models, and develops system-level integrated simulation.
Disclosure of Invention
The invention aims to provide a method, equipment and a storage medium for constructing a simulation model of an aircraft landing gear retraction system, so as to solve the problems that the traditional development and test based on a physical prototype has long production and development period, difficult performance test and high experimental cost, and is difficult to meet the requirements of the aircraft landing gear retraction system on product upgrade, technical innovation and the like.
The invention solves the technical problems through the following technical scheme: a method for constructing a simulation model of an aircraft landing gear retraction system comprises the following steps:
decomposing the undercarriage retraction system to obtain a framework of the undercarriage retraction system;
building a retraction control subsystem simulation model base based on the architecture of the aircraft landing gear retraction system, and building a retraction control subsystem model by using functional modules in the retraction control subsystem simulation model base;
building a retraction hydraulic subsystem simulation model base based on the architecture of the aircraft landing gear retraction system, and building a retraction hydraulic subsystem model by using component models in the retraction hydraulic subsystem simulation model base;
building a retraction mechanical subsystem simulation model base based on the architecture of the aircraft landing gear retraction system, and building a retraction mechanical subsystem model by using a Modelica dynamic simulation model of components in the retraction mechanical subsystem simulation model base;
based on the physical topological structure of the undercarriage retraction system, an undercarriage retraction system simulation model is constructed by the retraction control subsystem model, the retraction hydraulic subsystem model and the retraction mechanical subsystem model.
Furthermore, the aircraft landing gear retraction system is divided into a retraction control subsystem, a retraction hydraulic subsystem and a retraction mechanical subsystem;
the retraction control subsystem is divided into a retraction logic module, a release logic module and an emergency release logic module;
the retraction hydraulic subsystem is decomposed into a power source, a hydraulic valve and an actuating mechanism; the power source is decomposed into a pressure source, a flow source and a pump source, the hydraulic valve is decomposed into a reversing valve, a flow valve and a pressure valve, and the actuating mechanism is decomposed into a front undercarriage unlocking actuating cylinder, a main undercarriage unlocking actuating cylinder and a retraction actuating cylinder;
the retraction mechanical subsystem is divided into a left main undercarriage, a right main undercarriage, a main lift cabin door, a nose undercarriage and a front lift cabin door.
Further, the specific construction process of the collection and control subsystem simulation model library is as follows:
and calling each function module of the receiving and releasing control subsystem in the Modelica3.2.3 standard library, and forming a receiving and releasing control subsystem simulation model library by each function module.
Further, the specific construction process of the retraction control subsystem model comprises the following steps:
and constructing the folding and unfolding control subsystem model by functional modules in the folding and unfolding control subsystem simulation model library based on Modelica language specifications and folding and unfolding control logics.
Further, the specific construction process of the collecting and releasing hydraulic subsystem simulation model library is as follows:
building each component model of the retractable hydraulic subsystem, and forming a retractable hydraulic subsystem simulation model library by each component model; the specific construction process of each component model comprises the following steps:
defining a working medium, a constraint equation and an abstract interface of a component through a text layer and a graphic layer based on Modelica language specification;
designing icons, parameter panels and component model description documents of components in a graphic layer;
and testing and optimizing the component model to complete the construction of the component model.
Further, the specific construction process of the retractable hydraulic subsystem model comprises the following steps:
defining interfaces of each component model in the hydraulic subsystem simulation model library, determining physical flows and signal flows of each component model interface, and connecting the interfaces of each component model according to the physical flows and the signal flows of the component model interfaces to form each component model;
and defining the interfaces of each component model, defining the physical flow and the signal flow of each component model interface, and connecting the interfaces of each component model according to the physical flow and the signal flow of the component model interface to form the receiving and releasing hydraulic subsystem model.
Further, the specific construction process of the collecting and releasing mechanical subsystem simulation model library is as follows:
building a three-dimensional model of each component of the collecting and releasing mechanical subsystem by using three-dimensional software;
exporting three-dimensional models of the components by using a three-dimensional conversion plug-in to form Modelica dynamic simulation models of the corresponding components;
and opening the Modelica dynamic simulation model of each part, and forming a collection and release mechanical subsystem simulation model library by the Modelica dynamic simulation models of each part.
Further, the specific construction process of the collecting and releasing mechanical subsystem model comprises the following steps:
converting a kinematic pair between the part Modelica dynamic simulation model and the part Modelica dynamic simulation model into a Modelica language kinematic pair model;
opening the Modelica dynamic simulation model of each part, establishing a connection relation with the world module, and packaging and combining the Modelica dynamic simulation models of all the parts to obtain a dynamic simulation model of the subsystem of the folding and unfolding machine;
associating each Modelica dynamic simulation model in the collecting and releasing mechanical subsystem dynamic simulation model with a three-dimensional standard geometric file, and setting the path and the position of the three-dimensional standard geometric file to realize the visualization of the collecting and releasing mechanical subsystem dynamic simulation model;
and setting parameters of the collecting and releasing mechanical subsystem dynamic simulation model to complete the construction of the collecting and releasing mechanical subsystem model.
Based on the same invention concept, the invention also provides a simulation model construction device of the undercarriage retraction system, which comprises the following steps:
a memory for storing a computer program;
and the processor is used for realizing the steps of the simulation model construction method of the aircraft landing gear retraction system when the computer program is executed.
Based on the same inventive concept, the invention further provides a computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method for constructing the simulation model of the aircraft landing gear retraction system are realized.
Advantageous effects
Compared with the prior art, the invention has the advantages that:
the invention provides a method, equipment and a storage medium for constructing a simulation model of an undercarriage retraction system, wherein the method analyzes basic components of subsystems forming the undercarriage retraction system to obtain structural characteristics and working characteristics of the basic components, develops a mathematical model of each basic component by adopting a Modelica language specification based on a mechanism modeling method, combines each basic component model according to a schematic diagram or control logic to obtain a corresponding subsystem model, and injects system parameters according to actual working conditions; and finally, combining the subsystems to form a complete aircraft landing gear retraction system.
The invention adopts Modelica language development, so that the developed model library is clear in hierarchy, and the model can be reused and expanded, thereby greatly improving the modeling efficiency and being capable of rapidly and effectively carrying out modeling and simulation verification aiming at different signal requirements; the invention integrates hydraulic, mechanical and control subsystems, realizes multi-field unified modeling in the same software, and has higher simulation solving precision and efficiency compared with multi-field software combined simulation modeling.
When the model is constructed, the method of mechanism modeling is adopted, compared with other methods, the method has higher simulation precision of the model, is closer to the working state of an actual system, can obviously improve the research and development efficiency of the undercarriage retraction system, reduces the research and development cost, and has important significance on the maintenance iteration of the undercarriage retraction system.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only one embodiment of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow chart of a method for constructing a simulation model of an aircraft landing gear retraction system according to an embodiment of the invention;
FIG. 2 is an architectural diagram of an aircraft landing gear retraction system in an embodiment of the present invention;
FIG. 3 is a diagram of a model of a retraction control subsystem in an embodiment of the present invention;
FIG. 4 is a schematic diagram of a component model building for deploying and retracting a hydraulic subsystem in an embodiment of the invention;
FIG. 5 is a schematic diagram of an architecture of a simulation model library of an aircraft landing gear retraction system according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a simulation model of an aircraft landing gear retraction system in an embodiment of the invention.
The method comprises the following steps of 1-deploying and retracting control subsystem model, 2-deploying and retracting hydraulic subsystem model, 3-Modelica dynamic simulation model of a nose landing gear, 4-Modelica dynamic simulation model of a front lifting door, 5-Modelica dynamic simulation model of a left main landing gear, 6-Modelica dynamic simulation model of a main lifting door and 7-Modelica dynamic simulation model of a right main landing gear.
Detailed Description
The technical solutions in the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical means of the present application will be described in detail with specific examples. These several specific embodiments may be combined with each other below, and details of the same or similar concepts or processes may not be repeated in some embodiments.
As shown in fig. 1, a method for building a simulation model of an aircraft landing gear retraction system according to an embodiment of the present invention includes the following steps:
the method comprises the following steps: disassembly of aircraft landing gear retraction system
The aircraft landing gear retraction system is divided into a retraction control subsystem, a retraction hydraulic subsystem and a retraction mechanical subsystem. The collecting and releasing control subsystem is mainly used for collecting sensor feedback signals, outputting corresponding instruction signals to the collecting and releasing hydraulic subsystem, and mainly decomposing the signals into a collecting logic module, a releasing logic module and an emergency releasing logic module according to functions. The main function of the retraction hydraulic subsystem is to receive an instruction signal transmitted by the retraction control subsystem, drive and control the hydraulic valve to work, enable the hydraulic actuating mechanism to work according to the instruction and transmit the output physical signal (force and displacement) to the retraction mechanical subsystem; decomposing according to a hydraulic schematic diagram of an undercarriage retraction system, wherein a retraction hydraulic subsystem is decomposed into a power source, a hydraulic valve and an actuating mechanism; the power source is decomposed into a pressure source, a flow source and a pump source, the hydraulic valve is decomposed into a reversing valve, a flow valve and a pressure valve, and the actuating mechanism is decomposed into a front undercarriage unlocking actuating cylinder, a main undercarriage unlocking actuating cylinder and a retraction actuating cylinder. The mechanical retraction subsystem is mainly used for simulating the kinematics and dynamics of the mechanical structure of the aircraft landing gear when the mechanical structure moves, and transmitting a physical signal output by the hydraulic retraction subsystem to a kinematic pair of the mechanical retraction subsystem, so that the mechanical structure performs retraction movement according to an instruction, the whole retraction process can be displayed through animation, and the mechanical retraction subsystem is decomposed into a left main landing gear, a right main landing gear, a main starting cabin door, a front landing gear and a front starting cabin door; the architecture of the resulting aircraft landing gear retraction system is shown in figure 2.
Step two: and constructing a retraction control subsystem simulation model base based on the architecture of the aircraft landing gear retraction system, and constructing a retraction control subsystem model by using the functional modules in the retraction control subsystem simulation model base.
As shown in fig. 2, the retraction control subsystem includes a receive logic module, a drop logic module, and an emergency drop logic module, and these functional modules can be directly called from the modelica3.2.3 standard library, so the retraction control subsystem simulation model library is composed of a receive logic module, a drop logic module, and an emergency drop logic module, which are called from the modelica3.2.3 standard library.
Based on a simulation model library of a retraction control subsystem, a retraction control subsystem model is constructed by using multi-field unified modeling and simulation analysis software MWorks.Sysplorer, based on a StateGraph (state machine) library and a retraction control logic in a Modelica3.2.3 standard library, a retraction logic module, a drop logic module, an emergency drop logic module and the like, as shown in FIG. 3.
The retraction control logic is as follows: and activating a judgment condition according to a signal fed back by the retraction mechanical subsystem, realizing the transition of the working state, converting the instruction in each state, sending an instruction signal to the retraction hydraulic subsystem, and driving the retraction mechanical subsystem to work, wherein the logic control state machine model mainly comprises an undercarriage retraction-up state, an undercarriage extension state and an emergency extension state.
For functional modules which are not available in a StateGraph (state machine) library in the modelica3.2.3 standard library, the functional modules can define a working medium, a constraint equation and an abstract interface of the functional module through a text layer and a graphic layer according to the basic principle of the functional module, design icons, parameter panels and model description documents of the functional module on the graphic layer, test and optimize the functional module, and finally complete the development of the functional module, as shown in fig. 4.
Step three: and constructing a retraction hydraulic subsystem simulation model base based on the architecture of the aircraft landing gear retraction system, and constructing a retraction hydraulic subsystem model by using component models in the retraction hydraulic subsystem simulation model base.
Building models of all parts of the retractable hydraulic subsystem, and forming a retractable hydraulic subsystem simulation model library by the models of all parts. As shown in fig. 2, the retraction hydraulic subsystem comprises a power source, a hydraulic valve and an actuating mechanism; the power source comprises a pressure source, a flow source and a pump source, the hydraulic valve comprises a reversing valve, a flow valve and a pressure valve, and the executing mechanism comprises a front undercarriage unlocking actuating cylinder, a main undercarriage unlocking actuating cylinder and a retraction actuating cylinder. By utilizing multi-field unified modeling and simulation analysis software MWorks.Sysplorer, on the basis of Modelica3.2.3 language specifications, combining actual physical parameters and characteristics of the basic components, and respectively constructing mathematical models of the basic components by adopting a mechanism modeling mode, as shown in figure 4, the constructed component models can accurately reflect the working characteristics of the basic components, and can realize performance simulation under different oil liquids and different temperatures and reflect the fluid states and characteristics of the basic components in combination with an oil liquid medium model.
Taking a retraction reversing valve as an example, as shown in fig. 4, the specific construction process of each component model is as follows:
according to the basic principle of the retractable reversing valve, based on Modelica language specifications, a text layer and a graphic layer of multi-field unified modeling and simulation analysis software MWorks.Sysplorer are utilized to define a working medium, a constraint equation and an abstract interface of the retractable reversing valve; designing icons, parameter panels and model description documents of the retractable reversing valves on a graphic layer; and testing and optimizing the retractable reversing valve to complete the construction of the retractable reversing valve.
Based on a receiving and releasing hydraulic subsystem simulation model library, the specific construction process of the receiving and releasing hydraulic subsystem model is as follows:
step 3.1: defining interfaces of each component model in the receiving and releasing hydraulic subsystem simulation model library, determining physical flows and signal flows of each component model interface, and connecting the interfaces of each component model according to the physical flows and the signal flows of the component model interfaces to form each component model;
step 3.2: and defining the interfaces of each component model, defining the physical flow and the signal flow of each component model interface, and connecting the interfaces of each component model according to the physical flow and the signal flow of the component model interface to form the receiving and releasing hydraulic subsystem model.
According to the invention, the actual physical parameters and characteristics of the components are combined, the mathematical model is established based on a mechanism modeling method, the established component model can accurately reflect the working characteristics of the component model, and the digital support is provided for the design optimization of the hydraulic system for retracting and releasing the landing gear by combining the developed oil medium and reflecting the fluid characteristics of oil in each component.
Step four: building a retraction mechanical subsystem simulation model base based on the architecture of the aircraft landing gear retraction system, and building a retraction mechanical subsystem model by using a Modelica dynamic simulation model of components in the retraction mechanical subsystem simulation model base;
as shown in fig. 2, the retraction mechanical subsystem mainly includes a left main landing gear, a right main landing gear, a main lift gate, a nose landing gear, and a nose lift gate. Building a three-dimensional model of each component of the retractable mechanical subsystem in CATIA three-dimensional software; exporting the three-dimensional models of the parts by using a KineTrans plug-in to form a Modelica dynamic simulation model of the corresponding part, and converting a kinematic pair between the Modelica dynamic simulation model of the part and the Modelica dynamic simulation model of the part into a Modelica language kinematic pair model; a Modelica dynamic simulation model of each part is opened in multi-field unified modeling and simulation analysis software MWorks.
The method utilizes a KineTrans plug-in (conversion tool) to convert the related main data information of the three-dimensional model into a structure information model based on Modelica language specification, encapsulates the structure information model into a Modelica dynamic simulation model, creates a physical signal (force and displacement) transmission interface of the Modelica dynamic simulation model, realizes the construction of mechanical multi-body models of the landing gear and the cabin door of the airplane, and can carry out animation demonstration on the retraction process of the landing gear system in real time during simulation.
Based on the collection and release mechanical subsystem simulation model library, the specific construction process of the collection and release mechanical subsystem model is as follows:
step 4.1: opening a Modelica dynamic simulation model of each part in multi-field unified modeling and simulation analysis software MWorks.Sysplorer, calling a world module in a Modelica3.2.3 standard library, connecting the world module and the Modelica dynamic simulation model corresponding to each part through a posture conversion module, and packaging and combining the Modelica dynamic simulation models of all the parts to obtain the dynamic simulation model of the subsystem of the folding and unfolding machine.
The attitude conversion module is used for constraining the coordinate system offset relationship between the world module and the Modelica dynamic simulation models corresponding to the parts, and adjusting the positions of the Modelica dynamic simulation models corresponding to the parts in the world module.
Step 4.2: associating each Modelica dynamic simulation model in the collecting and releasing mechanical subsystem dynamic simulation model with a three-dimensional standard geometric file (.stl), and setting the path and the position of the three-dimensional standard geometric file to realize the visualization of the collecting and releasing mechanical subsystem dynamic simulation model; through visual analysis, the three-dimensional animation and the curve are combined to carry out motion analysis, so that the debugging efficiency and the modeling accuracy of the model can be improved.
Step 4.3: and setting parameters of the collecting and releasing mechanical subsystem dynamic simulation model to complete the construction of the collecting and releasing mechanical subsystem model.
After the collection and release mechanical subsystem dynamic simulation model is built, parameters of Modelica dynamic simulation models of all components of the subsystem dynamic simulation model are required to be set. In the embodiment, a model is opened by using multi-field unified modeling and simulation analysis software mworks.
The parameters of the dynamic simulation model of the retractable mechanical subsystem comprise parameters of Modelica dynamic simulation models of all parts, parameters of a Modelica language kinematic pair model, parameters of an attitude conversion module and parameters of a world module.
The Modelica dynamic simulation models (namely rigid body models) of all parts are main part models for constructing the retractable mechanical subsystem, when all part models in the retractable mechanical subsystem three-dimensional models are converted into the Modelica dynamic simulation models, all independent part models are regarded as a rigid body model, main data of all part three-dimensional models are added to the corresponding rigid body models, and each rigid body model can be associated with a three-dimensional geometric file. During simulation, parameters in the rigid body model are set according to actual quality parameters of all parts of the designed radio and player mechanical subsystem, wherein the specific parameters comprise part quality, mass center quality, rotational inertia and initialization parameters. The initialization parameters refer to values of the initial moment of model calculation, and mainly include names of the three-dimensional components, shapes of the three-dimensional components, colors and materials of the three-dimensional components, initial positions and postures of the three-dimensional components, lengths, widths and heights of the three-dimensional components, and other additional information of the three-dimensional components.
According to the motion relation of each part of the folding and unfolding mechanical subsystem in a three-dimensional space, a motion pair (such as a sliding pair, a revolute pair, a universal joint, a spherical hinge and the like) is arranged between Modelica dynamic simulation models of each part of the folding and unfolding mechanical subsystem, and meanwhile, the motion direction and the initial motion information of the motion pair are also arranged, wherein the initial motion information comprises an initial position, a speed and the like. For the kinematic pair needing to be added with the drive, an additional interface is needed to be arranged, and an external mechanical interface is generated for transmitting force and displacement information.
The parameters of the attitude conversion module comprise relative positions and attitudes, and the relative position and attitude relationship between adjacent components of the retraction mechanical subsystem is mainly determined. The parameters of the world module comprise the gravity acceleration and the acting direction thereof, and mainly determine the gravity field parameters of the current simulation environment.
Fig. 5 shows a system simulation model library constituted by the respective subsystem simulation model libraries.
Step five: based on the physical topological structure of the undercarriage retraction system, an undercarriage retraction system simulation model is constructed by the retraction control subsystem model, the retraction hydraulic subsystem model and the retraction mechanical subsystem model.
As shown in fig. 1, a model-driven bottom-up integration process is based on a model, a model of a component, an assembly and a subsystem of the undercarriage retraction system is respectively constructed based on a Modelica language, and a simulation model of the undercarriage retraction system is established by adopting a drag-type modeling according to a physical topological structure of the undercarriage retraction system.
The different models or subsystems in the simulation model library are connected through connectors, the connectors contain flow variables and potential variables and are achieved based on the generalized kirchhoff law, namely the sum of the flow variables is zero and the potential variables are equal. As shown in fig. 6, based on the built retraction control subsystem model, retraction hydraulic subsystem model and retraction mechanical subsystem model, the retraction system principle of the aircraft landing gear is combined, and a multi-field uniform modeling and simulation analysis software mworks.
The retraction control subsystem collects feedback signals of the retraction mechanical subsystem, activates corresponding working states through judgment, outputs instruction signals to the retraction hydraulic subsystem, the retraction hydraulic subsystem receives corresponding instruction signals, controls the reversing valve to reverse, drives the undercarriage/cabin door to unlock, and the retraction actuator cylinder to start working, mechanical interfaces of the retraction actuator cylinder and the unlocking actuator cylinder are connected with the retraction mechanical subsystem, physical signals generated by movement of the actuator cylinder are transmitted to a kinematic pair in the retraction mechanical subsystem, and movement of the undercarriage and the cabin door mechanical multi-body model is achieved. The built simulation model of the undercarriage retraction system can be used for developing a virtual simulation test of the undercarriage retraction system by injecting system simulation parameters, predicting the dynamic behavior of the undercarriage retraction system, and analyzing the model building accuracy and the undercarriage retraction system function and performance more comprehensively and clearly.
The invention constructs the simulation model of the undercarriage retraction system based on the component model and the subsystem model in the model library, analyzes the performance of the undercarriage retraction system, can also establish a fault mechanism, simulates an emergency mechanism when the undercarriage retraction system fails, and has reference significance for modeling simulation of other electromechanical and hydraulic systems of the airplane.
The invention is based on the thought of system engineering Modeling (MBSE), and completes the development of a system simulation model according to top-down system decomposition and bottom-up engineering modeling. The Modelica language is an object-oriented, equation-based and non-causal multi-field unified modeling language, and has natural advantages for constructing a large-scale complex heterogeneous model which relates to multidisciplinary and multi-professional coupling of mechanics, electronics, control, hydraulics, pneumatics, heat and the like.
Compared with other methods, the mechanism modeling method adopted by the invention has higher model simulation precision, is closer to the actual system working state, can obviously improve the research and development efficiency of the undercarriage retraction system, reduces the research and development cost, and has important significance on maintenance iteration of the undercarriage retraction system.
The simulation model of the undercarriage retraction system can also integrate and utilize atmospheric environment and dry/wet runway to simulate different ground environments, and whether the working performance of the undercarriage retraction system simulation model meets the design requirements under the limit condition or not can be judged.
The above disclosure is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or modifications within the technical scope of the present disclosure may be easily conceived by those skilled in the art and shall be covered by the scope of the present invention.
Claims (10)
1. A method for constructing a simulation model of an aircraft landing gear retraction system is characterized by comprising the following steps:
decomposing the undercarriage retraction system to obtain a framework of the undercarriage retraction system;
building a retraction control subsystem simulation model base based on the architecture of the aircraft landing gear retraction system, and building a retraction control subsystem model by using functional modules in the retraction control subsystem simulation model base;
building a retraction hydraulic subsystem simulation model base based on the architecture of the aircraft landing gear retraction system, and building a retraction hydraulic subsystem model by using component models in the retraction hydraulic subsystem simulation model base;
building a receiving and releasing mechanical subsystem simulation model base based on the architecture of the aircraft landing gear receiving and releasing system, and building a receiving and releasing mechanical subsystem model by using a Modelica dynamic simulation model of components in the receiving and releasing mechanical subsystem simulation model base;
based on the physical topological structure of the undercarriage retraction system, an undercarriage retraction system simulation model is constructed by the retraction control subsystem model, the retraction hydraulic subsystem model and the retraction mechanical subsystem model.
2. The method for constructing the simulation model of the undercarriage retraction system according to claim 1, wherein the undercarriage retraction system is decomposed into a retraction control subsystem, a retraction hydraulic subsystem and a retraction mechanical subsystem;
the retraction control subsystem is divided into a retraction logic module, a release logic module and an emergency release logic module;
the retraction hydraulic subsystem is decomposed into a power source, a hydraulic valve and an actuating mechanism; the power source is decomposed into a pressure source, a flow source and a pump source, the hydraulic valve is decomposed into a reversing valve, a flow valve and a pressure valve, and the actuating mechanism is decomposed into a front undercarriage unlocking actuating cylinder, a main undercarriage unlocking actuating cylinder and a retraction actuating cylinder;
the retraction mechanical subsystem is divided into a left main undercarriage, a right main undercarriage, a main lift cabin door, a nose undercarriage and a front lift cabin door.
3. The method for building the simulation model of the aircraft landing gear retraction system according to claim 1, wherein the specific building process of the retraction control subsystem simulation model library is as follows:
and calling each function module of the receiving and releasing control subsystem in the Modelica3.2.3 standard library, and forming a receiving and releasing control subsystem simulation model library by each function module.
4. The method for constructing the simulation model of the aircraft landing gear retraction system according to any one of claims 1 to 3, wherein the specific construction process of the retraction control subsystem model is as follows:
and constructing the retraction control subsystem model by the functional modules in the retraction control subsystem simulation model library based on Modelica language specifications and retraction control logic.
5. The method for building the simulation model of the aircraft landing gear retraction system according to claim 1, wherein the specific building process of the retraction hydraulic subsystem simulation model library is as follows:
building each component model of the retractable hydraulic subsystem, and forming a retractable hydraulic subsystem simulation model library by each component model; the specific construction process of each component model comprises the following steps:
defining a working medium, a constraint equation and an abstract interface of a component through a text layer and a graphic layer based on Modelica language specification;
designing icons, parameter panels and component model description documents of components in a graphic layer;
and testing and optimizing the component model to complete the construction of the component model.
6. The method for building the simulation model of the aircraft landing gear retraction system according to claim 1 or 5, wherein the specific building process of the retraction hydraulic subsystem model is as follows:
defining interfaces of each component model in the receiving and releasing hydraulic subsystem simulation model library, determining physical flows and signal flows of each component model interface, and connecting the interfaces of each component model according to the physical flows and the signal flows of the component model interfaces to form each component model;
and defining the interfaces of the component models, determining the physical flow and the signal flow of the interfaces of the component models, and connecting the interfaces of the component models according to the physical flow and the signal flow of the interfaces of the component models to form the receiving and releasing hydraulic subsystem model.
7. The method for building the simulation model of the aircraft landing gear retraction system according to claim 1, wherein the specific building process of the retraction mechanical subsystem simulation model library is as follows:
building a three-dimensional model of each component of the collecting and releasing mechanical subsystem by using three-dimensional software;
exporting three-dimensional models of the components by using a three-dimensional conversion plug-in to form Modelica dynamic simulation models of the corresponding components;
and opening the Modelica dynamic simulation model of each part, and forming a collection and release mechanical subsystem simulation model library by the Modelica dynamic simulation models of each part.
8. The method for constructing the simulation model of the aircraft landing gear retraction system according to claim 1 or 7, wherein the specific construction process of the retraction mechanical subsystem model is as follows:
converting a kinematic pair between the part Modelica dynamic simulation model and the part Modelica dynamic simulation model into a Modelica language kinematic pair model;
opening the Modelica dynamic simulation model of each part, establishing a connection relation with the world module, and packaging and combining the Modelica dynamic simulation models of all the parts to obtain a dynamic simulation model of the subsystem of the folding and unfolding machine;
associating each Modelica dynamic simulation model in the collecting and releasing mechanical subsystem dynamic simulation model with a three-dimensional standard geometric file, and setting the path and the position of the three-dimensional standard geometric file to realize the visualization of the collecting and releasing mechanical subsystem dynamic simulation model;
and setting parameters of the collecting and releasing mechanical subsystem dynamic simulation model to complete the construction of the collecting and releasing mechanical subsystem model.
9. An aircraft landing gear retraction system simulation model construction device, the device comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method of constructing a simulation model for an aircraft landing gear retraction system according to any one of claims 1 to 8 when the computer program is executed.
10. A computer-readable storage medium, characterized in that: the computer readable storage medium has a computer program stored thereon, which when executed by a processor, implements the steps of the method for constructing a simulation model of an aircraft landing gear retraction system according to any one of claims 1 to 8.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116257942A (en) * | 2023-05-16 | 2023-06-13 | 东方空间技术(山东)有限公司 | Rocket simulation model determining method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116257942A (en) * | 2023-05-16 | 2023-06-13 | 东方空间技术(山东)有限公司 | Rocket simulation model determining method and device |
| CN116257942B (en) * | 2023-05-16 | 2023-08-15 | 东方空间技术(山东)有限公司 | Rocket simulation model determining method and device |
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