CN112464403A - Knowledge base-based parametric design method for test run rack of aircraft engine - Google Patents
Knowledge base-based parametric design method for test run rack of aircraft engine Download PDFInfo
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Abstract
The invention provides a knowledge base-based parametric design method for an aircraft engine test run rack, which comprises the following steps: s1: establishing a parameterized design knowledge base; s2: establishing a template by using a parameterized design knowledge base; establishing connection between three-dimensional modeling software and the parameterized design knowledge base through a three-dimensional modeling interface module, calling design knowledge in the parameterized design knowledge base, and automatically generating three-dimensional template models of all parts of a product in the three-dimensional modeling software and storing the three-dimensional template models in the template base; s3: inputting design information according to design requirements, and generating a product configuration file through a design scheme decision module; calling a corresponding template from the template library through a template selection calling module according to the product configuration file; s4: modifying the main parameters in the template model by using a parametric deformation design module, and automatically changing the auxiliary parameters; and automatically updating the three-dimensional template model in three-dimensional modeling software and generating a two-dimensional engineering drawing to complete the parametric design of the product.
Description
Technical Field
The invention relates to the technical field of test run stands of aero-engines, in particular to a knowledge base-based parametric design method for the test run stands of the aero-engines.
Background
The aviation gas turbine engine is the development center of the aviation industry technology, and the research and development process of the aviation gas turbine engine is supported by the experiment about the design of the overall structure and performance, the research and the debugging of the components and the like. Because different engines may have differences in mounting structures, a high-altitude simulation test bed for mounting and fixing the engines and providing test functions and interfaces in a test run test needs to be specially designed.
A parametric design system for a trial run rack is established in documents of 'parametric design research of an aero-engine high-altitude simulation trial run rack, gas turbine test and research, p 53-57 in 03 of 2018', and the modular, semi-automatic and full three-dimensional rapid design of the trial run rack is realized. However, due to the particularity of the test stand of the aircraft engine, information such as the layout structure and the design rules of the test stand may change, and the parameterized design method can only realize parameterized design under a single rule and cannot meet the requirement of updating design knowledge. Therefore, the invention provides a knowledge base-based parametric design method for an aircraft engine test run rack.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a knowledge base-based parametric design method for an aircraft engine test run rack. Size constraints, assembly constraints and the like in the design process of the test run stand of the aircraft engine are stored as a parameterized design knowledge base. And establishing a template model by utilizing related knowledge in a knowledge base, determining a design scheme, and modifying the main parameter change model on the template model to realize parametric design.
In order to achieve the above purpose, the present invention provides the following technical solutions.
A knowledge base-based parametric design method for an aircraft engine test run rack comprises the following steps:
s1: establishing a parameterized design knowledge base;
s2: establishing a template by using a parameterized design knowledge base; establishing connection between three-dimensional modeling software and the parameterized design knowledge base through a three-dimensional modeling interface module, calling design knowledge in the parameterized design knowledge base, and automatically generating three-dimensional template models of all parts of a product in the three-dimensional modeling software and storing the three-dimensional template models in the template base;
s3: inputting design information according to design requirements, and generating a product configuration file through a design scheme decision module; calling a corresponding template from the template library through a template selection calling module according to the product configuration file, and determining the template required by design;
s4: modifying the main parameters in the template model by using a parametric deformation design module, wherein the auxiliary parameters automatically change due to the constraint relation between the auxiliary parameters and the main parameters; and automatically updating the three-dimensional template model in three-dimensional modeling software and generating a two-dimensional engineering drawing to complete the parametric design of the product.
Preferably, the S1 includes the steps of:
s1.1: collecting product configuration information, size constraint information and assembly constraint information required in the parametric design process;
s1.2: the method comprises the following steps of carrying out module division on an aeroengine test bed, wherein the module division comprises four parts, namely a flow tube, a main fulcrum, an auxiliary fulcrum and an exhaust diffuser;
s1.3: the collected knowledge is classified and sorted by the design knowledge management module according to the divided modules, main parameters and auxiliary parameters in the design process are determined and stored in the parameterized design knowledge base.
Preferably, in S1, the method further includes: and establishing a design knowledge maintenance module, wherein the design knowledge maintenance module is used for calling and modifying knowledge in the parameterized design knowledge base and storing the knowledge in the parameterized design knowledge base into the parameterized design knowledge base after updating.
Preferably, the design requirements include: engine length, engine inlet section diameter and engine exhaust nozzle diameter; the main parameters include: the diameters and total lengths of the flow tube and the exhaust diffuser, and the sizes and row-to-row positions of the main fulcrum and the auxiliary fulcrum.
Preferably, the design scheme decision module generates a decision algorithm by using existing knowledge in a parameterized design knowledge base, and when a user inputs design information of the length of the engine, the diameter of an inlet section of the engine and the diameter of a nozzle of the tail of the engine according to actual requirements, the decision algorithm comprehensively considers the length and installation position limits of the test bed, selects a proper layout structure of the test bed, and generates a configuration file of the test bed of the aero-engine after the design scheme is determined.
Preferably, the template selection calling module selects and calls a template model required by design from a template library according to a configuration file of the test stand of the aircraft engine so as to carry out parametric design.
Preferably, the parameterized design module is used for carrying out parameterized design on the product parts on the selected three-dimensional template model according to the main parameters; and (4) changing the model by modifying the main parameters, and outputting the updated three-dimensional model and the two-dimensional engineering drawing.
The invention has the beneficial effects that:
the invention provides a knowledge base-based parametric design method for an aircraft engine test bed;
(1) aiming at special products such as an aircraft engine test-run rack, a knowledge-based design scheme decision-making module is added before parametric design. Even if the structural layout of the test run rack and other information are changed, the parametric design of the product can still be realized.
(2) The design experience of designers is collated and embodied as a parameterized design knowledge base, and the parameterized design knowledge base is called in the process of establishing a template and making a design scheme decision, so that the parameterized design process based on knowledge is realized.
(3) A design knowledge maintenance module is added. Due to the particularity of products such as an aircraft engine test bed, information such as design rules and the like may change, and therefore updating of parametric design knowledge is required. The maintenance of the parameterized design knowledge is realized through calling and modifying.
The invention is further described with reference to the following figures and examples.
Drawings
Fig. 1 is a system structure diagram of a knowledge-base-based aircraft engine test-run bench parameterization design method according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
A knowledge base-based aircraft engine test-run rack parameterization design method is shown in a specific system block diagram in figure 1 and comprises the following steps:
s1: collecting various kinds of knowledge required in the parameterization process of the trial run rack of the aero-engine, and obtaining rules such as product configuration information, size constraint information, assembly constraint information and the like required in the parameterization design process of the trial run rack in modes such as consulting technicians, design experience reasoning and the like;
further, the test run rack of the aero-engine is divided into four parts, namely a flow tube, a main fulcrum, an auxiliary fulcrum and an exhaust diffuser; classifying and sorting the collected knowledge through a design knowledge management module according to the divided modules according to the division of the test bed module, determining main parameters and auxiliary parameters in the design process, and storing the main parameters and the auxiliary parameters in a parameterized design knowledge base;
and establishing a design knowledge maintenance module for calling and modifying knowledge in the parameterized design knowledge base, and storing the updated knowledge in the parameterized design knowledge base again, so that the knowledge maintenance requirements for special products such as the test run rack of the aircraft engine are met.
S2: establishing connection between three-dimensional modeling software and the parameterized design knowledge base through a three-dimensional modeling interface module, calling design knowledge required in the parameterized design knowledge base, and automatically generating three-dimensional template models of all parts required by a product in the three-dimensional modeling software and storing the three-dimensional template models in the template base;
s3: inputting design information according to design requirements, and generating a product configuration file through a design scheme decision module; calling a corresponding template from the template library through a template selection calling module according to the product configuration file, and determining the template required by design;
s4: modifying the main parameters in the template model by using a parametric deformation design module, wherein the auxiliary parameters automatically change due to the constraint relation between the auxiliary parameters and the main parameters; and automatically updating the three-dimensional template model in three-dimensional modeling software and generating a two-dimensional engineering drawing to complete the parametric design of the product.
A design scheme decision module: firstly, the existing knowledge in a parameterized design knowledge base is used for generating a decision algorithm, then, when a user inputs design information such as the length of an engine, the diameter of an engine inlet section, the diameter of a tail nozzle of the engine and the like according to actual requirements, the restrictions such as the length of a test bed, the installation position and the like are comprehensively considered through the decision algorithm, a proper test run rack layout structure is selected, and a test run rack configuration file is generated after a design scheme is determined.
A template selection calling module: and selecting and calling template models required by design from a database according to the test bench configuration file so as to carry out parametric design.
A parameterization design module: the method comprises the steps of modifying main parameters such as the diameters and the total lengths of a flow tube and an exhaust diffuser in a template model, the sizes of a main fulcrum and an auxiliary fulcrum, the alignment position and the like, and automatically changing the auxiliary parameters due to the constraint relation between the auxiliary parameters and the main parameters. Automatically updating a three-dimensional template model in three-dimensional modeling software and generating a two-dimensional engineering drawing to meet design requirements;
the design steps include the following steps:
the method comprises the steps of inputting design information such as engine length, engine inlet section diameter and engine tail nozzle diameter according to design requirements, inputting design requirements of an aeroengine test bed, generating a product configuration file through a design scheme decision module, calling corresponding templates from a template library through a template selection calling module according to the product configuration file, determining templates required by design, enabling each template to have a corresponding parametric design interface, enabling a user to input parameters needing to be changed on the parametric design interface, automatically updating a three-dimensional model and generating a two-dimensional engineering drawing, and achieving parametric design of products.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A knowledge base-based parametric design method for an aircraft engine test run rack is characterized by comprising the following steps:
s1: establishing a parameterized design knowledge base;
s2: establishing a template by using a parameterized design knowledge base; establishing connection between three-dimensional modeling software and the parameterized design knowledge base through a three-dimensional modeling interface module, calling design knowledge in the parameterized design knowledge base, and automatically generating three-dimensional template models of all parts of a product in the three-dimensional modeling software and storing the three-dimensional template models in the template base;
s3: inputting design information according to design requirements, and generating a product configuration file through a design scheme decision module; calling a corresponding template from the template library through a template selection calling module according to the product configuration file, and determining the template required by design;
s4: modifying the main parameters in the template model by using a parametric deformation design module, wherein the auxiliary parameters automatically change due to the constraint relation between the auxiliary parameters and the main parameters; and automatically updating the three-dimensional template model in three-dimensional modeling software and generating a two-dimensional engineering drawing to complete the parametric design of the product.
2. The knowledge-base-based parametric design method for test-run gantries of aircraft engines according to claim 1, wherein the step S1 comprises the following steps:
s1.1: collecting product configuration information, size constraint information and assembly constraint information required in the parametric design process;
s1.2: the method comprises the following steps of carrying out module division on an aeroengine test bed, wherein the module division comprises four parts, namely a flow tube, a main fulcrum, an auxiliary fulcrum and an exhaust diffuser;
s1.3: the collected knowledge is classified and sorted by the design knowledge management module according to the divided modules, main parameters and auxiliary parameters in the design process are determined and stored in the parameterized design knowledge base.
3. The knowledge-base-based parametric design method for test-run racks of aircraft engines as claimed in claim 2, wherein the step S1 further comprises: and establishing a design knowledge maintenance module, wherein the design knowledge maintenance module is used for calling and modifying knowledge in the parameterized design knowledge base and storing the knowledge in the parameterized design knowledge base into the parameterized design knowledge base after updating.
4. The knowledge-base-based parametric design method for test-run gantries of aircraft engines according to claim 1, wherein the design requirements comprise: engine length, engine inlet section diameter and engine exhaust nozzle diameter; the main parameters include: the diameters and total lengths of the flow tube and the exhaust diffuser, and the sizes and row-to-row positions of the main fulcrum and the auxiliary fulcrum.
5. The knowledge-base-based aircraft engine test-run bench parametric design method according to claim 4, wherein the design scheme decision module generates a decision algorithm by using existing knowledge in the parametric design knowledge base, and when a user inputs design information of the engine length, the engine inlet section diameter and the engine tail nozzle diameter according to actual requirements, the decision algorithm comprehensively considers the limitations of the test bench length and the installation position, selects a proper test-run bench layout structure, and generates a configuration file of the aircraft engine test-run bench after the design scheme is determined.
6. The knowledge-base-based parametric design method for the test-run rack of the aircraft engine as claimed in claim 1, wherein the template selection and calling module selects and calls a template model required by design from the template base for parametric design according to the configuration file of the test-run rack of the aircraft engine.
7. The knowledge-base-based parametric design method for the test-run stand of the aircraft engine as claimed in claim 1, wherein the parametric design module is used for carrying out parametric design on product parts on the selected three-dimensional template model according to main parameters; and (4) changing the model by modifying the main parameters, and outputting the updated three-dimensional model and the two-dimensional engineering drawing.
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