CN101576440A - Virtual testing platform of liquid rock engine and testing method thereof - Google Patents
Virtual testing platform of liquid rock engine and testing method thereof Download PDFInfo
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Abstract
The invention discloses a virtual testing platform of a liquid rock engine and a testing method thereof, comprising a test manager module, a test object simulating module, an operation control module, a virtual environment module, a verification evaluating module and a database managing system. By determining a test object and a test proposal, the operation control module controls the simulation process of the test object simulating module, the virtual environment module performs three-dimensional display and entity mapping, the verification evaluating module evaluates a virtual test result, and the database managing system stores and manages data information, thus realizing the combination of the engine testing technology and the computer method, achieving the effect that the virtual testing platform serves as a seamless integrated system of a project, being led to be similar to true test operating practice, and being capable of having functions and performances similar to a true engine igniting test to a certain extent.
Description
Technical field
The present invention relates to a kind of liquid-propellant rocket engine virtual test platform and test method thereof, belong to engine virtual experiment technology field.
Background technology
At present, in many system development developments of China's Aero-Space and military field, the development of power system is mainly finished by ground experiment, and ground experiment is paid less material consumption with respect to flight test, it can avoid the defective on the engine design, optimizes engine performance etc.But ground experiment system versatility is poor, error accumulation is more, development process is very long and spend huge.Therefore, the experimental study of carrying out new model is to shortening the lead time of new model engine, and reduction is developed, testing expenses are significant.
Along with the development of spationautics, more and more higher to the cognitive need of the Performance Characteristics of engine complexity, also more and more harsher to the requirement of its experimental technique accordingly.Along with development of computer, for the modeling and simulating equipment of development test platform provides favourable instrument.Application simulation equipment to actual engine heat run simulate, can obtain the data that can't measure in the heat run process, can reduce the measuring error of engine, also can reduce engine R﹠D cycle and expense.
But, application simulation equipment is simulated process of the test, the mimic need carry out the numerical value management to heat run scheme, experiment process and test findings, perhaps a plurality of business softwares is carried out operational administrative, poor compatibility, inconvenient, very not directly perceived yet, so, need a comprehensive management platform badly, realize the integrated of mass data and software, can realize expression directly perceived, carry out the heat run process of engine system alternately.
Development along with computer technology, computer graphics and man-machine interaction theory, the all-around test stand that the applying virtual reality technology is set up under the virtual environment has had the technical foundation that can realize, it will demonstrate remarkable advantages and huge benefit at aspects such as the conceptual approach of new model power system, developments.
Summary of the invention
The objective of the invention is to overcome the deficiency and the defective of available engine test and emulation technology, a kind of virtual test platform is proposed, fundamentally changed the heat run mode of reseach of engine, increased the dirigibility of heat run, made the engine test virtual unit have bigger adaptability.
Liquid-propellant rocket engine virtual test platform provided by the invention mainly comprises test manager module, subjects emulation module, operation control module, virtual environment module, tests mould evaluation module and data base management system (DBMS).Adopt interface integrated technologies such as ADO between each module, make data message between each module, realize accessible transmission.
Wherein, the test manager module is that the experimenter is the engine that the test operation personnel carry out test operation, be used to determine testing program and subjects (engine system or its parts), the parameter of subjects is set, comprising: controlled variable, design parameter, environmental parameter, experimenter's information etc.Simultaneously, these data messages and testing program all are stored in the platform virtual test data base management system (DBMS).
The subjects emulation module comprises model and two parts of algorithm, constitutes subjects jointly, is the core of whole platform.After having determined testing program, the subjects emulation module is used to the course of work of simulation test object (that is: real engine system or its parts).It reads test configuration information and engine structure/state parameter information from data base management system (DBMS), loading algorithm carries out simulation calculation, obtains its operating characteristic parameter.The test findings that obtains is saved in the data base management system (DBMS) synchronously.
Operation control module is used for operation control subjects emulation module, comprises the operation control of engine virtual test flow processs such as startup, operation, continuation, speed governing, until obtaining test findings.
The virtual environment functions of modules is that the object information (as temperature, pressure, flow etc.) that will test is mapped on the three-dimensional entity model.Wherein, solid model refers to the pilot system of subjects (engine system or its parts), and relevant control system, Displaying Meter etc.Test findings information comprises two kinds of information of result of calculation of true test findings and subjects emulation module, and they all are stored in the data base management system (DBMS).In process of the test, display module will reading corresponding data be shown to the virtual instrument dial plate or show its corresponding animation effect (liquid flow, flame jet etc.) from data base management system (DBMS).The experimenter can carry out interactive operation to the three-dimensional entity model in the test scene according to demand, for example suspends, promptly stops, restarting etc., truly reflects the operating characteristic of engine and parts thereof; And can test repeatedly, but show the unlimited repetitive operation sexual function of virtual test platform.
The function of testing the mould evaluation module is to read the calculating test findings of true test findings and subjects emulation module from data base management system (DBMS) respectively, utilize various modelling verification algorithms (as the error analysis method, autoregressive method etc.), virtual test result's precision and degree of confidence are assessed.
Data base management system (DBMS) is OO Engineering Data Management System, be used for the information management of virtual test, all virtual tests and true test for data information all store in the data base management system (DBMS), comprising: the control information of test, the structural parameters of subjects, state parameter, test findings, checking result or the like.The application data base management system can be realized searching, insert, delete and storing of data, and the management of warranty test data and parameter, transmission and shared are the important foundations that supports virtual test.
The present invention combines The present computer technology with the engine test technology, the virtual test platform adopts trial system and data base management system (DBMS) to replace traditional heat run document management and numerical value management; Adopt interface integrated technology and platform framework structure to replace the present situation of traditional multiple simulation software independent technique; Utilize the three-dimensional modeling technology to build the virtual test environment, show that test findings replaces traditional true igniting and instrument shows; Adopt the real-time, interactive technology, virtual environment is carried out the operation control of process of the test.
The present invention also provides a kind of and uses above-mentioned test platform to carry out the concrete implementation step of test method of virtual test as follows:
Step 1, test manager module confirmed test scheme and subjects.
If there is this testing program in the data base management system (DBMS), then directly test routine is set according to the confirmed test scheme, information such as experimental enviroment, experiment process, subjects parameter, and be stored into data base management system (DBMS).If there is not the demand testing program in the data base management system (DBMS), new testing program then is set, and test routine is set, information such as experimental enviroment, experiment process, subjects parameter for new testing program, and be stored to data base management system (DBMS), be convenient to management to testing program.
Step 2, subjects emulation module carry out virtual test.This platform is divided three classes subjects at the liquid-propellant rocket engine test features: the test of (1) virtual component, (2) virtual engine unit or subsystems test, the test of (3) power system.Three class objects comprise layer by layer, so, adopt OO method to write universalization, modular component models program, just can make up the subjects of different levels arbitrarily.Every kind of parts are a generic module, mainly are made up of institutes such as the parts of type species such as tank, pipeline, valve, ejector filler, firing chamber, jet pipes.When carrying out the subjects virtual test, at first, judge and whether have the subjects system matrix in the subjects emulation module, if there is no, then, connect the subjects system of building, generate the first floor system matrix by each component class, read/call structural parameters in the data base management system (DBMS), state parameter, controlled variable etc. then, loading algorithm carries out simulation calculation; If there is the subjects system matrix in the subjects emulation module, then directly loading algorithm carries out emulation.
Step 3, process of the test operation control module by the control to the subjects emulation module, reach the purpose to test effect control in the middle of virtual real time execution process, promptly realize functions such as startup, operation, continuation, speed governing, until off-test.
Test simulation calculation result and historical true igniting outcome record in the mould evaluation module reading of data base management system, two kinds of result datas in the data base management system (DBMS) are compared calculating, adopt modelling verification algorithms such as error analysis method, virtual test precision and degree of confidence are assessed, and assessment result is stored in the data base management system (DBMS), being error etc. at last with the result shows with the form of curve.
By above-mentioned assessment result, judge whether the performance of engine meets the demands, if then finish this test; If not, then redesign testing program, begin to carry out again the experiment process operation from step 1.
The invention has the advantages that:
(1) can make things convenient for the multiple physical environment of virtual representation, replenish true heat run scheme;
(2) modularization emulation, the versatility of raising subjects;
(3) multicomputer technology and function are integrated, build versatility and application flexibility that seamless computer environment can be realized this platform;
(4) by Database Systems Test Information is carried out integrated management;
(5) can improve understanding, the performance of prognoses system under various complex conditions to physical process;
(6) can reduce the test error accumulation, increase the test figure sample, increase the assessment reliability of test model;
(7) also can reduce the test funds, shorten the test period, and the new model engine design is played indication and directive function;
(8) can be by software upgrading, update and strengthen capacity of equipment;
(9) can realize long-range test by network control.
Description of drawings
Fig. 1 virtual test platform structure synoptic diagram;
Fig. 2 uses the process flow diagram that virtual test platform of the present invention carries out virtual test.
Among the figure:
1. test manager module 2. subjects emulation modules 3. operation control modules 4. virtual environment modules 5. are tested mould evaluation module 6. data base management system (DBMS)s
Embodiment
The present invention is described in further detail with enforcement below in conjunction with accompanying drawing.
The present invention is a kind of liquid engine virtual test stage apparatus, as shown in Figure 1, described device comprises test manager module 1, subjects emulation module 2, operation control module 3, virtual environment module 4, checking evaluation module 5 and data base management system (DBMS) 6.Wherein test manager module 1 is carried out the selection of testing program, and the confirmed test object is provided with the parameter of subjects, and the parameter of described subjects comprises the controlled variable of engine, design parameter, environmental parameter, experimenter's information etc.
Described subjects emulation module 2 comprises model and two independent sectors of algorithm of engine components or system, is used to realize the virtual test to engine components or system.After having determined testing program, the subjects emulation module is used to the course of work of simulation test object (that is: real engine system or its parts), it reads test configuration information and engine structure/state parameter information from data base management system (DBMS) 6, obtain its operating characteristic parameter, start simulated program, the test findings that obtains is saved in the data base management system (DBMS) 6 synchronously.
Described operation control module 3 is used for the simulation process of subjects emulation module 2 is controlled, as startup, operation, continuation and the speed governing etc. of virtual test, until obtaining testing net result.
Described virtual environment module 4 is when carrying out virtual test, at first the environmental parameter in the data base management system (DBMS) 6 (as atmospheric temperature, atmospheric pressure etc.), subjects parameter etc. are imported in the three-dimensional virtual environment 4, promptly set up the mapping relations between realistic model and the physical surroundings, then the simulation result that obtains in the subjects emulation module is reached 3-D display in real time, just can simulate the scene of true engine ignition test.This platform adopts 3ds Max to each critical piece (tank of liquid-propellant rocket engine, pipeline, valve, ejector filler, the firing chamber, jet pipe etc.) and control desk etc. carry out 3 d geometric modeling, and employing .nmo file interface technology, in virtools with unit construction, adopt biulding block technology reading of data base management system 6, set up related with simulation result or true test findings the 3D solid in the virtual environment 4, test findings is shone upon on it, the heat run scene of engine that shows directly perceived is (as igniting, liquid flow, instrument shows), make things convenient for the experimenter to observe the virtual test result, and can carry out interactive operation to the test scene in these virtual environment modules 4 by the pseudo operation control panel, truly reflect the operating characteristic of engine and parts thereof; And can test repeatedly, but show the unlimited repetitive operation sexual function of virtual test platform.
Described checking evaluation module 5 will be according to true test findings in the data base management system (DBMS) 6 and virtual test result, utilize various modelling verification methods (as the error analysis method, autoregressive method etc.), precision and degree of confidence to the virtual test result are assessed, and test the simulation result that modeling method obtains and assess different, find and the net result of the true immediate simulation result of test findings as test.
Data base management system (DBMS) is OO Engineering Data Management System, be used for the information management of virtual test, all virtual tests and true test for data information all store in the data base management system (DBMS), comprising: the control information of test, the structural parameters of subjects, state parameter, test findings, checking result or the like.The application data base management system can be realized searching, insert, delete and storing of data, and the management of warranty test data and parameter, transmission and shared are the important foundations that supports virtual test.
Use above-mentioned virtual test platform, the present invention also provides a kind of engine virtual test method, and flow process specifically realizes as shown in Figure 2 as follows:
Step 1, test manager module confirmed test scheme and subjects.
According to test objective, the experimenter carries out the selection of testing program and determining of subjects (engine or its parts) by test manager module 1.If there is the set testing program of required virtual test object in the data base management system (DBMS) 6, then directly call this scheme, if there is no, then need to set new testing program, and it is saved in the data base management system (DBMS) 6.For the ease of management, the path of the work of test is set for the testing program of having determined, the parameter of subjects is set, comprise: controlled variable, design parameter, environmental parameter, experimenter's information etc., environmental parameter is set, and be stored in the data base management system (DBMS) 6, lay the first stone for further testing.
Step 2, subjects emulation module 2 carry out virtual test.
Subjects emulation module 2 calls the simulation parameter in the data base management system (DBMS) 6, and engine is carried out emulation, and is controlled by 3 pairs of engine simulation processes of operation control module.When carrying out the subjects virtual test, at first, judge whether there is the subjects system matrix in the subjects emulation module 2, if exist, then directly loading algorithm carries out virtual test; If there is no,, connect and build subjects, generate the first floor system matrix then by each component class; Read/call structural parameters in the data base management system (DBMS), state parameter, controlled variable etc. then, call corresponding model of engine components or system and algorithm, carry out simulation calculation according to the subjects of selecting.
Step 3,3 pairs of subjects emulation modules 2 of operational process control module are controlled, and comprising: operation such as startup, operation, continuation, speed governing control, and until off-test.
The virtual environment module at first imports to environmental parameter, subjects parameter etc. in the three-dimensional virtual environment, promptly set up the mapping relations between realistic model and the physical surroundings, then simulation result is reached 3-D display in real time, just can simulate the scene of true engine ignition test.Described 3-D display comprises the variation of physical phenomenon, the real-time update of measurement instruments such as flowmeter.The virtual environment module is set up related with simulation result or true test findings the 3D solid in the virtual environment, test findings is mapped on the 3D solid, the heat run scene (igniting, liquid flow, instrument show) that shows engine directly perceived, and can carry out interactive operation to these virtual test scenes by the pseudo operation control panel, truly reflect the operating characteristic of engine and parts thereof; And can test repeatedly, but show the unlimited repetitive operation sexual function of virtual test platform.
Checking evaluation module 5 will be saved to the measured value result who drafts measuring point in the data base management system (DBMS) 6, compare verification with the measuring point value of corresponding true test, historical data correction realistic model with true igniting, assessment result is saved in the data base management system (DBMS) 6, is convenient to check the result of various ways.By above-mentioned assessment result, judge whether the performance of engine meets the demands, if then finish this test; If not, then redesign testing program, begin to carry out again the experiment process operation from step 1, until meeting the demands.
So far, finish at a virtual test of a certain object.
Claims (4)
1, a kind of liquid-propellant rocket engine virtual test platform, it is characterized in that: comprise test manager module, subjects emulation module, operation control module, virtual environment module, test mould evaluation module, data base management system (DBMS), adopt ADO technology, biulding block interface integrated technology between each module, make data message between each module, realize accessible transmission;
Described test manager module is used for confirmed test scheme and subjects, and the parameter of subjects is set, and these data messages and testing program all are stored in the platform virtual test data base management system (DBMS);
Described subjects emulation module is used to the course of work of simulation test object, and is saved in the test findings that simulation process obtains in the data base management system (DBMS) synchronously;
Described operation control module is used for operation control subjects emulation module, until obtaining test findings;
Described virtual environment functions of modules is that the object information with virtual test is mapped on the three-dimensional entity model, and the experimenter carries out interactive operation to the test scene that three-dimensional entity model forms, and truly reflects the operating characteristic of engine and parts thereof;
Describedly test the mould evaluation module reads true test findings and subjects emulation module respectively from data base management system (DBMS) calculating test findings, utilize various modelling verification algorithms that virtual test result's precision and degree of confidence are assessed;
Described data base management system (DBMS) is used for the information management of virtual test, all virtual tests and True Data information all store in the data base management system (DBMS), comprise: the control information of test, the structural parameters of subjects, state parameter, test findings, checking result or the like, the application data base management system, realize searching, insert, delete and storing of data, the management of warranty test data and parameter, transmission and shared.
2, a kind of liquid-propellant rocket engine virtual test platform according to claim 1, it is characterized in that: described modelling verification algorithm is meant error analysis method or autoregressive method.
3, a kind of liquid-propellant rocket engine virtual test platform according to claim 1, it is characterized in that: the parameter of described subjects comprises: controlled variable, design parameter, environmental parameter, experimenter's information.
4, application rights requires the test method of 1 described a kind of liquid-propellant rocket engine virtual test platform, it is characterized in that following steps:
Step 1, test manager module confirmed test scheme and subjects;
If there is the testing program of required setting in the data base management system (DBMS), then directly test routine is set according to the confirmed test scheme, information such as experimental enviroment, experiment process, subjects parameter, and be stored into data base management system (DBMS); If there is not the demand testing program in the data base management system (DBMS), new testing program then is set, and test routine is set, information such as experimental enviroment, experiment process, subjects parameter for new testing program, and be stored to data base management system (DBMS), be convenient to management to testing program;
Step 2, subjects emulation module carry out virtual test;
When carrying out the subjects virtual test, at first, judge and whether have the subjects system matrix in the subjects emulation module, if there is no, then connect and build the subjects system matrix, according to the structural parameters in the data base management system (DBMS), state parameter, controlled variable etc., loading algorithm carries out simulation calculation then; If there is the subjects system matrix in the subjects emulation module, then directly loading algorithm carries out emulation;
Step 3, process of the test operation control module by the control to the subjects emulation module, reach the purpose to test effect control in the middle of virtual real time execution process, promptly realize functions such as startup, operation, continuation, speed governing, until off-test;
Step 4, virtual environment module are carried out the virtual test flow process in the three-dimension interaction environment;
The virtual environment module at first imports to environmental parameter, subjects parameter etc. in the three-dimensional virtual environment, promptly set up the mapping relations between realistic model and the physical surroundings, then simulation result is reached 3-D display in real time, simulate the scene of true engine ignition test;
Step 5, checking evaluation module are assessed simulation result;
Test simulation calculation result and historical true igniting outcome record in the mould evaluation module reading of data base management system, two kinds of result datas in the data base management system (DBMS) are compared calculating, adopt the modelling verification algorithm that virtual test precision and degree of confidence are assessed, and assessment result is stored in the data base management system (DBMS);
By above-mentioned assessment result, judge whether the performance of engine meets the demands, if then finish this test; If not, then redesign testing program, return step 1 and begin to carry out again the experiment process operation, until meeting the demands.
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