CN110555268A - Analysis software for main curve test data of relaxation modulus of solid propellant - Google Patents
Analysis software for main curve test data of relaxation modulus of solid propellant Download PDFInfo
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Abstract
the invention relates to analysis software for relaxation modulus main curve test data of a solid propellant, which comprises a file management module, a temperature offset factor calculation module, a W.L.F equation parameter solving module, a Prony series fitting module and a result output module, wherein the file management module is used for setting a working directory and importing the relaxation modulus test data; the temperature offset factor calculation module is used for setting a reference temperature and the number of moving points; the W.L.F equation parameter solving module is used for solving two coefficients of C1 and C2 of the W.L.F equation; the Prony series fitting module is used for setting the Prony series order to be fitted; and the result output module stores the data processing result into the working directory by selecting the data content of the WLF equation, the Prony series or the ANSYS command stream to be output. The method is a process of automatic drawing and optimal solution solving by a computer, greatly improves the data processing efficiency of the relaxation modulus test of the solid propulsion technology, avoids random errors caused by manual operation, and improves the data processing precision.
Description
Technical Field
the invention relates to the technical research field of solid rocket engines, in particular to analysis software for relaxation modulus main curve test data of a solid propellant.
background
In order to meet the requirements of high speed and high acceleration of future high-performance missiles, the specific impulse of the propellant of the solid rocket engine is continuously improved, the flight overload is continuously increased, and the adherent casting type engine with high filling fraction is more and more emphasized. Meanwhile, the problem of the structural integrity of the explosive column faced by the engine is gradually revealed. Aerojet company has counted 14000 many small and medium-sized solid missiles, the number of failures caused by the structural integrity failure of the explosive column accounts for 98.40% of the total number of engine failures, and the NASA (national NASA space vehicle design code) indicates that: the cause of a hot-commissioning or launch failure is mainly due to a breach of structural integrity. The problem of the structural integrity of the grain is not only related to the exertion of a rocket power system, but also affects the safety of the whole rocket weapon and a combat platform thereof. In order to accurately analyze the structural integrity problem of the grain in the production, transportation, storage and working processes of the solid rocket engine, a viscoelastic constitutive model for accurately describing the mechanical property of the solid propellant needs to be established. The theory of viscoelasticity mechanics can be divided into the linear viscoelasticity theory and the nonlinear viscoelasticity theory, and the latter theory is not applied in engineering at present due to the complexity of mathematical treatment; the linear viscoelastic material is characterized by the combination of linear elasticity and ideal viscosity, and has been widely applied to the analysis of the structural integrity of the grain. The general method for obtaining the actual mechanical property parameters of the propellant is to perform a stress relaxation test, namely: the propellant is made into a test piece with a certain specification, and tensile loading is carried out at a specific temperature. And (3) unloading part of the load by an automatic load-reducing mechanism along with the time to keep the total deformation constant, and measuring the reduction value of the stress along with the time to obtain the relaxation modulus. The solid propellant belongs to a high polymer, meets the time-temperature equivalence principle, and is equivalent to the viscoelasticity behavior of the solid propellant by raising the temperature and prolonging the observation time, so that a plurality of groups of test data under different temperature working conditions are generally collected and are processed according to the method in aerospace Standard QJ2487-93 to obtain a main curve of the relaxation modulus. However, this data processing requires that the test data is first logarithmized and then fitted to a primary curve. And translating the fitted straight line for multiple times by using a ruler in a manual drawing mode, and measuring the translation distance to obtain a main curve of the relaxation modulus. And solving parameters of the W.L.F equation, the coefficient of the Prony series and the like by utilizing linear regression or other data fitting modes. The test data processing is completed, manual drawing and translation are needed, data fitting software such as Origin is needed, and self-research programs are used alternately to preprocess the data. The processing mode is time-consuming and labor-consuming, errors of manual operation are large, and the data precision of the main curve is difficult to guarantee, so that the test data processing efficiency is low, and the precision of the main curve is insufficient. In view of the above reasons, the invention develops a solid propellant relaxation modulus main curve test data analysis software by adopting a computer and an object-oriented advanced programming technology, analyzes and screens the imported data, can automatically solve the relaxation modulus main curve, outputs parameters of a W.L.F equation and a plurality of coefficients of Prony series, can obviously shorten the pretreatment time for carrying out viscoelastic grain structural integrity analysis in finite element software, improves the data processing speed and precision, and further can provide important technical support for the structural design of a solid rocket engine grain.
At present, in China, a self-research program is usually used for preprocessing test data, then a straight line obtained by fitting is translated for multiple times in a manual drawing mode by means of a ruler, and then parameters of a W.L.F equation and multiple coefficients of a Prony series are solved by means of data fitting software such as Origin and the like. The processing of the relaxation modulus test data of the solid propellant has the following disadvantages: firstly, relaxation tests usually involve two variables of time and temperature, and in order to eliminate random errors in the test process, a plurality of test pieces are selected to be stretched at the same temperature at the same time, so that the data volume to be processed is multiplied. A large amount of test data are completely drawn in a manual dot drawing mode, and are translated for multiple times by means of a ruler, so that time and labor are wasted, and the processing efficiency is extremely low; secondly, when the straight ruler is used for translation, the curve to be translated needs to be horizontally moved to be overlapped with the target curve. The coincidence condition of the two curves cannot be guaranteed only by means of naked eye judgment and manual translation, and the accuracy of the translation distance directly influences the accuracy of the temperature deviation factor, so that the actual mechanical property parameters of the propellant are influenced. Therefore, random errors are easily introduced by manual operation, and the processing precision of test data cannot be guaranteed; third, the propellant relaxation modulus test data processing process involves multiple tools and lacks a fully functional data processing environment. Finishing a data processing work, namely performing preprocessing by means of a self-research program, manually drawing and translating on coordinate paper, performing parameter fitting by using Origin and other software, frequently performing data conversion and transmission, and easily causing artificial errors; finally, because the processing precision of test data cannot be guaranteed, in the actual development process of the solid engine grain, in order to guarantee the structural integrity and reliability of the solid engine grain, the design safety factor has to be improved, and in turn, the overall performance of the solid engine is reduced. In summary, the technical bottleneck has become one of the key factors restricting the effective improvement of the development level of the engine.
disclosure of Invention
The invention aims to provide analysis software for main curve test data of solid propellant relaxation modulus, so as to solve the problems of automatic drawing and optimal solution of the main curve test data of solid propellant relaxation modulus, avoid random errors caused by manual operation and improve data processing precision.
in order to solve the existing technical problems, the technical scheme adopted by the invention is as follows: the analysis software for the main curve test data of the relaxation modulus of the solid propellant comprises a file management module, a temperature offset factor calculation module, a W.L.F equation parameter solving module, a Prony series fitting module and a result output module, wherein the file management module is used for setting a working directory and importing the relaxation modulus test data; the temperature offset factor calculation module is used for finishing the calculation of the temperature offset factor by setting a reference temperature and the number of moving points and combining the imported relaxation modulus test data; the W.L.F equation parameter solving module is used for solving two coefficients of C1 and C2 of the W.L.F equation; the Prony series fitting module is used for fitting all coefficients of Prony series by setting the Prony series order to be fitted; and the result output module stores the data processing result into the working catalog by selecting the WLF equation to be output, the Prony series or the data content of an ANSYS command stream.
The invention relates to analysis software for testing data of a main curve of relaxation modulus of a solid propellant, which decomposes a test data processing process into a plurality of main steps of effective data screening, temperature offset factor calculation, W.L.F equation parameter solution, Prony series fitting and the like, packages all the steps into a module with a standard form, comprises a temperature offset factor calculation module, a W.L.F equation parameter solution module, a Prony series fitting module and a result output module, has an automatic abnormal data abandoning function, and guides engineering technicians to finish the test data processing process of the relaxation modulus of the solid propellant through friendly operations of interface parameter input, data template import and export and the like. The method enables engineering technicians to obtain the performance parameters of the composite propellant in a simple and universal mode, and provides data support for structural design of the engine grain and performance simulation of the grain.
The method is in accordance with the current situation of a domestic solid propellant relaxation modulus test data processing method, follows the development trend of high efficiency and informatization of the working process, and develops a set of solid propellant relaxation modulus main curve test data analysis software integrating an effective data screening function, a temperature offset factor calculation function, a W.L.F equation parameter solving function and a Prony series fitting function based on the requirement of the solid propellant actual mechanical property parameters in the solid propellant charge development process, so that the method strives to reduce the test data processing time and improve the data processing precision, further improves the solid propellant charge structure design and simulation efficiency, saves manpower, material resources and financial resources, shortens the product development period, and has important guiding significance for the promotion and development of the engine design technology.
advantageous effects
According to the invention, through the componentization packaging of the engineering data processing method, the self-research program and the normalized data processing flow, the traditional manual drawing point mapping and curve translation are converted into the processes of automatic computer mapping and optimal solution solving, so that random errors caused by manual operation are avoided, and the data processing precision is improved. In addition, the method connects the steps of temperature offset factor calculation, W.L.F equation parameter solution, Prony series fitting and the like in series, so that the data flow transmission among the steps is completely and automatically completed by a computer, the loose modulus test data processing efficiency of the solid propulsion technology is greatly improved, and the aim of fast and high-precision test data processing is fulfilled.
Drawings
FIG. 1 is a general framework of a main curve test data analysis software for relaxation modulus of solid propellant;
FIG. 2 is a main interface of a main curve test data analysis software for relaxation modulus of a solid propellant;
FIG. 3 is a temperature offset factor calculation module interface;
Fig. 4 w.l.f equation parameter solution module interface;
FIG. 5 Prony series fitting module interface;
FIG. 6 result output Module interface;
FIG. 7 shows relaxation modulus test data for a set of solid propellants;
FIG. 8 temperature offset factor calculation results;
Fig. 9 w.l.f equation parameter solution results;
FIG. 10 Prony series fit results;
FIG. 11 results output case;
FIG. 12 saved results file;
fig. 13 w.l.f equation parameter calculation results;
FIG. 14 fitting results of Prony series coefficients;
FIG. 15 ANSYS APDL command flow results.
Detailed Description
the invention is further described with reference to the following figures and examples:
as shown in fig. 1, the main curve test data analysis software overall framework of the relaxation modulus of the solid propellant. The software architecture is mainly divided into three levels: a technical support layer, a software interface layer and a service application layer. The technical support layer is the bottom technical principle of software operation; the software interface layer is a main software module which can be directly operated by a user; and the service application layer is a normal processing flow of the packaged test data.
as shown in fig. 2, the main curve test data analysis software main interface of the relaxation modulus of the solid propellant. The top of the interface is a menu bar which comprises four main module inlets such as a temperature offset factor calculation module (abbreviated as an offset factor in the figure), a W.L.F equation parameter solving module (WLF equation in the figure), a Prony series fitting module (Prony series in the figure) and a result output module (result output in the figure), and a plurality of basic function menus such as files and help, and the bottom of the interface is a parameter input box.
as shown in fig. 3, the temperature offset factor calculation module interfaces. In the interface, reference temperature and moving point number are required to be set, and after test data are imported through a file menu, temperature offset factor calculation can be completed.
As shown in fig. 4, the w.l.f equation parameters solve the module interface. In the interface, two parameters (C1 coefficient and C2 coefficient in the figure) of C1 and C2 of the W.L.F equation can be solved.
the Prony series fit the module interface as shown in fig. 5. In the interface, the Prony series order to be fitted (fitting order in the figure) is required to be set, so that all coefficients of the Prony series can be fitted;
as shown in fig. 6, the results output module interface. In the interface, the data content of WLF equation, Prony series or ANSYS command stream to be output is selected, and the data processing result can be stored in the working directory.
When the method is specifically implemented, firstly, software is started, and a software main interface is entered; setting a working directory through a file menu, and importing relaxation modulus test data; entering a temperature offset factor calculation module, inputting a reference temperature and the number of moving points, and obtaining a temperature offset factor logarithm value through calculation; fourthly, entering a parameter solving module of the W.L.F equation, and calculating to obtain two parameters C1 and C2 of the W.L.F equation; entering a Prony series fitting module, setting the Prony series order to be fitted, and fitting to obtain all coefficients of the Prony series order; and sixthly, entering a result output module, selecting the data content to be output, and storing the processing result into a working directory.
take a certain set of solid propellant relaxation modulus test data as an example. Firstly, starting software; secondly, setting a working catalog and importing the relaxation modulus test data, as shown in figure 7; thirdly, entering a temperature offset factor calculation module, inputting a reference temperature and the number of moving points, and triggering an offset factor button to obtain a logarithm value of the temperature offset factor, as shown in figure 8; step four, entering a W.L.F equation parameter solving module, triggering a 'W.L.F equation' button, and obtaining two parameters C1 and C2 of the W.L.F equation, as shown in figure 9; step five, entering a Prony series fitting module, setting the Prony series order to be fitted, and fitting to obtain all coefficients of the Prony series order, as shown in figure 10; and sixthly, entering a result output module, selecting data content to be output, namely saving the processing result in a working directory, wherein the processing result is shown in figure 11, and the saved file content is shown in figures 12, 13, 14 and 15.
The solid propellant relaxation modulus main curve test data analysis software disclosed by the invention is widely applied to the analysis and processing of solid propellant relaxation modulus main curve test data, lays a solid theoretical foundation for engine development work, greatly improves the design efficiency, greatly shortens the development time of engine grains and has an obvious application value.
Claims (1)
1. The utility model provides an analysis software of solid propellant relaxation modulus main curve test data, includes file management module, temperature excursion factor calculation module, W.L.F equation parameter solution module, Prony series fitting module and result output module, its characterized in that:
The file management module is used for setting a working directory and importing relaxation modulus test data;
The temperature offset factor calculation module is used for finishing the calculation of the temperature offset factor by setting a reference temperature and the number of moving points and combining the imported relaxation modulus test data;
The W.L.F equation parameter solving module is used for solving two coefficients of C1 and C2 of the W.L.F equation;
the Prony series fitting module is used for fitting all coefficients of Prony series by setting the Prony series order to be fitted;
And the result output module stores the data processing result into the working catalog by selecting the WLF equation to be output, the Prony series or the data content of an ANSYS command stream.
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| CN115618171A (en) * | 2022-06-06 | 2023-01-17 | 北京理工大学 | Propellant combustion balance product solving method based on homotopy algorithm |
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| CN109884288A (en) * | 2019-02-27 | 2019-06-14 | 哈尔滨工业大学 | Asphalt Prony series model determination method for parameter based on optimal slack time domain |
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Application publication date: 20191210 |