CN110276130B - Transmission system modeling design system and method - Google Patents
Transmission system modeling design system and method Download PDFInfo
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Abstract
The invention discloses a modeling design system and a method of a transmission system, relates to the technical field of mechanical design, and realizes construction of a two-dimensional topological model of the transmission system through component-type dragging-type modeling so as to determine the topological relation among units from power input to power output in the conceptual design stage of the transmission system. In the transmission system concept design stage, under the condition of not considering the space layout and the structural constraint of the system, the transmission series and the transmission form of the transmission system are determined, a topological structure model of the transmission system is established, and the transmission ratio distribution and the power flow calculation of the transmission system are carried out on the basis. The system and the method can quickly obtain the initial configuration scheme of the transmission system, remarkably improve the design efficiency of the transmission system and lay a foundation for the detailed design of the transmission system.
Description
Technical Field
The invention relates to the technical field of mechanical design, in particular to a transmission system modeling design system and a transmission system modeling design method.
Background
In the aspect of transmission system design, although China has made great progress in recent years, the gap between China and the foreign development level is still large. The basic weakness of the development of the domestic transmission system is low, the bottleneck technology restricting the development of the transmission system cannot be solved for a long time, the core technology of the development of the transmission system in the developed countries of the external cooperation of the Chinese and western countries is extremely confidential, and the relevant research of the configuration design is weak in the process of independently developing the transmission system, which is mainly shown in the following steps:
(1) the accumulated experience aiming at the design of the transmission system configuration is less, the introduction and the imitation are mainly used, and the criterion for guiding the design of the configuration is lacked;
(2) the traditional scheme has long design period and low design efficiency, cannot carry out rapid construction and evaluation of multiple schemes, is difficult to judge whether the scheme is optimal or not, and cannot realize effective utilization of design experience;
(3) the analysis of the advanced configuration technology of the transmission system and the efficient and reliable design tool are lacked, and the autonomous transmission system configuration design software is still blank at present in China.
Disclosure of Invention
The embodiment of the invention provides a transmission system modeling design system and method, which can solve the problems in the prior art.
The invention provides a transmission system modeling design system, which comprises a topological relation model modeling module and a power transmission path analysis module, wherein the topological relation model modeling module is used for constructing a transmission unit library and defining input and output interfaces among transmission units so as to realize the modeling of a topological relation model;
the power transmission path analysis module is used for converting the topological relation model into a graph theory model, and then searching the graph theory model to obtain the input power and the output power of the power transmission path and each transmission unit.
The invention also provides a modeling design method of the transmission system, which comprises the following steps:
constructing a transmission unit library, and defining input and output interfaces among transmission units so as to realize the modeling of a topological relation model;
and converting the topological relation model into a graph theory model, and searching the graph theory model to obtain the power transmission path and the input power and the output power of each transmission unit.
Compared with the prior art, the transmission system modeling design system and method provided by the invention have the advantages that:
(1) the problem of rapid design of a transmission system is solved by using a concept of configuration design, and the design is rapidly provided for the transmission system facing to a topological relation model;
(2) the accumulation and reuse of the design knowledge and experience of the transmission system are realized by constructing a transmission unit library and a configuration library;
(3) through the modeling of the topological relation model and the analysis based on the graph theory, the design scheme of the transmission system can be quickly obtained, the design efficiency is greatly improved, and a solid foundation is laid for the subsequent self-innovation design.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a transmission unit of the present invention;
FIG. 2 is a schematic diagram of a topological relation model in an embodiment of the present invention;
FIG. 3 is a adjacency matrix in an embodiment of the invention;
FIG. 4 is a topological relationship model and a corresponding graph theory model of the present invention;
FIG. 5 is a flowchart of a depth-first search method for power flow paths of a topological relation model according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be 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 invention provides a transmission system modeling design system which comprises a topological relation model modeling module and a power transmission path analysis module, wherein the topological relation model modeling module is used for constructing a transmission unit library, the transmission unit library mainly comprises a power input and output component, a cylindrical gear, a bevel gear, a planetary gear train, a bearing, a coupler, a clutch and other units, and an input and output interface between the units is defined after the transmission unit library is obtained, so that the topological relation model modeling is rapidly realized. The topological relation model modeling module comprises:
the configuration decomposition module is used for organizing the configuration forms of common transmission systems, such as parallel shaft transmission, staggered shaft transmission and the like, analyzing and decomposing the configurations to obtain main transmission unit types, and organizing the obtained transmission units into a transmission unit library. The transmission unit is managed in the form of the transmission unit library, and when the transmission units are added into the topological relation model from the transmission unit library, only corresponding transmission unit templates need to be copied into the topological relation model; the process of opening a topological relation model is divided into two steps, wherein the first step copies a template from a transmission unit library to the topological relation model, and the second step reads real parameter values of the transmission units and modifies and assigns values to corresponding parameters of the units.
An interface definition module for analyzing the connection relationship between the transmission units in the transmission unit library and determining the basic parameter P (P) of each transmission unit according to the function of each transmission unit1,p2,p3…) and setting default values for the transmission unit, e.g. the parameters of the spur gear are gear, normal module, pressure angle, helix angle, addendum coefficient, tip clearance coefficient, etc., i.e. P (z, m)n,αn,β,ha,hf…), determining the input/output interface I (I) of each transmission unit according to the connection relationship, connection form and connection point position between each transmission unit and other units1 A,i2 B,i3 A…), where A, B represents the type of input-output interface, abstracting the connection relationships of the input-output interfaces to connection relationships in a topological relational model. The small square part in fig. 1 is the interface of the transmission unit, for example, the cylindrical gear (upper left corner in fig. 1) has four interfaces I in totalC(Im 1,IS 2,Im 3,IS 4…) for coaxial connection (I), two of which are used for coaxial connection (I)S) Two for engagement (I)m)。
In the invention, the connection relation between the transmission units is defined as connection and meshing, wherein the connection represents the coaxial relation of the transmission units, and the meshing represents the gear tooth meshing of the gear unit. After the interfaces of the transmission units are determined, the interface definition module also defines a corresponding connectable interface set for each type of interfaces of the transmission units according to the connection form between the transmission units in the transmission system, for example, the connectable interface set of the A type interface is phiIA{IB,IC,ID…, and then mapping the physical connection relationships of the input-output interfaces to the connection relationships abstracted in the topological relationship model is accomplished by matching between the interface sets and the connection relationships to the interface types. For example, the cylindrical gear can only be meshed with the cylindrical gear and can be coaxially connected with other transmission units; then for cylindrical gears there is phiICm＝{ICm}，ФICS＝{ICS,IbS,IpS…, where C denotes a cylindrical gear, b denotes a bevel gear, and p denotes a planetary gear train.
And the modeling module is used for carrying out dragging type modeling on the topological relation model according to the defined transmission unit library and connecting the transmission units according to the input and output interfaces of the transmission units to form a complete transmission system topological relation model. When a topological relation model is established, the transmission units in the transmission unit library need to be reasonably selected, a corresponding connection relation is formed according to the connection requirements of the interfaces, and meanwhile, the requirements of input and output interfaces and power of the transmission units need to be met. When the interface 1 of the transmission unit a is to be connected with the interface 2 of the transmission unit b, if I isa1∈Фb2And Ib2∈Фa1Then the a and b units can form a connection relation; otherwise, a connection relationship cannot be formed. Meanwhile, a topological relation model is required to be detected to meet the overall design requirement of the transmission system, and the main indexes of the topological relation model are engine power, rotating speed, tail rotor power and rotating speed, main rotor power, rotating speed, engine number and the like. If the topological relation model meets the two conditions, the topological relation model is formed, and the topological relation model of the double-engine three-stage transmission helicopter transmission system is shown in figure 2.
The designed topological relation model unit can be placed in a configuration library for reference in the subsequent design process, and the configuration library can search key information in the design requirements to obtain a topological relation model building model meeting the design requirements. In the invention, the modeling module establishes a transmission unit library by using an object-oriented technology; a drawing board for graphical display is established for a topological relation model through inheritance development of CFlowChartEditor; meanwhile, a modeling environment of the topological relation model is established through the MFC and the BCGPControlBar, and the functions of drag-type modeling, unit attribute viewing and modification, configuration library retrieval, configuration reuse and the like can be completed.
The power transmission path analysis module is used for converting the topological relation model into a graph theory model, and then searching the graph theory model to obtain the input power and the output power of the power transmission path and each transmission unit, and the module comprises:
and the model conversion module is used for determining a conversion rule between the topological relation model and the graph theory model, converting the topological relation model into the graph theory model and obtaining an adjacency matrix of the graph theory model, as shown in fig. 3. The conversion rule is as follows: the transmission units are mapped to points in the graph theory model, and the connection relations in the topological relation model are mapped to lines in the graph theory model, as shown in fig. 4. According to the dotted line relation in the graph theory model, a corresponding adjacency matrix A can be obtained, wherein each row and each column in the adjacency matrix A represent a point, and an element a in the adjacency matrixijAnd whether a connecting line exists between the ith point and the jth point is shown, if so, the value is 1, and if not, the value is 0.
And the path searching module is used for searching the adjacent matrix by using a depth-first searching method to obtain a power transmission path of the transmission system, and obtaining the input power and the output power of each transmission unit through flow analysis based on graph theory. In the search process, the position of the power input/output component in the adjacency matrix is first determined, the first row of the row where the power input unit, such as the engine, is located is used as a starting point, the row where the power output unit, such as the main rotor and the tail rotor, is used as an end point, the search is performed by using a depth-first method, and then the size of the power value flowing in each unit is distributed according to the size of the power value of the engine, the main rotor and the tail rotor and the transmission path, and the search process is shown in fig. 5.
Based on the same inventive concept, the invention also provides a transmission system modeling design method, and the implementation of the method can refer to the implementation of the system, and repeated parts are not repeated.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. The transmission system modeling design system is characterized by comprising a topological relation model modeling module and a power transmission path analysis module, wherein the topological relation model modeling module is used for constructing a transmission unit library and defining input and output interfaces among transmission units so as to realize the modeling of a topological relation model;
the power transmission path analysis module is used for converting the topological relation model into a graph theory model, and then searching the graph theory model to obtain the power transmission path and the input power and the output power of each transmission unit;
wherein the topological relation model modeling module comprises:
the configuration decomposition module is used for organizing the configuration forms of common transmission systems, analyzing and decomposing the configurations to obtain the types of the transmission units, and organizing the obtained transmission units into a transmission unit library;
the interface definition module is used for analyzing the connection relation between the transmission units in the transmission unit library, determining the number and the form of the input/output interfaces of each transmission unit according to the connection relation, the connection form and the positions of the connection points between each transmission unit and other units, and abstracting the connection relation of the input/output interfaces into the connection relation in the topological relation model;
the modeling module is used for carrying out dragging type modeling on the topological relation model according to the defined transmission unit library and connecting the transmission units according to the input and output interfaces of the transmission units to form a complete transmission system topological relation model;
the power transfer path analysis module includes:
the model conversion module is used for determining a conversion rule between the topological relation model and the graph theory model, converting the topological relation model into the graph theory model and obtaining an adjacency matrix of the graph theory model;
and the path searching module is used for searching the adjacent matrix by using a depth-first searching method to obtain a power transmission path of the transmission system, and obtaining the input power and the output power of each transmission unit through flow analysis based on graph theory.
2. The modeling design system of the transmission system according to claim 1, wherein the interface definition module further defines a corresponding connectable interface set for each type of interface of the transmission unit according to the connection form between the transmission units after determining the interfaces of the transmission unit, and then performs mapping from the physical connection relationship of the input and output interfaces to the connection relationship abstracted in the topological relation model through matching between the interface sets and matching between the connection relationship and the interface types.
3. The modeling design system of the transmission system according to claim 1, wherein the modeling module selects the transmission units in the transmission unit library when building the topological relation model and forms corresponding connection relations according to the connection requirements of the interfaces, and simultaneously needs to meet the input and output interface and power requirements of the transmission units, and simultaneously needs to detect that the topological relation model meets the overall design requirements of the transmission system.
4. The driveline modeling design system of claim 1, wherein the conversion rules are: mapping the transmission units to points in the graph theory model, mapping the connection relations in the topological relation model to lines in the graph theory model, obtaining a corresponding adjacency matrix according to the point-line relation in the graph theory model, wherein each row and each column in the adjacency matrix represent one point, and elements in the adjacency matrix represent one pointa ij Is shown asiPoint and the firstjWhether a connection exists between the points is judged, if yes, the value is 1, and if not, the value is 0.
5. The modeling design system for a powertrain system of claim 1, wherein the search process first determines the position of the power input output member in the adjacency matrix, and searches using a depth-first method with the first column of the row of points where the power input unit is located as a starting point and the column of points where the power output unit is located as an ending point.
6. The modeling design method of the transmission system is characterized by comprising the following steps of:
constructing a transmission unit library, and defining input and output interfaces among transmission units so as to realize the modeling of a topological relation model;
converting the topological relation model into a graph theory model, and then searching the graph theory model to obtain a power transmission path and input power and output power of each transmission unit;
the topological relation model modeling is realized by the following method:
the configuration forms of common transmission systems are arranged, the configurations are analyzed and decomposed to obtain the types of transmission units, and the obtained transmission units are organized into a transmission unit library;
analyzing the connection relation among all the transmission units in the transmission unit library, determining the number and the form of input and output interfaces of all the transmission units according to the connection relation, the connection form and the positions of connection points among all the transmission units and other units, and abstracting the connection relation of the input and output interfaces into the connection relation in the topological relation model;
carrying out dragging type modeling of the topological relation model according to a defined transmission unit library, and connecting transmission units according to input and output interfaces of the transmission units to form a complete transmission system topological relation model;
the topological relation model conversion, the power transmission path and the input power and the output power search of each transmission unit are realized by the following modes:
determining a conversion rule between the topological relation model and the graph theory model, converting the topological relation model into the graph theory model, and obtaining an adjacency matrix of the graph theory model;
and searching the adjacent matrix by using a depth-first searching method to obtain a power transmission path of the transmission system, and obtaining the input power and the output power of each transmission unit through flow analysis based on graph theory.
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