CN101281659A - Finite Element Modeling Method for Multi-Frame Integral Structural Parts - Google Patents

Finite Element Modeling Method for Multi-Frame Integral Structural Parts Download PDF

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CN101281659A
CN101281659A CNA2008100237897A CN200810023789A CN101281659A CN 101281659 A CN101281659 A CN 101281659A CN A2008100237897 A CNA2008100237897 A CN A2008100237897A CN 200810023789 A CN200810023789 A CN 200810023789A CN 101281659 A CN101281659 A CN 101281659A
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左敦稳
丁子昀
郭魂
徐锋
黎向锋
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Nanjing University of Aeronautics and Astronautics
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Abstract

本发明针对现有建立多框整体结构件有限元模型的方法准确性差,精度低,耗费大量的时间和精力,且依赖有经验的分析人员的现状,公开了一种多框整体结构件的有限元建模方法,它通过对多框整体结构件三维CAD模型主动简化,提取框体特征结构,依据框体特征结构建立有限元模型库,再按照多框整体结构件的实际形状,通过变换工作平面,由单框向多框逐渐过渡,动态的由单框结构件逐渐“拼接”形成多框结构件,最终确定多框整体结构件有限元模型。本方法具有准确性高、交互性好的特点,通过该方法有效的缩短有限元建模周期,既能体现多框整体结构件的计算力学理论,也使有限元模型在几何上更加精确于CAD模型。

Figure 200810023789

The present invention discloses a finite element model of a multi-frame integral structural part aimed at the current situation that the existing method for establishing a finite element model of a multi-frame integral structural part has poor accuracy, low precision, consumes a lot of time and energy, and relies on experienced analysts. The meta-modeling method, which actively simplifies the 3D CAD model of the multi-frame integral structure, extracts the frame feature structure, establishes the finite element model library according to the frame feature structure, and then transforms the work according to the actual shape of the multi-frame integral structure The plane gradually transitions from single frame to multi-frame, and the single-frame structural parts are gradually "spliced" dynamically to form multi-frame structural parts, and the finite element model of multi-frame overall structural parts is finally determined. This method has the characteristics of high accuracy and good interactivity. Through this method, the finite element modeling cycle can be effectively shortened, which can not only reflect the computational mechanics theory of multi-frame integral structural parts, but also make the finite element model more geometrically accurate than CAD Model.

Figure 200810023789

Description

多框整体结构件的有限元建模方法 Finite Element Modeling Method for Multi-Frame Integral Structural Parts

技术领域technical field

本发明涉及一种多框整体结构件的有限元分析方法,尤其是一种多框整体结构的有限元分析前的建模方法,具体地说是一种多框整体结构件的有限元建模方法。The invention relates to a finite element analysis method of a multi-frame integral structure, in particular to a modeling method before finite element analysis of a multi-frame integral structure, specifically a finite element modeling of a multi-frame integral structure method.

背景技术Background technique

随着航空工业的发展,现代飞机的性能要求不断提高,飞机的结构设计发生了较大的变化。从零件结构上来看,为了减轻重量,整体结构件在新机型中得到了尽可能多的应用,如机翼、整体壁板、大梁、隔框等。多框整体结构件不是由零件简单组合而成,而是利用整体毛坯加工而成。由于多框整体结构件具有外表光滑、重量轻的特点,在刚度、抗疲劳强度以及各种失稳临界值等方面均比铆接结构胜出一筹,因此在航空航天产品上作为主要承力结构件,得到了广泛的应用。因为航空多框整体结构件普遍具有结构复杂、薄壁、变厚度、曲面曲线结构多、协调精度要求较高等特点,目前都采用数控铣削的方法来进行加工。但是在铣削加工过程当中,由于切削力、切削热、零件刚度差等多种原因,很容易发生变形,因此急需对其变形规律进行计算机分析。With the development of the aviation industry, the performance requirements of modern aircraft have been continuously improved, and the structural design of aircraft has undergone major changes. From the perspective of part structure, in order to reduce weight, the overall structural parts have been applied as much as possible in the new model, such as wings, integral wall panels, girders, bulkheads, etc. The multi-frame overall structural parts are not simply assembled from parts, but processed from a whole blank. Since the multi-frame integral structure has the characteristics of smooth appearance and light weight, it is better than the riveted structure in terms of stiffness, fatigue resistance and various instability critical values, so it is used as the main load-bearing structural part in aerospace products. Has been widely used. Because aviation multi-frame integral structural parts generally have the characteristics of complex structure, thin wall, variable thickness, many curved surface structures, and high coordination precision requirements, etc., CNC milling is currently used for processing. However, in the milling process, due to various reasons such as cutting force, cutting heat, and poor rigidity of parts, deformation is easy to occur, so it is urgent to analyze the deformation law by computer.

对多框整体结构件铣削加工变形规律进行总结,需要大量的数据。如果完全靠试验来累计数据成本太高。为了解决这个问题,人们想到了利用有限元进行分析的方法。而利用有限元分析技术成功求解多框整体结构件铣削加工变形规律的关键前提是建立准确合理的多框整体结构件有限元模型。但利用有限元软件与CAD软件接口直接引入多框整体结构件CAD模型,往往导致模型的变化和产生过多庞大的节点数,以至于缺失数据,影响有限元分析的准确性和精度。而直接利用有限元软件建立多框整体结构件有限元模型又需要花费大量的时间和精力,而该有限元模型抽象化的过程在很大程度上又依赖于有经验的分析人员。因此,提出针对多框整体结构件有限元主动、快速、准确的参数化建模方法成为必然。在建模过程中根据多框整体结构件自身特征对其主动简化,寻求建模的规律,它能有效的缩短有限元建模周期,既能体现多框整体结构件的计算力学理论,也使有限元模型在几何上更加精确于CAD模型。Summarizing the deformation laws of milling machining of multi-frame integral structural parts requires a large amount of data. The cost of accumulating data entirely by experiments is too high. In order to solve this problem, people thought of the method of using finite element analysis. The key premise for successfully solving the deformation law of milling machining of multi-frame integral structural parts by using finite element analysis technology is to establish an accurate and reasonable multi-frame integral structural part finite element model. However, using the interface between finite element software and CAD software to directly introduce the CAD model of multi-frame integral structural parts often leads to model changes and excessively large number of nodes, resulting in missing data and affecting the accuracy and precision of finite element analysis. However, it takes a lot of time and energy to directly use finite element software to establish a finite element model of a multi-frame integral structure, and the process of abstracting the finite element model depends largely on experienced analysts. Therefore, it is necessary to propose an active, fast and accurate parametric modeling method for the finite element of the multi-frame integral structure. In the modeling process, according to the characteristics of the multi-frame integral structure, it is actively simplified to seek the law of modeling. It can effectively shorten the finite element modeling cycle, which can not only reflect the computational mechanics theory of the multi-frame integral structure, but also enable Finite element models are more geometrically accurate than CAD models.

发明内容Contents of the invention

本发明的目的是针对现有建立多框整体结构件有限元模型的方法准确性差,精度低,耗费大量的时间和精力,且依赖有经验的分析人员的现状,发明的一种通过对ANSYS二次开发,基于“框体拼接”建模法实现对多框整体结构件主动、快速、准确的参数化建立有限元模型的多框整体结构件的有限元建模方法。The purpose of the present invention is to solve the current situation that the existing method for establishing the finite element model of multi-frame integral structural parts has poor accuracy, low precision, consumes a lot of time and energy, and relies on experienced analysts. The second development, based on the "frame splicing" modeling method, realizes the active, fast and accurate parameterization of the multi-frame overall structural parts to establish the finite element model of the finite element model of the multi-frame overall structural parts.

本发明的技术方案是:Technical scheme of the present invention is:

一种多框整体结构件的有限元建模方法,其特征它主要包括以下步骤是:A finite element modeling method for a multi-frame integral structure, characterized in that it mainly includes the following steps:

第一步,简化框体结构,提取特征结构;The first step is to simplify the frame structure and extract the feature structure;

根据多框整体结构件的三维CAD模型,将组成多框整体结构件的每个框体主动简化成三边框或四边框的特征结构;所述的三边框特征结构是具有三角形特征的三边框或一边为曲边的曲边三边框,所述的四边框特征结构是具有四边形特征的四边框或一边为曲边的曲边四边框;According to the three-dimensional CAD model of the multi-frame overall structure, each frame forming the multi-frame overall structure is actively simplified into a three-frame or four-frame feature structure; the three-frame feature structure is a three-frame or four-frame feature structure with triangular features. One side is a curved three-sided frame, and the four-frame characteristic structure is a four-sided frame with a quadrilateral feature or a curved four-frame with one side being a curved side;

第二步,在计算机中建立特征结构的有限元模型库;The second step is to establish a finite element model library of the characteristic structure in the computer;

根据第一步的所得的特征结构,采用SHELL181壳单元建立对应的三边框有限元模型和/或四边框有限元模型;同时对所建的模型通过交互式输入该模型的几何参数和单元参数自动生成;模型的几何参数是指简化框体的长度、宽度、高度及关键点坐标;同时为所建的有限元模型提供多种交互式输入方法定义其几何参数,用户可根据多框整体结构件三维CAD模型提供的每个简化框体的相关数据,挑选最为简便的输入方法确定该框体的几何形状;According to the characteristic structure obtained in the first step, use SHELL181 shell element to establish the corresponding three-frame finite element model and/or four-frame finite element model; at the same time, interactively input the geometric parameters and element parameters of the model to the built model automatically Generate; the geometric parameters of the model refer to the length, width, height and key point coordinates of the simplified frame; at the same time, a variety of interactive input methods are provided for the built finite element model to define its geometric parameters. For the relevant data of each simplified frame provided by the 3D CAD model, select the most convenient input method to determine the geometric shape of the frame;

第三步,利用所建的特征结构进行拼接,直至得到一个周界与多框整体结构件三维CAD模型相吻合的拼接实体,再将各拼接实体的有限元模型转换成APDL宏文件,存入到ANSYS工作目录下,在ANSYS运行界面下调用该宏文件即可直接生成多框整体结构件的有限元模型。The third step is to use the built feature structure to splice until a spliced entity whose perimeter matches the 3D CAD model of the multi-frame overall structural part is obtained, and then convert the finite element model of each spliced entity into an APDL macro file and save it in Go to the ANSYS working directory, and call this macro file in the ANSYS running interface to directly generate the finite element model of the multi-frame overall structure.

所述的三边框特征结构由三个侧面和一个底面构成,四边框特征结构由四个侧面和一个底面构成。The three-frame characteristic structure is composed of three sides and a bottom surface, and the four-frame characteristic structure is composed of four sides and a bottom surface.

本发明的有益效果:Beneficial effects of the present invention:

本发明解决了利用有限元软件与CAD软件接口直接引入多框整体结构件CAD模型,往往导致模型的变化和产生过于庞大的节点数,以至于缺失数据,影响有限元分析的准确性和精度的问题;解决了直接利用有限元软件建立多框整体结构件有限元模型必须花费大量的时间和精力,而该有限元模型抽象化的过程在很大程度上又依赖于有经验的分析人员的问题。通过对ANSYS二次开发,基于“框体拼接”建模法建立多框整体结构件有限元模型,在建模过程中根据多框整体结构件自身特征对其主动简化,寻求建模的规律,它能有效的缩短有限元建模周期,既能体现多框整体结构件的计算力学理论,也使有限元模型在几何上更加精确于CAD模型,实现了主动、快速、准确的参数化建立多框整体结构件有限元模型。The present invention solves the problem of directly introducing the CAD model of multi-frame overall structural parts by using the interface between finite element software and CAD software, which often leads to changes in the model and excessively large number of nodes, so that missing data affects the accuracy and precision of finite element analysis. Problem; Solve the problem that it takes a lot of time and effort to directly use finite element software to establish a finite element model of multi-frame integral structural parts, and the process of abstracting the finite element model depends on experienced analysts to a large extent . Through the secondary development of ANSYS, the finite element model of multi-frame integral structural parts is established based on the "frame splicing" modeling method. During the modeling process, it is actively simplified according to the characteristics of the multi-frame integral structural parts, and the law of modeling is sought. It can effectively shorten the finite element modeling cycle. It can not only reflect the computational mechanics theory of multi-frame integral structural parts, but also make the finite element model geometrically more accurate than the CAD model, and realize the active, fast and accurate parametric establishment of multiple The finite element model of the whole frame structure.

附图说明Description of drawings

图1是本发明的多框整体结构件有限元建模软件结构框图。Fig. 1 is a structural block diagram of the finite element modeling software for multi-frame integral structural parts of the present invention.

图2是本发明的多框整体结构件有限元建模软件流程框图。Fig. 2 is a flow chart of the finite element modeling software for multi-frame integral structural parts of the present invention.

图3是本发明的简化后的特征结构的示意图。Fig. 3 is a schematic diagram of a simplified feature structure of the present invention.

图4是本发明的建模方法处理的一个具体零件的结构示意图。Fig. 4 is a schematic structural diagram of a specific part processed by the modeling method of the present invention.

具体实施方式Detailed ways

下面结合附图和实施例对本发明作进一步的说明。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

如图1~4所示。As shown in Figures 1 to 4.

一种多框整体结构件的有限元建模方法,它主要包括以下步骤是:A finite element modeling method for a multi-frame integral structure, which mainly includes the following steps:

第一步,简化框体结构,提取特征结构;The first step is to simplify the frame structure and extract the feature structure;

根据多框整体结构件的三维CAD模型,将组成多框整体结构件的每个框体主动简化成三边框或四边框的特征结构;所述的三边框特征结构是具有三角形特征的三边框或一边为曲边的曲边三边框,所述的四边框特征结构是具有四边形特征的四边框或一边为曲边的曲边四边框;如图3所法。According to the three-dimensional CAD model of the multi-frame overall structure, each frame forming the multi-frame overall structure is actively simplified into a three-frame or four-frame feature structure; the three-frame feature structure is a three-frame or four-frame feature structure with triangular features. One side is a curved three-sided frame, and the characteristic structure of the four-frame is a four-sided frame with a quadrilateral feature or a curved four-frame with one side being a curved side; as shown in Figure 3.

第二步,在计算机中建立特征结构的有限元模型库;The second step is to establish a finite element model library of the characteristic structure in the computer;

根据第一步的所得的特征结构,采用SHELL181壳单元建立对应的三边框有限元模型和/或四边框有限元模型;同时对所建的模型通过交互式输入该模型的几何参数和单元参数自动生成;模型的几何参数是指简化框体的长度、宽度、高度及关键点坐标;同时为所建的有限元模型提供多种交互式输入方法定义其几何参数,用户可根据多框整体结构件三维CAD模型提供的每个简化框体的相关数据,挑选最为简便的输入方法确定该框体的几何形状;所述的三边框特征结构由三个侧面和一个底面构成,四边框特征结构由四个侧面和一个底面构成。According to the characteristic structure obtained in the first step, use SHELL181 shell element to establish the corresponding three-frame finite element model and/or four-frame finite element model; at the same time, interactively input the geometric parameters and element parameters of the model to the built model automatically Generate; the geometric parameters of the model refer to the length, width, height and key point coordinates of the simplified frame; at the same time, a variety of interactive input methods are provided for the built finite element model to define its geometric parameters. For the relevant data of each simplified frame provided by the three-dimensional CAD model, the most convenient input method is selected to determine the geometric shape of the frame; the three-frame feature structure is composed of three sides and a bottom surface, and the four-frame feature structure is composed of four Consists of a side and a bottom.

第三步,利用所建的特征结构进行拼接,直至拼接形成与多框整体结构件周界相吻合的CAD模型,如图4所示,所述的多框整体结构件共有两个三边框、一个带曲边三边框、一个四边框、一个带曲边四框组合而成,由此即可得到由特征结构组合而成的多框整体结构件的有限元模型并将其转换成APDL宏文件,存入到ANSYS工作目录下,在ANSYS运行界面下调用该宏文件直接生成多框整体结构件的有限元模型。The third step is to use the built feature structure to splice until the splicing forms a CAD model that matches the perimeter of the multi-frame integral structural part. As shown in Figure 4, the multi-frame integral structural part has two three frames, A combination of three frames with curved edges, one frame with four frames, and one frame with four frames with curved edges, so that the finite element model of the multi-frame overall structural part composed of feature structures can be obtained and converted into an APDL macro file , and save it in the ANSYS working directory, and call this macro file in the ANSYS running interface to directly generate the finite element model of the multi-frame overall structure.

下面结合一个实例作进一步的说明:Here is an example for further explanation:

本发明可通过四个模块来实现,它们是:(1)模型绘制模块、(2)模型显示模块、(3)数据转换模块、(4)系统管理模块。其中模型绘制模块包括工作平面变换和模型库建立两部分。工作平面变换可实现工作平面平移、工作平面旋转和原点坐标查询等功能;模型库建立包括了参数化建立三边框、曲边三边框、四边框和曲边四边框等有限元模型的方法。模型显示模块可实现在VC++界面下的模型简图浏览、模型简图缩放、模型简图平移和屏幕坐标显示等功能。数据转换模块可实现将最终确定的多框整体结构件转换成APDL宏文件,并可实现对该宏文件的查看和修改。软件管理模块可实现用户密码管理、软件版本显示和帮助文档查看等功能。The present invention can be realized by four modules, which are: (1) model drawing module, (2) model display module, (3) data conversion module, (4) system management module. The model drawing module includes two parts: working plane transformation and model library establishment. The working plane transformation can realize the functions of working plane translation, working plane rotation and origin coordinate query; the establishment of the model library includes the method of parametrically establishing three-frame, curved-side three-frame, four-frame and curved-side four-frame finite element models. The model display module can realize the functions of model sketch browsing, model sketch zooming, model sketch translation and screen coordinate display under the VC++ interface. The data conversion module can realize the conversion of the finalized multi-frame overall structure into an APDL macro file, and can realize the viewing and modification of the macro file. The software management module can realize functions such as user password management, software version display and help document viewing.

用户在Windows 2000/xp环境下运行软件。首先显示的是软件登陆界面。软件登陆界面包含了软件版本信息及制作单位信息。用户成功输入软件密码可自动转入软件运行主界面,否则无权限运行本软件。Users run the software under Windows 2000/xp environment. The first display is the software login interface. The software login interface includes the software version information and production unit information. If the user successfully enters the software password, it can be automatically transferred to the main interface of the software operation, otherwise the software has no authority to run.

进入软件运行主界面后,用户从模型库工具栏中选择框体的类型,不同的框体类型提供了不同的交互式输入方法输入模型参数,用户可根据示例输入模型的相关参数,点击“确定”按钮之后建立的框体有限元模型简图会在图形显示窗口显示出来。After entering the main interface of the software operation, the user selects the type of frame from the model library toolbar. Different frame types provide different interactive input methods to input model parameters. The user can input the relevant parameters of the model according to the example, and click "OK The simplified finite element model of the frame created after the "button will be displayed in the graphic display window.

确定单个框体的有限元模型之后,按照多框整体结构件的实际形状,通过变换工作平面,继续按照上述步骤确定下一个框体的有限元模型。After determining the finite element model of a single frame, according to the actual shape of the multi-frame overall structure, by changing the working plane, continue to determine the finite element model of the next frame according to the above steps.

通过重复上述步骤,可最终确定多框整体结构件有限元模型。通过点击主界面上的“生成APDL文件”按钮,弹出生成APDL文件对话框,选择ANSYS的工作目录,输入ANSYS工作名和标题之后,点击对话框上“导出”按钮,将自动生成多框整体结构件有限元模型APDL宏文件APDLFile.mac且保存在ANSYS的工作目录下。用户可根据需要对该宏文件进行查询和修改。在ANSYS运行界面下调用该宏文件可直接生成多框整体结构件有限元模型。By repeating the above steps, the finite element model of the multi-frame integral structure can be finally determined. By clicking the "Generate APDL File" button on the main interface, a dialog box for generating an APDL file will pop up, select the ANSYS working directory, enter the ANSYS job name and title, and click the "Export" button on the dialog box to automatically generate a multi-frame overall structural part The finite element model APDL macro file APDLFile.mac is saved in the working directory of ANSYS. Users can query and modify the macro file as needed. Calling this macro file under the ANSYS running interface can directly generate the finite element model of the multi-frame integral structure.

图3和图4分别为利用本方法建立的多框整体结构件有限元模型简图和通过调用本方法生成的宏文件在ANSYS10.0界面下建立的多框体整体结构件有限元模型。Figure 3 and Figure 4 are the schematic diagram of the finite element model of the multi-frame integral structure established by this method and the finite element model of the multi-frame integral structure established under the ANSYS10.0 interface by calling the macro file generated by this method.

本发明未涉及部分均与现有技术相同或可采用现有技术加以实现。The parts not involved in the present invention are the same as the prior art or can be realized by adopting the prior art.

Claims (2)

1, a kind of finite element modeling method of many frames integral structure component, it mainly may further comprise the steps its feature and is:
The first step is simplified frame structure, extracts feature structure;
According to the three-dimensional CAD model of many frames integral structure component, each framework of forming many frames integral structure component initiatively is simplified to the feature structure of three frames or four frames; Described three frame feature structures are to have three frames of triangle character or be that on one side the Qu Biansan frame on bent limit, described four frame feature structures are to have four frames of quadrilateral feature or be the Qu Biansi frame on bent limit on one side;
Second goes on foot, and sets up the finite element model storehouse of feature structure in computing machine;
According to the feature structure of the gained of the first step, adopt the SHELL181 shell unit to set up corresponding three frame finite element models and/or four frame finite element models; Geometric parameter and the cell parameters that the model of being built is imported this model by interactive mode generates automatically simultaneously; The geometric parameter of model is meant length, width, height and the key point coordinate of simplifying framework; For providing multiple interactive input method, the finite element model of being built defines its geometric parameter simultaneously, the user can provide according to many frames integral structure component three-dimensional CAD model each simplify the related data of framework, select the geometric configuration that the easiest input method is determined this framework;
The 3rd step, utilize the feature structure of being built to splice, until obtaining the splicing entity that a circumference and many frames integral structure component three-dimensional CAD model match, finite element model with each splicing entity converts the APDL macro document to again, be deposited under the ANSYS working directory, under the ANSYS runnable interface, call the finite element model that this macro document can directly generate many frames integral structure component.
2, modeling method according to claim 1 is characterized in that described three frame feature structures are made of three sides and a bottom surface, and four frame feature structures are made of four sides and a bottom surface.
CN2008100237897A 2008-04-28 2008-04-28 Finite Element Modeling Method for Multi-Frame Integral Structural Parts Expired - Fee Related CN101281659B (en)

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Publication number Priority date Publication date Assignee Title
CN101923467A (en) * 2010-08-13 2010-12-22 沈阳黎明航空发动机(集团)有限责任公司 Method for model transmission among CAD (Computer-Aided Design) software, UG (Unigraphics) software and CAE (Computer-Aided Engineering) software
CN103177163A (en) * 2013-04-09 2013-06-26 常州工学院 Follow-up forecast method for milling deformation of complex integral structural components
CN105739958A (en) * 2014-12-10 2016-07-06 中国飞机强度研究所 Method for rapidly establishing overall framework finite element model
CN106354967A (en) * 2016-09-09 2017-01-25 北京航空航天大学 Turbine disk structure design and analysis integrated method
CN110020473A (en) * 2019-03-29 2019-07-16 常州市武进广宇花辊机械有限公司 The servo-actuated prediction technique of hot-rolling mill support construction machining deformation

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101923467A (en) * 2010-08-13 2010-12-22 沈阳黎明航空发动机(集团)有限责任公司 Method for model transmission among CAD (Computer-Aided Design) software, UG (Unigraphics) software and CAE (Computer-Aided Engineering) software
CN103177163A (en) * 2013-04-09 2013-06-26 常州工学院 Follow-up forecast method for milling deformation of complex integral structural components
CN105739958A (en) * 2014-12-10 2016-07-06 中国飞机强度研究所 Method for rapidly establishing overall framework finite element model
CN105739958B (en) * 2014-12-10 2019-02-15 中国飞机强度研究所 A kind of general frame finite element model method for fast establishing
CN106354967A (en) * 2016-09-09 2017-01-25 北京航空航天大学 Turbine disk structure design and analysis integrated method
CN106354967B (en) * 2016-09-09 2018-07-17 北京航空航天大学 A kind of turbine disc structure Integrated design and analysis method
CN110020473A (en) * 2019-03-29 2019-07-16 常州市武进广宇花辊机械有限公司 The servo-actuated prediction technique of hot-rolling mill support construction machining deformation

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