Based on the FEA method for analyzing vibration characteristics of cyclic symmetric structures,the vibration characteristics of an aeroengine compressor disc was analyzed.The solid model and FEA model for cyclic symmetric analysis of the compressor disc were set up and computed using ANSYS software.The vibration characteristics of the compressor disc was analyzed based on the computation.The analysis results can be used as reference for optimization design and vibration safeness verification for this compressor disc.
Two concealed weapon detection methods based on image fusion are presented. The dual tree complex wavelet transform (DT-CWT) is used to image fusion processing because of its shift invariance and directional selectivity, and it is preferable to traditional discrete wavelet transform (DWT). The fusion rules based on multi-scheme are put forward in the gray visual image and millimeter wave image fusion. The DT-CWT is combined with color space to fuse color visual image and infrared image. Two experiments indicate that the concealed weapons are detected and the detail information of visible images is expressed clearly. And it also shows that DT-CWT is superior to DWT.
Based on TZK6026 CNC lathe tool post that as the research object,using SolidWorks2010 software to build 3D entity modeling.And then through the proprietary software interface input the 3D modeling into ANSYS Workbench to Build finite element model of the cutter saddle.Then use the ANSYS Workbench to analysis its thermal characteristics , in order to get the temperature distribution and thermal deformation of the cutter saddle.Error compensation for subsequent structural improvements designed to provide a basis. ForewordCutter saddle is an important part of the lathe, and its main role is to support and fixed knife.So it has the direct effect on cutting performance and efficiency of the machine.To a certain extent, the structure and performance of the lathe cutter saddle reflects the design and manufacturing standards of lathe.Cutter saddle not only must have good strength and rigidity to withstand the force of cutting, but also need to have good thermal properties in order to Reduce the thermal deformation, and ensure the accuracy and quality of cutting.So the Thermal Characteristics Analysis of CNC Lathe cutter saddle based on ANSYS come into people's vision.
Based on the FEA method for analyzing vibration characteristics of cyclic symmetric structures,the vibration characteristics of an aeroengine compressor blade-disc system was analyzed.The solid model and FEA model for cyclic symmetric analysis of the compressor blade-disc system were set up and computed using ANSYS software.The vibration characteristics of the compressor blade-disc system was analyzed based on the computation.The analysis results can be used as reference for optimization design and vibration safeness verification for this compressor blade-disc system.
This paper introduces MFC——a kind of program frame which based on Microsoft Visual C++,and ObjectARX——a kind of software which based on the Microsoft Visual C++ language is used to develop the AutoCAD.Discussing how to develop AutoCAD with MFC and ObjectARX together,and discussing how to use MFC in ObjectARX program and to choose dynamic link fashion,static link library fashion in details.
Presents and implements a kind of webpage styled PowerPoint courseware quiz for teachers' computer language courses. Not only powerful data access, the quiz page also has friendly and interactive interface which is manipulated by webpage scripts languages. This courseware quiz is developed for single user, but also should be for local network if slightly modified. All the key functionalities are implemented through PowerPoint VBA.
Various methods of rapidly utilizing 3D resource in the development of the virtual circumstance system were introduced. It is necessary that complicated model were built in the development of virtual circumstance system and it is inconvenient to program only with the OpenGL functions. Thus, two flexible ways to the question including reading 3D documents and conversion of 3D documents were provided. The primary method of how to deal with and build complicated model in the virtual circumstance was analyzed. The realization of digital-lathe simulation was described in details.
Aiming at the difficulty of extracting fault features on the aircraft landing gear hydraulic system, traditional feature extraction methods rely heavily on expert knowledge, and the accuracy of fault diagnosis is difficult to guarantee. This paper combined convolutional neural network (CNN) and support vector machine classification algorithm (SVM) to propose a fault diagnosis model suitable for aircraft landing gear hydraulic system. The diagnosis model adopted the one-dimensional multi-channel CNN network structure, took the original pressure signal of multiple nodes as input, adaptively extracts the feature value of the pressure signal through CNN, and built a multi-feature fusion layer to realize the feature fusion of the pressure signal of each node. Finally, input the fused features into the SVM classifier to complete the fault classification. In order to verify the proposed fault diagnosis model, a typical aircraft landing gear hydraulic system simulation model was built based on AMESim, and several typical fault types such as hydraulic pump leakage, actuator leakage, selector valve clogging and accumulator failure were simulated, and corresponding Fault type data set, and use overlapping sample segmentation for data enhancement. Experiments show that the diagnosis accuracy of the proposed fault diagnosis algorithm can reach 99.25%, which can realize the adaptive extraction of the fault features of the aircraft landing gear hydraulic system, and the features after multi-dimensional fusion have better discrimination, compared with traditional feature extraction methods more effective and more accurate.
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