Secondary Development Technology Research Articles

Design and Implementation of Automatic Drawing System for Geological Section

The geological section map uses the specified geological elements to express the characteristics and attributes of the geological body at a certain depth below the section line. By analyzing the functional requirements of the automatic geological section drawing system, the structure and functional modules of the system are designed in detail. The system was developed with AutoCAD as the platform and C# as the development language with the help of CAD secondary development technology. Taking the geological section of Xishimen iron ore mine as an example, the system proved to be efficient in drawing the section, and significantly improved the speed and quality of the section drawing.

Three-Dimensional Design Method of Overhead Transmission Line Based on BIM Technology

Because of the high complexity and large scale of transmission line engineering, a large amount of data will be generated in the traditional two-dimensional (2D) design process, and the work of each stage is relatively independent. The design results are difficult to be effectively managed and integrated, and timely information interaction within and between specialties can not be achieved. BIM (Building Information Modelling) technology has powerful functions of digitalization and information management. This paper studies the application of BIM technology in three-dimensional (3D) design of overhead transmission lines. With the help of Revit platform and secondary development technology, combined with “Xinfu 110 kV transmission and transformation” project, a standardized family library of overhead transmission lines is established, and a set of algorithms for automatic sorting of insulator strings and automatic generation of overhead lines are developed, which realizes the parametric design of the lines in 3D environment. The whole process is centered on BIM information model database, which solves the problem of information management and interaction in traditional 2D design, and improves the design efficiency and quality.

The Research on Approach of BIM-Based 3D Design for Transmission Line Project

BIM (Building Information Modelling) technology has the advantages of visualization and informatization. But BIM technology is mainly used in the construction field, and the application of BIM technology in transmission project is less. This paper research the application of BIM technology in the three-dimensional design of transmission lines. Based on the Revit platform and using secondary development technology, the parameterized model library of transmission line was built by Revit, such as work wells, cable trenches and towers, and the three-dimensional curve fitting algorithm was applied to design the path of the transmission line, and finally the three-dimensional digital model of the transmission line was built. The research results in this paper can provide a new method for 3D design in the field of transmission project.

The Application of Computer Bim Assisted Secondary Development Technology in The Structural Design of Prefabricated Subway Station

In view of the demand for collaborative management in subway station engineering construction, this paper, by referring to the experience of manufacturing industry development, attempts to introduce the synergic and virtual manufacturing concepts that have been successfully used in manufacturing industry into subway station construction engineering, and discusses the integrated collaborative design mode and implementation path of BIM based railway station construction from macro to micro. The concept of prefabricated building and the characteristics of BIM technology can complement each other in comprehensive coordination and many other aspects. The deep integration of the two is conducive to the rapid development of industrialization, information technology and intelligence in the field of subway construction[1].

Variant design of typical aircraft parts based on CATIA technology

In order to improve the efficiency of product design, the component framework technology was studied. With the help of CATIA secondary development platform, the variant design of typical aircraft parts was realized on the basis of parametric modeling technology, the feature information was extracted quickly, and the intelligent operation was realized. By using object-oriented programming language, a variant design module integrated with CATIA system is developed to improve the design efficiency of typical aircraft parts. Taking the tie rod in the typical aircraft parts as an example, the verification of the variation design method shows that using CATIA secondary development technology and CAA programming tools, the parametric modeling of typical aircraft parts can be achieved to achieve the variation design.

Analysis method of water inrush for tunnels with damaged water-resisting rock mass based on finite element method-smooth particle hydrodynamics coupling

During drilling and blasting construction, a water inrush can be caused by damage to a water-resisting rock mass. Tunnel water inrush is a common anthropogenic geological hazard in engineering. The traditional finite element method (FEM) is less accurate in dealing with large deformation problems, and the Discrete element method (DEM) cannot realize engineering scale operation. In this study, the Johnson-Holmquist damage constitutive model was adopted, based on the LS-DYNA secondary development technology. A fluid grid was used in the blast damage area, and smooth particle hydrodynamics (SPH) were introduced to simulate the fluid. The far area of the tunnel is calculated by solid grid, forming a coupled algorithm of FEM and DEM. Based on a case study of the Yonglian Tunnel, this study simulated the evolution of a tunnel water inrush under the action of blasting. Through contrastive analysis, the numerical simulation results for the water inrush owing to damage to the water-resisting rock were found to correspond to those found using field tests. Therefore, this method can provide reference for underground engineering construction.

Characteristics of bubble motion and distribution in a multiphase rotodynamic pump

The characteristics of bubble motion and distribution in multiphase pumps are complex and have not yet been clearly described. In this study, high-speed photography technology was used to investigate the gas-liquid flow in detail. A numerical model that considers bubble coalescence and breakup was developed based on Euler two-fluid model, and it was embedded in ANSYS-CFX software with secondary development technology. The reliability of the developed model was validated by comparison with the efficiency and head of the test pump as well as the distribution and size of bubbles. The experimental results revealed that bubbles in the impeller moved from the blade pressure surface to the blade suction surface along a similar path, and accumulated there. Then, the accumulated bubbles decreased in size as they hit the blade wall. The necessary condition for bubble accumulation at the impeller hub was obtained by numerical analysis. The force acting on the bubble, M1, which is caused by the pressure difference from the shroud to hub of the impeller, must be much greater than the sum of the centrifugal force fg and lift force Lg (M1 ≫ fg + Lg). Furthermore, the bubble diameter in the guide vane was significantly greater than that in the impeller due to the strong bubble coalescence. At IGVFs of 3.0%, 9.0%, and 15.0%, the bubble diameters in the guide vane increased by 0.03 mm, 0.21 mm, and 0.24 mm, respectively.

CAD secondary development technology based on. NET API

AutoCAD secondary development technology plays an increasingly important role in engineering practice. It can help drafters free from heavy and repetitive tasks and is suitable for different engineering fields. This article details the implementation of secondary development based on the. NET API. This method makes it easier to develop the various plug-ins we need, and to draw various graphics accurately. This paper introduces the development of CAD plug-ins, the drawing of graphics, and the connection between CAD and database. Through the actual development and application, it can be found that the C#-based. NET API technology can easily realize the secondary development of CAD, and the method is easy to grasp and has strong practicability, which can greatly improve work efficiency.

Research on Modeling Method of 3D Geological Entity Model Based on BIM

The paper uses the BIM design platform Revit as the main program for modeling and debugging, relying on Lizheng survey drilling data, based on the Revit API secondary development technology and its modeling method, to carry out various algorithms involved in 3D geological modeling .The program design realizes automation and rapid establishment of 3D geological entity model, and enables it to have more comprehensive geological information query, section analysis and other functions. At the same time, in order to solve the problems of insufficient original borehole data or uneven borehole distribution, the paper proposes a virtual borehole generation method based on the moving quadric surface fitting interpolation algorithm, which effectively improves the modeling accuracy and the visualization effect of the model.

A General Integrated Method for Design Analysis and Optimization of Missile Structure

In the demonstration phase of a missile scheme, to obtain the optimum proposal, designers need to modify the parameters of the overall structure frequently and significantly, and perform the structural analysis repeatedly. In order to reduce the manual workload and improve the efficiency of research and development, a general integrated method of missile structure modeling, analysis and optimization was proposed. First, CST (Class and Shape transformation functions) parametric method was used to describe the general structure of the missile. The corresponding software geometric modeling and FEM (Finite Element Method) analyzing of the missile were developed in C/C++ language on the basis of the CST parametric method and UG (Unigraphics) secondary development technology. Subsequently, a novel surrogate model-based optimation strategy was proposed to obtain a relatively light mass missile structure under existing shape size. Eventually, different missile models were used to verify the validity of the method. After executing the structure modeling, analysis and optimization modules, satisfactory results can be obtained that demonstrated the stability and adaptability of the proposed method. The method presented saves plenty of time comparing to the traditional manual modeling and analysis method, which provides a valuable technique to improve the efficiency of research and development.

Study and implementation of a variable parameter modeling for die casting mold generation

Aiming at the problems in the process of the modeling of die casting mold, such as the discretization of design parameters, the complexity of detail modification, and the variation of design information because of the difference of description and organization method, a variable parameter modeling idea is proposed. Firstly, the feature analysis and abstraction of each module are carried out to obtain semantic units that are easy to be described by computer language. Secondly, the modeling principle, parameter representation, and implementation algorithm of some units are described in detail. Lastly, each unit is subdivided into multiple semantic units according to the design priority, and the pouring semantic model library is constructed. Combined with extend parametric design techniques, secondary development technology, and VC++ language, the complete expression of gate, sprue, and the whole overflow system is realized on UG platform. The operating results of the system in the cooperative enterprise show that the method has good accuracy, high efficiency, and wide adaptability in the design of many complex die castings and can effectively shorten the development cycle.

Design and Implementation of Software Simulation System for Dental Orthodontic Robot

With the development of society and the improvement of living standards, people’s pursuit of their own beautiful appearance is getting higher and higher, especially the passion for beautiful features. Therefore, the demand for dental orthodontic surgery is growing in daily life. However, due to the limitations of oral physiological structure, the orthodontic brackets designed in traditional orthodontic surgery are often not the optimal dental arch shape for patients. Therefore, a dental orthodontic software system that can interactively simulate a patient’s oral model is particularly important. In this paper, a software system of dental orthodontic robot which can simulate dental orthodontics was developed by using Blender secondary development technology combined with orthodontics and tooth extraction algorithm.

Development of Green Tide Monitoring with Satellite Images

Wang, R.F.; Zhang, Y.; Li, J.G.; Zhao, W.; Wang, F.Z.; Cao, H.J., and Duan, Y.P., 2019. Development of green tide monitoring with satellite images. In: Jung, H.-S.; Lee, S.; Ryu, J.-H., and Cui, T. (eds.), Advances in Remote Sensing and Geoscience Information Systems of Coastal Environments. Journal of Coastal Research, Special Issue No. 90, pp. 104-111. Coconut Creek (Florida), ISSN 0749-0208.Since the large-scale bloom in 2008, green tide, as a marine natural disaster, happens every year along the coast of Qingdao. It brings huge economic losses to society every year. Therefore, it is urgent to monitor the green tide in real time to obtain its dynamic information. Generally, researches on green tide are mainly focused on the coverage area. For Operational Application of Disaster Emergency Response, the influence range of the green tide is what people is concerned about. The influence range of the green tide can not only give information about the gaps between small green tide patches but also show the trend of development of greed tide. The research is mainly about the influence range of the green tide. An algorithm is designed for extracting the green tide distribution boundaries automatically. Principle of the algorithm is based on mathematical morphology dilation/erosion operation. This paper mainly improves in the following aspects: the partition of the green tide blocks, the accurate and efficient extraction of the distribution range and distribution contour of the green tide, and the filtering of the island. Since green tide mainly bursts along the Qingdao Coast and there is no established system so far, a system for monitoring green tides is established. On the basis of IDL/GIS secondary development technology, the system integrated environment of RS and GIS. It can be used for remote sensing monitoring and information extraction. Optical sensor data and microwave sensor data are used in this system. Special processing flow and algorithms for extracting information are designed based on the different characteristics of these data. Without using this system, a complete data process from beginning to ending needs 2 hours, but it can be finished in 10-15 minutes now in this system. The system runs smoothly and successfully in the State Oceanic Administration for three years till now.

Thermal damage analysis of aircraft composite laminate suffered from lightning swept stroke and arc propagation

Lightning strike is a complicated process involving multi-field coupling. In order to investigate the thermal damage mechanism of carbon fiber reinforced composites subject to lightning swept stroke, a complete numerical method is presented. Numerical model of lightning discharge is established based on Magneto Hydro Dynamics (MHD) and calculated by FLUENT secondary development technology. Considering aerodynamic flow effect, channel formation and evolution process during lightning discharge is analyzed for lightning current waveform A. Thermal-electric Coupling model is presented according to Radial Basis Function (RBF) interpolation theory, which is implemented by compiling program to make lightning current and heat energy inject into composite laminate. Consequently, damage mechanism of composite laminate under lightning swept stroke is studied based on the coupled numerical model and element deletion method. Ablation damage morphology of composite laminate is analyzed to understand plasma expansion and reattachment in arc root. The results show that aerodynamic flow makes the lightning channel move fast and composite laminate is deteriorated due to thermal damage.

Studying on Conversion of Oblique Photogrammetry Data Based on OSG and ARX

Oblique photogrammetry data processing is a hotspot of current urban 3D model application research. Aiming at the problem that oblique photogrammetry data can not be directly loaded and displayed on AutoCAD, based on OSG 3D rendering engine and ARX secondary development technology, take the OSGB data into the DWG file as an example, this paper analyzes the oblique photogrammetry data format and the organization of the DWG model on AutoCAD and summarizes a conversion method of oblique photogrammetry data. The example shows that the method introduced in this paper can correctly realize the conversion of the oblique photographic data, and provides a reference for more industries to apply oblique photogrammetry data.

Hot Deformation Behavior of Q345 Steel and Its Application in Rapid Shear Connection.

The high-temperature deformation behavior of Q345 steel is detected by a Gleeble-3800 thermal simulator. The Arrhenius constitutive equation for high-temperature flow stress and the dynamic recrystallization model are constructed. With the secondary development technology, customized modifications are made on existing Deform-3D software. The constructed constitutive model and dynamic recrystallization model are embedded into Deform-3D to realize the secondary development of Deform-3D. The grain size and volume percentage distribution of dynamic recrystallization are obtained by simulating the shear connection process at high temperature and high speed. The results show that the constitutive equation and the dynamic recrystallization model constructed in this paper can be used to predict the evolution of the microstructure. The difference between the prediction results and the experimental data is about 3%. The accuracy of Arrhenius constitutive equation, dynamic recrystallization model and the feasibility of software secondary development are verified.

Study on the Seamless Integration Technology of Oblique Photography Real-time Model Base on AutoCAD

The application of oblique photography real-time model is more and more extensive in recent years. In order to meet the demand of putting oblique photogrammetry data in AutoCAD for displaying and editing in the land and planning departments, aimed at the characteristics of AutoCAD and oblique photography real-time model, this paper discusses the key integration technology of oblique photography real-time model and AutoCAD based on the secondary development technology of OSG and ARX, such as the oblique photography model data conversion and the fast dynamic LOD display of oblique photography real-time model based on the secondary development technology of OSG and ARX. The applied example shows that the method proposed in this paper is suitable for the analysis and display of the oblique photography real-time model directly in AutoCAD, and provides a certain reference value for the application of oblique photography reality model for the S/M units.

An Alternative Solution of Train‐Track Dynamic Interaction

Train‐track interaction (TTI) is a classic research topic in railway engineering, which consists of three main parts, namely, train model, track model, and wheel‐rail interaction. To improve the computational accuracy and broaden the application range, an alternative calculation method to investigate TTI based on secondary development technology of the commercial software ANSYS through APDL language is introduced in this article. Primarily, the train‐track interaction theory is briefly presented. On this basis, TTI is programmed and implemented on the computing platform of ANSYS by fully taking the nonlinear wheel‐rail interaction into consideration. In this calculation method, the train model, which is established based on multibody dynamics theory and solved by an advanced explicit integration method, is programmed into ANSYS through APDL language, while the track part is simulated according to finite element theory. Then, the proposed calculation method is validated with field test results to verify the validity. Finally, a numerical demonstration is conducted employing the present method. Results show that the introduced method is effective and able to investigate TTI. Different complicated track systems can be accurately simulated employing this method. Moreover, this method is also adoptable to explore train‐bridge interaction and train‐track‐bridge interaction.

Springback Coefficient Research of API X60 Pipe with Dent Defect

Dent is a common form of defect on oil and gas pipeline. Some dents will undergo elastic or plastic recovery due to changes in internal pressure, also known as springback. To analyze the springback law of an API X60 pipeline with a dent defect, the secondary development technology of finite element software ABAQUS was used for parametric modeling of a dented pipeline. Using this model, the effects of various factors (wall thickness, internal pressure, indenter size, dent location, and dent depth) on the springback coefficient of a dented pipeline were analyzed. The significance of each factor was analyzed by combining an orthogonal experimental design with the Grey correlation degree. Finally, nonlinear regression analysis was used to obtain formulas for the springback coefficient as a function of the influential factors. The results show that the springback coefficient of the dented pipeline after pressurization was between 0.15 and 0.65, and the factor that had the largest effect on the springback coefficient was the dent location. The springback coefficient of the dented pipeline after de-pressurization was between 1.1 and 1.5, and the factor that had the largest effect on the springback coefficient was the internal pressure. The formulas that relate the springback coefficient and various influential factors can be used as a reference for estimating the springback of dented pipelines.

Application of a non-uniform bubble model in a multiphase rotodynamic pump

Thus far, the break-up and the coalescence of bubbles have never been considered in the simulations of the multiphase pumps, while the non-uniform bubble model (NUBM) considered in this study has been successfully applied to predict the external characteristics, phase interaction and internal flow characteristics of a multiphase rotodynamic pump. On the basis of the Euler two-fluid model, the drag model considered to be the most important phase interaction model was modified using the secondary development technology of ANSYS CFX 16.0. The correctness of the modified drag model and that of the applied NUBM were verified by comparing with the experimental data at different inlet gas void fractions (IGVFs). When the IGVF was 21%, the relative errors of the pump heads with CD_0.34, CD_SN, and CD_modified were 10.30%, 8.19% and 1.43%, respectively. Meanwhile, the comparative results with and without NUBM showed a small difference in the corresponding interphase forces (drag, added mass force, and lift) under the relatively small IGVF condition (IGVF = 3%), while the difference became obvious under a large IGVF condition (IGVF = 15%).