Data Exchange Method Research Articles

Dynamic Fluid-Structure Coupling Method of Flexible Flapping Wing for MAV

AbstractThis paper presents a numerical method to simulate the dynamic interaction between the structural deformation and the aerodynamic characteristics of flexible flapping wing for micro air vehicle (MAV). A fluid-structure coupling solver is developed based on the Navier-Stokes equations and the structural dynamic equations. In addition, the interface data exchange method based on the radial basis function and the moving mesh generation method based on the infinite interpolation are applied, which play an important role in the coupling research. The preceding method is validated by comparison with the wind tunnel experimental results. For the research scope of this article (R=5×104), the flexible deformation impacts of flapping wing on aerodynamic performance are presented. The simulation results proved that the structural deformation has a significant effect on the aerodynamic forces, especially on the thrust, and the structural deformation is determined by aerodynamic and inertial forces together, b...

Aerodynamic Performance of Micro Flexible Flapping Wing by Numerical Simulation

The aerodynamic performance of flexible flapping wing is investigated through numerical simulation based on fluid-structure coupling method, which is developed on the Navier-Stokes equations and structural dynamic equations. The interface data exchange method is based on radial basis function and the moving mesh generation method is based on infinite interpolation. The flexible flapping wings we investigated are constructed of a carbon fiber skeleton and a thin extensible membrane in a bird like scale with the chord Re of 5e4. This research focused on the influence of different flexibilities with same wing structure topology. The flexibility is controlled by diameters of carbon fiber skeleton and five structures are analyzed. The simulation results proved that the structural deformation has a significant effect on the aerodynamic force, especially on the thrust. A wing with maximum rigidity has the best lift performance but the worst thrust performance, and vice versa. A wing with medium rigidity gets better performance in both lift and thrust. According to the results, it is necessary to balance the relations between structure flexibility and aerodynamic performance. Meantime, the characteristics of different structures are consistent with the variety of attack angle and flapping frequency.

Research on Applied-Information Technology with Data Distribution for Light Field Camera Array

The collection of light field is a key part of 3D image rendering and multi-view display system construction. Data exchange of light field frequently used in light field camera array requires high real-time performance and high bandwidth. This paper presents a new method of light field data exchange by applying data distribution service (DDS). Experiment results show it is feasible to apply data distribution service to the light field camera array.

Automatic Generation Method of Simulation Model for Production Planning and Simulation Systems Integration

In the paper the method of integration of production planning and simulation systems has been presented. An automatic generation method of production systems models has been implemented to integrate the Production Order Verification System (SWZ) for multi-assortment, concurrent production planning) and Enterprise Dynamics simulation system. Submitted methodology allowed the direct generation of simulation models for production systems with the use of data obtained from PPC systems, regardless of the production system structure, flow topology of the production processes and the amount of resources and production orders. Generation of simulation models is performed automatically, allowing the omission of time-and labor-consuming process of building a simulation. In the process of generation of the simulation models, methods of data mapping, transformation and exchange, between heterogeneous computer systems (PPC/DES) using neutral formats and data storing (XML) in conjunction with an intermediate neutral data model have been used. The result of transformation is the input file for simulation systems, containing information about the production system model, together with control procedures. Based on the described methodology, operation algorithms have been developed and the computer software RapidSim, that integrates PPC and DES systems has been presented.

Research on Method of CIM-Based Data Exchange for Electric Power Enterprise

A novel CIM-based approach is proposed to realize power enterprise data exchange under heterogeneous IT circumstance. CIM objects encoding specification by XML is introduced in this paper. The object is expressed by XML complex element, and the object’s properties are encoded by simple elements embedded in complex one. In order to solve some data interchange problems, a CIM/XSD schema which applies on CIM data syntax and data validation verification is established by using XML Schema Definition (XSD) technology, and an attribute group “AssociationAttributeGroup” is designed to serialize complex relationships of CIM objects. The attribute group provides syntax support for marshaling linkages of objects in certain two methods: “embedding” and “referring”. The two operators: serialization and deserialization are added to each CIM class. By this way, the CIM objects can make quickly and bidirectional alternation between memory objects and CIM/XML document. The algorithms of the two operators are designed in detail, which can implement complex object set bidirectional conversion efficiently. The case study shows that the CIM object encoding specification, the CIM/XML schema and the algorithms of serialization functions can be applied to exchange and share CIM data in electric power enterprise.

RC 구조부재에 대한 IFC와 Tekla 사이의 자료교환

The purpose of this study was to propose a method for exchange of data on RC structural members between IFC and Tekla. To achieve this purpose, a close investigation of data exchange between IFC and Tekla using import/export provided by Tekla was made and the problems of distortion or loss of data were identified. And, the explicit and reliable method for exchange of the following data was proposed; the name of building, name and elevation of story, member group, geometric shape, position and eccentricity of solid, axis and section profile, member identifiers. Then, a software, which implemented the proposed data exchange method based on Tekla Open API and IFC Engine DLL, was developed using C#. Finally, for verification of the proposed exchange method, the data on RC structural members in 2 RC sample buildings was exchanged using the software without distortion or loss of data. From the result of the data exchange, it was concluded that the proposed method can solve the problems of distortion or loss of data of RC structural members between IFC and Tekla.

Aeroelastic Modeling Using Geometrically Nonlinear Solid-Shell Elements

An aeroelastic model is developed by using multivariable solid-shell elements. Geometrical nonlinearity and the elimination of corresponding locking phenomena are considered accurately in the modeling. Unsteady aerodynamic forces are addressed by solving Euler flow dynamic equations. The computational-structural-dynamics solver is loosely coupled to the computational-fluid-dynamics solver, and the full match of the computational structural dynamics and computational fluid dynamics interfaces is achieved by three-dimensional modeling. An interpolation method using finite-element shape functions is developed to transform forces from aerodynamic grids to structural grids. The aerodynamic mesh deformation is obtained by using radial basis functions combined with the transfinite interpolation method. The aeroelastic model is validated through the study of the flutter and the limit cycle oscillation of a cropped delta wing in transonic flow. Moreover, the establishment of the aeroelastic model using multivariable solid shell elements is compared with other modeling methods. Improved numerical results show that the multivariable finite-element method is an efficient and capable tool for simulating geometrical nonlinearity, and the developed three-dimensional data-exchange method also plays a key role in the nonlinear aeroelastic modeling.

Development of Alignment-Based Parametric Data Exchange Schema for Bridge Geometry

The benefits of using building information modeling to integrate the project delivery process by exchange of project data between industry stakeholders stimulate the bridge industry to develop bridge information modeling. However, the existing data exchange methods, formats, and standards that are used by the building industry cannot be directly borrowed and used “as is” for bridge projects. Bridge projects involve specific definitions of structural geometry (e.g., roadway alignment–driven bridge layout) or definitions of bridge member geometry that are not usually used in building projects (e.g., camber data for steel plate girders). These bridge-oriented geometries cannot be described by using current building-oriented data exchange formats. Because bridge geometry depends on the geometry of the roadway carried by the bridge, it is beneficial to define a bridge as a parametric model that can be manipulated by modifying a manageably small number of independent parameters (e.g., station and skew). However, the existing data exchange standards do not support the exchange of parametric geometry. To overcome these technical limitations, this paper presents a software-neutral schema for the exchange of alignment-driven bridge-oriented parametric geometry data using eXtensible Markup Language. The application of this formalism is then illustrated via three high-priority use cases that occur during the steel bridge life cycle.

Flow-Oriented Collaborative Process Planning System

Computer Supported Cooperative Work (CSCW) has been considered as a promising approach for developing process planning systems and optimizing process plans. Process planning plays an important role in the computer integrated manufacturing environment. Process planning based on CSCW is inevitable for reducing manufacturing preparation time and costs through concurrent and collaborative engineering. In this research, two key technologies of data exchange method and data communication method are studied based on the analysis of structure and business flow for collaborative process planning. The collaborative process planning system has been developed and adopted to support collaboratively work.

Automatic recognition of hull transverse sections and rapid finite element modelling for cargo hold longitudinal structures

For rapid modelling of ship structure and sharing of product data for a computer-integrated manufacturing system in shipbuilding, this research proposes a data exchange method between two-dimensional drawings and three-dimensional finite element models. The report of the research is followed by appropriately planning the structure of the extracted data based on the Standard for the Exchange of Product Model Data. A set of rules for two-dimensional feature recognition is established, and then the method for the extraction of graphic and non-graphic design information from two-dimensional drawings of transverse sections is presented. An algorithm for rapid modelling of the longitudinal hull structure is proposed, based on data extracted from the transverse sections. This algorithm bypasses the geometric modelling stage required in traditional manual modelling, exclusively making use of the extracted information. The proposal also enriches data exchange, greatly reduces human error in modelling and consequently improves the accuracy of the finite element modelling for the shipbuilding industry.

Design Optimization of Blade's Stacking Line Based on Fluid-Structure Coupling Technique

This paper presents an approach for numerical optimization design of blade stacking line for fan/compressor blade. In the present method, the linear interpolation method and Constant-Volume Tetrahedron approach are developed to exchange data between a Navier–Stokes equation solver which is adopted to evaluate the aerodynamic performance and a commercial software which is used to attain the structural characteristics. Both of those two data exchange method have been demonstrates. A simple Genetic Algorithm as a robust design optimization tool is employed to achieve the multi-objective optimization. The proposed approach is then used to optimized a fan rotor blade with different optimization goals to verify the feasibility of the reliability. The results show that, the single objective optimization design can improve the aerodynamic performance or structural characteristics remarkably, but might not promote both of those performances. On the contrary, the multi-objective and multidisciplinary design can improve the aerodynamic performance and structural strength at the same time. So, it can attain higher aerodynamic performance while satisfying the blade strength requirements.

The Control System Method Design for the Three-Phase Inverter Parallel Using CANOpen Protocol

This paper proposed a new control system design scheme for three-phase inverter parallel. The scheme combined the distribute logic control method and the droop control method, which has been got from the talk about the traditional three-phase inverter parallel methods. The control system is based on TMS320F2812 DSP, and the interface implementation method is presented. As the data exchange method between the inverters, the communication protocol for this system based on CANopen protocol has been given and the parameters for communication map and object dictionary is also given. The method proposed in this paper has been used in the lab, and the successful use has proved that this method can meet the requirements for the processing speed, communication speed, and flexibility of three-phase inverter parallel control system.

AB0770 Rheuma-card: involvement of the patient through a secure systems access into the treat to target strategy in rheumatology.

BackgroundComputer technology and Internet access are becoming increasingly available. A recent report published by the National Institute of Statistics showed at the end-2011 that 58.7% of Italian families (35.800.000) had...

Controlling a team of unmanned underwater vehicles performing water region search tasks

Abstract The article discusses a problem of performing a mission and controlling a team of unmanned underwater vehicles which perform a task of water region search. The team of underwater vehicles has been modelled as a multi-agent system, which made it possible to use the mechanism of multi-agent systems for controlling the team of cooperating underwater vehicles, with each vehicle being treated as an individual agent. Solutions to cooperation problems in multi-agent systems were proposed, including the presentation of the system structure and the data exchange method. Issues relating to cooperation actions in the team of underwater vehicles were described and solved using the theory of games and the vector quality index. The process of negotiations between the vehicles was modelled as the multiplayer cooperative game, which secured successful realisation of the task performed by the team of vehicles with respect to time, which represents the economic aspect of the task. The optimal solution was selected based on the vector quality index, which provided opportunities for minimisation of costs having the form of energy used by the entire team, and maximisation of profits in the form of time needed for completing the water region search task. The proposed method for dividing the action space in the water region search tasks performed by the team of underwater vehicles consists in assigning to each of cooperating underwater vehicles a task the realisation of which contributes to the realisation of the globally defined task. Finally, the results of water region search tasks performed by a team of cooperating underwater vehicles are presented and discussed taking into account possible vehicle failures happening during task realisation.

基于LabSQL的数据库访问技术

本文总结并比较了用LabVIEW访问数据库的几种方法，重点介绍了LabSQL数据库访问工具包，说明了在LabVIEW环境下，利用LabSQL实现与数据库交互的方法，实现某型人才数据管理任务。将其综合利用，可实现复杂的数据库操作。 In this article, some kinds of methods that LabVIEW used to access database are summarized and compared with, and LabSQL database access kit has been introduced emphatically. It explains the method of data exchange using LabSQL in LabVIEW. It has been applied to the certain talent management system. It can also carry out complex data-base operations if integrated.

Real-Time Control and Data Exchange Method in Software CNC System Based on PC

A new real-time control method for software CNC based on PC is proposed, and the data exchange methods are given. Both external and system clock interrupt are adopted as interpolation cycle to make up software CNC on PC. The data between the front procedures, interpolation module, and background procedures, application module, is exchanged by WDM. The method is verified in experiment, and the resolves show that the speed control and the interpolation operator are right, and whole software CNC is significantly improved.

A Method of Real-Time Data Acquisition and Exchange in Adaptation to Integrated Dispatching Automation System

With the development of computer technology and power grid, integrated dispatching automation system has been gradually applied and used, for it has made considerable progress in technological advance and functional reliability. A method of real-time data acquisition and exchange that adapts to integrated dispatching automation system is proposed, which follows the principle of distributed collection and centralized use. It makes full use of dispatching data network and service bus, to achieve the integration of point multi-source data processing, data forwarding and data remote access, under the situation of normal operation or network failure.

The Application Research of ESFT-Based Security Data Exchange

Data exchange is one of the material bottlenecks in information construction. Many data exchange methods have been proposed to improve application interoperability. However, how to reliably provide numerous exchanges of data is a new challenge. In this paper, we design a new file format, aim to solve the above problem. The format ESFT not only guarantees the safety performance, but also dynamically generates ESFT label to record exchange historical information.

ITravel: A recommender system in mobile peer-to-peer environment

Recommender systems in mobile tourism have attracted considerable interest during the past decade. However, most existing recommender systems in mobile tourism fail to exploit information, evaluations or ratings provided by other tourists of similar interests. In this research, we propose to facilitate attraction recommendation task by exploring other tourists’ ratings on their visited attractions. The proposed approach employs mobile peer-to-peer communications for exchanging ratings via their mobile devices. A cost-effective travel recommender system—iTravel—thus is developed to provide tourists with on-tour attraction recommendation. We propose three data exchange methods that allow users to effectively exchange their ratings toward visited attractions. Simulated experiments are performed to evaluate the proposed data exchange methods and a user study is conducted to validate the usability of the proposed iTravel system.

A Study on Data Exchange Method in Food Packaging CAD System

A Study on Data Exchange Method in Food Packaging CAD System