Dynamic Link Library Research Articles

Second Development of Panel Furniture Based on Pro/E

The parametric design and second development flow of panel furniture are analyzed based on Pro/E and modular design method. It created manage database of panel furniture based on SQL2000 and ADO technology, it analyzed synchronous development mode of Pro/TOOLKIT, menu design and DLL dynamic link library development were talked, the parametric design system of hall cabinet, bedside cabinet and wardrobe under VC ++6.0 development environment was developed. Throng example program verification, the method is feasible; it can rapidly finish panel furniture models, and improve the designer's working efficiency.

An Interface from LabVIEW to the Knock Sensor Testing System

This paper proposes how to use a domestic data acquisition card to develop a car knock sensor testing and analysis system, which is based on the U.S. NI LabVIEW. The content of the testing section is to design a driver based on the dynamic link library, aimed at making a communication between LabVIEW and the data acquisition card. This system can realize real-time acquisition for the knock sensor output signal, and the testing interface is simple and practical.

Dynamic response analysis of wind turbines under blade pitch system fault, grid loss, and shutdown events

ABSTRACTThis study focuses on the dynamic responses of land‐based and floating wind turbines under blade pitch system fault and emergency shutdown conditions. The NREL 5 MW turbine is studied. A hydraulic pitch system is considered, and the faults under study are events with a seized blade or a blade running out of control. Emergency shutdown is defined as a fast pitch‐to‐feather maneuver of the blades. Load cases with power production and grid fault with ensuing shutdown are also analysed for comparison. The fault scenarios and the blades' fast pitching activity are simulated using HAWC2 through external Dynamic Link Libraries. On the basis of the time‐domain simulations, the response characteristics of the land‐based and the floating turbines in the four design load cases are compared. The load effects from the fault conditions are compared with the operational cases. Strong system dynamics and resonant responses, such as the tower elastic mode and the yaw resonant response, are elicited during shutdown. If the pitch system has a fault and one blade is hindered from normal pitching, the uneven load distribution of the blades leads to large structural and motion responses. For both turbines, the response maxima vary cyclically with the instantaneous azimuth when the blades start pitching to feather. For the floating wind turbine, the interaction of waves and wind also affects the results. The effect of the pitch rate during shutdown is analysed. The responses of the land‐based turbine in grid loss and shutdown conditions are proportional to the pitch rate, whereas decreased sensitivity is found in the cases with pitch system faults. For the floating turbine, the effect of the pitch rate is small, and reduced pitch and yaw motion extremes are observed as the pitch rate increases. Copyright © 2013 John Wiley & Sons, Ltd.

CRISIS2008: A Flexible Tool to Perform Probabilistic Seismic Hazard Assessment

In the frame of the Italian research project INGV‐DPC S2 (http://nuovoprogettoesse2.stru.polimi.it/), funded by the Dipartimento della Protezione Civile (DPC; National Civil Protection Department) within the agreement 2007–2009, a tool for probabilistic seismic‐hazard assessment (PSHA) was developed. The main goal of the project was to provide a flexible computational tool for PSHA; the requirements considered essential for the success of the project included: Some commonly used programs (e.g., FRISK by McGuire [1978]; SEISRISK III by Bender and Perkins [1987]) and more recent and state‐of‐the‐art tools (e.g., OpenSHA by Field et al. [2003], http://www.opensha.org;OpenQuake, http://openquake.org) for PSHA were analyzed. We decided to focus on CRISIS2007, which was already a mature and well‐known application (e.g., Kalyan Kumar and Dodagoudar, 2011; Teraphan et al. , 2011; D’Amico et al. , 2012; see also http://ecapra.org/CRISIS-2007), but also suitable for additional development and evolution because its source code is freely available on request. The computational tool resulted in an extensive redesign and renovation of the previous CRISIS2007 version. CRISIS is a computer program for PSHA, originally developed in the late 1980s using FORTRAN as programming language (Ordaz, 1991). In this format, still without a graphical user interface (GUI), it was distributed as part of SEISAN tools (Ottemoller et al. , 2011). Ten years later, a GUI was constructed, generating what was called CRISIS99 (Ordaz, 1999). In this version, all the graphic features were written in Visual Basic, but the computation engine remained a FORTRAN dynamic link library. The reason for the use of mixed‐language programming was that computations …

Monitoring Technology and Efficient Particle Searching Algorithm for SPH Model

To supervise and control the whole simulation of Smoothed Particle Hydrodynamics (SPH) model, a mixed language programming (MLP) method is particularly described that will not only take advantages of the Fortran’s strong computing power but also give full play to the Visual Basic’s (VB) flexible interface design and visualization capabilities. Then, a VBF SPH model with Model Monitoring Technology (MMT) is introduced in which FORTRAN computing subroutines are compiled into Dynamic Link Library (DLL) files and these files will be called by Visual Basic (VB) programs. During the calculation, the simulation processes can be easily monitored and even parameters can also be adjusted. Besides that, the VBF model includes an efficient Link-list algorithm which contained less searching cells. Two Droplet impact problems are both simulated by the VBF SPH model and a VB model to test and analyze the model efficiency. Simulations refer that both MLP method and improved Link-list algorithm extremely boosted up the model simulating efficiency.

Remote Control Techniques to the Digital Storage Oscilloscope by GPIB and VISA

Some techniques of controlling remotely the digital storage oscilloscope were proposed including VISA, VXIplug&play drivers, TVC and IVI-COM drivers. By means of GPIB and VISA, several application development environments could be used to develop remote control techniques to the digital storage oscilloscope. The programming language of Visual C++ was used to develop software. With the help of VISA and the dynamic link library, remote control to the digital storage oscilloscope through network was completed. All operations to the digital storage oscilloscope including parameters setup, data acquisition, waveform acquisition and storage, data processing were implemented in a remote place. The results show that the techniques of remote control are convenient and efficient and fit for experiments of scientific research and practical projects. DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2339

Study on Remote Control Techniques to the Digital Storage Oscilloscope Based on VC and GPIB

Some techniques of controlling remotely the digital storage oscilloscope are proposed including VISA, VXIplug&play drivers, TVC and IVI-COM drivers. By means of TekVISA, several application development environments can be used to develop functions of the digital storage oscilloscope. The programming language of Visual C++ is used to develop software. With the help of TekVISA and the dynamic link library, remote control to the digital storage oscilloscope through network is completed. All operations to the digital storage oscilloscope including parameters setup, data acquisition, waveform acquisition and storage, data processing are implemented in a remote place. The results show that the techniques of remote control are convenient and efficient and fit for experiments of scientific research and practical projects.

A method for controller parameter estimation based on perturbations

Simulation and prediction of eigenfrequencies and mode shapes for active flexible multibody systems is an important task in disciplines such as robotics and aerospace engineering. A challenge is to accurately include both controller effects and flexible body dynamics in a multidisciplinary system model appropriate for modal analysis. A method for performing modal analyses of such systems in a finite element environment was recently developed by the authors. On issue is, however, that for engineers working in a finite element environment, the controller properties are not always explicitly available prior to modal analyses. The authors encountered this problem when working with the design of a particular offshore windmill. The controller for the windmill was delivered in the form of a dynamic link library (dll) from a third party provider, and when performing virtual testing of the windmill design, it was of great importance to use the "real" controller in the form of the provided dll, rather than re-model it in for instance Simulink or EASY5. This paper presents a method for estimating the controller parameters of PID-type controllers when solving the closed-loop eigenvalue problem for active flexible multibody systems in a finite element environment. The method is based on applying incremental changes, perturbations, to relevant system variables while recording reactions from other system variables. In this work, the theory of the method is derived and the method is tested through several numerical examples.

SARA – An enhanced curve number-based tool for estimating direct runoff

This paper introduces the Spatial Analysis of surface Runoff in ArcGis (SARA v1.0) interface to estimate curve number and runoff volume for hydrologic evaluations. This version runs in a vector platform as with other extensions of ArcGIS, introducing changes to the original Natural Resources Conservation Services-Curve Number method, and allowing adaptation to local conditions. The programming syntax was developed in Visual Basic 6.0 as an ActiveX Dynamic Link Library (DLL) to interact with ArcMap, and it is released as Free and Open Source Software (FOSS) that can be modified or upgraded to other programming languages.

The User-defined Modeling Method of Power System Components Based on RTDS-CBuilder

This paper puts forward a method to design the user-defined component based on the user-defined modeling environment CBuilder of RTDS simulator. And also develops the user-defined component model with algorithm described by C language, visual graphics appearance, and the component function. And it generates the dynamic link library which has the same execution efficiency as that of the included model of RTDS. This paper takes the IEEE type EXST1 static excitation system as an example to build the user-defined component. The closed-loop tests on the user-defined component and the included one of RTDS are performed to examine the accuracy of the proposed method. By comparison, the test results show that the external characteristics of the user-defined component and the included model of RTDS are basically the same in the initialization process, the step process of the terminal voltage reference value and the case of the large disturbance.

Design and Implementation of Geometric Descriptions Based on XML

Object recognition and reconstruction plays an important role in the area of 3D robot vision, which has wide applications in autonomous mobile system. For communication between heterogeneous applications, generalized and universal object description file format is needed to be developed to replace proprietary file format. In this paper, first, a new object description model was designed by using XML Schema definition language. Second, based on the description design, a dynamic link library (dll) was implemented for converting data format among different systems. At the end, experimental results are demonstrated.

Study on Parametric Assembly Modeling of Standard Parts with Assembly Level of Mold Based on UG Secondary Development

With the use of Visual C++ 6.0 programming development tools as the secondary development of Unigraphics NX (UG), dynamic link library DLL plug-ins were created. This paper takes fixed pedestal which is a standard part with assembly level of mold as an example, describing the parametric assembly modeling technology and implementation method of automatic virtual assembly process. The method can improve the design efficiency greatly by changing the related parameters of the parts to regenerate model fast and complete the design as well as assemble of fixed pedestal. It is proved that this method can meet the mould design requirements, and can be expanded and used for parameterized modeling and assembling of other standard parts with assembly level of mold in the practice.

A Readily Accessible Platform for Detailed Combustion Emissions Calculations

This paper explores the modeling and simulation of combustion processes in a gas turbine combustor both with and without water injection for NO x control. The combustor can be modeled as a series and/or parallel combinations of perfectly stirred reactors (PSRs) and plug flow reactors (PFRs). Kinetics models require solution of non-linear and stiff ordinary differential equations (ODEs). The CVODE code from Lawrence Livermore National Laboratory can be used for the solution of these ODEs. Here we show that a reduced kinetics set coupled with an Excel callable version of CVODE (as a dynamic link library (dll)) can be used to predict emission trends in combustors. Student use is promoted by using Excel as the pre- and post-processor.

Research of Multi-Axes Motion Control System Based on LabVIEW Platform

According to Dynamic Link Library (DLL), the common motion card was successfully run on Labview virtual platform, which can graphically compile program. Based on Labview8.6 platform, Leadtech SMC-6480 control card and Yaskawa SJME-02AMA41 servo motor were used as the hardware to realize multi-axes motion control. The results indicated that each axis has three motion models of automatic, manual and return-to-zero, which can switch mutually at any time.

Modeling of reciprocating internal combustion engines for power generation and heat recovery

This paper presents a power generation and heat recovery model for reciprocating internal combustion engines (ICEs). The purpose of the proposed model is to provide realistic estimates of performance/efficiency maps for both electrical power output and useful thermal output for various capacities of engines for use in a preliminary CHP design/simulation process. The proposed model will serve as an alternative to constant engine efficiencies or empirical efficiency curves commonly used in the current literature for simulations of CHP systems. The engine performance/efficiency calculation algorithm has been coded to a publicly distributed FORTRAN Dynamic Link Library (DLL), and a user friendly tool has been developed using Visual Basic programming. Simulation results using the proposed model are validated against manufacturer’s technical data.

GeoSys.Chem: Estimate of reservoir fluid characteristics as first step in geochemical modeling of geothermal systems

A computer code GeoSys.Chem for the calculation of deep geothermal reservoir fluid characteristics from the measured physical–chemical parameters of separated water and condensed vapor samples obtained from drilled wells is presented. It was written as a dynamic link library (DLL) in Visual Basic in Visual Studio 2010 (VB.NET). Using this library a demonstration program GeoChem was developed in VB.NET, which accepts the input data file in the XML format.A stepwise calculation of deep reservoir fluid characteristics of 11 production wells of Los Azufres geothermal system is performed. The calculated concentration of CO2 (e.g.=1270mmole/kg in the well AZ-09) in the vapor, discharged into the atmosphere at the weir box, from the water sample indicates some problem in the analysis of carbonic species concentrations. In the absence of good quality analysis of carbonic species it is suggested to consider the CO2 in the vapor sample at the separator and the total dissolved carbonic species concentration in the water sample (i.e., without considering the liberation of CO2 in the atmospheric vapor at the weir box) for the geothermal reservoir fluid composition calculations. Similarly, it presents various diagrams developed in Excel for the thermodynamic evolution of Los Azufres geothermal reservoir.

Development and Simulation Using of Energy Saving Combustion Control System

A remotely controlled energy saving combustion control system is developed in this paper. The system includes three parts: upper computer, communication program between upper and lower computer, lower computer control program. Friendly human-machine interface is designed by Labview, which realizes the remote control of PLC; With Visual C, a standard dynamic link library is designed and debugged, by which the serial communication between PC and PLC can be realized; According to the scheme of air-fuel ratio, the control programs are achieved by PLC, which realizes energy saving combustion. The results of experiment in PLC experimental platform shows that the PC can effectively control the PLC .The scheme of air-fuel ratio is similar with the actual situation.

A simplified method for coupled analysis of floating offshore wind turbines

The coupled analysis of floating wind turbines is time consuming. This article presents a simplified approach for dynamic response analysis of floating wind turbines that are subjected to wave and wind loads. The goal of the approach presented here is to investigate a simplified method for the aerodynamic forces to minimize the computational time while maintaining acceptable accuracy. Hence, the simplified method is validated against a comprehensive aero-hydro-servo-elastic approach. A dynamic link library (DLL) called “TDHMILL” provides the aerodynamic loads as an external input to the Simo-Riflex. The coupled Simo-Riflex-TDHMILL, “SRT”, is compared with the HAWC2 code for spar-type wind turbines. The agreement between the SRT and HAWC2 codes is very good. The hydrodynamic code-to-code comparison between the Simo-Riflex and HAWC2 codes is carried out before the coupled wave-wind-induced analyses. The results show that the codes agree for the wave-only case, as well as for the wave- and wind-induced cases. The statistical characteristics of the dynamic motions and structural responses are compared for spar-type wind turbines. Two spar-type wind turbines are considered in the present article to investigate the sensitivity of the method to different designs. The code-to-code comparison between the SRT and HAWC2 codes is satisfactory for both the ShortSpar and DeepSpar configurations, at moderate and deep water depths, respectively. The simplified approach is intended and suitable for feasibility and pre-engineering studies of alternative substructures where effects from rotor dynamics are of minor importance. The results show that the simplified method is faster than the comprehensive method by a factor of 100, while its accuracy is acceptable in comparison to the sophisticated analyses.

Study on Rockmass Deterioration Model Based on the Unified Strength Theory

Strain softening model;Unified strength theory;Rockmass deterioration model;FLAC3D Abstract:Aiming at the problem that traditional elasto-plastic constitutive models have not been successful in predicting the depth and extent of brittle failed of hard rocks under high geo-stress condition, a new rockmass deterioration model(RDM) based on the unified strength theory is put forward in the basis of strain softening model and cohesion weaking and friction strengthening (CWFS)model. In the new model, the influence of intermediatemain stress to characteristic of rockmechanics is considered. Based on the method of lagrangian finite difference, a finite difference format of unified strain- softening elastoplastic model with strength parameters of c and φ is established. The constitutive unified elastoplastic model is imported into FLAC3D using a dynamic-link library file developed by VC++.Based on the new model, the traditional triaxial tests (with different confining pressure) and true triaxial tests (with intermediate principal stress ratio) are simulated in FLAC3D, and the measured data are compared with the results that are are simulated by strain softening model and CWFS model. The analytic results suggest that the rockmass deterioration model based on the twin shear unified strength theory has more strong applicability

Geometry Information Extraction from the STEP Neutral File

It is one of the key technologies for the integration of CAD/CAM/CAPP to extract the geometric model information. Based on a systematic analysis and comprehension on the expression of STEP geometry model, the map between EXPRESS and C++ was studied. The module of map has been developed as a dynamic link library, which facilitated the expansion of system. In order to ensure the coherence and availability of collected data, a module for data acquisition has also been designed. The reading and analysis for STEP neutral file has been realized so that the geometry information in the STEP-based three-dimensional model could be extracted. Application illustration, which is used for supporting the slicing process in rapid prototyping, has been also presented. The method put forward in the paper is conducive to the integration of different CAX systems.