A DYNAMIC ANALYSIS TOOL FOR EXTRACTING UML 2 SEQUENCE DIAGRAMS

The ‘short’ neutral section is a feature of alternating current (AC) railway overhead line electrification that is often unreliable and a source of train delays. However hardly any dynamic analysis of its behaviour has been undertaken. This paper briefly describes the work undertaken investigating the possibility of modelling the behaviour using a novel approach. The potential for thus improving the performance of short neutral sections is evaluated, with particular reference to the UK situation. The analysis fundamentally used dynamic simulation of the pantograph and overhead contact line (OCL) interface, implemented using a proprietary finite element analysis tool. The neutral section model was constructed using physical characteristics and laboratory tests data, and was included in a validated pantograph/OCL simulation model. Simulation output of the neutral section behaviour has been validated satisfactorily against real line test data. Using this method the sensitivity of the neutral section performance in relation to particular parameters of its construction was examined. A limited number of parameter adjustments were studied, seeking potential improvements. One such improvement identified involved the additional inclusion of a lever arm at the trailing end of the neutral section. A novel application of pantograph/OCL dynamic simulation to modelling neutral section behaviour has been shown to be useful in assessing the modification of neutral section parameters.

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Abstract: MAPPED: Predictive Dynamic Analysis Tool for MPI Applications

2012 SC Companion: High Performance Computing, Networking Storage and Analysis ◽

10.1109/sc.companion.2012.233 ◽

2012 ◽

Author(s):

Subodh Sharma ◽

Ganesh Gopalakrishnan ◽

Greg Bronevetsky

Keyword(s):

Dynamic Analysis ◽

Analysis Tool ◽

Mpi Applications

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Dynamic Analysis of a Floating Offshore Wind Turbine Under Extreme Environmental Conditions

Volume 7: Ocean Space Utilization; Ocean Renewable Energy ◽

10.1115/omae2012-83985 ◽

2012 ◽

Cited By ~ 2

Author(s):

Tomoaki Utsunomiya ◽

Shigeo Yoshida ◽

Hiroshi Ookubo ◽

Iku Sato ◽

Shigesuke Ishida

Keyword(s):

Dynamic Analysis ◽

Wind Turbine ◽

Environmental Conditions ◽

Aerodynamic Force ◽

Experimental Results ◽

Offshore Wind ◽

Offshore Wind Turbine ◽

Analysis Tool ◽

Simulation Code ◽

Floating Offshore Wind Turbine

This paper is concerned with the development of a Floating Offshore Wind Turbine (FOWT) utilizing spar-type floating foundation. In order to design such a structure, it is essential to evaluate the dynamic response under extreme environmental conditions. In this study, therefore, a dynamic analysis tool has been developed. The dynamic analysis tool consists of a multi-body dynamics solver (MSC.Adams), aerodynamic force evaluation library (NREL/AeroDyn), hydrodynamic force evaluation library (In-house program named SparDyn), and mooring force evaluation library (In-house program named Moorsys). In this paper, some details of the developed dynamic analysis tool are given. In order to validate the program, comparison with the experimental results, where the wind, current and wave are applied simultaneously, has been made. The comparison shows that satisfactory agreements between the simulation and the experimental results are obtained. However, when VIM (Vortex Induced Motion) occurs, the current loads and cross flow responses (sway and roll) are underestimated by the simulation since the simulation code does not account for the effect of VIM.

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Investigation of Data Dependencies by Dynamic Analysis of Sapfor

Russian Digital Libraries Journal ◽

10.26907/1562-5419-2020-23-3-473-493 ◽

2020 ◽

Vol 23 (3) ◽

pp. 473-493

Author(s):

Nikita Andreevich Kataev ◽

Alexander Andreevich Smirnov ◽

Andrey Dmitrievich Zhukov

Keyword(s):

Dynamic Analysis ◽

Programming Languages ◽

Static Analysis ◽

Automatic Parallelization ◽

Parallel Execution ◽

Control Flow ◽

Analysis Tool ◽

Data Dependencies ◽

Program Parallelization ◽

Memory Accesses

The use of pointers and indirect memory accesses in the program, as well as the complex control flow are some of the main weaknesses of the static analysis of programs. The program properties investigated by this analysis are too conservative to accurately describe program behavior and hence they prevent parallel execution of the program. The application of dynamic analysis allows us to expand the capabilities of semi-automatic parallelization. In the SAPFOR system (System FOR Automated Parallelization), a dynamic analysis tool has been implemented, based on on the instrumentation of the LLVM representation of an analyzed program, which allows the system to explore programs in both C and Fortran programming languages. The capabilities of the static analysis implemented in SAPFOR are used to reduce the overhead program execution, while maintaining the completeness of the analysis. The use of static analysis allows to reduce the number of analyzed memory accesses and to ignore scalar variables, which can be explored in a static way. The developed tool was tested on performance tests from the NAS Parallel Benchmarks package for C and Fortran languages. The implementation of dynamic analysis, in addition to traditional types of data dependencies (flow, anit, output), allows us to determine privitizable variables and a possibility of pipeline execution of loops. Together with the capabilities of DVM and OpenMP these greatly facilitates program parallelization and simplify insertion of the appropriate compiler directives.

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A pseudo dynamic analysis tool for thermal certification of dwellings

Fuel and Energy Abstracts ◽

10.1016/s0140-6701(02)85458-3 ◽

2002 ◽

Vol 43 (2) ◽

pp. 146

Keyword(s):

Dynamic Analysis ◽

Analysis Tool

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Dynamic Modeling of an Independent Wheelset Bogie with MapleSim

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1037.71 ◽

2014 ◽

Vol 1037 ◽

pp. 71-74

Author(s):

Tao Hua ◽

Zheng Gang Lu

Keyword(s):

Dynamic Analysis ◽

Dynamic Characteristic ◽

Dynamic Modeling ◽

Analysis Tool ◽

Rail Vehicles ◽

Straight Line ◽

Left And Right ◽

Lateral Displacements

In order to help researchers better understand the dynamic characteristic of independent wheelset rail vehicles, this article presents a new modeling way to establish an independent wheelset bogie with a white-box dynamic analysis tool-MapleSim. In this article, an independent wheelset model is made firstly. Than based on this wheelset model, an independent wheelset bogie is made. After the modeling, the necessary validation with Simpack is done. The straight line dynamic validation includes the creepage of left and right wheels, the lateral displacements of bogie and both wheelsets’ yaw and lateral displacements. The results are similar to the model with the same parameters in Simpack which reveals that the bogie model in this article is correct and feasible.

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