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This paper discusses the necessity and main methods of developing the three-dimensional visual and interactive system. Then the method of combining OpenGL and 3DS MAX is chosen to build the system. System structure, data transmission and interaction were presented with UML. The realization of dynamic model, viewpoint control, real-time display and vanish and other techniques are studied to ensure...
Development of service-oriented architecture has become more and more maturated. It provides a good solution for integrated design of complex system in effected. provides a better framework for simulation of complex system. This paper introduces concept, principle, essential characteristic and technique advantages of SOA, design integration of independent functions on heterogeneous platforms and reuse...
To achieve a succesful electromagnetic interference simulation and analysis among lots of electromagnetic equipment deployed in wide range, passing the time-varying spectrum simulation parameters to each simulation terminal quickly and in time is a critical factor. This paper proposes an electromagnetic propagation simulation platform, in which all the simulation terminals acquire part of the simulation...
Embedded systems become increasingly complex and distributed. Although there is necessity for thourough testing, exhaustive validiation and verification is hardly possible in industry due to time and resource restrictions. In the past the reason for this has often been that it was to time-consuming to specify, to execute, and to evaluate test cases for the first design models and the integrated embedded...
The paper describes a new methodology developed for model calibration and simulation of water distribution networks, starting from real time monitoring of pressures and flows throughout the system. In particular, the data recorded at the measurement stations are transmitted via GPRS to a server, archived in Oracle format, and used by the numerical simulator. Model calibration is based on a genetic...
Model-driven development has become the state- of-the-art approach for designing embedded real-time systems. Due to their high level of abstraction, models are easier to understand and verify, thus leading to less faulty systems. But even when combined with automatic code generation, there is still the risk of unintended behavior. This may, for example, arise from real sensor inputs which differ from...
The Ptolemy project studies modeling, simulation, and design of concurrent, real-time, embedded systems. The focus is on assembly of concurrent components. The key underlying principle in the project is the use of well-defined models of computation that govern the interaction between components. A major problem area being addressed is the use of heterogeneous mixtures of models of computation. Ptolemy...
The design of a wireless sensor network is a challenging task due to its intrinsically application-specific nature.Although a typical choice for testing such kind of networks requires devising ad-hoc testbeds, this is often impractical as it depends on expensive, and hard to maintain deployment of nodes. On the other hand, simulation is a valuable option, as long as the actual functioning conditions...
This research aims at the bus holding strategies for the simulation of mass rapid transit (MRT) transferring system in a terminal station with platform constraints for bus in the metropolitan area. We developed and evaluated the transfer system through computer simulation models for MRT with bus system that the goals of bus holding strategies in the model were: reduce bus waiting time, reduce passengers...
Scheme guidance is widely used in the gaining altitude phase and level flight phase of cruise missile. The missile aviates according to the planed procedure, but the unchanged scheme can't adapt to the large diversification which will possibly occur in flight, and will result in a long time' response. This paper brings forward a design method of integrative GNC, which combines the navigation information...
To facilitate guided weapon simulation system development, which usually is complex and involved different departments' collaboration, real-time simulation operation platform (RSOP) is intended to setup a effective and collaborative environment. Within RSOP, virtual image technology is used to help simulation model developers pack their application, database and all of the support resources and upload...
Bases on the virtual prototyping technology, a CAX integrated analysis environment in the PC platform is built. By the CAX, a simulation model of crankshaft system of internal combustion engine is built. The model is then used to analyze the kinematics and dynamics characteristics of some type crankshaft system. Through comparing the data of simulation result with that of classic literature, the virtual...
A stochastic simulation model using archived automatic vehicle location(AVL) and automatic passenger count (APC) data to simulate a fixed transit route service and test preventive bus operation control strategies against unreliability was developed. In this model, the bus operation and passenger demand were simulated based on AVL and APC data, and the decision-making process of preventive strategies...
Succinct test script with high efficiency is one of key point for automation of embedded software testing. In this paper, we integrated object technique with automated simulation testing to propose an object-based embedded software simulation test script language (OESSTSL) and gave its features, formal description and supporting mechanism for automated embedded software simulation testing, furthermore,...
The technology of industrial field-bus is developing very fast, and industrial Ethernet combined with fieldbus has being applied into industrial control system. However, there still are some obstacles in real-time and certainty performance when traditional Ethernet applied into field plant network. EPA (Ethernet for plant application, proposed by China) utilized real-time communication model for application...
Data communication is deeply studied to solve the real-time property and the stability of the data communication that is the key problem in the battle damage simulation system, following the logic process of data generating, sending, transmitting, receiving. Meanwhile, a series of optimized methods are proposed from the aspects of communication interface, communication server working model, concurrent...
The application of information technology makes it possible that transportation planning professional utilize mass detective data. The paper, according to business process reengineering theory, analyzes the effect of transportation planning operation process reengineering on transportation planning operation. The system in the paper is developed based on transportation software-VISUM, and integrates...
This paper investigates Real-Time Ethernet (RTE) protocols for industrial applications and their clock synchronization performance. In fact, if different RTE protocols coexist on the same network sharing the same infrastructure, clock synchronization capabilities can be affected. This paper introduces a simulation environment to evaluate coexistence of RTE protocols. The proposed tool is described...
The paper addresses the problem of creating a comprehensive fault injection environment, which integrates and improves various simulation and supplementary functions. This is illustrated with experimental results.
Tracking reentry vehicle with strong maneuvers on-line is a challenging task. The key is to develop suitable dynamic models and estimation methods. Two kinds of modeling methods are discussed for reentry tracking, and the unscented filter (UKF) is introduced to the nonlinear tracking system. To reduce the computational load, three simplifications of UKF are developed. Furthermore, the feasibility...
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