The purpose of this paper is to describe what is needed to create a complete multibody visualization system. The complete visualization process includes everything from data storage to image rendering, and what is nee...
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ISBN:
(纸本)1860584632
The purpose of this paper is to describe what is needed to create a complete multibody visualization system. The complete visualization process includes everything from data storage to image rendering, and what is needed for a meaningful user-to-data interaction. Normally the simulation output data has a large number of time steps, in the order of 103 to 10 6. In order to handle this large amount of data all possible bottlenecks need to be removed. This includes data storage, data processing, system modeling, and image rendering. An objectoriented approach is used for the multibody model, its basic simulation data structures, and for the visualization system. This gives well structured models and supports both efficient computation and visualization without additional transformations. simulation data can be classified into three classes, scalar-data, vector-data, and surface-data. This paper focuses on time-varying vector data. The huge amount of data and time steps require data compression. Vectors are compressed using an algorithm specially designed for time-varying vector data. Selective data access is required during visualization. A block based streaming technique is created to achieve fast selective data access. These visualization techniques are used in a full-scale industrial system and has proven its usefulness.
The authors have defined information models for power systems and devices based on objectoriented technology, and designed Global and Local information models. The Global information model is used for EMS/SCADA and p...
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ISBN:
(纸本)0780375254
The authors have defined information models for power systems and devices based on objectoriented technology, and designed Global and Local information models. The Global information model is used for EMS/SCADA and power systems operation in the control center, and the Local information model represents the behavior of components and devices in the power station and/or substation. Similar information models are being developed by IEC-TC57 as IEC61970 and IEC61850, and by EPRI as CCAPI and UCA2.0, aiming for standardization of open and multi-vendor systems integrated by cooperating EMS/SCADA systems, or equipment and devices. The information models are based on those of IEC and EPRI, and they are expanded for distributed processing in network environments. The authors implemented IEC61970 as the Global information model and IEC61850 as the Local information model with Java Class library. Also, the authors developed a prototype system that consists of a personal computer (PC) as control center, and 2 PCs as substations, and a network computing terminal with current and voltage sensors as another substation. The authors implemented agent applications for simple SCADA and simulation of the power systems devices (ex. Power Transformer, Circuit Breaker) to evaluate the cooperation between agent applications and the information model, and proved the usefulness of the information model. The authors examined the functional expansions for distributed environments, and clarified their ease of implementation and effectiveness.
The Integrated Development environment (IDE) comprising of I-UML, I-SIM/RT and I-CCG products developed by Kennedy Carter is discussed. The I-UML is an intelligent object-oriented modeling environment, based upon the ...
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The Integrated Development environment (IDE) comprising of I-UML, I-SIM/RT and I-CCG products developed by Kennedy Carter is discussed. The I-UML is an intelligent object-oriented modeling environment, based upon the object Management Group (OMG) standardd Unified Modeling Language (UML). It is found that the I-SIM provides host test and debug by generating code that runs on an instrumented architecture and communicated with GUI using messaging protocol. The IDE allows users to analyze the domains with the appropriate formalism and deploy UML for domain concerned with system structure and non-algorithmicc processing.
The software package Dymola, which implements the new, vendor-independent standard modelling language Modelica, exemplifies the emerging generation of object-oriented modelling and simulation tools. This paper shows h...
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The software package Dymola, which implements the new, vendor-independent standard modelling language Modelica, exemplifies the emerging generation of object-oriented modelling and simulation tools. This paper shows how, in addition to its simulation capabilities, it may be used as an embodiment design tool, to size automatically a design assembled from a library of generic parametric components. The example used is a miniature model aircraft diesel engine. To this end, the component classes contain extra algebraic equations calculating the overload factor (or its reciprocal, the safety factor) for all the different modes of failure, such as buckling or tensile yield. Thus the simulation results contain the maximum overload or minimum safety factor for each failure mode along with the critical instant and the device state at which it occurs. The Dymola "Initial Conditions Calculation" function, controlled by a simple software script, may then be used to perform automatic component sizing. Each component is minimised in mass, subject to a chosen safety factor against failure, over a given operating cycle. Whilst the example is in the realm of mechanical design, it must be emphasised that the approach is equally applicable to the electrical or mechatronic domains, indeed to any design problem requiring numerical constraint satisfaction.
The algorithm functions realized within the framework of the AENEAS project with an emphasis on the WAVE2/MATRIXx3 simulation environment used in their implementation were discussed. The algorithm computed the values ...
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The algorithm functions realized within the framework of the AENEAS project with an emphasis on the WAVE2/MATRIXx3 simulation environment used in their implementation were discussed. The algorithm computed the values for the ignition timing based on the profile of the Cylinder Pressure. The control concept used the position of the peak pressure occurence to effect feed-back control on the spark timing. The advantages of the WAVE in emulating real engine dynamics in a block-oriented programming environment were also presented.
Speed-sensorless control of induction motor drives has attracted considerable attention in recent past, with a vast amount of effort directed towards providing an accurate speed estimate in vicinity of zero speed. The...
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Speed-sensorless control of induction motor drives has attracted considerable attention in recent past, with a vast amount of effort directed towards providing an accurate speed estimate in vicinity of zero speed. The problem of speed estimation in the field weakening region has stayed to a large extent beyond the scope of interest. While some of the speed estimation algorithms completely fail in this region, the others exhibit a substantial speed estimation error, caused by de-fluxing of the machine and consequent variation in the magnetising inductance. This paper at first examines by simulation the speed estimation error that takes place in the field weakening region when a MRAS based speed estimator, of rotor flux type, is applied. Next, a possible solution to the problem of speed estimation under varying flux conditions is proposed. The speed estimator is modified in such a way that the variation in the instantaneous level of the flux during operation in the field weakening is recognised and properly adapted to at all times. Verification of the proposed scheme is provided by experimentation on an indirect feed-forward rotor flux oriented induction machine.
The mathematical model of cycloconverter-fed synchronous motor (CFSM) drive system with air-gap flux-orientedcontrol is made. On this base, a set of software is developed by using the object-oriented Programming (OOP...
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ISBN:
(纸本)780003464X
The mathematical model of cycloconverter-fed synchronous motor (CFSM) drive system with air-gap flux-orientedcontrol is made. On this base, a set of software is developed by using the object-oriented Programming (OOP) method to simulate the dynamic performance of CFSM. Three processes are simulated speed sudden reversion, load step-up change and flux-weakening operation. At the same time, the losses of damper windings are calculated. Using these results, this paper explains the influences of damper bars in dynamic process. Finally, the design rules for damper windings of CFSM system are presented.
The significance of the standard IEC 61131 to the manufacturing and process industries of the United kingdom is discussed. The standard IEC 61131 was developed primarily for programming logic controllers (PLC), and is...
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The significance of the standard IEC 61131 to the manufacturing and process industries of the United kingdom is discussed. The standard IEC 61131 was developed primarily for programming logic controllers (PLC), and is now supported by all major PLC vendors. The programming part 61131-3 is important in the context of an overall integrated and open system which can lead to a much more efficient business. With the increasing use of objectoriented technology, an approach which leads to total integration is becoming feasible.
A rotor time constant optimizer for a rotor flux oriented vector controlled drive was designed. The SIMULINK simulation tool was used to verify and test the initial design before producing a code for the drive. This r...
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A rotor time constant optimizer for a rotor flux oriented vector controlled drive was designed. The SIMULINK simulation tool was used to verify and test the initial design before producing a code for the drive. This reduced the development time because the algorithm can be tested in an environment where unwanted secondary effects can be ignored and changes can be made quickly and easily.
The proceedings contains 8 papers from the ieecolloquium on Power Electronic Systems simulation. Topics discussed include: modeling of power electronic converters used in electric vehicles;use of simulation in the de...
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The proceedings contains 8 papers from the ieecolloquium on Power Electronic Systems simulation. Topics discussed include: modeling of power electronic converters used in electric vehicles;use of simulation in the design and analysis of large variable speed drives;compact electrothermal models for power electronics;block diagram entry simulation for electric drives;self-commissioning for a rotor flux oriented vector controlled drives;circuit simulation using a finite element model;and combined power electronic circuit and control loop simulation.
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