Dynamic Modeling and Control of Engineering Systems

Kułakowski, Bohdan T.; Gardner, John; Shearer, J. L.

doi:10.1017/cbo9780511805417.002

Cited by 35 publications

(17 citation statements)

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“…Each component of a plant can be approximately modelled as a mono-dimensional lumped element in which balances of mass, momentum or energy are evaluated. This approach is often adopted in literature for the simulation of complex dynamical systems [35,36], especially for the modelling of hydraulic, pneumatic or electric networks: in particular, lumped elements in which a fluid network is discretized, can be classified in resistive and capacitive elements:…”

Section: Lumped Model Of Plant Components: Resistive and Capacitive Ementioning

confidence: 99%

Preliminary design and validation of a Real Time model for hardware in the loop testing of bypass valve actuation system

Pugi

Galardi

Carcasci

et al. 2015

Energy Conversion and Management

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Hardware in the loop Turbine bypass controller a b s t r a c tDuring the start-up and shut-down phases of steam power plants many components are subjected to pressure and temperature transients that have to be carefully regulated both for safety and reliability reasons. For this reason, there is a growing interest in the optimization of turbine bypass controllers and actuators which are mainly used to regulate the plant during this kind of operations. In this work, a numerically efficient model for Real Time (RT) simulation of a steam plant is presented. In particular, a modular Simulink™ library of components such as valves, turbines and heaters has been developed. In this way it is possible to easily assemble and customize models able to simulate different plants and operating scenarios. The code, which is implemented for a fixed, discrete step solver, can be easily compiled for a RT target (such as a Texas Instrument DSP) in order to be executed in Real Time on a low cost industrial hardware. The proposed model has been used for quite innovative applications such as the development of a Hardware In the Loop (HIL) test rig of turbine bypass controllers and valve positioners. Preliminary experimental activities and results of the proposed test rig developed for Velan ABV are introduced and discussed.

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Section: Lumped Model Of Plant Components: Resistive and Capacitive Ementioning

confidence: 99%

Preliminary design and validation of a Real Time model for hardware in the loop testing of bypass valve actuation system

Pugi

Galardi

Carcasci

et al. 2015

Energy Conversion and Management

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“…The general approach followed in literature [4][5][6][7], for a mono-dimensional flow, is described in terms of mass conservation, momentum and enthalpy balances based on the following equations (6), (7), (8).…”

Section: Discretization Of the Systemmentioning

confidence: 99%

“…According to the examples in literature [6]- [8] and commercial software [9], the simulated plant is discretized in lumped elements where equations (6), (7), (8) are re-written in terms of discrete mass, momentum or energy balances. In this way, the system can be modelled as an ODE (Ordinary Differential Equation) system which can be solved using Matlab-Simulink™.…”

Section: Discretization Of the Systemmentioning

confidence: 99%

A Thermo-Hydraulic Tool for Automatic Virtual Hazop Evaluation

Pugi¹,

Conti²,

Rindi³

et al. 2014

Metrology and Measurement Systems

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Development of complex lubrication systems in the Oil&Gas industry has reached high levels of competitiveness in terms of requested performances and reliability. In particular, the use of HazOp (acronym of Hazard and Operability) analysis represents a decisive factor to evaluate safety and reliability of plants. The HazOp analysis is a structured and systematic examination of a planned or existing operation in order to identify and evaluate problems that may represent risks to personnel or equipment. In particular, P&ID schemes (acronym of Piping and Instrument Diagram according to regulation in force ISO 14617) are used to evaluate the design of the plant in order to increase its safety and reliability in different operating conditions. The use of a simulation tool can drastically increase speed, efficiency and reliability of the design process. In this work, a tool, called TTH lib (acronym of Transient Thermal Hydraulic Library) for the 1-D simulation of thermal hydraulic plants is presented. The proposed tool is applied to the analysis of safety relevant components of compressor and pumping units, such as lubrication circuits. Opposed to the known commercial products, TTH lib has been customized in order to ease simulation of complex interactions with digital logic components and plant controllers including their sensors and measurement systems. In particular, the proposed tool is optimized for fixed step execution and fast prototyping of Real Time code both for testing and production purposes. TTH lib can be used as a standard SimScape-Simulink library of components optimized and specifically designed in accordance with the P&ID definitions. Finally, an automatic code generation procedure has been developed, so TTH simulation models can be directly assembled from the P&ID schemes and technical documentation including detailed informations of sensor and measurement system.

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“…Following the approach, similar to the suggested examples in literature [6][7][8] and usually adopted by commercial software, 9 the plant is discretized in lumped elements where the PDEs (1) to (3) are re-written in terms of control volume balances. Therefore, the system can be described by an ordinary differential equation (ODE) system where the main components are given as follows:…”

Section: Tth Lib Descriptionmentioning

confidence: 99%

A preliminary study of thermal hydraulic models for virtual hazard and operability analysis and model-based design of rotating machine packages

Conti

Presti²,

Pugi

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part E:

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Hazard and operability analysis is a decisive factor to evaluate safety and reliability of plants considering the propagated effects due to consecutive failures of known critical components. A good design and analysis practice increases the robustness of the considered system in different operating conditions; however, in the plant design process, the use of a model-based design approach is fundamental to increase speed, efficiency and reliability. In this work, a tool for the 1-D simulation of thermal hydraulic plants is presented and applied to the analysis of critical system for compressor and gas turbine units, e.g. the lubrication circuits. Different from known commercial products, the proposed tool is implemented to work in cooperation with PidXP TM (the GE Nuovo Pignone P&ID definition tool), and it is optimized for fixed step solvers in order to easily include the rotating machine control logics within the simulation environment (essential prerequisite for hazard and operability evaluations). All the above makes it suitable for the fast prototyping of real time code. Moreover, the proposed tool represents a general tool in the model-based approach, and it can be used as a Simulink TM library of components that have been optimized and specifically designed in order to make easier the automatic generation of simulation models from P&Id schemes and technical documentation, reducing errors associated to data transcription and operator misbehaviour. In this work, proposed approach and test bench on experimental data for validation purposes are shown.

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Dynamic Modeling and Control of Engineering Systems

Cited by 35 publications

References 0 publications

Preliminary design and validation of a Real Time model for hardware in the loop testing of bypass valve actuation system

Preliminary design and validation of a Real Time model for hardware in the loop testing of bypass valve actuation system

A Thermo-Hydraulic Tool for Automatic Virtual Hazop Evaluation

A preliminary study of thermal hydraulic models for virtual hazard and operability analysis and model-based design of rotating machine packages

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