This work developed a continuous timed Petri Net model of a gas turbine, using a first linear order approximation for every state of the Brayton Cycle. The Brayton cycle rules the functioning of a gas turbine, and it is composed by four states: Compression, Combustion, Expansion and Cooling. In every state (excepting the cooling phase) temperature and pressure are modeled as first order linear systems, therefore, every system is translated into a continuous timed Petri Net. The complete model can be used in further work in order to design supervisory controllers to ensure an efficient performance of a gas turbine. Although the model presented is extremely simplified, it will be used as a starting point to developed more complex models.

Continuous timed Petri Net model of Brayton Cycle for a gas turbine

Ramesh, Keerthanaa M.S.E.C.E, Purdue University, December 2015. Modeling and simulation of an automated parallel parking system using Hybrid Petri nets. Major Professor: Lingxi Li. In recent years, there have been a lot of technology innovations to automate the day to day processes done by every person. These days the automobile manufacturers introduce new features in their cars, in order to improve customer experience, like Adaptive cruise control, Parallel park assist, etc. The objective of this thesis is to model an automated parallel parking system and to simulate the system behavior, by taking into account the high level events which happen when a car is parallel parked. The tool used in this thesis to model and simulate the system is Hybrid Petri net (HPN), which is versatile to model the real life systems. Chapter 1 deals with a brief introduction of the related work in Hybrid Petri net modeling of real life systems, automatic parallel parking systems and how the concept for modeling the parallel parking system was developed. Chapter 2 deals with the general introduction about Discrete, Continuous and Hybrid Petri nets and their dynamics which are essential for understanding this thesis. Chapter 3 deals with the development of the model and the various stages in the model development. Errors encountered in each stage is briefly discussed and the improvements are discussed in the next stage of development. This chapter concludes with the final integrated model and operation of the model. Chapter 4 deals with the discussion of results obtained when the model is tested in MATLAB and SIMHPN (which is a Matlab embedded simulation program). The results are compared, the system behavior is observed and the purpose of the thesis is justified. In Chapter 5, a conclusion is provided to summarize the entire thesis.

Modeling and simulation of an automated parallel parking system using Hybrid Petri nets

This work developed the modeling and supervisory control for gas turbine. A CTPN (continuous timed Petri Net) model of a gas turbine, using a first linear order approximation for every state of the Brayton cycle is obtained. The Brayton cycle rules the functioning of a gas turbine, and it is composed by four states: compression, combustion, expansion and cooling. The principle of the gas turbine is developed by the Brayton cycle, a thermodynamic process which intervenes in the gas turbine components. The steady-state behavior of the gas turbine has been widely investigated in engineering area. Moreover, the dynamic behavior has been studied using non-linear models of its components, leading to complicated mathematical representations. The methodology of the current work begins with a simplification of the dynamical relations in every state (excepting the cooling phase) of the Brayton cycle. Temperature and pressure are modeled as first order linear systems, therefore, every system is translated into a CTPN. Furthermore, to guarantee a safety operation, an SC (supervisory controller) is designed to ensure the combustion chamber temperature is lower than 1,000 °C. Although the model presented is extremely simplified, it will be used as a starting point to develop more complex models.

/pdf/a-continuous-timed-petri-net-model-and-control-for-a-gas-2ll525yetn.pdf

A Continuous Timed Petri Net Model and Control for a Gas Turbine

Anjilivelil, Aja M.S.E.C.E, Purdue University, August 2015. Modeling, Simulation, and Optimization of Traffic Intersections using Petri nets. Major Professor: Lingxi Li. With the increasing number of vehicles on the road and the amount of time people spend driving their vehicles, traffic control and management has become an important part within logistics. Effective traffic control would involve traffic signal control and control over vehicle movement. Since Petri nets are versatile enough to represent traffic signals and traffic flow, it has become an important tool in urban traffic control. Many traffic systems are modeled using hybrid Petri nets. Chapter 1 briefly talks about traffic management systems and previous related work in the area of traffic control. Chapter 2 is a basic background on various Petri nets used in the study. The section also uses examples to demonstrate the working of Petri nets. Chapter 3 introduces the need for optimization in various industry. And then, it discusses different steps involved in optimizing a process. Chapter 4 discusses the existing model of two one-way intersection. In an effort to understand the model better, simulations are also carried out. Then, drawbacks of the existing model are discussed. This paves way for a new, improved, and realistic version of two one-way intersection. Various optimization steps discussed in Chapter 3 is used to optimize traffic light of the improved model. And then, a comparison between existing model and improved model is carried out. Chapter 5 expands the study of traffic models by connecting two different one-way intersection through a road (thus making it a network). Optimization and simulation of the connected-intersection model is also carried out. Chapter 6 is the summary which will provide a brief overview about each chapter.

Modeling, simulation, and optimization of traffic intersections using Petri nets

/pdf/simhpn-a-matlab-toolbox-for-hybrid-petri-nets-gcpj3u71sq.pdf

SimHPN: A MATLAB Toolbox for Hybrid Petri Nets

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SimHPN: A MATLAB Toolbox for Hybrid Petri Nets