Loading and Unloading Schedule of Automatic Storage/Retrieval System

2014 ◽  
Vol 602-605 ◽  
pp. 1336-1339
Author(s):  
Hong Wei Lv
Keyword(s):  
Feedback Control ◽  
Petri Net ◽  
Retrieval System ◽  
Control Strategies ◽  
Object Oriented ◽  
Deadlock Avoidance ◽  
Analysis Problem ◽  
Plant Model ◽  
Deadlock Analysis ◽  
Loading And Unloading

Based on object oriented timed place Petri net (OOTPN) model, the study on the loading and unloading schedule of automatic Storage/Retrieval System is given. The OOTPN model is established through dividing the model into six sub models according to the class of AS/RS elements, that is: In-Buffer model, In-Plant model, In-Elevator model, Out-Elevator model, Out-Plant model and Out-Buffer model. The six sub models. Furthermore, the deadlock analysis problem of the process is also discussed, and the maximally permissive feedback control strategies for deadlock avoidance are finally proposed.

Feedback control to delay or advance linear loss of stability in planar Poiseuille flow

1994 ◽  
Vol 447 (1930) ◽  
pp. 299-312 ◽  
Keyword(s):  
Feedback Control ◽  
Poiseuille Flow ◽  
Control Strategies ◽  
Linear Stability Theory ◽  
Flow Instabilities ◽  
Loss Of Stability ◽  
Stress Sensors ◽  
Shear Stress Sensors ◽  
Linear Loss ◽  
Adjacent Wall

By using linear stability theory, we demonstrate theoretically that the critical Reynolds number for the loss of stability of planar Poiseuille flow can be significantly increased or decreased through the use of feedback control strategies which enhance or suppress disturbance dissipating mechanisms in the flow. The controller studied here consists of closely packed, wall mounted, shear stress sensors and thermoelectric actuators. The sensors detect flow instabilities and direct the actuators to alter the fluid’s viscosity by modulating the adjacent wall temperature in such a way as to suppress or enhance flow instabilities. Results are presented for water and air flows.

Application of Combined Feedforward and Feedback Controller With Shaped Input to Benchmark Problem

2010 ◽  
Vol 132 (2) ◽  
Author(s):  
Young Joo Shin ◽  
Peter H. Meckl
Keyword(s):  
Feedback Control ◽  
Control Strategy ◽  
Control Strategies ◽  
Control Design ◽  
Single Frequency ◽  
Benchmark Problems ◽  
Control Force ◽  
Benchmark Problem ◽  
Advantages And Disadvantages ◽  
Robust Control Design

Benchmark problems have been used to evaluate the performance of a variety of robust control design methodologies by many control engineers over the past 2 decades. A benchmark is a simple but meaningful problem to highlight the advantages and disadvantages of different control strategies. This paper verifies the performance of a new control strategy, which is called combined feedforward and feedback control with shaped input (CFFS), through a benchmark problem applied to a two-mass-spring system. CFFS, which consists of feedback and feedforward controllers and shaped input, can achieve high performance with a simple controller design. This control strategy has several unique characteristics. First, the shaped input is designed to extract energy from the flexible modes, which means that a simpler feedback control design based on a rigid-body model can be used. In addition, only a single frequency must be attenuated to reduce residual vibration of both masses. Second, only the dynamics between control force and the first mass need to be considered in designing both feedback and feedforward controllers. The proposed control strategy is applied to a benchmark problem and its performance is compared with that obtained using two alternative control strategies.

scholarly journals Petri-net-based deadlock analysis of Process Algebra programs

1994 ◽  
Vol 23 (1) ◽  
pp. 55-89 ◽  
Author(s):  
P. Rondogiannis ◽  
M.H.M. Cheng
Keyword(s):  
Petri Net ◽  
Process Algebra ◽  
Deadlock Analysis

A Survey on the Object-Oriented Petri Net Modeling

2011 ◽  
Vol 121-126 ◽  
pp. 4350-4356
Author(s):  
Yan Pei Liu ◽  
Jun Hui Fu ◽  
Hong Yu Feng
Keyword(s):  
Petri Nets ◽  
Petri Net ◽  
Future Development ◽  
Mathematical Analysis ◽  
Object Oriented ◽  
Software Products ◽  
Object Oriented Technology ◽  
Pros And Cons ◽  
Typical Object ◽  
And Function

With the larger and more complex of the size and function of software products，choosing an efficient modeling technique for analyzing complicated and ever-changing system plays a vital role．Object-Oriented Petri nets for its unique characteristics which are simple and laconic modeling method and strong mathematical analysis capacity becomes a hot research．In this paper，it explain that the object-oriented technology how to combine with Petri nets．The typical Object-Oriented Petri net modeling steps and analysis methods are expounded. Up-to-date research about OOPN and its main improved models OOCPN, OOAPN and OOTPN are summarized, the pros and cons of each modeling are analyzed．The interrelated topics and the future development about OOPN are also mentioned．

scholarly journals Computer Network Simulation Modeling Based on Object Oriented Petri Net

2016 ◽  
Vol 12 (02) ◽  
pp. 25
Author(s):  
Xinhua Chen ◽  
Ya-ni Sun
Keyword(s):  
Petri Net ◽  
Simulation Modeling ◽  
Computer Network ◽  
Network Simulation ◽  
Object Oriented ◽  
Modeling Method ◽  
Model Based ◽  
Valid Method

This paper first briefly introduces the Petri net, and then studied in detail according to the selected object-oriented Petri net modeling method. This paper improve the object-oriented Petri net modeling method, and study the modeling and operation steps in details. Finally this paper build a computer network TCP/IP protocol model based on the object oriented Petri net. The model prove to be a good simulation to the computer network and the improved modeling method is also a valid method for further object oriented Petri net modeling.

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