Volume 11

The complexity of enterprise systems, the increasing needs for advanced collaboration among various systems within one institution or among many collaborating parties, and the velocity of organizational, policy, structural and market changes, presents nowadays challenges for the research community to develop more flexible and reliable technologies. Many real world manufacturing systems are too complex to be modeled analytically. Simulation based optimization is a very actual topic in discrete-event systems simulation.

The paper presents a comparison of several methods for production line bottleneck analysis using discrete event simulation approach and the simulation software WITNESS. An experimental environment has been created for processing and comparison of results obtained from the WITNESS simulation experiments. The advantages and constraints of the cited methods are discussed.

The paper deals with an electronic throttle control problem. The proposed method applies a discrete PI controller with parameters scheduling and feedforward controller working together.

The paper deals with the problem of fault-tolerant embedded systems. To ensure the system’s fault tolerance, we use the multiple watchdog system that assigns a dedicated hardware watchdog timer to each of the concurrent processes. For sake of simplicity, effectiveness and adaptability, the watchdogs are implemented in the programmable hardware devices. This approach has several advantages and provides a method for implementing the reliable fault-tolerant embedded systems.

In this paper we present a simple method for design of the controller with two degrees of freedom using the generalized method of the required transfer function. Using this method, only one controller is designed.

The aritcle deals with the control structure design for a permanent magnet synchronous motor (PMSM) traction drive. Design and implementation of the speed servosystem under the field weakening conditions. The results of the design were verified on hybrid simulation model in Matlab- Simulink environment.

Article deals with elimination of transmission problems using Fieldbus Tester for physical layer of PROFIBUS DP. For experiment was used Softing’s diagnostic tool PB-T3 and Profibus network with 16 stations. The special device, conection and method were prepared for simulation of transmission troubles. Results and experiences of this diagnostic method can be used for training of diagnostic experts.

This article describes principal advantages of Distributed Control System and its potential application in the control of a school model of flexible production line. Utilizing the features provided by this method of system control (advanced control and monitoring features, user-friendly graphical interfaces, alarm events management, historical databases, etc.) enables to create a fully automated technological production process that will be used in teaching process.

In this paper controller design method for SISO systems with performance specification in term of phase margin is presented. Mentioned method is a modification of Neimark D-partition method which ensure desired phase margin of open loop system instead of stability degree. The developed frequency domain design technique is graphical, interactive and insightful. Theoretical results are demonstrated on examples.