This paper presents a study of voice command in industrial automation. Some tests were conducted on the voice recognition in a noisy environment. Compared to the laboratory environment, the signal was affected by the noise from different sources, such as: electrical motors, machine tools, human operators. An example with noise produced by an induction machine is presented. Finally, some simulation results of voice recognition in a noisy environment are presented.

The object of this paper is to investigate the dynamics of the closed loop of a cement mill and to introduce an approach for tunning robust PID controllers. Based on the analyze of the dynamic behavior of the cement mill, a robust PID controller is designed and then simulated. The simulation results confirm that the given approach provides high performances of the cement mill.

Programmable logic controllers (PLCs) are increasingly used in industrial automation projects. By their nature, in these applications safety is a crucial requirement. However, risk prevention adds costs to the PLC system, which means that a balance between costs and risks have to be found. A convenient compromise between these two criteria is provided by risk mitigation, but only to an acceptable risk level. By reviewing the fundamental definitions and concepts of system safety, and with the support of a simple example, the paper provides a framework for addressing these issues. Exploring the systematic design of safety-critical PLC systems helps to show how design engineers can verify that their projects will be safe.

Many control systems involving safety critical operations are presently implemented on programmable logic controllers (PLCs). Therefore, there is a strong need to validate that the considered PLC is compliant with the safety requirements. The paper presents a testing procedure that enables the validation of PLC programs, which greatly reduces the testing effort and provides a close link between overall system safety requirements and the PLC program.

This paper presents a dynamic regime analysis of the starting and function of the two-phase asynchronous motor with two non-orthogonal stator windings. Simulation results are obtained when the axis of the auxiliary winding is moved with 30 degrees in decreasing and increasing way. The answer concerning optimal choice of the two-phased motor for household applications is given by the results of the dynamic analysis.