A generalized non^tationary mathematical model of the ring-spinning process is proposed and compared with the stationary model commonly used for predicting process characteristics. Special attention is focused on defining the proper boundary conditions, which differ considerably from those of the stationary case. Numerical procedures are described in order to solve the problem, and the results of a sample case are presented.
The paper describes a theoretical and experimental research on adaptive control of the metal-cutting process. Results of experiments performed in various cutting conditions on a milling machine connected to a process computer acting as adaptive controller are reported. The behavior of the adaptive control system in stationary and transient conditions and in presence of air gaps has been tested and the results are discussed.
This paper describes an application of the finite-segment technique to the study of balloon in textile machines. The method is applicable to many textile processes and is very useful for correct designing of the related machines. Experimental results, which in general agree with the theoretical ones, are also reported.
In steelworks the demand for a higher product quality level has improved the rolling mill process by means of a proper work roll speed control system. Firstly this paper proposes a lumped-parameter hot-rolling mill model. The rolling mill examined is reversible and equipped with an independent speed control system for each work roll (two single-input single-output systems). Therefore, the same revolution speed, essential for a high-quality process, can only be ensured by equal set point values. Nevertheless, during the process, different disturbance load torques cause speed differences and, even if they are not noticeable, rolled section defects cannot be avoided. The second part of the paper shows that it is possible to design a proper H∞ controller, to change the two independent control systems into a more complex multiple-input multiple-output system that will obtain decidedly better performances. Simulation examples have shown improvements.
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