frequency spectrum

The paper is devoted to the study of the relationship between the vibration accelerometer signal and the fill level of a ball mill. It was established that there is a direct correlation between the vibration level of the front support of the mill drum and the amount of material being ground in the mill. A low vibration level corresponds to a high fill level of the mill. Two methods of processing the vibration accelerometer signal to obtain a fill level signal using a moving window are proposed.

This paper presents a technique for defining the optimal parameters of a moving window when processing the signal of a vibration accelerometer installed on a ball drum mill as part of the automation system. Time series signals of the vibration acceleration have been synthesized based on the experimental data of frequency spectrums with the application of the inverse Fourier transform. The lower and upper limits for the moving window size have been defined.

The paper deals with the application of a new method of stress state analysis for the specified influence of the layered beams with masses on their dynamic characteristics. The proposed theoretical model takes into account layer deformation considering a transversal displased deformation, general deformation and strain. Numerical examples are under discussion: the frequency spectrum and damping dependence from the anisotropy of mechanical properties of layer beams. The results are used for optimal design of dynamic quencher fluctuations.

The application limits of optical and sonochemical methods to determine the sizes of cavitation bubbles and their derivatives have been analyzed. The effect of cavitation fields generated using an ultrasonic magnetostrictive oscillator and jet hydrodynamic emitter on the parameters of their acoustic signals has been examined. The bubbles size depending on emitter type and parameters has been determined using sonochemical analysis. The character of the dependence was estimated according to Minnaert formula.