DETERMINATION OF THE ACOUSTIC POWER LEVEL EMITTED BY A MACHINE COMPONENT BY MEASURING VIBRATION

Abstract

The article applies a methodology for determining the acoustic power of air-borne sound which is generated by the vibration of machinery components or the machine itself. The calculation of the acoustic power level is realized by measuring the vibration acceleration and integrating it to the vibration velocity of the rigid surface of the machinery or its component. The methodology is verified when determining the acoustic power level of operated spinning headstocks on a test facility. Undesirable noise emissions of spinning headstock bearings, as well as their operating condition, can be monitored by measuring kinematic parameters, measuring vibration acceleration and its subsequent integration. The vibration velocity was used to determine the A-weighted level and Z-weighted level of the acoustic power and at the same time to evaluate the operating condition of the two selected spinning units. The article also evaluates the importance of the correct choice of the measuring point of the analyzed spinning headstock on the test equipment when determining the level of acoustic power, which has a decisive influence on the uncertainty of the measurement.