Technique Of Research Uncertainty Dynamic Measurements Of Vibration Acceleration Of Rotating Machines

Research on the Distribution of Axial Excitation of Positive Pressure Ventilators in the Aspect of Stability Safety of the Load-Bearing Frame

“…A vibration value of about 11-12 m/s 2 according to Mansoor et al in 2020 indicates a crack in the shaft on which the rotor is mounted [37]. The range of vibration of electric motors alone can be in the range of 0.4 to 0.8 m/s 2 according to a study by Kurkiewicz and Serwicki [38], from 0.05 to 0.35 m/s 2 according to Vasilevskyi et al [39], and in high-powered engines (about 100 kW) vibrations can be at the level of 9 to 22 m/s 2 according to a study by Ismagilov et al in 2020 [40]. In some applications, as in the electric ventilator tested by the authors, the working mechanism, which is the rotor of the ventilator, can cause an increase in vibration, a situation that is also seen, for example, in wood pelletizers [41], flat belt conveyor gears [42].…”

Evaluation of dynamic measurement uncertainty in the time domain in the application to high speed rotating machinery

“…3) by the nominal value of the vibration acceleration of X ¼ 2:34 m=s 2 [14,17], as a result of which we obtaiñ When calculating the relative value of the uncertainty of the dynamic measurement of vibration acceleration from formula (20) for the frequency of 6 kHz and the observation time 600 s, we obtain 4.27% (Fig. 4).…”

“…In accordance with [19,20], in a linear approximation, the mechanical oscillating system can be represented by one or a combination of the links of the first and second order, i.e., oscillatory link. In this case, the vibrations that are registered at the point of positioning of the accelerometer on the node of the electrospindle represent its response to the impact of the vector generating process.…”

“…From source literature [20,[22][23][24][25], it is known that the amplitude of forced harmonic power F 0 is 3 Â 10 À4 m. The mass of the accelerometer is m = 4 Â 10 À2 kg. The damping variable for the piezoelectric accelerometers is equal to 0.5, equivalent rigidity of the piezoelements is k = 2, and the minimum observation time T = 300 s. The proportionality factor or gain K MM of the measuring channel of the vibration acceleration is 10 5 .…”