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1/1/1989 Time synchronous averaging of pinion lB. BALL MILL VIBRATIONS V V I I I l I I I I [ I I I I I i I I 105 i ~Tooth no. 3 2 i-,,'., f revolution 380 msec Time(msec) ,,, I l I I I I l i I i I I I I I I i Figure 7.
Analysis of time synchronous averaging (TSA) indicates the teeth with pitch error. TSA and sideband index (measure of sidebands in spectrum) allows the first estimation of the pinion quality and could be applied for commissioning new pinions and gears, and also in a routine procedure for progressive machine condition assessment.
I have been using time synchronous averaging in vibration troubleshooting, since 1979, with various 1, 2 & 4 channel RTA’s. Readers may be interested in another application for sync time averaging: 2-pole electric motor vibration analysis, in distinguishing 2xRPM (slightly less than 120 Hz), 2x Line Frequency (~120 Hz), and Ball Spin Frequency (often very close to 2x rpm).
Vibration signals of 10secs were collected at shaft speed of 1797, 1772, 1750 and 1730 rpm, using accelerometers attached on the motor housing at 12 o’clock with magnetic bases. The TSAnalyzer performs time synchronous averaging and envelope detection
Synchronous Averaging of Time-Frequency Distribution With Application to Machine Condition Monitoring LiMin Zhu, LiMin Zhu School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P.R.China e-mail: [email protected]
Bearing vibration is random in nature (Antoni & Randall, 2002), and is thus separable from other vibration sources using time synchronous averaging (TSA) (Bechhoefer &
high vibration cement ball mill stalnieuweheide be Vibration in cement mill laurastownshiptourscoza authors edward a smith technical director, pilamec ltd abstract the vibrational ball mill has been around for close on fifty years and yet, it seems to have made only
Time-synchronous averaging is used to isolate vibration components associated with a specific shaft or gear and average out all other components. Envelope spectra are especially useful in identifying localized bearing faults that cause high-frequency impacts.
Time synchronous averaging for the extraction of periodic waveforms is a rather common processing method for rotating machinery diagnosis. By synchronizing the signal to the rotational angle of the component of interest (e.g. by using a tachometer reference signal), it is possible to perform the averaging in the angular domain, thus obtaining an angle-synchronous signal.
Vibration characteristics of an operating ball mill Jul 25, 2019 A ball mill, which is used to finely grind materials, causes high levels of vibration and sound during grinding operations. The vibration and sound of mills provide significant information about the internal