Vibroacoustic study of powertrains operated in changing conditions by means of order tracking analysis

Single-number statistical parameters in the assessment of the technical condition of machines operating under variable load

“…By monitoring the amplitudes of characteristic orders one can obtain information about the technical condition of an examined facility. However, the change of amplitudes' values can be also caused by the system load variation [13]. Therefore, the values of characteristic orders should be monitored as a function of load.…”

“…Therefore, in addition to synchronizing the signals and the rotational speed, it is also necessary to determine the relationship between the amplitudes of diagnostic parameters and the load. In [13], the authors determined the relationships of orders amplitudes and the rotational speed for various load levels which significantly improved the diagnostics effectiveness, and in [6,14] the artificial intelligence methods were used for diagnostics of machines running at varying load. There is also an application of complex Bayesian inference [17] to detect the damage type for various variants of load and rotational speed [7].…”

Application of the STFT for Detection of the Rotor Unbalance of a Servo-Drive System with an Elastic Interconnection

“…Mechanical vibrations are a universal diagnostic signal, as shown in [14], where this signal was also used to detect electromagnetic damage. An example of the use of vibroacoustic to detect misalignment of a drive system consisting of a motor, a cylindrical gear, and a worm gear can be found in [15].…”

Analysis of the impact of oil viscosity on the vibroacoustic signal of a planetary gearbox operating at variable load

“…Synchronous methods allow eliminating the impact of the changes of rotational speed by transition from the frequency domain to the order domain related to the machine shaft rotation. Such methods significantly facilitate the diagnostics, however do not solve the problem of varying amplitude of the signal characteristic components caused by the load, shown in [18] [19]. Variable load affects, inter alia, the amplitudes of characteristic orders, and such change can be misinterpreted e.g.…”