Order tracking, in English, is actually an advanced technology for sampling and analyzing test signals of rotating machinery.
At present, there are basically two signal sampling methods for order analysis. One is fixed sample, and the other is synchronous sample, also known as order tracking.
Fixed sample is based on time data Δ t Δ t Δ T, that is, the vibration, noise signal and speed pulse signal are sampled at constant sampling rate at equal time intervals. The data results can be processed to obtain time domain diagram and spectrum diagram. At the same time, it can also be converted into order spectrum through FFT for basic order analysis. However, the order resolution and maximum order of such order spectrum are limited, and the high-order part is fuzzy, which is not conducive to accurate order analysis.
The order tracking is based on angular data Δ α ΔαΔα Constant and synchronous resampling, so the angle domain diagram and order spectrum can be obtained directly. At the same time, it can be preset Δ α ΔαΔα Therefore, the order resolution and the maximum measurable order can be controlled to obtain a more accurate order spectrum than fixed sampling.
Fixed sampling and order tracking technology have their own advantages and disadvantages. Generally speaking, if only simple order analysis is done, fixed sampling can be used. If the results of fixed sampling are not enough to support the analysis, order tracking can be considered. At present, companies such as LMS can provide software and hardware for fixed sampling and order tracking sampling at the same time, so you can set synchronous acquisition if necessary.