Order Tracking

You can perform order tracking by computing the order magnitude and phase from an even-angle signal. You also can compute the magnitude and phase of a specific order from the order waveform.

Unlike an order power spectrum, which provides information for all of the orders of a certain time block signal, the magnitude and phase provide information only for one particular order relative to time. Order magnitude and phase also can provide order information relative to speed when you perform a run-up or run-down test. Thus, order magnitude and phase can help you analyze sound or vibration signals by focusing on specific orders.

Use a spectral map or order power spectrum to identify the most significant orders in a sound or vibration signal. After identifying the most significant orders, you can extract an order waveform or its magnitude and phase to get detailed information for individual orders.

Many mechanical faults are associated with certain orders. Analyzing order magnitude and phase can help you detect mechanical faults directly. For example, a strong first order magnitude indicates imbalance of a machine in most cases. Analyzing the first order magnitude can help you identify the source of the imbalance. Moreover, the magnitude and phase of the first order can help you correct the imbalance when you add weights on the appropriate rotor positions.