Measurements that are useful in detecting unbalance and differentiating it from other faults are known as what type of measurements?

In vibration analysis, measurements that are useful in detecting unbalance and differentiating it from other faults are referred to as phase measurements. Phase measurements provide critical information about the relationship between the different vibration components. Specifically, they help determine the position of the unbalance in relation to the rotational position of the machinery. Since unbalance creates consistent and predictable vibration patterns, phase information can indicate whether the source of vibration is due to unbalance rather than other potential issues like misalignment or bearing faults.

In particular, phase analysis can help differentiate unbalance, which typically manifests as a sinusoidal vibration at the running speed of the machine, from other fault types that might present more complex or varying patterns. By monitoring the phase angles of the vibration signals, analysts can pinpoint the exact nature of the issue, leading to more effective and targeted remediation actions.

Other types of measurements, such as dynamic and static, while important in their own right, do not specifically address the differentiation of unbalance from other types of faults in the same effective manner that phase measurements do. Dynamic measurements reflect the response of the system to vibrations, whereas static measurements provide a baseline condition without the dynamic effects of operation. Non-synchronous measurements might not effectively correlate with the rotational disturbances caused by unbalance,