What is the purpose of using a tachometer in vibration analysis?

The purpose of using a tachometer in vibration analysis is to measure the rotational speed of a machine, which is essential for frequency analysis. Understanding the speed at which a machinery component is operating allows analysts to correlate vibration data with the operational conditions of the machine. This correlation is critical because many vibration issues are related to specific rotational frequencies; for example, unbalance and misalignment typically manifest at multiples of the rotational speed. By knowing the exact speed, the tachometer helps in identifying the root causes of vibration issues and facilitates the diagnosis of mechanical problems.

The tachometer's role is fundamental in ensuring that vibration analysis is conducted accurately, as it provides the necessary rotational information that is crucial for effective monitoring and troubleshooting of rotating machinery.