How do you measure severity of vibration?

Vibration is a common phenomenon that occurs in many mechanical systems. It can be caused by various factors such as imbalanced loads, misalignments, bearing faults, and equipment malfunctions. The severity of vibration can have significant implications for the performance, reliability, and safety of these systems. This article explores different methods and techniques used to measure and assess the severity of vibration.

1. Accelerometers: Measuring Vibrations

Accelerometers are widely used sensors for measuring vibrations. These devices are designed to convert mechanical motion or acceleration into electrical signals. They are typically attached to the vibrating object and provide valuable information about its movements. Accelerometers can capture vibrations across different frequency ranges, from low-frequency vibrations to high-frequency oscillations.

When measuring vibration using accelerometers, it is important to consider the following parameters:

Amplitude: The magnitude of vibration, indicating how strong or weak the vibration is

Frequency: The rate of vibration cycles per unit of time, measured in hertz (Hz)

Phase: The relationship between the vibration signal and a reference signal, providing insights into the timing and synchronization of vibration events2. Vibration Severity Assessment

Once the vibration data is collected using accelerometers, it needs to be analyzed to determine the severity of the vibrations. There are various approaches to assess vibration severity:

ISO Standards: International organizations like the International Organization for Standardization (ISO) have established guidelines for evaluating vibration severity based on amplitude and frequency. These standards provide a framework for determining acceptable vibration levels based on the type of machinery and its intended use.

Vibration Analysis: Vibration analysts use specialized software and techniques to analyze vibration data. By examining amplitude, frequency, and phase information, analysts can identify the root cause of vibration, diagnose faults, and assess severity levels. This approach is commonly used in predictive maintenance programs to identify and address potential equipment failures before they occur.3. Mitigation and Control Strategies for Vibration

Once the severity of vibration is assessed, appropriate mitigation and control strategies can be implemented to minimize its impact. Some common strategies include:

Balancing: Balancing rotating components can reduce vibration caused by imbalanced loads.

Alignment: Proper alignment of machine components can minimize vibration resulting from misalignments.

Vibration Isolation: Using isolation mounts or pads can reduce the transmission of vibrations from one component to another.

Damping: Applying damping materials or systems can dissipate vibrational energy and reduce the severity of vibrations.

Implementing these strategies can help improve the performance, reliability, and lifespan of mechanical systems, while also ensuring a safer working environment for operators.

In conclusion, measuring and assessing the severity of vibration is crucial in maintaining the health and integrity of mechanical systems. The use of accelerometers, analysis techniques, and established standards enable engineers to accurately quantify vibration severity and take necessary measures to mitigate its effects. By understanding and effectively managing vibrations, we can optimize system performance and minimize the risk of costly breakdowns and accidents.