How do you measure vibration in aircrafts?

Answer 1

Accelerometers Accelerometers measure the vibration. For some structures, a strain gage can be mounted to measure the strain(stress) that can be converted to loads on the aircraft which will give you an idea of the vibration frequency. Vibration is not a concern. It is the loads resulting from the vibration. Also, the natural frequency of the structure is critical. The aircraft should be designed so the natural frequency of the structure is not the same frequency of the applied loads. This is most crucial in a helicopter design. Engineers will study to predict the natural frequency of the helicopter and then test engineers will mount the helicoper(or partial structures) in a test rig and shake it to measure its responce to an input excitation load. Many aicraft have Center of Gravity Accelerometers that record the G-forces on the aircraft. This data is recorded in the Flight Data Recorder for post-accident crash investigation.

Answer 2

Vibration in aircraft is typically measured using accelerometers that detect changes in acceleration caused by vibrations. These sensors are strategically placed throughout the aircraft to monitor and record vibration levels, which can then be analyzed to identify potential issues or sources of vibrations. Some advanced systems also incorporate sensors to measure frequency and amplitude of vibrations for a more detailed analysis.