Acceleration Pickup Frequently Asked Questions

Human vibration perception varies significantly depending on the frequency of the vibration.

When displaying 1 G (9.8 m/s ²) with displacement X,

（mm）

At 100 Hz, it is 0.025 mm, while at 10 Hz, it changes significantly to 2.5 mm.

There is a vibration level meter that expresses ground vibrations and floor vibrations as felt by humans. It presents the magnification based on 10^-5 m/s ² in dB (logarithmic scale).

 

In 1 G

will become.

Additionally, the vibrations felt by humans range from about 1 Hz to 100 Hz, and the perception of their strength changes with frequency. This is referred to as vibration sensation characteristics, with the most sensitivity occurring around 4 to 8 Hz, and the perception dulls as the frequency deviates from this range. (Please refer to the VR-6100 catalog.)

Generally, the vibration values corrected for this vibration sensation characteristic are displayed as vibration levels in dB.

Additionally, there are seismic intensities ranging from 0 to VII. (Although magnitude is now used, the relationship between acceleration and intensity is shown in the table below.)

There is a relationship of 1G = 980 cm/s ² = 980 gal (1 gal = 1 cm/s ²).

 

Since the purpose is to analyze the impact of floor vibrations from installed machinery, frequency is an important factor, and frequency analysis is being conducted.

as a unit of speed

1 kine = 1 cm/sec

There is.