振動

1. Origins, structure, and basic meaning

• Structure: 振動 is read as しんどう and is a noun for physical vibration or oscillation in a machine or structure.
• Basic usage: It refers to movement transmitted from machinery or slight movement measured in a bridge.

2. Common pitfalls and similar expressions

• Source and transmission
  • In 機械の振動が床まで伝わる, the machine is the source and まで marks how far the vibration reaches.
• Measured phenomenon
  • 橋の振動を測定する treats small structural movement as the measurement target, not merely sound or noise.