磁性体の衝突による衝撃荷重の非接触測定

抄録

A non-contact measurement method of the impact load due to collision of a ferromagnetic projectile with a non-magnetic target was proposed and validated by the experiment. In the measurement system, one coil connected to a stabilized power supply was set near the collision point to generate a magnetic field and another coil was set near the magnet coil to measure the electromotive force induced by the disturbance of the magnetic field due to passing a ferromagnetic projectile through the coils according to Faraday’s law of induction. The evaluated velocity of the projectile from the electromotive force was differentiated to obtain the acceleration, which was then multiplied by the mass of the projectile to analyze the impact load. When a steel bar was collided with an acrylic bar, the impact load analyzed from the electromotive force agreed with the impact load measured by strain gauges set on the acrylic bar, which validated the proposed method.