針対平板電極系放電場における針電極の静力学特性 : 機械力学,計測,自動制御

Some kinds of singular dynamic phenomena were observed in a pin-to-plate gas discharge system. (1) One was vibration of the pin electrode perpendicular to the plate electrode observed at the transition from the dark discharge and the positive corona discharge due to the streamer corona when the axial stiffness of a support of the pin electrode was low. Similar vibration was observed in the negative corona discharge due to Trichel pulse and instability of the negative corona. Both vibrations were the forced vibration due to pulsative or fluctuating electrostatic force caused by ionic wind at corona discharging. (2) Another axial vibration was observed at spark discharge for the softly supported pin electrode. The applied voltage was transiently decreased and then relaxed after the occurrence of the spark discharge and alternative force was induced due to alternative ionic wind. Thus a large forced vibration coupled with the intermittent spark discharge took place. (3) Lateral whirling of the pin electrode was observed at corona discharging when the pin electrode was extremely fine. Whirling frequency was increased with the increase of the applied voltage. Axial repulsive force due to the ionic wind was the cause of the whirling.