There is no literature mentioning the electromechanical behavior of micro\r\nstructures driven by traveling electrostatic forces. This article is thus the first to present the\r\ndynamics and stabilities of a micro-ring subjected to a traveling electrostatic force. The\r\ntraveling electrostatic force may be induced by sequentially actuated electrodes which are\r\narranged around the flexible micro-ring. The analysis is based on a linearized distributed\r\nmodel considering the electromechanical coupling effects between electrostatic force and\r\nstructure. The micro-ring will resonate when the traveling speeds of the electrostatic force\r\napproach some critical speeds. The critical speeds are equal to the ratio of the natural\r\nfrequencies to the wave number of the correlative natural mode of the ring. Apart from\r\nresonance, the ring may be unstable at some unstable traveling speeds. The unstable\r\nregions appear not only near the critical speeds, but also near some fractions of some\r\ncritical speeds differences. Furthermore the unstable regions expand with increasing\r\ndriving voltage. This article may lead to a new research branch on electrostatic-driven\r\nmicro devices.
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