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VU VAN THE, TRAN BA TTNH Phuong phflp dl:\nh gii du&i dich chnyen du ciia ciic c6ng trinh cli'ng deo chju tii trqng dOng a:a duqc cho trong [!, 2]. Nhilm m& r¢ng khii nang stt d~ng cua cac phuong

In this work comparisons are made between lower bound obtaining in [3], stronger and lower bound by The-Sawczuk. Finally the optimal problem is considered, namely that it must be chosen fi1(t) fi2 (xk), for which a lower bound displacement is maximized.

In tuning fork micro-gyroscopes, two outer frames are connected indirectly or directly by using the linking elements. Their driving vibration should be exactly opposite to cause the opposite sensing modes in the direction perpendicular to driving one. These opposite driving vibrations are obtained by using a mechanical structure named the diamond-shaped frame. This paper reports mechanical responses of two outer frames in a proposed model of tuning fork gyroscope when an external force with different types is applied to them. The results show that the presence of a diamond-shaped frame guarantees the absolute anti-phase mode for the driving vibrations of outer frames.

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