Active vibration control of unbalanced flexible rotor–shaft systems parametrically excited due to base motion

Parametric instability of flexible rotor-bearing system under time-periodic base angular motions

“…As the simple rotor model was used, so their study could only give a qualitative insight into the systems's unstable behavior. Das et al [18,19] utilized the electromagnetic actuators to control the unstable responses of unbalanced flexible-shaft systems parametrically excited due to base motion. Only the pitching base motion was considered, while the other two base motions (rolling and yawing) were ignored in their studies.…”

“…Hou et al [16] focused on the nonlinear vibration phenomenon caused by aircraft hovering flight in a rub-impact rotor system supported by two general supports with cubic stiffness. Moreover, several researchers also concerned about the active vibration control of base excited rotor-bearing system utilizing the electromagnetic actuators [17][18][19].…”

“…The moving base not only causes external force excitations but also gyroscopic and stiffness excitations to the rotor-bearing system. Over the past ten years, a number of studies [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] have been carried out on the dynamic characteristics of base excited rotor systems, which differ distinctly from that of the fixed supported rotor systems.…”

Dynamic analysis of a harmonically excited on-board rotor-bearing system

“…El-Saeidy and Sticher [14] obtained the responses of a rigid rotor-bearing system subjected to rotating mass unbalance plus harmonic support excitations. Das et al [15] investigated the active vibration control of a flexible rotor system excited by mass unbalance and periodic rotational motion of the support. Among all the literature mentioned above, there are references studying support-excited rotor systems and whose few works dealt with the harmonically excited on-board rotors [12][13][14][15].…”

“…Das et al [15] investigated the active vibration control of a flexible rotor system excited by mass unbalance and periodic rotational motion of the support. Among all the literature mentioned above, there are references studying support-excited rotor systems and whose few works dealt with the harmonically excited on-board rotors [12][13][14][15]. Moreover, these references concentrated on the investigation of dynamic behavior of either simple rotors, rotors supported by elastic bearings with constant damping and stiffness coefficients or rotors excited by simple support motions.…”