Research on method for adaptive imbalance vibration control for rotor of variable-speed mscmg with active-passive magnetic bearings

Abstract

Imbalance vibration control for rotor is the main factor affecting attitude control performance for satellite using magnetically suspended control moment gyro (MSCMG). The method for adaptive imbalance vibration control for the rotor of variable-speed MSCMG with active-passive magnetic bearings is investigated in this paper. Firstly, on the basis of feedforward compensation, a rotor model for the imbalance vibration of variable-speed MSCMG with active-passive magnetic bearings is built, and the main factor affecting imbalance vibration compensation is also analyzed. Then, power amplifier parameter modifier with control switches is designed to eliminate the effects of time-varying parameters on the imbalance vibration compensation precision. The adaptive imbalance vibration control based on this modifier not only has high compensation precision, but also can control the frequency of parameter adjustment according to the compensation precision. Besides, since the passive magnetic bearing displacement stiffness of the rotor of variable-speed MSCMG with active-passive magnetic bearings cannot be obtained accurately, displacement stiffness modifier is employed. Finally, stability analysis is made on the imbalance vibration control system, and the range of rotation speed to ensure system stability is derived. Simulation results show that, imbalance vibration control method proposed in this paper can suppress the imbalance vibration of the rotor of variable-speed MSCMG with active-passive magnetic bearings effectively and has high precision.

Analysis, Modeling and Compensation of Dynamic Imbalance Error for a Magnetically Suspended Sensitive Gyroscope

“…According to Equation (14), we can obtain the coordinate of the geometric axis in angular coordinate system r(α, β) (18) Since α rg , β rg represent the titled angles of the rotor about x-and y-axis respectively, the additional velocity of titled angle which is generated by the dynamic imbalance can be calculated by taking the derivative of the above equation, (19) Figure 6 helps to illustrate the mechanics leading to the generation of this additional velocity of deflected angle. If ns Bs one considers the rotor of the MSSG rotating through 360°, at its start point, the deflected angle of geometric axis of rotor around x-axis α rg is 0.…”

“…Queiroz proposed an active feedback method for identifying the unknowing imbalance parameters of a rotating rotor with time-varying rotation velocity via a pair of active radial control forces [17]. Cui Peiling investigated the method for adaptive dynamic imbalance vibration control of the variable-speed rotor [18]. Based on the feedforward compensation, a parameter modifier of power amplifier with control switches is added to eliminate the unbalancing vibration, and the method has a high compensation precision.…”

Stable control of the high-speeding magnetically suspended rotor based on extended state observer and two-degree freedom internal model control for control moment gyros with serious moving-gimbal effects

“…The magnetically suspended control moment gyro (MSCMG) is one kind of attitude control actuator to modify the attitude of spacecraft with merits of large outputting control moment and fast response (Cui et al, 2017; Geranmehr et al, 2016; Zhang and Zhang, 2014). Generally, a MSCMG consists of one gyroscopic case to support the high-speeding rotor by magnetic bearings and one servo system of gimbal to make the rotor’s angular moment around its orthogonal axis.…”

A single neuron PID control method based on Smith predictor for active balancing control of rotor with time-delay

“…The balancing control problem is a key problem that affects the stability of rotating machinery [1]. Active balancing control can realize unbalance correction with the machine running, which is an advanced technology to solve the dynamic balancing problem.…”