scholarly journals Interplay of mass imbalance and frustration in correlated band insulators

2021 ◽  
Vol 103 (4) ◽  
Author(s):  
Anwesha Chattopadhyay
Keyword(s):  
Mass Imbalance

Detection of mass imbalance in the rotor of wind turbines using Support Vector Machine

2021 ◽  
Vol 170 ◽  
pp. 49-59
Author(s):  
G.R. Hübner ◽  
H. Pinheiro ◽  
C.E. de Souza ◽  
C.M. Franchi ◽  
L.D. da Rosa ◽  
...  
Keyword(s):  
Support Vector Machine ◽  
Wind Turbines ◽  
Support Vector ◽  
Mass Imbalance

scholarly journals Mass Imbalance Compensation Control for Stabilized Platform Based on UKF Identification

2018 ◽  
Vol 198 ◽  
pp. 01005
Author(s):  
WeiMing Zhang ◽  
ZeLin Shi
Keyword(s):  
Mean Squared Error ◽  
Unscented Kalman Filter ◽  
Parameters Estimation ◽  
Feed Forward ◽  
Mass Imbalance ◽  
Feed Forward Control ◽  
Nonlinear Compensation ◽  
The Stability ◽  
Stabilized Platform ◽  
Platform System

Due to the mass imbalance about the center of rotation, the stability of stabilized platform system degrades with carrier’s disturbances. Various feed-forward control methods are provided by reaserchers to solve this problem, however these methods are not well applied because the eccentricity of stabilized platform could not be measured directly. The dynamics model of a typical 2-axis stabilized platform is given. The eccentricity vector is identified through Unscented Kalman Filter(UKF) algorithm. Imbalance torque is precisely observed so that the real-time nonlinear compensation for mass imbalance is achieved through a feed-forward loop. The simulation result indicates that the Root Mean Squared Error (RMSE) of parameters estimation is 0.024 after convergence. the LOS stabilization with carrier’s 2.5Hz vibration is 0.04 rad/s, which improves 78% compared to conventional feed-back control.

scholarly journals Mass-imbalance-induced structures of binary atomic mixtures in box potentials

2019 ◽  
Vol 100 (6) ◽  
Author(s):  
Bishal Parajuli ◽  
Daniel Pęcak ◽  
Chih-Chun Chien
Keyword(s):  
Mass Imbalance

Dynamic Analysis and Optimization on Assembly Parameters of Rod Fastening Rotor System With Manufacturing Tolerances

2019 ◽  
Author(s):  
Bingxi Zhao ◽  
Qi Yuan ◽  
Pu Li
Keyword(s):  
Contact Pressure ◽  
Timoshenko Beam ◽  
Contact Stiffness ◽  
Beam Element ◽  
Normal Contact ◽  
Tightening Force ◽  
Mass Imbalance ◽  
Rod Fastening Rotor ◽  
Bearing System ◽  
Timoshenko Beam Element

Abstract Rod fastening rotor (RFR), as a typical rotor structure of gas turbine which is different from the integral rotor, is comprised of a set of discs clamped together by a central tie rod or several tie rods on the pitch circle diameters. In process of machining, tolerances of the disc are inevitable, of which the parallelism error and mass imbalance are focused on in this paper. Firstly, the complex bending of RFR by accumulation of parallelism errors of discs is derived through the coordinate transmission. Then the static analysis of RFR is performed to obtain the additional pressure by the effect of unbalanced forces, which is related to the assembly angles and rotating speed, on contact surfaces using a linear hypothesis, based on which the distribution of contact pressure considering the original pre-tightening force is obtained. Then the Bifractal-Regular theory is adopted to acquire the micro-topography of the contact interface and derive the contact stiffness related to normal contact pressure, fractal upper length limit and regular shape of the contact interfaces. After that, the zero thickness element is introduced to obtain the equivalent stiffness matrices of the contact surface. In addition, the circumferential uniformly distributed rods are modeled as a spring element which provides additional bending stiffness for the RFR. Based on the analysis above, the dynamic model of the RFR-bearing system containing 10 discs is established using the Timoshenko beam element where the continuous part of the shaft is modeled by Timoshenko beam element considering shear effect. Finally, the multi-optimization is carried out on the vibration response by the coupled effects of both initial bending and mass imbalance of the RFR-bearing system through which the optimal assembly angles are obtained. The results show a good performance in decreasing vibration as well as bending of the RFR system.

Effects of mass imbalance and eccentricity defects on the automotive differential dynamics

2021 ◽  
Vol 43 (9) ◽  
Author(s):  
Fathi Djemal ◽  
Wassim Lafi ◽  
Dhouha Tounsi ◽  
Ali Akrout ◽  
Lassaad Walha ◽  
...  
Keyword(s):  
Mass Imbalance

scholarly journals Early Warning on Mass Imbalance and Clean-in-Place Strategy for Rotor of Rotating Packed Bed

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 44503-44510 ◽  
Author(s):  
Zhenghui Zhang ◽  
Yan Guan ◽  
Qian Zhao ◽  
Feng Wang
Keyword(s):  
Early Warning ◽  
Packed Bed ◽  
Mass Imbalance ◽  
Place Strategy ◽  
Rotating Packed Bed
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