Modares Mechanical Engineering

Modares Mechanical Engineering

Performance of different robust control methods for three-axis rotary systems

Authors
Masoud SoltanRezaee 1
Majid Moghadam 2
Mohamad-Reza Ghazavi 3
1 Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
2 Dept. of Mechanical Engineering, Tarbiat Modares University,Tehran, Iran
3 faculti member TMU
Abstract
Rotating machinery is a type of mechanical systems that is widely used in industry. The shafts connection method, vibration control and stabilizing in these systems, have consistently been important. In this research, the robust control of a shaft system with torsional vibration has been considered. The system includes three elastic shafts, which are misaligned with each other. The misaligned shafts are connected through Cardan joints. Herein, the governing equations of torsional vibration for three-axis Cardan systems with nonlinear behavior have been derived. Then, according to the system uncertainties, robust control was used and three controllers with H∞ optimum method, H2/H∞ consolidated method and –synthesis robust stability method have been designed. The design was done after identifying the system parameters that are sensitive to uncertainty. The implementation results of designed controllers have been presented in the form of frequency response curves. Comparison and analysis of the results of three controllers show that H∞ and synthesis have both are performance and robust stability criteria, while H∞ method, which is needed to determine the weighting functions, is harder. In addition, the reduced order synthesis controller can guarantee the robust performance.
Keywords
H∞
Robust Performance
Structured Uncertainty
Optimization
H2
H∞ Method
Cardan Joint

Subjects

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Modares Mechanical Engineering
Volume 18, Issue 8
December 2018
Pages 101-110