Journal
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
Volume 202, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2023.110711
Keywords
Torsion isolator; Circular Halbach array; Quasi-zero stiffness; High magnetic negative stiffness; Magnetic modeling
Categories
Ask authors/readers for more resources
To attenuate low-frequency torsional vibration in high payload occasions, a circular Halbach torsion negative stiffness isolator is proposed to provide high torsional magnetic negative stiffness for low-frequency isolation. The semi-analytical expressions of tangential-tangential coupling and tangential-radial coupling for tile magnets are derived to calculate the magnetic torque and the torsional stiffness of circular magnetic arrays. The proposed circular Halbach isolator has a preferable performance for low frequency torsional isolation, with higher magnetic stiffness than the circular traditional array.
Excessive torsional vibration is detrimental to the operation performance of key mechanical equipment. To attenuate low-frequency torsional vibration in high payload occasions, the negative stiffness isolator has been widely employed. However, due to the space constraints of compact rotating machinery, it is difficult to promote negative stiffness for counteracting high positive stiffness. Therefore, a circular Halbach torsion negative stiffness isolator is proposed to provide high torsional magnetic negative stiffness for low-frequency isolation. The semi-analytical expressions of tangential-tangential coupling and tangential-radial coupling for tile magnets are derived to calculate the magnetic torque and the torsional stiffness of circular magnetic arrays, and then the influences of structural parameters on magnetic negative stiffness are investigated. The simulation results show that the circular Halbach array has the much higher magnetic stiffness than the circular traditional array. The dynamic responses of the proposed torsional isolator are analyzed based on harmonic balance method. Moreover, experimental results show that the onset isolation frequencies of circular Halbach isolator and circular traditional isolator can be decreased by 32.57% and 17.90% respectively compared with the linear isolator. Therefore, it is demonstrated that the proposed circular Halbach isolator has a preferable performance for low frequency torsional isolation
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available