Sensitivity analysis of parametric errors on the performance of a torsion quasi-zero-stiffness vibration isolator

摘要: Abstract A quasi-zero-stiffness (QZS) isolator can perform a good function of low-frequency vibration isolation, but its designed ultra-low dynamic stiffness could be notably affected by parametric errors, which usually occur in the manufacturing and assembling process. In this paper, effects design parameter errors on performance torsion QZS are studied, several useful guidelines for manufacture assembly achieved. An approximate relationship between single error jump-down frequency is obtained, then influence combination multiple investigated numerically. The results indicate that, as key parts isolator, universal wheel cam should avoid positive tolerances, while shaft connector has to keep away from negative tolerance, an disk spring stack mostly avoided much possible. Additionally, degradations caused eliminated due mutual counteraction these influences. Most importantly, isolation system still outperforms linear counterpart, even though it errors.