A method is proposed to analyse and optimize the performance of nonlinear damping vibration isolator based on parallelogram linkage. Establish differential equation system, perform Taylor expansion coefficient, then obtain steady-state response system under harmonic excitation through methods such as perturbation averaging method. The displacement transfer rate curve has a high degree fitting w...

Abstract In near-fault seismic zones, the vertical acceleration experienced during a strong event can be greater than horizontal acceleration. Methods to reduce are applied in various forms and common use. However, methods acceleration, practical protection systems for these applications, remain elusive. One strategy protect structures, which has been demonstrated effective situations where exc...

In order to reduce the two main vibration frequency of variable speed helicopter, an anti-resonance isolator with double isolation is designed. First, dynamic formula dual was deduced based on traditional theory. With formula, natural frequency, antiresonant and transmissivity are obtained. Then, sensitivity performance efficiency for analyzed. The effects design parameters such as secondary sp...