PERFORMANCE OF ULTRA-LOW FREQUENCY PASSIVE VERTICAL VIBRATION ISOLATION SYSTEM WITH REVERSE PENDULUM

摘要

A novel long period passive vertical vibration isolator constructed by mounting reverse pendu-lums on two pairs of torsion springs is presented.By theoretical analysis and nmnerical calculation,it isshown that the isolator can achieve much longer resonant period due to gravitational positive feedback and issmaller in size than the current torsion spring isolators with the same geometric parameters.