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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.
A novel long period passive vertical vibration isolator constructed by mounting reverse pendu-lums on two pairs of torsion springs is.By theoretical analysis and nmnerical calculation, it is shown 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.