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A vertical quasi-fixed reference system is constructed using a torsion spring, and the vertical normal mode of a single-stage isolator is successively damped with respect to the quasi-fixed reference system. The experimental result shows that the vertical normal mode was damped from 3×10~(-8) m/ Hz~(1/2) down to 2×10~(-9) m/ Hz~(1/2) without reintroducing the high frequency ground vibration. This agrees well with the theoretical analyses.
A vertical quasi-fixed reference system is constructed using a torsion spring, and the vertical normal mode of a single-stage isolator is damped with respect to the quasi-fixed reference system. The experimental result shows that the vertical normal mode was damped from 3 × 10 ~ (-8) m / Hz ~ (1/2) down to 2 × 10 ~ (-9) m / Hz ~ (1/2) without reintroducing the high frequency ground vibration. This agrees well with the theoretical analyzes.