| Nuclear power plant is one of the most important new energy equipment. Once the nuclear power plant was suffered by earthquake, it may lead to a serious leak problem. there are amount of related researches among nations, but these researches were treat as national technique secret, and this aspect of technology is not mature in domestic. According to this technique need designed a few kinds of hydraulic shock absorber which suit for the anti-earthquake of nuclear power plant based on the analysis and research of Seismic excitation.After analysis the Performance characteristics of common use tube type hydraulic shock absorber, discover that the common use tube type hydraulic shock absorber has a good attenuation performance while the frequency input is high. But the main Seismic excitation is low-frequency and the common use tube type hydraulic shock absorber can not be applied to the Anti-earthquake of Nuclear Power Plant's need.After carry on an improvement to the common use tube type hydraulic shock absorber, the hock absorber was designed to be a double freedom hock absorber. This double freedom shock absorber enhanced the Damping effect in high-frequency, but can not attenuate the low-frequency input still. So this kind of shock absorber can not be applied to the Anti- earthquake of Nuclear Power Plant's need, neither.After comprehensive research the restriction system of lower frequency, puts forward two kinds of projects which are counterweight shock absorber and nonlinear spring shock absorber to reduce the natural frequency.After analysis the Performance characteristics of counterweight shock absorber and nonlinear spring shock absorber, discover that compeer to the common use tube type hydraulic shock absorber the counterweight shock absorber can reduce to 1/2 of the common use tube type hydraulic shock absorber's natural frequency and nonlinear spring shock absorber can reduce to 1/4. Covered the seismic band in a high degreed. |
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