本文研究目的在於應用氣壓隔震原理，設計一自行車氣壓式避震座桿。不同於一般避震座桿處在於其內部封存高壓氮氣，以氣體彈簧取代彈性係數固定之鋼線彈簧；此外座桿內設有節流孔道，當避震座桿運動時，氣體於節流孔道內流動產生氣阻，以達吸震緩衝之效果。再透過數學模型之建立及電腦模擬得到避震器性能曲線，以降低自然頻率下路面傳至座墊運動量為目標，進而決定各設計參數規格。
本文最後，藉由避震器測試實驗台以及自行車避震測試台的建構，分別將油氣混合式避震座桿以及本文設計之氣壓式避震座桿置入傳統自行車架，將實際量測結果與模擬結果互做印證及比較，以完成本文所設計氣壓式避震座桿之測試與研究。

The purpose of this research is applying the principle of pneumatic vibration isolator to design an air suspension seat post. Different from the ordinary, the air suspension seat post is sealed in high pressure nitrogen in order to replace the copper wire spring whose coefficient of elasticity is constant with the air spring. When the air suspension seat post works, gas flows in the inside narrow orifice and causes resistance to obtain the effect of absorbing the shock. Furthermore, through the setting-up of the mathematics model and the computer simulation to get the shock absorber characteristic curve, for the purpose of reducing the amount of exercise of the seat at natural frequency which is transmitted from the road surface, and then determine every design parameter specification.
At last, rely on the shock absorber tester and the bicycle suspension tester are constructed, examining the experiment and simulation result of the air suspension seat post into a bicycle frame and comparing with the hydro-pneumatic suspension seat post to complete the research.

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