不同砂土之阻尼比關係應用於減振箱之初步研究

Abstract

影響砂土阻尼比的因素包括砂土的緊密度、飽和度、細料含量等許多不同的因素。本研究首先利用幾個影響砂土阻尼比的因素，包括相對密度、飽和度、細料含量、頻率等，來探討該因素與阻尼比之間的關係，再利用外力敲擊試驗裝置，使其自由振動後，進而量測加速度值，而取得阻尼比。本研究利用砂土便宜且容易取得的特性，作為精密儀器的抗振阻尼材料，並利用本研究的結果，朝減振砂箱的研究方向前進。

The factors influencing damping ratio of sand in vibration reduction box are density, saturation, and fines content. The thesis is designed to study the damping ratio of vibration reduction sand box affected by the above mentioned factors. To do this, the impact loading is applied to the box and the time domain acceleration can be measured. Then one can attain damping ratio of the sand box . Based on the above results, the study could be useful to the further studies on vibration reduction sand box.