臺灣博碩士論文加值系統

振動對粉體製程存在相當大的影響。每一種粉體材料在運動時，在某一特定頻率下，其振動的特性較在其他頻率下明顯不同，此頻率即為此粉體材料的共振頻。本文將藉由三種不同的方法，分別為表徵質量法、top cap法及能量消散法以找出數個不同粉體材質的共振頻，並利用其共振頻對動態彈性性質作更進一步的探討。
實驗結果發現以表徵質量法、 top cap法及能量消散法均能得到粒子的共振頻fP，且此三種方法所得之結果差異不大。在實驗過程中發現雜訊的存在而造成三種方法結果不同。Top cap法為本文使用的三種方法中，屬於較佳的方法，原因為其可得知較多的粒子床內部性質。實驗結果顯示，400μm PE粉、1.62μm silica粉末及2.78μm的活性碳粉體振動雜訊較弱，易於分析；而335μm玻璃珠、1mm玻璃珠與2mm玻璃珠等顆粒雜訊較大，易造成較大的實驗誤差。
由10實驗結果平均，以表徵質量法所得400μm PE粉之fP=344Hz、1.62μm silica粉末之fP=353.7Hz、2.78μm的活性碳粉末之fP=225Hz、335μm玻璃珠之fP=150.6Hz、1mm玻璃珠之fP=153.9Hz與2mm玻璃珠之fP=162.3Hz；以top cap法所得400μm PE粉之fP=305.9Hz、1.62μm silica粉末之fP=370Hz、2.78μm的活性碳粉末之fP=222.3Hz、335μm玻璃珠之fP=176.6Hz、1mm玻璃珠之fP=182.1Hz與2mm玻璃珠之fP=177.6Hz。

Vibration has significant influences on powder handling processes. When particles vibrated at the resonance frequency、the vibrating characteristics are very different compared to those at other frequencies. Three different methods、the apparent mass method、the top cap method and the energy dissipation method were used to determine the resonance frequencies for different particles in this work、and the resonance frequencies were utilized to discuss other dynamic elastic properties of the particle assembly.
The experimental results show that the particle resonance frequency could be determined by the apparent mass method、the top cap method and the energy dissipation method、and the resonance frequencies obtained by three different methods were similar. The differences between the three methods were due to the noise signals. The top cap method is a better method compared to the other two methods、because this method can obtain more elastic properties of the particle bed、such as the stiffness constant and the damping constant、…etc. The results show that the powders of 400μm PE powders、1.62μm silica powders and 2.78μm active carbon powders had less vibrating noise and easier to be analyzed; while the 335μm glass beads、the 1mm glass beads and the 2mm glass beads had more vibrating noise and caused the experimental results bad.
The 10-time average resonance frequencies for the 400μm PE powders、1.62μm silica powders、2.78μm active carbon powders、335μm glass beads、1mm glass beads and 2mm glass beads were 344Hz、353.7Hz、225Hz、 150.6Hz、153.9Hz and 162.3Hz、respectively using the apparent mass method; the 10-time average resonance frequencies for the 400μm PE powders、1.62μm silica powders、2.78μm active carbon powders、335μm glass beads、1mm glass beads and 2mm glass beads were 305.9Hz、370Hz、222.3Hz、176.6Hz、182.1Hz and 177.6Hz、respectively using the top cap method.

誌謝 I
摘要 II
Abstract III
目錄 IV
圖目錄 VI
表目錄 XI
第一章 緒論 1
第二章 文獻回顧 3
2.1 粒子在振動床中的運動型態 3
2.2 偏析現象(segregation)與混合(mixing) 13
2.3 粒子床的彈性性質 15
2.4 粒子床能量消散 26
第三章 實驗儀器與方法 32
3.1 實驗儀器 32
3.2 實驗步驟 35
3.2.1 表徵質量法 (apparent mass method) 36
3.2.2TTop cap法 37
3.2.3 能量消散法 37
3.2.3.1 空白實驗 37
3.2.3.2 能量消散實驗 37
3.3 資料處理 38
3.3.1 相位差的校正 38
3.3.2 資料處理 39


第四章 實驗結果與討論 44
4.1 頻域分析 44
4.2 以top cap法探討床體內部的彈性性質 46
4.3 以表徵質量法探討床體內部的彈性性質 64
4-4 能量消散法 68
第五章 結論 71
參考文獻 75
附錄 79

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