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在文檔中 纜索參數振動研究 (頁 34-73)

第五章 結論與建議

5.2 建議

1. 觀察不同頻率比之時間歷時圖發現均有衰減之情形,原因是MATLAB 之尤格-庫塔法於計算時可能產生數值累積誤差,導致訊號有衰減的 現象,未來可再進一步修正此數值分析之誤差。

2. 在考慮纜索垂度之案例中,當頻率比為0.788時之振動行為與0.592和 1.709兩個共振頻率趨勢較不相同,因此,此頻率比為0.788之案例需 再進一步確認其振動行為。

3. 相較於不考慮纜索垂度之情況,考慮纜索垂度案例之共振頻率比並非 為整數比值,其原因未來可再進一步確認。

4. 本文為研究纜索在自由振動下的參數動反應,而纜索受風力作用產生 之效應如氣動力穩定性與疲勞現象等,為本文後續研究中可進一步分 析討論。

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表 3.3.1 A 橋纜索參數表

(rad/s) 2.894 2.894 2.894 2.894 2.894

ω2

(rad/s) 1.447 2.894 4.342 5.789 11.578

α1 0.04881 0.04881 0.04881 0.04881 0.04881

α 2 6.53596 6.53596 6.53596 6.53596 6.53596

α3 0.01054 0.04215 0.09484 0.16860 0.67440

max

表 4.3.1 高屏溪斜張橋 F101R 纜索參數表

F101R 纜索基本參數

mg (kN/m) 0.827 L(m) 325.5799 A(m2) 0.0105336

α1 0.05229 0.05229 0.05229 0.05229

α2 6.89913 6.89913 6.89913 6.89913

α3 0.00896 0.01080 0.01587 0.07464

max

ω 1.11298 1.07308 1.11510 1.11098

圖 3.1.1 傾斜索支承運動理論模式

m, L, EA M

K z

o x

w(x,t)

X(t)

圖 3.2.1 不考慮纜索垂度耦合振動模型

-0.1

(a)

(b)

圖 3.3.3 纜索第一階模態A1

( )

t 之時間歷時圖及頻譜圖(ω21 =0.5,不考 慮垂度):(a)時間歷時圖;(b)頻譜圖

(a)

(b)

圖 3.3.4 纜索第二階模態A2

( )

t 之時間歷時圖及頻譜圖(ω21 =0.5,不 考慮垂度):(a)時間歷時圖;(b)頻譜圖

(a)

(b)

圖 3.3.5 質量塊X

( )

t 之時間歷時圖及頻譜圖(ω21 =0.5,不考慮垂 度):(a)時間歷時圖;(b)頻譜圖

(a)

(b)

圖 3.3.6 橫向位移ω

( )

x,t 之反應(ω21 =0.5,不考慮垂度):(a)纜索中 點位移( 2

x = L);(b)纜索四分點位移(

4 x = L)

(a)

(b)

圖 3.3.7 纜索第一階模態A1

( )

t 之時間歷時圖及頻譜圖(ω21 =1.5,不考 慮垂度):(a)時間歷時圖;(b)頻譜圖

(a)

(b)

圖 3.3.8 纜索第二階模態A2

( )

t 之時間歷時圖及頻譜圖(ω21 =1.5,不考 慮垂度):(a)時間歷時圖;(b)頻譜圖

(a)

(b)

圖 3.3.9 質量塊X

( )

t 之時間歷時圖及頻譜圖(ω21 =1.5,不考慮垂度):

(a)時間歷時圖;(b)頻譜圖

(a)

(b)

圖 3.3.10 橫向位移ω

( )

x,t 之反應(ω21 =1.5,不考慮垂度):(a)纜索中 點位移( 2

x = L);(b)纜索四分點位移(

4 x = L)

(a)

(b)

圖 3.3.11 纜索第一階模態A1

( )

t 之時間歷時圖及頻譜圖(ω21 =1.0,不 考慮垂度):(a)時間歷時圖;(b)頻譜圖

(a)

(b)

圖 3.3.12 纜索第二階模態A2

( )

t 之時間歷時圖及頻譜圖(ω21 =1.0,不 考慮垂度):(a)時間歷時圖;(b)頻譜圖

(a)

(b)

圖 3.3.13 質量塊X

( )

t 之時間歷時圖及頻譜圖(ω21 =1.0,不考慮垂 度):(a)時間歷時圖;(b)頻譜圖

(a)

(b)

圖 3.3.14 橫向位移ω

( )

x,t 之反應(ω21 =1.0,不考慮垂度):(a)纜索中 點位移( 2

x = L);(b)纜索四分點位移(

4 x = L)

(a)

(b)

圖 3.3.15 纜索第一階模態A1

( )

t 之時間歷時圖及頻譜圖(ω21 =2.0,不 考慮垂度):(a)時間歷時圖;(b)頻譜圖

(a)

(b)

圖 3.3.16 纜索第二階模態A2

( )

t 之時間歷時圖及頻譜圖(ω21 =2.0,不 考慮垂度):(a)時間歷時圖;(b)頻譜圖

(a)

(b)

圖 3.3.17 質量塊X

( )

t 之時間歷時圖及頻譜圖(ω21 =2.0,不考慮垂 度):(a)時間歷時圖;(b)頻譜圖

(a)

(b)

圖 3.3.18 橫向位移ω

( )

x,t 之反應(ω21 =2.0,不考慮垂度):(a)纜索中 點位移( 2

x = L);(b)纜索四分點位移(

4 x = L)

(a)

(b)

圖 3.3.19 纜索第一階模態A1

( )

t 之時間歷時圖及頻譜圖(ω21 =4.0,不 考慮垂度):(a)時間歷時圖;(b)頻譜圖

(a)

(b)

圖 3.3.20 纜索第二階模態A2

( )

t 之時間歷時圖及頻譜圖(ω21 =4.0,不 考慮垂度):(a)時間歷時圖;(b)頻譜圖

(a)

(b)

圖 3.3.21 質量塊X

( )

t 之時間歷時圖及頻譜圖(ω21 =4.0,不考慮垂 度):(a)時間歷時圖;(b)頻譜圖

(a)

(b)

圖 3.3.22 橫向位移ω

( )

x,t 之反應(ω21 =4.0,不考慮垂度):(a)纜索中 點位移( 2

x = L);(b)纜索四分點位移(

4 x = L)

m, L, EA M

(a)

(b)

圖 4.3.2 纜索第一階模態A1

( )

t 之時間歷時圖及頻譜圖(ω21 =0.650,考 慮垂度):(a)時間歷時圖;(b)頻譜圖

(a)

(b)

圖 4.3.3 質量塊X

( )

t 之時間歷時圖及頻譜圖(ω21 =0.650,考慮垂 度):(a)時間歷時圖;(b)頻譜圖

圖 4.3.4 纜索中點處(

2

x= L)橫向位移ω

( )

x,t 反應(ω21 =0.650,考慮垂 度)

(a)

(b)

圖 4.3.5 纜索第一階模態A1

( )

t 之時間歷時圖及頻譜圖(ω21 =0.592,考 慮垂度):(a)時間歷時圖;(b)頻譜圖

(a)

(b)

圖 4.3.6 質量塊X

( )

t 之時間歷時圖及頻譜圖(ω21 =0.592,考慮垂 度):(a)時間歷時圖;(b)頻譜圖

圖 4.3.7 纜索中點處(

2

x= L)橫向位移ω

( )

x,t 反應(ω21 =0.592,考慮垂 度)

(a)

(b)

圖 4.3.8 纜索第一階模態A1

( )

t 之時間歷時圖及頻譜圖(ω21 =0.788,考 慮垂度):(a)時間歷時圖;(b)頻譜圖

(a)

(b)

圖 4.3.9 質量塊X

( )

t 之時間歷時圖及頻譜圖(ω21 =0.788,考慮垂 度):(a)時間歷時圖;(b)頻譜圖

圖 4.3.10 纜索中點處(

2

x= L)橫向位移ω

( )

x,t 反應(ω21 =0.788,考慮 垂度)

(a)

(b)

圖 4.3.11 纜索第一階模態A1

( )

t 之時間歷時圖及頻譜圖(ω21 =1.709, 考慮垂度):(a) 時間歷時圖;(b) 頻譜圖

(a)

(b)

圖 4.3.12 質量塊X

( )

t 之時間歷時圖及頻譜圖(ω21 =1.709,考慮垂 度):(a)時間歷時圖;(b)頻譜圖

圖 4.3.13 纜索中點處(

2

x = L)橫向位移ω

( )

x,t 反應(ω21 =1.709,考慮 垂度)

在文檔中 纜索參數振動研究 (頁 34-73)

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