地球引力模型程序代碼

模型地球內部引力圖地球模型計算的引力外地核處引力最大,外地核向內或向外均在減小，從地核核心區(qū)處逃離地球引力需要能量為W=3.822MgR,由于不均勻分布，勢能增加了0.5MgR實際引力為分層球體的引力標準線疊加的結果。如果地球模型不錯我們完全可以根據分層密度計算它的內引力圖半徑R密度12.750.994823.40.8461785.350.54481210.70.26228212.30.19431812.5R/N分層密度12.751.0052070.651.1817841.951.8354965.353.812691.65.1462040.2把密度確定以后，我們再把密度分層，先按最小密度繪制大圓圖，再把第二層密度減去第一層后繪圖，如此循環(huán)，畫到地核，再把所有值疊加起來，就是模型引力圖了。如果模型不錯，那么地球的實際引力就會和所畫圖一樣。當然還必須要用到內部引力公式AUTOcadvba模型程序代碼Sub 地球引力模型() Dim ml As Object Dim a As Variant, a1 As Variant, a2 As Variant, a3 As Variant, a4 As Variant Dim v As Variant, v1 As Variant, v2 As Variant, v3 As Variant, v4 As Variant, v5 As Variant Dim U As Variant, U1 As Variant, U2 As Variant, U3 As Variant, U4 As Variant Dim co As Variant co = 3 Dim p(0 To 20001) As Double Dim i As Integer Dim J As Variant a = 1.00520697211556: a1 = 1.18178444724396: a2 = 1.8354955470878: a3 = 3.81269015792163: a4 = 5.14620364557066 b = 0.236363636363636: b1 = 0.709090909090909: b2 = 1.94545454545455: b3 = 0.581818181818182: b4 = 7.27272727272727E-02 For i = 0 To 10000 Step 2 v = i / 1000: v1 = v * a: v2 = v * a1: v3 = v * a2: v4 = v * a3: v5 = v * a4 p(i) = i If v1 1 And v1 a Then U3 = 0 End If If v2 1 And v2 a1 Then U3 = 0 End If If v3 1 And v3 a2 Then U2 = 0 End If If v4 1 And v4 a3 Then U3 = 0 End If If v5 1 And v5 a4 Then U4 = 0 End If If v = 1 Then p(i + 1) = 750 * (1 + v * 2 - (1 - v 2 + (v 4) / 3) / (1 + (1 - v 2) 1.5) + U + U1 + U2 + U3 + U4 Else p(i + 1) = 500 * (1 + b * a -3 + b1 * a1 -3 + b2 * a2 -3 + b3 * a3 -3 + b4 * a4 -3) / v 2 End If Next i Set ml = T