地球引力模型程序代碼剖析

1、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。2. 96g2. 74g2. 500g2. 494gL 148g2. 84g2. 487g2. 484g0. 99gR3. 556g289g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R10.994820.8461780.5448120.2622820.194318R/N11.0052071.1817841.8354963.812695.146204密度

2、2.753.45.3510.712.312.5分層密度2.750.651.955.351.60.2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，再把所有值力就會和所畫圖一樣。還必須用至V內部引力公式g(a)二警1 2a2R22 a4 a2 二3g=3g0 1 2a-2 2(a2)3(1- a2)2 +1)2a41 - a232 + 1Ja二sinRsin為質點到球心的距離,g0為地表重力加速度AUTOcadvba模型程序代碼Sub 地球引力模型 ()Dim ml As O

3、bjectDim a As Variant, a1 As Variant, a2 As Variant, a3 As Variant, a4 As VariantDim v As Variant, v1 As Variant, v2 As Variant, v3 As Variant, v4 As Variant, v5 As VariantDim U As Variant, U1 As Variant, U2 As Variant, U3 As Variant, U4 As VariantDim co As Variantco = 3Dim p(0 To 20001) As DoubleDi

4、m i As IntegerDim J As Varianta = 1.00520697211556: a1 = 1.18178444724396: a2 = 1.8354955470878: a3 = 3.81269015792163: a4 = 5.14620364557066b = 0.236363636363636: b1 = 0.709090909090909: b2 = 1.94545454545455: b3 = 0.581818181818182: b4 = 7.27272727272727E-02For i = 0 To 10000 Step 2v = i / 1000: v

5、1 = v * a: v2 = v * a1: v3 = v * a2: v4 = v * a3: v5 = v * a4p(i) = iIf v1 1 And v1 a ThenU3 = 0End IfIf v2 1 And v2 a1 ThenU3 = 0End IfIf v3 1 And v3 a2 ThenU2 = 0End IfIf v4 1 And v4 a3 ThenU3 = 0End IfIf v5 1 And v5 a4 ThenU4 = 0End IfIf v = 1 Thenp(i + 1) = 750 * (1 + v * 2 - (1 - v 八 2 + (v 八 4) / 3) / (1 + (1 - v 八 2)八1.5) + U + U1 + U2 + U3 + U4Elsep(i + 1) = 500 * (1 + b * a 八-3 + bl * al 八-3 + b2 * a2 八-3 + b3a3 八-3 + b4 * a4 八-3) / v 八 2 End IfNext iSe