地球引力模型程序代码

1、模型地球内部引力图地球模型计算的引力外地核处引力最大，外地核向内或向外均在减小，从地核核心区处逃离地球引力需要能量为W=3.822MgR,由于不均匀分布，势能增加了 0.5MgR 实际引力为分层球体的引力标准线叠加的结果。4. 472g2. 96g2. 74g2. 500g2. 494gL 148g如果地球模型不错我们完全可以根据分层密度计算它的内 引力图半径 R1密度2.750.994823.40.8461785.350.54481210.70.26228212.30.19431812.5R/N分层密度12.751.0052070.651.1817841.951.8354965.353.81

2、2691.65.1462040.2把密度确定以后，我们再把密度分层，先按最小密度绘制大圆图，再把第二层密度减去第一层后绘图，如此循环，画到地核，再把所有值叠加起来，就是模型引力图了。如果模型不错，那么地球的实际引力就会和所画图一样。当然还必须要用到内部引力公g(a)3MG2R22aa2a43g0 1 2a1a2(1 a2)2(1a2)? 1a sin , Rsin为质点到球心的距离,g。为地表重力加速度AUTOcadvba模型程序代码Sub地球引力模型()Dim ml As ObjectDim a As Variant, a1 As Variant, a2 As Variant, a3 As

3、Variant, a4 AsVaria ntDim v As Variant, v1 As Variant, v2 As Variant, v3 As Variant, v4 AsVaria nt, v5 As Varia ntDim U As Variant, U1 As Variant, U2 As Variant, U3 As Variant, U4 AsVaria ntDim co As Varia ntco = 3Dim p(0 To 20001) As DoubleDim i As In tegerDim J As Varia ntb =0.236363636363636: b1

4、=0.709090909090909: b2 =1.94545454545455: b3 b4 = 7.27272727272727E-02 For i = 0 To 10000 Step 2v = i / 1000: v1 = 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 + b1 * a1 八-3 + b2 * a2 八-3 + b3 * a3八-3 + b4 * a4 八-3) / v 八 2End IfNext iSet ml = Th