通过对一简单的弹簧模型进行模拟测试，主要研究vol、密度对结果的影响和计算耗时的影响，发现以集中质量mass模拟质量效果最佳，此结论可能有一定局限性，希望有一定参考价值，若有问题，还请读者反馈，谢谢！
以下为测试K文件：
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*TITLE
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Part 1 for Mat 1 and Elem Type 1
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2 1 20.000000E+02
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*END 
Author: Taochun Yang
佐雍得尝，与众分享，收获快乐！
