文中指出，以往的一些研究者对数据采用线性拟合，只适用于特定的地区，特定的层位，而抛物线公式可以具有普遍的适应性。

It is pointed out that some researchers 'linear fitting of velocity data is only applied to a particular area or a particular formation while the parabola formulas have wide adaptability.

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此方法包括幅值法和谐波法，采用这两种方法进行了压实度检测试验，拟合出了压实度值的线性回归公式。

This method including amplitude and harmonic method, using the two kinds of methods for compaction test, fitting the linear regression equation for compaction degree.

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对非线性模量与应变的关系作了非线性拟合，用非线性模量来代替弹性模量，对弹性介质中的波速公式作了修正。

The nonlinear fitting is made on the relations between the nonlinear modulus and strain. The velocity formula in the elastic medium is corrected by using nonlinear modulus instead of elastic modulus.

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