第四章探讨以得体为最高标准的实用标准，确立各项参数和子参数。
Chapter Four discusses the practical criterion guided by the highest criterion appropriateness, establishing parameters and sub-parameters.
用有限元法建立了圆筒谐振子的模型，通过MATLAB软件编程，计算出合理的谐振子参数，对其频率密度特性进行了分析，并给出了振子的振型分布。
FEM Model is made and programmed in MATLAB, reasonable size is worked out, relation between frequency and density is analyzed, and the vibratory mode shape is given.
它将返回一组域对象，这些域对象是参数元素的子元素。
It returns an array of domain objects that are children of the parameter element.
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