文档介绍：MODAL SPACE - IN OUR OWN LITTLE WORLD
模态空间–在我们自己的小世界中               Pete Avitabile著 westrongmc译
Could you explain modal analysis for me?
Well...it will take a little bit but here's one that anyone can understand.
你能为我解释模态分析吗?
嗯…说来有点话长,但下面的解释人人都可理解。
You're not the first one to ask me to explain modal analysis in simple terms so anyone can understand it. In a nutshell, we could say that modal analysis is a process whereby we describe a structure in terms of
its natural characteristics which are the frequency, damping and mode shapes - its dynamic properties. Well that's a mouthful so let's explain what that means. Without getting too technical, I often explain modal analysis in terms of the modes of vibration of a simple plate. This explanation is usually useful for engineers who are new to vibrations and modal analysis.
请我用简单的概念来解释模态分析,以便任何人都可以理解它,你不是第一个人。简言之,模态分析是一种方法,籍此,可以根据结构的频率、阻尼和振型等固有属性-其动态特性-来描述结构。这真够拗口的,那我们来解释这是什么意思。不钻技术牛角尖,我经常用一个简单平板的振动模态来解释模态分析。对于刚接触振动及模态分析的工程师们来讲,这种解释向来有益。
Let’s consider a freely supported flat plate. Let's apply a constant force to one corner of the plate. We usually think of a force in a static sense which would cause some static deformation in the plate. But here what I would like to do is to apply a force that varies in a sinusoidal fashion. Let's consider a fixed frequency of oscillation of the constant force. We will change the rate of