该箱体的最佳尺寸是：长度为470毫米、宽度为350毫米、高度为590毫米。
Best size of the case is: 470 mm as length, 350 mm as width and 590 mm as height.
介绍了P LC在该箱体加工组合机床控制系统改造中的应用，给出了外部接线图和梯形图。
And it introduces application of Programming Logic Control (PLC) in machining this cabinet with aggregate machine tool. Then it gives outer wiring diagram and ladder diagram.
为有效地改善该箱体的动态特性，进行了箱体局部振动固有振型的修改，提出了箱体结构修改的初步建议。
A new method is advanced for comparing the natural frequencies by the author. Also, the structural dynamic modifications are carried out on the case.
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