初步设计工作应集中在关键元件上，这些关键元件的尺寸将影响其他元件的设计，例如有眼螺母和刚性支柱连接部件。
Initial design work should focus on components whose dimensions may affect the required designs for other components e. g. eye nuts and rigid strut connecting parts.
它通常是由经过充分正火或时效处理的灰铸铁或者球墨铸铁制成。它是一个坚固的刚性框架，所有其他基本部件都安装在床身上。通常在床身上有内外两组平行的导轨。
It usually is made of well-normalized or aged gray or nodular cast iron and provides a heavy, rigid frame on which all the other basic components are mounted.
而边界元法对于处理机械系统中的刚性和柔性结合部比较方便，因此，运用边界元法对机械系统零、部件及整机进行建模和解析具有非常重要的意义。
Because BEM has an advantage in dealing with a rigid or flexible joint, its application in modeling and analysis of mechanical system plays an important part.
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