2×6MV串列加速器钢桶的机械设计与应力校核

Mechanical Design and Stress Verification of the Tank of 2×6MV Tandem Accelerator

钢桶是串列加速器主体的核心部件,此前国内大多数学者都是根据经验或参照外国同类产品进行串列加速器钢桶的机械设计,因而对其的研究缺乏完善的理论依据。针对此问题,该文以2×6MV串列加速器为基础开展理论设计研究。在保障其结构强度与气密性的前提下,通过控制外壁厚度来实现桶身质量减小的目的。首先基于无矩理论,钢桶选取标准椭圆形封头,外壁最小名义厚度为9 mm;然后根据卧式容器近似分析与计算方法,确定出鞍座底板中心至封头切线的最佳距离为0.64 m;最后建立钢桶有限元模型,开展应力与变形分析。该研究通过对封头形状、外壁厚度、鞍座位置的设计与选择,得出了使钢桶质量最小的机械参数,为2×6MV串列加速器钢桶的实际加工和其它有相似结构的串列加速器的机械设计提供了理论依据。

Tank is one of the most important parts of tandem accelerator,working as the paltform to carry other components in the main body of accelerator.Previously,most mechanical designs for tandem accelerator tank were based on experience or reference to similar foreign products,without a sound theoretical basis.Regarding this,theoretical design research on 2×6MV tandem accelerator is conducted in this article.The purpose of mechanical design for the 2×6MV tandem accelerator is to reduce the tank's mass by controlling the wall thickness while ensuring its structural strength and airtightness.According to the membrane theory,the tank has the standard elliptical head,and the minimum nominal thickness of tank's wall thickness is 9 mm;Based on the approximate analysis and calculation method proposed by L.P.Zick for horizontal vessels,distance from the center of the saddle base plate to the tangent line of the head is 0.64 m.The finite element model of tank that stand constraints and external loads is established to conduct stress and displacement analysis.Through the research,the shape of the head,thickness of the outer wall,and position of the saddle are designed and selected,and mechanical parameters that minimize the mass of tank are obtained.It provides a reference for manufacture of the 2×6MV tandem accelerator's tank and mechanical design of other tandem accelerators with the similar structures.