|
ZENG Pan
LEI Liping
ZHAO Ruihai
LI Ying
Key Laboratory of Advance
Manufacturing Prototype Technology,
Ministry of Education, Tsinghua University Beijing 100084, China
CHEN Yuanbo
TANG Xiao
Institute of High Energy Physics,
Chinese Academy of Sciences, Beijing 100049, China |
|
|
NUMERICAL ANALYSES OF DESIGN AND
ASSEMBLY FOR MAIN COMPONENTS OF BESIII*
Abstract:
The design and manufacture of the main drift chamber(MDC) and the electro-magnetic calorimeter are most important issues in Beijing electron-positron collider upgraded projects. The whole mass of electro-magnetic calorimeter (EMC) in BESIII is 40 t, thus high stiffness, strength and dynamical properties are required for the design of entire structural of electro-magnetic calorimeter. Based on numerical technique, the strength and the dynamical properties of EMC are analyzed, which provide theoretical reference for the design of entire structural of EMC. The MDC is composed of the elements with 28 680 pre-stressed high-sensitive wires and during the assembly the wires are stringed layer by layer. The stretching forces of the wires vary continuously and couple with each other in the whole process. The modeling technique with high precision (especially “element birth and death”) is carefully used to study the stress state during the process of assembly. So the variations of the stretching force of the wire are investigated, and several design schemes are evaluated and optimized. The research results have been adopted in the Beijing electron-positron collider’s new project directly.
Key words:
Main drift chamber (MDC) Electro-magnetic calorimeter (EMC) Finite element method (FEM) Pre-stress
|