Papers by Author: Jun Wang

Abstract: In order to satisfy the requirement of optical system positioning in SG-III facility, the target area support system should provide a stable platform for optical elements. The target area support system includes a rectangular target area building, target chamber support structures and a switchyard steel frame. The vibrational stability of the target area support system will be achieved through a combination of structure design, large modal damping material, and friction dampers. Finite element analysis has been used to evaluate the target area support system. The rotation drifts of the transport mirrors, the translation drifts of the focal lenses, and the translation drift of the target are obtained. The orientation errors of each beam in target area system are less than 12.9μm based on the relation between the beam orientation error and optics elements drifts. And the safety factors are 1.44 to 2.3. The design of the target area support system has satisfied the stability requirements.

Abstract: The design of a external sealing structures is of much importance for the miniaturization design of valve. The metal diaphragm structure is the main component of the external sealing structure. So the mechanical behaviors of the metal diaphragm are significantly necessary to be determined for the valve design. This paper, by numerical simulations, studies the mechanical behaviors of the diaphragm, including: i) the stresses and deformations of a three-layered metal diaphragm under the loads of axial force and high pressure, and ii) the effects of the diaphragm layer number on the axial force and the maximum equivalent stress under effective external sealing. These results provide guidelines for design and application of the valve and its diaphragm.

Abstract: Precise simulation of the temperature distribution throughout welding process is basic for stress analysis. In this paper, numerical simulations and multi-factor regression were used to investigate how the three process parameters, laser power, spot radius and spot offset, influence the temperature distribution in Beryllium (Be) cylindrical shells. The experiments are designed by the compound response surface method. Based on numerical results, regression model are gained as an expression about laser power, laser spot radius and laser spot offset. Then the effects of these three parameters on temperature distribution were obtained. The results could provide guidelines for welding process of Be cylindrical shells.