Experimental study conducted on a liquid-filled combined conical tank model

Elevated water tanks are often built with a superstructure vessel consisting of a truncated cone with a top superimposed cylindrical cap. Such vessels are referred to as ‘combined conical tanks’. This study is motivated by the lack of procedures for the seismic analysis and design of such structures. It reports the first experimental study conducted on a small-scale combined liquid-filled conical shell model. Shake table testing is conducted to determine the fundamental frequencies as well as the frequencies of vibration of the modes during which the cross section of the tank remains circular (cos(θ)-modes). The later are responsible for the base shear force and overturning moment acting on the tank.Results of the experiments are used to validate the assumptions employed in a previously developed analytical model for the free surface sloshing motion and a numerical model for the vibration of the liquid-shell system. In general, excellent agreements are shown between the analytical and the experimental results as well as between the numerical and the experimental findings.     

Critical load of a bilayered orthotropic elastic–plastic conical shell with the change of the shell basic surface location

The paper presents the derivation of stability equations and the comparison of critical loads for an orthotropic elastic–plastic conical shell with proper location of the shell basic surface. Prandtl–Reuss plastic flow theory is accepted in the analysis. To derive the stability equations the variational method was accepted and Ritz method was used to solve the equations. Numerical results were obtained by the use of a special iterative algorithm of the elastic–plastic analysis implemented on the PC.     

锥形拉深件的可成形性分析及工艺研究

通过研究锥形拉深件的变形特征,确定了锥形件在拉深过程中的起皱部位,并通过模拟结构和试模结果验证了这一结论的科学性;利用Dynaform软件对锥形拉深件的无压边、平面压边和锥形压边的拉深过程进行数值模拟,分析了三种情况下的拉深状态,从而确定了合理的拉深成形方案;通过对模具结构的改进,解决了侧壁起皱问题,可生产出合格产品。此方法为锥形拉深件的成形工艺提供了实际参考价值。     

Methanol steam reforming integrated with oxidation in a conical annulus micro-reactor

A micro-channel reactor with circular cross section was numerically studied. Inside the inner cylinder and the annulus section, steam reforming and oxidation reactions were occurred, respectively. With the variation in diameter of the annulus section along the reactor length, the effect of diameter changing was also studied. In this case, outer section is an incomplete cone. The results showed that conical annulus (right inlet) micro-reactor (when the diameter of the cone decreased along the reactor length) represents higher temperatures and conversions. Then, influences of some parameters were considered in this micro-reactor. With increasing some parameters such as inlet temperature and the steam to carbon ratio of inlet flow, methanol conversion increases, and increasing some other parameters such as flow rate, solid thickness and porosity of bed leads to the methanol conversion decreases as well. Effect of various diameters in this micro-reactor was considered. Also when oxidation reaction happened inside outer cone, the better results was represented.     

均匀外压下的锥壳减速机试验

有关壳结构屈曲性能的研究日益增多,尤其是锥壳。然而,有关细长柱端壳体减速机的足尺模型和实际模型的屈曲性能试验研究还较缺乏。试验研究和分析3个锥壳减速机在均匀周边压力下的屈曲性能。进行有限元模拟和理论分析,比较屈曲荷载和变形模式。在研究范围内,收集足尺锥壳减速机的有关数据。