To investigate the process optimizationof Cu-en/AP composite microspheres preparation via electrostatic spraying,and to reveal the effects of droplet properties and flow rate variations on the experimental results during the electrostatic spraying process,the prepared process parameters of Cu-en/AP composite microspheres by electrostatic spray method under the orthogonal experimental design simulated by ANSYS(Fluent).The influence of flow rate,solvent ratio,and solid mass on the experimental results is examined using a controlled variable method.The results indicate that under the conditions of a flow rate of 2.67×10^(-3)kg/s an acetone-to-deionized water ratio of 1.5∶1.0,and a solid mass of 200 mg,the theoretical particle size of the composite microspheres can reach e nanoscale.Droplet trajectories in the electric field remain stable without significant deviation.The simulation results show that particle diameter decreases with increasing flow rate,with the trend leveling off around a flow rate of 1×10^(-3)kg/s.As the solvent ratio increases(with higher acetone content),particle diameter initially decreases,reaching a minimum around a ratio of 1.5∶1.0 before gradually increasing.Increasing the solid mass also reduces the particle diameter,with a linear increase in diameter observed at around 220 mg.Cu-en/AP composite microspheres with nanoscale dimensions were confirmed under these conditions by the final SEM images.
针对苏北某引水渡槽水利工程开展地震动力响应特征分析,利用ANSYS有限元软件,建立三维有限元模型,分析渡槽结构自振特性与地震动力响应特征。结果表明:①研究了有无水工况下渡槽结构振型分布特征,分析了水流作用对渡槽振型特征影响较弱。②渡槽结构自振频率均与计算阶次呈正相关,但前10阶次自振频率增长幅度高于后10阶次,有水工况下自振频率显著低于无水工况,第1阶次下有水工况相比无水工况降低26.2%。③地震动荷载下,渡槽支撑结构中下部承台应力值最大,达1.77 MPa;渡槽各特征点同一方向的加速度时程曲线一致,顺渡槽向峰值加速度均维持在0.35 m/s 2,但竖向峰值加速度相比顺渡槽向降低51.4%。研究结果可为引水渡槽等水工结构动力响应特征研究提供一定参考。
