基于热源数学模型的电子束焊接仿真

建立合理的热源分布数学模型可以提高电子束焊数值模拟的计算精度。常用的热源数学模型有磁盘形、双椭球形和圆锥形热源分布模型。根据焊接任务,对圆锥形热源模型加以改进,建立了不等壁厚管件的电子束焊接数值分析模型,通过与物理实验进行对比,分析了电子束焊过程的温度场分布以及应力场分布,并验证了改进后热源分布数学模型的准确性。

铝合金搅拌摩擦焊接起始阶段温度场分析

根据库仑摩擦做功理论,建立了12.7mm厚6061-T6铝合金板搅拌摩擦焊接过程中起始阶段(搅拌针旋转扎入工件的过程)的热输入数学模型,通过实验和有限元模拟对其进行分析验证,进而得到搅拌针起始阶段的瞬态温度场分布。结果表明,该起始阶段的热源数学模型具有较高的计算精度,对于确定旋转速度、垂直压力等工艺参数具有一定的指导意义。

Research on ground heat exchanger of Ground Source Heat Pump technique

Ground Source Heat Pump technique and its operating principle are described in this paper. Ground heat exchanger is the key technique of ground source heat pump and its patterns are discussed. Software is helpful to design ground heat exchanger. A project of Chinese Ground Source Heat Pump is introduced and its market is more and more extensive.