排序方式: 共有7条查询结果,搜索用时 15 毫秒
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In order to analyze the maximum power density error with different heat flux distribution parameter values for double ellipsoidal heat source model, a general expression of double ellipsoidal heat source model was derived from Goldak double ellipsoidal heat source model, and the error of maximum power density was analyzed under this foundation. The calculation error of thermal cycling parameters caused by the maximum power density error was compared quantitatively by numerical simulation. The results show that for guarantee the accuracy of welding numerical simulation, it is better to introduce an error correction coefficient into the Goldak double ellipsoidal heat source model expression. And, heat flux distribution parameter should get higher value for the higher power density welding methods. 相似文献
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采用独立分量分析的方法和传感器阵列技术对点焊声音信号进行了研究,建立了点焊声音信号独立分量分析算法.采用8个传声器阵列,同时对点焊过程中的声音信号进行了测量,获得了比单传感器丰富的点焊信息.计算了这些声音信号的峰度系数,确认其为非高斯型,满足独立分量分析的要求,并对其进行独立分量分析.结果表明,基于FastICA算法的独立分量分析可以从叠加噪声中分离出点焊过程信号源,且效果明显,为深入分析点焊过程提供了一个新的技术手段,并且该算法可以应用于其它焊接方法中. 相似文献
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Resistance spot welding(RSW) is an efficient and convenient joining process for aluminum alloy sheet assembly. Because the RSW has the character of energy concentration and quick cooling rate, the microstructure transformation of the base metal can be confined in the least limit. The material properties and the welding parameters have significant effects on thequality of the nugget. To predict the microstructure evolution in the melted zone and the heat-affected zone, an electrical, thermal, metallurgical and mechanical coupled finite element model is described and applied to simulate the welding process of the 6082 aluminum alloy. Experimental tests are also carried out. The comparison between experimental and numerical results shows that the adopted model is effective enough to well interpret and predict some important phenomena in terms of the phase transformation in spot welding of 6082 aluminum alloy. 相似文献
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AA754和AA6082是两种具有不同强化机制的铝合金材料,在电阻点焊加热过程中,两种铝合金材料的组织会发生不同类型的转变.通过采用不同的计算模型,使用有限元软件对两种铝合金点焊后不同焊接组织的分布进行了模拟和预测.通过焊接试验研究,对两种铝合金的点焊组织的形态和分布进行了观察.结果表明,所采用的两种计算模型可以有效的预测和反映出两种铝合金点焊组织变化过程中的一些现象.仿真结果和试验结果都显示出两种铝合金的点焊组织有着明显不同的特征. 相似文献
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