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基于系统的观点,提出装载机动力系的外界激励谱;根据相似原理,提出无因次外界激励谱和外界激励相似假设;介绍统计仿真的基本原理和数值算法。 相似文献
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本文通过建立装载机柴油机—液力机械传动系系统分析模型,将装载机传动系载荷谱与计算机仿真,优化设计技术综合运用于该系统的设计。 相似文献
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Melting temperature,spreadability,mechanical properties and the microstructures of joints brazed with silver-base filler metals including different amounts of Ga and/or In were studied respectively in this paper,and the results show that the melting temperature of the silver-base filler metals is decreased,spreadability of the silver-base filler metals is improved,and the microstructures of silver-base filler metals are refined obviously with the addition of Ga and/or In.Using copper and brass plates as base metal and brazing with flame method,the mechanical properties of the lap-joint and butt joint were also examined and analyzed respectively,and the results indicate that the fracture position of two kinds of brazed joints occurred on the base metal,except for the lap-joint of brass,which shows better mechanical properties of the joints brazed with the silver-based filler metals including Ga.For the lap-joint of brass,the tensile strength gradually increased with the increase of Ga content,while the addition of In has little effect on mechanical properties.It is also found that the best comprehensive properties of cadmium-free Ag-Cu-Zn filler metals are obtained when Ga content is about 3.0 wt.% and In content is between 1.5 wt.% and 2.0 wt.%. 相似文献
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CNC系统中一般曲线的双圆弧逼近 总被引:1,自引:0,他引:1
本文介绍了在CNC系统中,根据曲线方程,快速建立双圆弧逼近的一种计算方法。 相似文献
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卢方 《南昌大学学报(工科版)》1998,20(2):74-78
从椭圆弧投射法的角度出发,通过正交椭圆柱和椭圆锥交线的分析,找到了交线上最右点的几何特性,由此得到了一种简单而实用的求最右点的作图方法,然后分析并提出了其它二次曲面交线最右点的作图方法。 相似文献
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通常在修理 XQ 和 XW 系列仪表更换滑线电阻条时都是两人配合手工操作,结果不是装配后电阻条绕制松紧不宜,就是线性超差,难以达到技术要求(电阻条是φ0.2mm 镍铬锰硅丝绕在φ1.5mm 的漆包线上制作而成,镍铬锰硅丝具有弹性,不易定型)。我试制了一个简单的装配修理滑线电阻条的夹具(见图)。经使用效果较好,操作方便。各项技术指标均符合技术要求。 相似文献
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采用粘塑性有限元法,针对三种不同基板材料,对Sn3.8Ag0.7Cu焊点的应力及应变进行分析.结果表明,FR-4基板对应焊点的最大应力集中在焊点最内侧的尖角处;LTCC基板对应焊点的最大应力集中在焊点最外侧的尖角处;PTFE基板对应焊点的最大应力集中在焊点和引线交界的尖角处.三种基板材料中,FR-4基板对应焊点的残余应力最小,LTCC基板对应焊点残余应力最大,PTFE基板对应焊点居中.运用Anand方程计算得出Sn37Pb钎料的分析结果和Sn3.8Ag0.7Cu钎料对应的结果具有相同的规律.对基板厚度进行的优化模拟计算结果表明,基板厚度为0.8mm时对应焊点的残余应力最大. 相似文献
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