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对折弯钣金件的传统展开方法与现代Pro/E展开方法进行了比较分析,并列举了应用实例.总结了Pro/E展开法在折弯钣金件过程中的注意事项.阐明了Pro/E的展开方法应用在折弯钣金件展开中的优越性、实用性.为现代折弯钣金件展开提供了一种实用的工具. 相似文献
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苏宏延 《机械工程与自动化》2006,(4):142-143
通过对钣金件加工中Pro/E展开方法与传统展开方法的比较分析,阐明了钣金件Pro/E展开方法的优越性、实用性、经济性,总结了Pro/E钣金展开过程中应注意的事项,为钣金件展开加工提供了一种实用、高效的展开工具。 相似文献
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小波变换轮廓术中快速相位展开方法研究 总被引:2,自引:1,他引:2
针对小波变换轮廓术中相位展开的精确性和快速性问题,提出了一种新的适用于小波变换轮廓术的相位展开方法.在使用小波变换得到条纹图像的相对相位分布的基础上,详细分析了利用小波变换脊处的尺度因子建立质量图指导相位展开的理论依据和实现方法,这种质量图建立方法有效反映了条纹图像各点的可靠性.在相位展开方面,针对全局洪水相位展开算法计算时间较长的问题,提出了根据质量图将相对相位分布图分层,然后逐层采用不同算法展开的方法.与全场洪水相位展开算法相比,该方法在保持较高测量精度的同时极大减少了相位展开所需的运算时间.计算机仿真和实物测量实验说明使用该方法可以得到准确的绝对相位值,处理速度较快. 相似文献
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弯曲件坯料展开尺寸的计算 总被引:1,自引:0,他引:1
介绍弯曲件坯料展开尺寸计算的2种方法:公式近似计算法和Pro/E钣金展开计算法,进行了比较分析,阐明Pro/E钣金展开方法在钣金件展开尺寸计算中的优越性,实用性。 相似文献
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讨论了90°弯头展开图的计算方法,给出了展开图的计算公式,为其精确展开提供了理论依据,避免了繁琐的投影平行线法的作图步骤,为工程技术人员提供了一种可借鉴、有价值的展开图计算方法,有利于提高管道施工质量,缩短施工周期。 相似文献
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对圆锥台钣金件的传统展开方法与应用Solid Edge钣金模块进行展开的方法做了分析比较.并通过一个实例介绍了Solid Edge钣金模块展开圆锥台钣金件的具体过程和注意事项,阐明了该种方法可以精确、快速、直观地展开各种不同的圆锥台钣金件,大大提高了饭金件设计的精确率及效率. 相似文献
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比较了传统钣金展开方法与现代利用参数化三维软件的自动展开方法,并基于Pro/E建立了钣金自动展开零件库,列举应用实例,阐明了Pro/E的自动展开方法的优越性、实用性。 相似文献
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细分曲面由于没有整体解析表达式,与参数、隐式曲面相比求交更加困难。针对基于平面四边形网格的Catmull-Clark细分曲面,在给定精度条件下,把对细分曲面的求交转化为对一定细分层次控制网格的求交:首先构造两张控制网格上相交四边形网格带及其1-邻域网格带,然后不断细分相交四边形网格带及其1-邻域网格带,提高求交精度,其次求解出相交四边形网格的交点,并根据拓扑关系将其顺序连接起来既得到两细分曲面之间的相交曲线,实现了细分曲面的求交。 相似文献
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基于特征实体模型上的截面轮廓自动特征识别方法 总被引:5,自引:1,他引:5
复杂零件特征实体上的相交特征自动识别问题,仍是CAD/CAPP领域未解决的难点。本文提出了基于特征实体模型上的截面轮廓造型自动特征识别方法,并制定了一系列各类特征的合理识别规则和识别算法。这种方法探索了一条实现自动特征识别的新途径,实现了对复杂箱体类零件的加工加工特征自动识别与信息自动提取,从而实现了CAD/CAPP系统的信息自动传递。 相似文献
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以城市相邻交叉路口为研究对象,提出了一种相邻交叉路口的神经网络模糊控制的方法.将相邻交叉路口看作一个大系统,第1级控制各个单交叉路口,调整各方向的绿信比;第2级协调单元利用各路口测得的交通流数据,确定相邻交叉路口的周期和相位差.应用MATLAB编写了仿真程序,仿真结果表明,该方法可以有效减少相邻交叉路口车辆的平均延误. 相似文献
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In this paper, a bilateral prediction and intersection calculation autofocus method for automated microscopy, which obtains the in‐focus position by calculating the intersection of the predicted left and right focus measure curves located respectively in the left and right sides of the peak position of the focus measure curve, is proposed and performed. According to the autofocus method, the area including the peak position of the focus measure curve and its left and right neighbourhoods should be determined firstly, and the left and right neighbourhoods are considered as the left and right sampling areas. The left and right focus measure curves are predicted by appropriate predicting models according to the two sample sequences, which comprise the focus values by evaluating the sampled images in the left sampling area and right sampling area, respectively and their corresponding sampling positions. The intersection of the predicted left and right focus measure curves is calculated and can be considered as the in‐focus position. The autofocus can be realized by moving the focus plane of the microscope to the intersection of the predicted left and right focus measure curves. The proposed bilateral prediction and intersection calculation autofocus method is experimentally verified in an automated light microscopy for implementing microassembly and micromanipulation. The theoretical analyses have shown that the proposed bilateral prediction and intersection calculation autofocus method can not only effectively avoid the principle error caused by assuming the symmetrical focus measure curve in the autofocus methods based on curve fitting, but also eliminate the possible waver search near the peak position in the modified fast climbing servo method. The experimental results have shown that the proposed bilateral prediction and intersection calculation autofocus method possesses the merits as follows: (1) the focusing accuracy is high and slightly affected by the sampling step size and (2) the focusing speed is higher than those of the 7‐point hill‐climbing search method and the quadratic curve fitting method with a determinate focusing accuracy. 相似文献
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阐述了基于细分曲面数控加工刀具轨迹的生成方法,主要包括求交点的算法和对交点进行优化处理的算法,该方法具有一定的可行性和实用性。 相似文献
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原计算机绘制渐开线齿轮封闭图有着十分重要的意义,由于组成封闭图的各曲线比较复杂,所以,各曲线交点不能用解析法求得,而须用数值计算的方法,本文通过三个典型的例子,对求交点的数值解法作了较详细的说明。 相似文献
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Hyung-Bae Jung 《Journal of Mechanical Science and Technology》1995,9(1):51-67
A method for solving the problem of surface/surface intersection in suggested. This method uses an adaptive subdivision and a facetted model based on triangles. A bounding box and a different dividing method are newly developed. Instead of the calculation of the characteristic points, a new linking technique is developed. This method solves the intersection problem between bicubic or higher grade surfaces. The desired caculation-precision is specified by the input parameter. 相似文献