Study on functional specification scheme on interface based on positioning features

Study on functional specification scheme on interface based on positioning features
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基于定位特征的界面功能规范方案研究

DOI:
10.1177/0954405413479112
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发表时间:
2013-05
期刊:
Proc IMechE Part B: J Engineering Manufacture
影响因子:
--
通讯作者:
YanlongCao
YanlongCao
中科院分区:
其他
文献类型:
--
作者:
YanlongCao

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本文提出了一种符合新一代几何产品规格的功能规格方案。该方案是将复杂机构的几何功能需求分解为定义在关键部件上的几何规格。用图论对装配进行了分析。对一般几何功能要求进行分析,必要时进行分解,并对端部零件规定几何公差。然后根据基准参照系和公差带的不变自由度建立几何变化模型,验证基准参照系对定位特征的充分性,从而推断出对功能起关键作用的关节。通过制定一系列拓扑规则并应用验证算法,验证基准参照系,生成结合面的详细规范。这些基础部件或组件的规范随后被定义为新的几何功能要求,并应进一步开发。因此,设计人员可以进行有效的递归方法,既能实现关键特征上的每个几何规格,又能保证整个装配的功能公差。最后通过实例验证了该方法的有效性。
This article proposes a scheme for functional specification in accordance with the new generation of geometrical product specification. The scheme is to decompose a geometrical functional requirement on a complex mechanism into geometric specifications defined on key parts. The assembly is analyzed by graph theory. The general geometrical functional requirement is analyzed and decomposed if necessary, with geometrical tolerances specified on ending parts. Then geometric variation model is built according to the invariant degree of freedom of both datum reference system and tolerance zone, which is subsequently used to validate the sufficiency of the datum reference frame on positioning features, thereby inferring joints that perform key roles in affecting function. After a series of topological rules formulated and validation algorithm applied, datum reference system is validated and detailed specifications are generated on joint surfaces. Those specifications on underlying parts or subassemblies are then defined as new geometrical functional requirements and should be further developed. Therefore, the designer can carry out an effective recursive approach capable of realizing each geometric specification on key features while ensuring functional tolerancing of the entire assembly. A case study is given to validate the proposed method.
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