DN：名义直径

“Diameter Nominal”通常缩写为DN，这种简写形式常用于学术及物理学相关领域，便于快速书写和使用。其中文译名为“名义直径”，通常指代管道、阀门等工业或工程构件在标准规格中所采用的标称直径值，而非其精确的物理尺寸。

This paper gives a niethod for determing the relatlonship between diameter and nominal breaking force of API steel wire rope.
特大跨径悬索桥对钢丝绳吊索的要求越来越高，要求吊索钢丝绳在保证直径和抗疲劳能力的前提下提高其破断拉力。
The mathematical model of optimum design for the pressure vessel is derived. This model takes the minimum mass of shell as objective function, and takes internal diameter & nominal diameter and nominal thickness as the design variables.
建立了以壳体质量最轻为设计目标、以内径（公称直径）和名义壁厚为设计变量的优化设计的数学模型。
A measurement method of gauge pin distance about center gear of swing oscillating tooth drive, and the equation for calculating the gauge pin diameter dp and nominal pin distance M are derived.
提出了摆动活齿传动中心齿轮量柱距测量法，推导出计算量柱直径dp、量柱距公称值M的方程式；
Bypass Valve with nominal diameter of the same nominal diameter pipeline, pressure level pressure level is also consistent with the process.
旁路阀公称直径与管道公称直径相同，耐压等级也与工艺耐压等级一致。
Investigation of the Relations among Frit Diameter, Average Intercept and Nominal Diameter of Crystall Grain
晶粒的弗里特直径、平均截距、公称直径之间关系的研究

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