Through comparison, it shows that at the same value of frequency and size, the far field of hexagonal piston is more uniform than that of circular piston.
结果表明，与圆形、方形活塞的辐射远场相比，在声波频率、活塞面积相同条件下，六边形活塞声源的辐射远场相对比较均匀。
A built-up circular piston sound source is established in this paper. The directivity formula of its far field is obtained, and its validity is simulated.
依据本文构造的组合圆形活塞声源，导出了该声源远场指向性公式，并对其正确性和有效性进行了仿真研究。
Thin, circular, steel bands fit into grooves around the piston to seal the bottom of the combustion chamber.
把薄的，圆形的，钢圈放进活塞周围的凹槽以密封燃烧室的底部。
In simplest terms, piston rings are thin, circular pieces of metal that fit into grooves in the tops of the pistons.
简单地讲，活塞环就是装在活塞顶部的凹槽里的薄，圆的金属。
The circular tube grouting test was made by the established model of grouting slurry tube in rock mass and using piston type grouting pump commonly used in grouting engineering.
通过建立岩体中灌浆管状模型，利用灌浆施工中常用的活塞式灌浆泵，进行了圆管模型灌水(浆)试验。
The circular tube grouting test was made by the established model of grouting slurry tube in rock mass and using piston type grouting pump commonly used in grouting engineering.
通过建立岩体中灌浆管状模型，利用灌浆施工中常用的活塞式灌浆泵，进行了圆管模型灌水(浆)试验。
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