circumnutation

The friction of stern seal structure caused by shaft circumnutation may be the reason causing this add-noise.

结合试验实测数据对船舶低速航行时出现附加噪声的现象进行了分析,论述了轴系回旋运动加剧艉部密封结构摩擦引发附加噪声的发声机理。

An anti_whirl technology keeping the lateral forces and cutters balanced on PDC bit for slim_hole drilling is proposed.

针对小井眼PDC钻头的实际工作条件 ,提出了在小井眼钻井中具有普遍意义的PDC钻头的横向力自平衡抗回旋技术。

The intrinsic viscosity and the radius of gyration of polymers were studied in this paper,and t.

通过红外光谱分析、热分析、X射线衍射分析对接枝共聚物结构进行了验证,并对接枝共聚物特性黏数和大分子回旋半径进行了研究。

The radius of gyration(Rg) described quantitative network aggregation structure scales and polymerization.

应用X射线小角散射技术(SAXS)测定和研究了由溶胶凝胶法合成的CaO-Al2O3-SiO2系列(GCAS)低维硅酸盐分子网络的介观结构,研究结果表明低维硅酸盐分子网络的分数维值(D)定量反映了网络构象的蠕变特征,回旋半径(Rg)定量描述了网络团粒结构的尺度及其聚合程度,这些参数对低维硅酸盐材料的结构表征及其开发应用,提供了重要的理论依据。

For 6 commercial polymers of various molar mass,M,the root mean square values of radius of gyration in a simulation formation water of TSD=20 g/L are determined at 70℃ and,based on these values and a core permeability,K,vz throat radius median,R50,relationship published where else,it is concluded that a core of Ka=0.

实测了油藏温度下(70℃)相对分子质量M不同的6种聚合物,在矿化度20 g/L的模拟油田地层水中的分子线团均方根回旋半径,根据文献发表的渗透率Ka~孔隙半径中值R50关系,由这些回旋半径值判定,Ka=0。

Investigation in anti-whirl PDC bit.;

新型挠性抗回旋PDC钻头研究