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the same geological condition, vertical and radial displacement of soil surrounding tapered pile respectively increases with the increase of the pile sinking depth and taper angle, both the position... value is 0.92%-2.04% of the average pile diameter. The piling pressure increases, and the increasing velocity is enhanced with the increase of the pile sinking depth and taper angle. Key words......
of solidity, wind direction, the rate of length and width and taper, CFD simulations of angled lattice tower under wind load were carried out in different cases. Simulation results were compared... solidities are small and the shielding effect increases with the increase of solidities. With the increase of taper, drag coefficients increase. For towers with tapers in common use, the influence is little......
. The microstructure of different regions in the onion ring was inferred to correlate the strength with the metal flow pattern. The onion ring pattern strengthened the weld nugget. Shoulder and taper threaded..., and five different tool profiles such as plain cylindrical pin, cylindrical threaded pin, plain taper pin, taper threaded pin (TTP), and shoulder & taper threaded pin (STTP). The parameters were......
silencer at the muzzle end of the gun barrel, in comparison with the tank gun without silencer. Also, the sound pressure level at different points in the ambient region shows the same attenuation... to the explosion of the propellant inside the gun barrel. The deflagration of the propellant in the chamber produces an abrupt expansion of gases. This rapid increase in volume causes pressure waves which......
;90°. A hole taper is diminished, and the machining accuracy is improved with the mask wall angle increasing. Key words: electrochemical machining; matrix-hole; machining accuracy; current density...° is obviously less than that for β≥90°. Furthermore, the significant improvement on hole taper is caused by the increase of the mask wall angle. The machining accuracy of β=120° is higher than that for β......
and reliability of the theoretical model built in this paper was verified by comparing with model test results. Then, influence pile parameters (such as, enlarged pile base, and taper angle, etc... 楔形角对抗拔承载力的影响 Fig. 5 Effect of taper angles on uplift bearing capacity 3.3 桩长的影响规律 桩长对桩体抗拔承载力的影响规律曲线如图6所示.由图6(a)和图6(b)可知:桩体抗拔承载力随着桩长的增加而非线性增加,增大的趋势变陡,说明增加桩长可以有效地提高桩的抗拔承载力；当桩长一定时,桩体抗拔承载力......
with the function of nozzle taper, gas volume fraction and jet velocity 3.4 喷距 喷射速度为265 m/s时,喷距(0.5~2.0 cm)对喷射壁面冲击压力的影响规律如图7所示.由图7可见:随着喷距增大,射流冲击壁面压力逐渐减小,当喷距大于1 cm(5倍喷嘴直径)时,射流对壁面冲击力迅速降低.当喷距小于1 cm时,壁面在等速......
the barrel and the rubber ring of shell body during an launching process of aerodynamic extinguishing cannon, a rubber sealing model with bionic dimpled characteristics was established based on the theory......
, such as taper barrel rheomoulding process (TBR) [9], introducing grain process (IGP) [10], serpentine channel pouring rheo- diecasting (SCRC) process [11-13], equal channel angular extrusion (ECAE......
1780热连轧机精轧机组辊型优化技术的设计及应用戚向东1,董志奎1,岳晓丽1,连家创1,张文志1(1.河北省秦皇岛市燕山大学轧机研究所)摘 要:根据宁波钢铁1780热连轧机精轧机组采用的"窜辊+辊型+弯辊"的技术方案以及设备特点,以板形和板凸度质量和轧辊使用寿命为前提条件,优化设计精轧机组的轧辊辊型曲线.工作辊采用燕山大学连家创教授VCSW专利辊型,支承辊采用平辊+辊端辊型,根据典型规格产品进行辊型优化设计计算.配合燕山大学设计的板形控制系统,经生产考核,带钢板凸度命中率达到96%以上,带钢平直度良好.
