spiral surface meaning in English

螺面

Study on data approximate approach of spiral surface profile
螺旋曲面廓型的数值拟合方法研究
On the action of magneto mechanical coupling of rotating magnetic field generated by turning of exterior driver , robot was spun to generate propulsion in axial direction under the function of fluid dynamic pressure distributed on spiral surface of the robot , as a result , spiral and drive motion of the capsule type micro robot in intestine was realized
通过外驱动器的旋转产生旋转磁场，借助于磁机耦合作用，驱动机器人旋转并在其外螺纹表面形成的流体动压力作用下产生轴向推力，进而实现胶囊式机器人在肠道内旋进。