characteristic of logarithm造句

• Characteristic of logarithm
  对数的首数
• The basic principal and general structure of dry gas seal are introduced briefly , and aiming at the characteristics of logarithm spiral curve , the calculation of the pressure to the spiral groove end surface by the theory of narrow groove are given . the method of narrow groove theory and finite element method are utilized to optimize the end surface structure of the spiral groove dry gas seal . the structure of the seal is confirmed on the base of the result
  简要介绍了干气密封的基本原理和一般结构，同时针对对数螺旋线形的特点，介绍了窄槽理论对螺旋槽端面的压力分布计算，利用窄槽理论和有限元方法对螺旋槽干气密封端面结构进行了优化，并得出了优化结果，根据这一结果，确定了具体的密封结构。