Elastic Constants of Na and K from Non-parameter Perturbation Calculation

Combining a linear muffin-tin orbital method, which can be used to calculate the total energy and pressure of solids in a self-consistent manner, with a generalized elastic energy equation, a non-parameter perturbation method has been proposed to compute the elastic constant for cubic metals. The pressure dependence of the shear modulus and bulk modulus forNa and K was calculated. It was found that the computed results agree well with experiments.

航空发动机可调叶片角度校准工装设计方法

发动机产品设计时定义了可调叶片开关的角度,由于零件制造和装配误差的影响,实际角度值与理论值并不吻合,因此需要设计专用的可调静叶角度校准工装对机构进行校准。本文主要介绍了大型某民用航空发动机叶片调节工作原理、可调叶片角度校准工装分类及结构、设计计算等内容。