求翻译：提出了三维坐标下活塞的运动数学模型，对粗糙度进行了假定，并对在考虑粗糙度的情况下柱塞的运动方程式过进行了理论计算和分析，是什么意思？

Propose a mathematical model of the movement of the piston in the three-dimensional coordinates roughness was assumed, and consider the equations of motion of the plunger in the case of the roughness too theoretical calculations and analysis

The 3D coordinates the movement of the piston, and mathematical models of roughness to the assumption that to be considered and roughness of the equations of plunger movement in the theoretical calculations and analysis.

Proposed the three dimensional coordinates lower piston movement mathematical model, has carried on the hypothesis to roughness, and to the plunger movement equation has carried on the theoretical calculation and the analysis in the consideration roughness situation,

Proposed a mathematical model of three dimensional coordinate system piston, to assume that the roughness and in consideration of roughness of piston motion equations for calculation and analysis of the theory,

正在翻译，请等待...