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以某V型压缩机的曲轴-滚动轴承系统为研究对象,利用ADAMS动力学仿真软件,研究了额定工况作用下曲轴-滚动轴承系统的动力学行为和动力学优化设计问题。首先应用Hertz公式和超静定问题的解法(力法)推导滚动轴承受力与变形关系的计算公式并得到数值解,再以整个曲轴-滚动轴承系统为研究对象,在ADAMS中建立弹性曲轴-滚动轴承系统动力学仿真模型并求解,得到了额定工况下主轴承反力、曲轴轴颈中心径向振动响应。以此为基础,建立曲轴-滚动轴承系统动力学优化设计数学模型,该模型以两个主轴承曲轴轴颈中心径向振动响应振幅的加权平均值为目标函数,以压缩机气缸中心线夹角为设计变量。最后利用参数化建模技术建立ADAMS优化模型并进行设计研究,得到了设计变量与目标函数之间的关系和最优解。所得到的结论对压缩机动态设计有指导意义。
Taking a crankshaft-rolling bearing system of a V-type compressor as the research object, the dynamic behavior and dynamic optimization design of the crankshaft-rolling bearing system under rated conditions are studied by ADAMS dynamic simulation software. Firstly, the formula of Hertz formula and the solution of statics (method) are deduced to calculate the relation between bearing capacity and deformation of rolling bearing, and the numerical solution is derived. Then the whole crankshaft-rolling bearing system is taken as the research object, and the elastic crankshaft-rolling bearing system is established in ADAMS Dynamic simulation model and solved, obtained under the rated conditions of the main bearing reaction force, the center of the crankshaft journal radial vibration response. Based on this, the dynamic optimization design mathematical model of crankshaft-rolling bearing system is established. The model takes the weighted average of radial vibration response amplitudes of journal center of two main bearing crankshafts as the objective function, and the angle between the centers of compressor cylinders is design variable. Finally, the parametric modeling technology is used to establish the ADAMS optimization model and carry out design and study. The relationship between the design variables and the objective function and the optimal solution are obtained. The conclusions obtained are of guiding significance to the dynamic design of compressors.