支承在滑动轴承里的轴的振动性能方程式不是线性的。但是方程式的解对活塞式发动机特别重要,因为在连杆轴承和主轴承上有严重的动载荷。这些载荷是由往复质量的惯性力和活塞顶上的气体压力所组成的。通常轴承设计除了在发动机起动工况外,应使油膜厚度不低于一个预定的安全值。这些方程式的现有数值解法中,都假设轴承保持正圆的形状。这种假设 The vibration performance equation for the shaft supported in a plain bearing is not linear. But the solution to the equation is of particular importance for piston engines because of the severe dynamic loads on the rod bearings and main bearings. These loads are made up of the reciprocating mass inertia and the pressure of the gas at the top of the piston. In general, the design of the bearing should be such that the thickness of the oil film is not less than a predetermined safety value except for the starting condition of the engine. In the existing numerical solutions to these equations, it is assumed that the bearing maintains a perfectly round shape. This assumption