In 1966 Jorgen W. Lund published an approach to find the dynamic coefficients of a journal bearing by a first order perturbation of the Reynold's equation. These coefficients made it possible to perform a rotor-bearing stability analysis for a statically loaded bearing. In the mid seventies Jorgen W. Lund pointed out in lecture notes that the dynamic damping coefficients of the bearing could be used to find the shaft orbit for dynamically loaded bearings. In the present paper this method is further developed and utilized to determine the dynamic behavior of a piston ring in a combustion engine. The basic idea is to use the fluid film damping coefficients to estimate the film thickness variation for a piston ring under cyclic varying load. Reynolds Equation is solved for a piston ring and the oil film thickness is determined. In this analysis hydrodynamic lubrication is assumed and the effect of the squeeze motion is considered.
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机译：1966年，约尔根·隆德（Jorgen W. Lund）发表了一种方法，该方法通过对雷诺方程的一阶扰动来查找轴颈轴承的动态系数。这些系数使得可以对静载荷轴承进行转子轴承稳定性分析。七十年代中期，Jorgen W. Lund在演讲中指出，轴承的动态阻尼系数可用于找到动态负载轴承的轴轨道。在本文中，该方法被进一步开发并用于确定内燃机中活塞环的动态行为。基本思想是使用流体膜阻尼系数来估计活塞环在周期性变化载荷下的膜厚变化。解决了活塞环的雷诺方程，并确定了油膜厚度。在此分析中，假定采用流体动力润滑，并考虑了挤压运动的影响。
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