In rotating machinery with a flexible foundation used for vibration isolation, the drive (motor) is designed to provide maximum power at the critical speed so that the rotor can be coasted up to a supercritical operating speed. Over the time, rotors develop some degree of unbalance and it may be impossible to balance the rotors in-situ, such as in a wind turbine. Therefore, oversized motors are used in anticipation of some unbalance. To promote passage through resonance, without altering the motor, various kinds of additional hardware and/or control mechanisms have been proposed in the past. On the other hand, simply increasing the foundation (or structural) damping reduces the amplitude of unbalance induced vibrations and the motor power requirement at the critical speed. This appears to be the simplest possible solution and has been proposed in relevant mathematical research. However, it is shown in this article that increasing foundation damping significantly reduces the overall system efficiency at the supercritical operating speed and it should not be at all considered as a meaningful engineering solution. In fact, the loss of efficiency due to the increased foundation damping is so large that it may not be compensated by a redesigned motor.

在具有用于振动隔离的柔性基座的旋转机械中，驱动器（电机）设计为在临界转速下提供最大功率，因此转子可以惯性升至超临界运行速度。随着时间的流逝，转子会出现某种程度的不平衡，并且可能无法就地平衡转子，例如在风力涡轮机中。因此，在预期会出现一些不平衡的情况下使用超大型电动机。为了在不改变电动机的情况下促进通过共振的通过，过去已经提出了各种附加的硬件和/或控制机构。另一方面，仅增加基础（或结构）阻尼会降低不平衡感应振动的幅度，并降低临界转速下的电机功率要求。这似乎是最简单的解决方案，并且已在相关的数学研究中提出。但是，本文表明，在超临界运行速度下，增加地基阻尼会显着降低整体系统效率，因此，这根本不应该被视为有意义的工程解决方案。实际上，由于增加的基础阻尼而导致的效率损失如此之大，以至于无法通过重新设计的电动机来补偿。