Abstract

This paper presents a new configuration to tackle a twofold problem affecting a crankshaft: the torsional vibrations and the oscillation of the speed at the back end of the shaft due to the torque ripples created by the cylinders. These two phenomena already have industrial solutions, but the requirement levels increase and impose constant improvements. Moreover, the common vibration dampers rely on energy dissipation as heat, which in a context of waste reduction could be avoided. This concept relies on the association of an optimal passive mechanical damper, an electric circuit and electromechanical converters, without any external power supply, in order to ensure a safe operation. From a more fundamental point of view, these elements link a time-periodic correction and a nonstationary cyclic excitation. The core idea of the concept is to enable a redistribution of the energy within this coupled electromechanical circuit, where each element can behave as a power consumer or supplier, so that the oscillations of the mechanical elements can be decreased. In this paper, the authors describe and model this new concept in order to investigate the resulting dynamic behavior and the key design parameters that affect the damping performance.

摘要

本文提出了一种新的配置来解决影响曲轴的双重问题：由于气缸产生的扭矩波动，轴后端的扭转振动和速度振荡。这两种现象已经有了工业解决方案，但要求水平不断提高并不断改进。此外，常见的减振器依靠能量耗散作为热量，这在减少废物的情况下是可以避免的。这一概念依赖于最佳被动机械阻尼器、电路和机电转换器的组合，无需任何外部电源，以确保安全运行。从更基本的角度来看，这些元素将时间周期性校正和非平稳循环激励联系起来。该概念的核心思想是在这个耦合的机电电路中实现能量的重新分配，其中每个元件都可以充当电力消耗者或供应者，从而可以减少机械元件的振荡。在本文中，作者对这一新概念进行了描述和建模，以研究由此产生的动态行为和影响阻尼性能的关键设计参数。