Nerubenko, G., "Torsional Vibration Damper with Micro-channel Tuners," SAE Technical Paper 2014-01-1691, 2014, doi:10.4271/2014-01-1691.
The results of dynamical study of new patented Torsional Vibration Damper for an engine crankshaft are presented. Design and structure of Torsional Vibration Damper is based on author's US Patent 7,438,165 having the control system with instantaneous frequencies tuner for all frequencies in running engine. Basically the tuner should be designed in three optional manners: having mechanical structure, electromechanical structure with control system and micro-channels filled by electrolyte solution. The focus of the study is on Torsional Vibration Damper equipped with micro-channels filled by electrolyte solution. Mathematical model based on the system of ordinary differential equations describing the rotation and vibration of mechanical components combined to Navier-Stokes equations reflecting the fluid flow and Poisson - Boltzmann equations applicable for electrolyte solution flow in micro-channels has been used for the analysis of the dynamic behavior of engine crankshaft system having proposed Torsional Vibration Damper. Attention is paid to mitigation of the torsional vibrations by dynamically stable no-leakage fluid filled subsystem. Tests have been conducted in order to get objective metrics and compare the dynamic performance of new device to dynamic data of conventional torsional vibration dampers. The acceptable in automotive industry magnitude of torsional vibration peak - to - peak twist angles is 0.4 degrees. The tested prototype of Torsional Vibration Damper equipped with micro-channel tuners allowed reduces this number to 0.10 degrees.