Low noise design of a truck timing multi-stage gear: robust optimization of tooth surface modifications

Abstract

This study focuses on the optimization of the micro geometry of gear tooth flank in order to minimize the Static Transmission Error level as a key of low whining noise design. The studied mechanical system is an actual truck timing multi mesh geared system. The optimization problem was efficiently addressed by the Particle Swarm Optimization. In addition, Monte Carlo simulations allowed to estimate robustness of the retained optimal solutions. On this basis, gear wheels have been manufactured within the class quality 7. Experimental tests on an actual truck engine power train reveal very significant sound power level gain.