Vibration reduction on city buses: Determination of optimal position of engine mounts

The improvement on vibration isolation performance of hydraulic excavators based on the optimization of powertrain mounting system

“…Similar to the work of Ashrafiuon 9 and Ashrafiuon and Nataraj, 10 Swanson et al 11 developed the method aim to engineering applications. To depress the vibration for a city bus, El Hafidi et al 12 used a 6-DOF model for powertrain mounting system and determined the optimal positions of engine mounts using the decoupling theories and minimized transmitted forces. Lee et al 13 discussed the flexible chassis on the dynamic responses of a powertrain.…”

A study on design methods for condenser radiator fan module mounting system

“…From the published papers, design methods for other different mounting systems are studied, which can be references for CRFM mounting system. In the powertrain mounting system (PMS), mount stiffness at linear section in three directions of its local coordinate system (LCS), mount locations and orientations can be obtained by optimisation of the natural frequencies, energy distributions of the powertrain rigid mode (Liu and Shangguan, 2014;Shangguan, 2009;Yu et al, 2001;Shangguan and Chen, 2012;El Hafidi et al, 2010). Mount stiffness at non-linear sections and its tuning points in the force vs. displacement curve are determined by powertrain motion control strategies (Shangguan and Hou, 2006).…”

Location of unbalance mass and supporting bearing for different type of balance shaft module

“…However, it also induces an inertia force or moment as a side effect during converting the reciprocating motion of pistons into rotating motion of crankshaft and the exact phenomenon is determined by the type of engine as well as kinematics upon several sub-components of engine system (Heisler, 1998;Stone and Ball, 2004;Serrano et al, 2015;Lui et al, 2015). Several countermeasures were previously proposed to control the excitation from vehicle engine using additional device (Lui et al, 2015;Lin et al, 2017;Shangguan et al, 2016;Hafidi et al, 2010) and balance shaft is one of novel solution among them. Balance shaft module which is generally located under the engine block is aimed for reducing the indispensable but unexpected vibrations as generating equivalent vibrations having an opposite direction (Heisler, 1998;Stone and Ball, 2004).…”

“…Several countermeasures were previously proposed to control the excitation from vehicle engine using additional device (Lui et al, 2015;Lin et al, 2017;Shangguan et al, 2016;Hafidi et al, 2010) and balance shaft is one of novel solution among them. Balance shaft module which is generally located under the engine block is aimed for reducing the indispensable but unexpected vibrations as generating equivalent vibrations having an opposite direction (Heisler, 1998;Stone and Ball, 2004). Since the fundamental role of balance shaft module can be conducted by the rotating unbalance mass on balance shaft while a target engine is under operation, the prior interest should be focused on the design of balance shaft including a strategy on unbalance mass as well as supporting bearings.…”