Targeted energy transfer and modal energy redistribution in automotive drivetrains
journal contributionposted on 07.09.2016, 13:21 by Eliot Motato, Ahmed Haris, Stephanos Theodossiades, Mahdi Mohammadpour, Homer Rahnejat, P. Kelly, A.F. Vakakis, D.M. McFarland, L.A. Bergman
The new generations of compact high output power-to-weight ratio internal combustion engines generate broadband torsional oscillations, transmitted to lightly damped drivetrain systems. A novel approach to mitigate these untoward vibrations can be the use of nonlinear absorbers. These act as Nonlinear Energy Sinks (NESs). The NES is coupled to the primary (drivetrain) structure, inducing passive irreversible targeted energy transfer (TET) from the drivetrain system to the NES. During this process, the vibration energy is directed from the lower-frequency modes of the structure to the higher ones. Thereafter, vibrations can be either dissipated through structural damping or consumed by the NES. This paper uses a lumped parameter model of an automotive driveline to simulate the effect of TET and the assumed modal energy redistribution. Significant redistribution of vibratory energy is observed through TET. Furthermore, the integrated optimization process highlights the most effective configuration and parametric evaluation for use of NES.
The authors wish to express their gratitude to the UK Engineering and Physical Sciences Council (EPSRC) for the financial support extended to the project entitled “Targeted energy transfer in powertrains to reduce vibration-induced energy losses” Grant (EP/L019426/1), under which this research was carried out. Thanks are also due to Ford Motor Company and Raicam Clutch for their technical support, as well as to AVL List for providing access to the multi-objective optimization software: CAMEO.
- Mechanical, Electrical and Manufacturing Engineering