Abstract
Nonlinear energy sink (NES) is a passive device to achieve vibration absorption. In this device, the transfer of energy between the linear oscillator and the NES is accomplished through a targeted energy transfer (TET). The irreversible transfer of energy is effectively used in a number of practical applications to reduce the vibration of externally excited systems. NES generally has a small mass, an essentially nonlinear stiffness element, and a damper to dissipate the energy. Previous studies considered the dam** in the system as an idealized linear viscous damper. In this chapter, a velocity–displacement-dependent nonlinear dam** mechanism obtained by the geometric configuration of linear viscous damper is considered. NES with geometric nonlinear dam** is implemented on a two-degree-of-freedom system with the primary mass excited harmonically. The dynamics of the system is investigated using the complex-averaging method (CXA) to identify the slow and fast modulations. Periodic solutions of the system are obtained by the harmonic balance method (HBM). Parametric continuation is carried out to acquire the frequency response plots. Compared to the one with linear viscous dam**, the NES with geometric nonlinear dam** is found more effective. The regions of strongly modulated resonance (SMR) are also identified by numerical simulations. This chapter provides an insight into the use of nonlinear dam** mechanisms in NES and helps to develop efficient passive vibration absorption systems based on NES.
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Philip, R., Santhosh, B., Balaram, B. (2022). Dynamics and Performance Analysis of a Nonlinear Energy Sink with Geometric Nonlinear Dam**. In: Lacarbonara, W., Balachandran, B., Leamy, M.J., Ma, J., Tenreiro Machado, J.A., Stepan, G. (eds) Advances in Nonlinear Dynamics. NODYCON Conference Proceedings Series. Springer, Cham. https://doi.org/10.1007/978-3-030-81166-2_9
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