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- W4387617772 abstract "Methods to reduce the vibration amplitude of blisks are essential to ensure the safe operation of turbomachinery. Resonant vibration absorbers (RVAs) can be used to mitigate vibrations of structures through energy transfer and absorption. Specifically, an RVA is a friction damper with possible impacts that is tuned to the natural frequency of the blisk, allowing energy transfer from the beam to the damper. The state of the art for blisk nonlinear dynamics includes contact models that capture the energy dissipation from friction dampers. Several recent studies have focused on modeling Coulomb friction and repetitive impacts to analyze their effects on reducing vibration amplitudes in blisks. This chapter explores the effectiveness of RVAs in dissipating energy in blisks through impacts. To do so, methods combining finite element modeling, reduced order modeling, and nonlinear structural dynamics are used to analyze the forced response of a beam that resembles a blade in a blisk equipped with an RVA. Specifically, an RVA is attached near the root of the beam where the beam experiences only small displacements similar to locations under the rim of blisks. The RVA device provides impacts at two surfaces connected to the host structure, namely, the beam. The dynamics of the system is analyzed using the harmonic balance method to account for nonlinear impact forces. Dynamic effects of impacts are simulated with a novel microscopic model that captures local material elasticity and viscosity. Results show that increasing the local stiffness of the impact areas shifts the first resonance of the beam tip response to higher frequencies. In addition, increasing the damping of the material at the impact areas decreases the beam response amplitude at resonance. Furthermore, a reduction in the impact time per cycle is observed with increasing material damping. Finally, the best RVA performance is observed when the beam and damper are moving out of phase." @default.
- W4387617772 created "2023-10-14" @default.
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- W4387617772 date "2023-10-14" @default.
- W4387617772 modified "2023-10-15" @default.
- W4387617772 title "Resonant Vibration Absorbers with Impacts" @default.
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- W4387617772 doi "https://doi.org/10.1007/978-3-031-36999-5_31" @default.
- W4387617772 hasPublicationYear "2023" @default.
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