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Item type:Publication, Access status: with files , Optimal design of particle dampers for structures with low first eigenfrequency under forced vibrationRecently, the rolling attribute of spheres has been used to develop efficient particle dampers for horizontal low amplitude vibrations. As long as the particle container’s acceleration stays below the gravitational acceleration, this rolling effect of spheres can be used. Hereby, the estimation of the damper’s energy dissipation is accurately possible using analytical formulas. In this paper, the workflow for a systematic damper design for an underlying structure of low first eigenfrequency under forced vibration is presented. The analytical formulas describing the dampers energy dissipation are coupled to a modal reduced model of the utilized vibrating structure. Then an analytical expression for an optimal damper design is derived. Also, the calculation scheme to obtain the frequency response function of the system is presented. As application example, a simple beam-like structure is used, whereby its base point is subjected to a harmonic motion of variable frequency using a linear drive. The particle damper is mounted at the tip of the beam and its velocity is measured using a laser scanning vibrometer. Thus, the frequency response function is obtained experimentally. A good agreement between analytical and experimental obtained frequency response function is achieved for the optimized particle damper, validating the presented approach.Publicationtype: Conference PaperScopus© Citations 2 145 338 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Toward a design methodology for particle dampers by analyzing their energy dissipationParticle dampers show a huge potential to reduce undesired vibrations in technical applications even under harsh environmental conditions. However, their energy dissipation depends on many effects on the micro- and macroscopic scale, which are not fully understood yet. This paper aims toward the development of design rules for particle dampers by looking at both scales. This shall shorten the design process for future applications. The energy dissipation and loss factor of different configurations are analyzed via the complex power for a large excitation range. Comparisons to discrete element simulations show a good qualitative agreement. These simulations give an insight into the process in the damper. For monodisperse systems, a direct correlation of the loss factor to the motion modes of the rheology behavior is shown. For well-known excitation conditions, simple design rules are derived. First investigations into polydisperse settings are made, showing a potential for a more robust damping behavior.Publicationtype: Journal ArticleScopus© Citations 27 240 303 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Experimental and numerical investigations on parameters influencing energy dissipation in particle dampers(International Center for Numerical Methods in Engineering (CIMNE), 2019-10); Particle damping has become a favorable passive damping technique for light weight structures, however, its complex dimensioning process hinder its wide use in technical applications. An experimental based model and a numerical model are developed in order to investigate the energy dissipation of the dampers regardless of the underlying structure. The experimental model consists only of the particle box with a free-free boundary condition, which is excited by a harmonie force. Via the complex power, the loss factor and the energy dissipation are obtained. A corresponding numerical discrete element model is developed. With these models, a large frequency and acceleration range is analyzed. Different filling ratios of the particle box are investigated, indicating the high potential of particle dampers for ditterent excitation ranges. First comparisons of experiments and simulations showing a good qualitative agreement, enabling the simulation as a future design tool for particle dampersPublicationtype: Conference PaperScopus© Citations 5 162 179