Multiparticle Impact Damping (MPID) Design Methodology for Extreme Environments

摘要

Vibration mitigation is often required in aerospace structures, including engine subsystems. Yet, established damping methods are not effective in high-temperature environments. Multiple particle impact damping (MPID) is a promising technology that can be effective over a wide temperature range. Energy is dissipated as particles within a damping system impact one another and the walls of their enclosure. The actual design of this type of damping is complex, and this research focused on development of a design methodology. Analytical modeling capability is central to the methodology. Details of several modeling approaches are therefore described. Beginning with single particle designs, methods were developed for describing effects of variation in key parameters, including particle size and fill factor. Structures from simple cantilevered beams and built-up structures were used to test analysis predictions. The damping effectiveness was demonstrated at elevated temperatures. Particle damping design guidelines were established and successfully employed in an application.