Collaborative Research: Hybrid Control of Gear System Vibration with Time-Varying Dynamics via Piezo-Composite Array

康涅狄格大学、田纳西大学和田纳西州立大学的合作项目的研究目标是建立新的理论和潜在的变革性技术，以有效地控制齿轮系统引起的振动传播。 在齿轮系统中，由于接触的齿数和齿柔性的运动变化引起的齿啮合刚度的参数变化而引起多音调振动。 在这个项目中，我们计划开发一个多层的，混合控制方法，使多音调的振动抑制参数时变齿轮系统动力学通过同时被动隔离和主动控制。 具体而言，我们将开发双周期拉伸-扭转耦合压电/复合材料支柱与可调频率阻带阻止高频振动传播，并在同一时间使用的压电传感器在支柱实现双环自适应前馈/时变反馈控制策略的基础上Floquet分解，提供主动抑制的自激振动。 通过这些创新，新方法将严格解决齿轮系统振动控制中的主要挑战，例如宽频谱多音调振动，参数激励的时变动态和非平稳响应。齿轮是许多能源、飞机、汽车和船舶系统中的关键部件。 如果成功，这项研究的结果不仅可以提高这些系统的耐用性，可靠性和效率，而且还可以改善人类的操作和生活环境。 特别是，减少齿轮引起的振动和相关的噪声排放可以在风能开发中发挥关键作用。 通过执行教育任务，PI将通过课堂教学，社区外展以及让代表性不足和少数群体的学生参与顶点项目来传播研究结果，从而为劳动力培训做出重大贡献。

The research objective of this collaborative project by University of Connecticut, University of Tennessee and Tennessee State University is to create new theories and a potentially transformative technology to effectively control the gear system-induced vibration propagation. In gear systems, multi-tonal vibrations are induced as a result of parametric variations in tooth mesh stiffness caused by kinematic variations in the number of teeth in contact and tooth flexibility. In this project, we plan to develop a multi-layered, hybrid control methodology to enable multi-tonal vibration suppression of parametric time-varying gear system dynamics via simultaneous passive isolation and active control. Specifically, we will develop bi-periodic extension-twist coupled piezoelectric / composite struts with tunable frequency stop-bands to block high frequency vibration propagation, and in the meantime employ the piezoelectric transducers in the struts to realize a dual-loop adaptive feedforward / time-varying feedback control strategy based on Floquet decomposition that provides active suppression of self-exited vibrations. With these innovations, the new methodology will rigorously address the major challenges in gear system vibration control, e.g. wide spectrum multi-tonal vibrations, time-varying dynamics with parametric excitations, and non-stationary responses. Gears are critical components in many energy, aircraft, automobile, and marine/ship systems. If successful, the outcome of this research can lead to not only increased durability, reliability and efficiency of those systems, but also improved human operating and living environment. Particularly, reduction of gear-induced vibration and associated noise emissions can play a critical role in wind energy development. By carrying out the educational tasks, the PIs will disseminate the research findings through classroom teaching, community outreach, and involving under-represented and minority group students in capstone projects, thereby contributing significantly to workforce training.