ERI: System Tautochronic Pendulum Vibration Absorbers for Next-Generation Propulsion Systems and Other Machinery

ERI：用于下一代推进系统和其他机械的系统等时摆减震器

• 批准号: 2347632
• 负责人: Ryan Monroe
• 金额: $ 20万
• 依托单位: Oakland University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-07-01 至 2026-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2347632&HistoricalAwards=false
• 关键词: ERI; System; Tautochronic; Pendulum; Vibration

This Engineering Research Initiation (ERI) award supports research that enables the development of unique vibration and noise control technologies to reduce vibrations in rotating systems, including helicopter rotors and crankshafts of internal combustion engines widely used in fuel-efficient conventional and hybrid electric vehicles powertrains, thereby promoting the progress of science, advancing prosperity and welfare, and securing the national defense. The research will generate new fundamental knowledge related to the design of centrifugal pendulum vibration absorbers (CPVAs) for the next-generation of electrified machinery that has the potential to improve both propulsion efficiency and driver experience for hybrid electric and electric vehicles. CPVAs consist of pendulums mounted on a rotor, driven by system rotation, and when properly tuned, can efficiently smooth problematic vibration-inducing torsional surging during operation. Current state-of-the-art overtuning approaches of a CPVA and rotor system will result in reduced vibration correction performance for a given absorber mass. This project will solve this challenge via a novel tautochronic tuning approach, which has the potential to enable more direct tuning without stability concerns, thereby reducing added driveline inertia required to achieve performance objectives. This award will also support community outreach and student research projects involving industry collaborations and the development of new curriculum in electrified propulsion engineering and training of a diverse STEM workforce. This research aims to make fundamental contributions to a system tautochrone tuning methodology, which consists of a path for the absorber mass to follow that accounts for the inertial coupling of the absorber to the base (rotor), and results in a constant period free vibration of the system that is independent of amplitude. This tuning methodology and its enhancements to vibration absorber design has been identified in a gravity field, but a number of important scientific questions and challenges remain for the centrifugal field. Similar to the gravity field, conditions for the tautochronic tuning in a centrifugal field will be obtained from a general period function for this oscillator that is derived by transforming the differential equation to a standard form, and then requiring that the polar angular speed is independent of the polar radial coordinate. The tautochronic tuning conditions will generally consist of a nonlinear differential equation for the radius of curvature of the absorber path, whose solution is the system tautochronic motion path. A fundamental difference in the centrifugal field is that the oscillator coefficients depend on the system momentum constant. Consisting of both absorber and rotor motion, this generalization to system momentum could revolutionize the concept of order-tuning, where a system tautochronic path is expected to remain tuned across all momentum levels, instead of just rotor speeds, as has been understood for many decades.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该工程研究启动奖(ERI)支持研究开发独特的振动和噪声控制技术，以减少旋转系统的振动，包括直升机转子和内燃机曲轴，这些发动机广泛用于节能型传统和混合动力电动汽车的动力总成，从而促进科学进步，促进繁荣和福利，并确保国防安全。这项研究将产生与下一代电动机械的离心摆式减振器(CPVA)设计相关的新的基础知识，该机械有可能改善混合动力和电动汽车的推进效率和驾驶体验。CPVA由安装在转子上的钟摆组成，由系统旋转驱动，当适当调整时，可以有效地消除运行过程中有问题的振动诱发的扭转喘振。目前最先进的CPVA和转子系统的过调方法将导致对给定吸振器质量的振动校正性能降低。该项目将通过一种新颖的跨时调谐方法解决这一挑战，该方法有可能实现更直接的调谐，而不会影响稳定性，从而减少实现性能目标所需的额外传动系统惯性。该奖项还将支持涉及行业合作的社区推广和学生研究项目，以及电力推进工程新课程的开发和多样化STEM劳动力的培训。这项研究的目的是为系统常计时调谐方法做出基本贡献，该方法由吸振器质量遵循的路径组成，该路径考虑了减振器与基础(转子)的惯性耦合，并导致系统的恒定周期自由振动与振幅无关。这种调谐方法及其对减振器设计的改进已在重力场中确定，但离心场中仍有许多重要的科学问题和挑战。与重力场类似，离心场中的等时调谐条件将从振子的一般周期函数中得到，该周期函数是通过将微分方程式变换为标准形式而得到的，然后要求极角速度与极径向坐标无关。紧同步调谐条件一般由一个关于吸振器路径曲率半径的非线性微分方程式组成，其解是系统的紧同步运动路径。离心场的一个根本区别是振子系数取决于系统的动量常数。由减振器和转子运动组成的这种对系统动量的概括可能会彻底改变阶调的概念，即系统的等时路径预计将在所有动量级别上保持调谐，而不是几十年来一直被理解的仅仅是转子速度。这一奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。