GOALI: Transient Dynamics of Torsional Vibration Absorbers

GOALI：扭转减振器的瞬态动力学

• 批准号: 0700307
• 负责人: Steven Shaw
• 金额: --
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0700307&HistoricalAwards=false
• 关键词: GOALI; Transient; Dynamics; Torsional; Vibration

The goal of this GOALI project is to investigate the transient dynamics of rotor systems fitted with torsional vibration absorbers. An improved understanding of these systems is directly relevant to their implementation in automotive engines that employ cylinder deactivation. The range of engine speeds over which one can deactivate cylinders is limited on the low-rpm end by vibration problems. If these vibrations can be reduced, the operating envelope for cylinder deactivation can be expanded, resulting in substantial fuel savings and lower emissions. Centrifugal pendulum vibration absorbers show great promise for providing the required vibration reduction, and are being considered for use in these engines. The PIs have developed a thorough understanding of the steady-state operation of these absorbers, but their implementation in automobile engines depends on their satisfactory behavior under transient operating conditions. Thus, the primary goal of this work is to develop a fundamental understanding of the transient dynamics of rotors fitted with systems of pendulum absorbers, and the manner in which system parameters affect this behavior. The results of this effort will expand our fundamental knowledge base about the behavior of vibration absorber systems and, more generally, about the transient response of systems with symmetries. The investigation will involve analysis, experiments, and collaboration with industry. The analysis will involve modeling, perturbation methods, and concepts from invariant manifolds and symmetry theory. Experiments will be carried out for different absorber tuning and damping conditions and various types of transient conditions. The results are of fundamental interest since they involve questions of transient response, including stability issues that are often overlooked in studies of periodically forced dynamical systems. The results will also allow for the development of guidelines that can be used in the design of absorber systems for automotive engines.In order to address broader impacts, the PIs will serve for three years as instructors for the Michigan State University High School Engineering Institute. About a quarter of the enrollment for this summer outreach program comes from under-represented groups. Energy issues will be the primary focus topic of the program, and the proposed research will be described in that context. The industrial PI will influence program content by providing a general industrial perspective on advanced engine technology. In addition, the material will be incorporated in existing courses, specifically as motivation for the importance of studying problems relevant to transient vibration response. Also, in order to fully realize the benefits of this investigation, the results will be made widely available through publications and conference presentations, thereby making them accessible to all interested automotive manufacturers.

该目标项目的目的是研究装有扭转振动吸收器的转子系统的瞬态动力学。对这些系统的改进了解与它们在使用缸停用的汽车发动机中的实施直接相关。振动问题在低RPM结束时，可以停用气缸的发动机速度范围受到限制。如果可以减少这些振动，则可以扩展气缸停用的操作包膜，从而可节省大量燃料并降低排放。离心摆吸收器在提供所需的振动降低方面表现出巨大的希望，并正在考虑用于这些发动机。 PI已经对这些吸收器的稳态操作有了彻底的了解，但是它们在汽车发动机中的实现取决于它们在瞬态工作条件下的令人满意的行为。因此，这项工作的主要目标是对带摆吸收器系统的转子的瞬态动力学发展基本理解，以及系统参数影响此行为的方式。这项工作的结果将扩大我们关于振动吸收器系统行为的基本知识基础，更普遍地是关于与对称性的系统的瞬时响应。调查将涉及与行业的分析，实验和合作。该分析将涉及建模，扰动方法以及来自不变流形和对称理论的概念。将对不同的吸收器调整和阻尼条件以及各种类型的瞬态条件进行实验。结果是基本的兴趣，因为它们涉及瞬态响应问题，包括在定期强迫动态系统的研究中经常忽略的稳定性问题。结果还将允许制定可用于汽车发动机的吸收器系统的准则，以解决更广泛的影响，PIS将担任密歇根州立大学高中工程学院的讲师三年。大约四分之一的夏季外展计划入学人数来自代表性不足的团体。能源问题将是该计划的主要重点主题，并将在这种情况下描述拟议的研究。工业PI将通过提供先进发动机技术的一般工业视角来影响计划内容。此外，该材料将纳入现有课程，特别是研究与瞬态振动响应相关的问题的重要性。同样，为了充分实现这项调查的好处，结果将通过出版物和会议演讲广泛使用，从而使所有感兴趣的汽车制造商都可以使用。