CAREER: Flow-Induced Instability in Rotating Machines: A Nonlinear Systems & Control Perspective

职业：旋转机器中的流动引起的不稳定性：非线性系统

• 批准号: 0447576
• 负责人: Marcio de Queiroz
• 金额: --
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-06-01 至 2011-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0447576&HistoricalAwards=false
• 关键词: CAREER; Flow; Induced; Instability; Rotating

Abstract:Rotating machines based on fluid-film journal bearings are susceptible to flow-induced instability, which are caused by the mechanical-fluid flow dynamic interaction in the rotor-bearing system. Although flow-induced instability was discovered 80 years ago, it still remains an unsolved problem. This is indicative that the two most fundamental questions remain without definite answers: Can operating conditions that cause flow-induced instability be accurately predicted? How can flow-induced instability be mitigated? The essential difficulty of the problem is flow-induced instability is a highly nonlinear, coupled phenomenon. The PI believes systems & control researchers can bring a fresh perspective to the problem through a systems theory-based approach. To that end, the research objectives of this project are: i) develop models that predict the nonlinear mechanical-fluid flow dynamic interactions, ii) exploit stability analysis tools for nonlinear systems to better characterize flow-induced instability, iii) conceive an innovative sensor/actuator paradigm for controlling the instability, and iv) synthesize nonlinear feedback controllers.LSU, like many schools, has systems & control faculty and students throughout several engineering departments. However, LSU is unique in that its Math Department is one of the few in the nation whose main focus area is mathematical control theory. To take advantage of this strength, LSU is in the process of creating a Systems & Control Group that will comprise four Engineering departments and the Math Department. The educational plan of this project will be a key component in this effort. The plan will include four activities aimed at engaging a diverse community of students, promoting cross-disciplinary interactions, and increasing the ethnic/racial diversity of students attracted to the field: i) development of a much-needed control laboratory course, ii) development of a systems & control "tune-up" workshop for graduate students, iii) involvement and mentoring of minority students through collaborations with a local HBCU, and iv) development of a systems & control summer camp for middle and high school students.This research will attract the interest of researchers in the areas of fluid mechanics, tribology, and systems & control alike. The proposed activities will advance the state-of-knowledge within and across these fields by introducing innovative bearing concepts and new control design tools for uncertain nonlinear systems and infinite-dimensional systems. The broader impacts include opportunities for minority students; outreach towards secondary education; broadening the accessibility of systems & control to students across campus and across the state; and dissemination and technology transfer via the activities and industrial partnerships of the Center for Rotating Machinery under establishment at LSU.

摘要：基于流体膜期刊轴承的旋转机容易受到流动诱导的不稳定性的影响，这是由机械流体流动动态相互作用引起的。尽管80年前发现了流动引起的不稳定性，但它仍然是一个未解决的问题。这表明这两个最根本的问题仍然没有确定的答案：可以准确预测引起流动引起的不稳定性的操作条件吗？流动引起的不稳定性如何缓解？问题的基本困难是流动引起的不稳定性是高度非线性的耦合现象。 PI认为系统和控制研究人员可以通过基于系统理论的方法为问题带来新的视角。为此，该项目的研究目标是：i）开发预测非线性机械流动流动动态相互作用的模型，ii）利用稳定性分析工具对非线性系统更好地表征流动诱导的不稳定性，iii）想象一个创新的传感器/执行器/执行器，以控制不稳定的系统，并具有多个控制范围，并具有多个控制范围，并具有多个控制的依据。以及多个工程部门的学生。但是，LSU是独一无二的，因为它的数学部门是全国为数不多的主要重点领域是数学控制理论的人之一。为了利用这一优势，LSU正在创建一个系统和对照组，该组将包括四个工程部门和数学部门。该项目的教育计划将是这项工作的关键组成部分。该计划将包括四项活动，旨在吸引多样化的学生社区，促进跨学科的互动，并增加吸引该领域的学生的种族/种族多样性：i）开发急需的控制控制实验室课程，ii）制定系统和控制“调度”工作室的“调度”工作室，以使研究生和辅助学生参与其中，iii and Incontion and Intrying and Contrancations a Anement and Contrancations a Anement and Controliv），II I III的合作，HER，II I III的协作，HH中学和高中生的夏令营。这项研究将吸引研究人员在流体力学，摩擦学以及系统与控制方面的兴趣。拟议的活动将通过引入不确定的非线性系统和无限维系统的创新轴承概念和新的控制设计工具来推进这些领域内部和跨这些领域的知识。更广泛的影响包括少数民族学生的机会；对中学教育的宣传；扩大对整个校园和全州学生的系统和控制的可及性；以及通过在LSU建立的旋转机械中心的活动和工业合作伙伴关系的传播和技术转移。