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Mechatronic system design---A hydraulic-based engine cooling system design and refinement of a technical elective mechatronics course.

机译：机电一体化系统设计---基于液压的发动机冷却系统设计和选修机电一体化技术课程。

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摘要

The improvement of consumer products and industrial processes, in terms of functionality and reliability, has recently focused on the integration of sensors and real time controllers with attached actuators into the given physical system. The likelihood of long-term market penetration of smart devices has placed an emphasis on preparing engineering graduates for technology leadership roles in the workforce. This thesis examines mechatronic systems in two manners. First, an intelligent automotive internal combustion engine cooling system is studied for ground vehicles using hydraulic actuators which offer the opportunity for greater versatility and performance. Second, improvements to a technical elective mechatronics course at Clemson University in the Department of Mechanical Engineering have been completed to offer a better educational experience for both undergraduate and graduate students.;Traditional and modern internal combustion engine cooling systems typically use a mechanical wax based thermostat along with a number of mechanical and/or electric actuators to remove the excessive heat of combustion from the engine block. The cooling system's main objective is to maintain the engine temperature within a prescribed range which optimizes engine performance and promotes mechanical longevity. However, the cooling system adds to parasitic engine losses and vehicle weight, so a mechatronic based smart thermal management system has been designed to explore the higher power density and controllability of hydraulic actuators. In this research project, the experimental data has been initially gathered using a 4.6L gasoline engine with a mechanical wax based thermostat valve, engine driven coolant pump, and a hydraulic motor driven radiator fan with classical feedback control. A series of mathematical models for the hydraulic, electric, and thermal automotive subsystems have been developed to estimate the engine, coolant, and radiator temperatures as well as the overall system performance for various operating conditions.;The experimental test platform features a medium duty eight cylinder internal combustion engine, stand-alone radiator, engine dynamometer, smart cooling system components, high speed data acquisition system, and real-time control algorithm with associated sensors. Specifically, J-type and K-type thermocouples measure the engine block, coolant, and radiator core temperatures at various locations. A multiplexer switches these input signals at predetermined intervals to accommodate the large number of temperature probes. Further, optical sensors measure the engine and radiator fan speeds, and pressure sensors record the hydraulic line pressures. A hydraulic direction control valve was used to adjust the speed of the radiator fan. The experimentally recorded engine data was compared with the numerical simulation results to estimate the engine's thermal behavior for warm up and idle conditions. The findings demonstrated that the proposed experimental model and mathematical models successfully controlled the engine temperature within +/-1.5°K. In the future, the mathematical models can be used for linear quadratic regulator and Lyapunov-based nonlinear controllers after further refinement and the addition of state variables for the engine thermal management system.;To implement such a mechatronic-based cooling system, engineers must have a fundamental understanding of system dynamics, control theory, instrumentation, and system integration concepts. Given the growing industrial demand for graduates with diverse engineering knowledge, a mechatronic systems course has been designed in the Department of Mechanical Engineering at Clemson University. This mechatronics course, ME 417/617, has been designed to introduce both engineering and personal skills. The students, who would successfully complete the course, will be able to join global work teams designing smart products. The course uses various teaching paradigms such as classroom activities, laboratory experiments, team based design projects, and plant tours to introduce the concepts and offer hands-on experience. As part of a continuous improvement process, the course has been evaluated using assessment methods such as pre- and post-tests, qualitative measures, and advisory panel observations.;Over a four course offering period (2008--2011), the pre- and post-tests reflect improvements in the students' personal growth (7.0%), team building (12.8%), mechanics/engineering (25.4%), and human factor (17%) skills. The qualitative assessment was completed using student feedback regarding the course content. Most of the students reported that they liked the course and its "hands-on" experimental approach. An advisory panel, consisting of industry experts, course instructors, and faculty analyzed the progress of students and evaluated the course materials. The advisory panel's recommendations established the direction for continuous improvements to successfully teach the concepts of mechatronics and better meet the student needs. Going forwards, the mechatronic systems course will serve an important role in preparing graduates for future endeavors.
机译：在功能和可靠性方面，消费产品和工业流程的改进最近集中在将传感器和实时控制器以及连接的执行器集成到给定的物理系统中。智能设备的长期市场渗透的可能性使人们着重于为工程学毕业生为劳动力中的技术领导角色做好准备。本文以两种方式研究机电一体化系统。首先，针对使用液压致动器的地面车辆研究了一种智能型汽车内燃机冷却系统，这为提高多功能性和性能提供了机会。其次，对克莱姆森大学机械工程系的机电选修课程进行了改进，以为本科生和研究生提供更好的教育经验。传统和现代内燃机冷却系统通常使用基于机械蜡的恒温器连同许多机械和/或电动执行器一起从发动机缸体中去除多余的燃烧热。冷却系统的主要目的是将发动机温度保持在规定的范围内，从而优化发动机性能并提高机械寿命。但是，冷却系统增加了寄生的发动机损失和车辆重量，因此已设计了基于机电一体化的智能热管理系统，以探索液压致动器的更高功率密度和可控性。在此研究项目中，最初使用具有机械蜡基恒温阀，发动机驱动的冷却液泵和液压马达驱动的带有经典反馈控制的4.6L汽油发动机收集了实验数据。已开发出一系列用于液压，电气和热力汽车子系统的数学模型，以估算发动机，冷却液和散热器的温度以及各种工况下的整体系统性能。该实验测试平台具有中等工作能力8气缸内燃发动机，独立散热器，发动机测功机，智能冷却系统组件，高速数据采集系统以及带有相关传感器的实时控制算法。具体来说，J型和K型热电偶可在各个位置测量发动机缸体，冷却液和散热器核心温度。多路复用器以预定的间隔切换这些输入信号，以适应大量的温度探测器。此外，光学传感器测量发动机和散热器风扇的速度，压力传感器记录液压管路的压力。使用液压方向控制阀来调节散热器风扇的速度。将实验记录的发动机数据与数值模拟结果进行比较，以估计发动机在预热和怠速条件下的热性能。这些发现表明，提出的实验模型和数学模型成功地将发动机温度控制在+/- 1.5°K之内。将来，在进一步完善和添加发动机热管理系统的状态变量后，该数学模型可用于线性二次调节器和基于Lyapunov的非线性控制器。要实现这种基于机电一体化的冷却系统，工程师必须具备以下条件：对系统动力学，控制理论，仪表和系统集成概念有基本了解。鉴于工业对具有多种工程知识的毕业生的需求不断增长，已经在克莱姆森大学机械工程系设计了机电一体化系统课程。机电一体化课程ME 417/617旨在介绍工程技术和个人技能。成功完成课程的学生将能够加入设计智能产品的全球工作团队。该课程使用各种教学范例，例如课堂活动，实验室实验，基于团队的设计项目和工厂参观，以介绍概念并提供动手经验。作为持续改进过程的一部分，已使用评估方法对课程进行了评估，例如测验前和测验后，定性措施和咨询小组的观察结果。在四个课程的提供期间（2008--2011年），测验和测验反映出学生的个人成长（7.0％），团队建设（12.8％），机械/工程学（25.4％）和人为因素（17％）技能的提高。使用有关课程内容的学生反馈来完成定性评估。大多数学生报告说，他们喜欢该课程及其“动手”实验方法。咨询小组，由行业专家，课程讲师组成，然后教师会分析学生的进度并评估课程材料。咨询小组的建议确定了持续改进的方向，以成功教授机电一体化的概念并更好地满足学生的需求。展望未来，机电一体化系统课程将在为毕业生准备未来的工作中发挥重要作用。

著录项

  • 作者

    Patil, Rajwardhan Bhaskarrao.;

  • 作者单位

    Clemson University.;

  • 授予单位 Clemson University.;
  • 学科 Education Industrial.;Engineering Mechanical.
  • 学位 M.S.
  • 年度 2012
  • 页码 163 p.
  • 总页数 163
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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