June 22, 2008
June 22, 2008
June 25, 2008
13.763.1 - 13.763.14
Integrating Experiment, Modeling and Design using a Hands on Hydraulic Positioning Laboratory for Mechanical Control Systems Education
As part of a laboratory intensive curriculum, Mechanical Engineering students at California Polytechnic State University, San Luis Obispo are required to take a senior level class in Mechanical Control Systems. In addition to three one-hour lectures, students attend a weekly three hour laboratory session where course concepts are reinforced through hands-on modeling and experimentation. This paper describes a newly implemented and innovative laboratory experience which is centered on a hydraulic position control system. Often experiments in Mechanical Controls are heavily influenced by non-linearities such as friction or backlash which cause inexperienced students to lose confidence in linear system modeling as an effective analysis and design tool. A hydraulic system was chosen for this laboratory due to excellent correlation between experimental results and the linear modeling techniques taught in the course. This laboratory experience is designed to integrate linear system modeling techniques, experimentation and data collection, control system design, and design verification through physical testing using a variety of hardware and software tools. The main objectives of the laboratory are to give the students practice and confidence in advanced control system modeling, experience with precision hydraulic positioning systems, practice in designing Proportional- Integral (PI) controllers, exposure to digital control systems and experience and physical understanding of the sometimes dramatic condition of instability. The methodology includes a unique procedure that uses root locus concepts and asks the students to drive the system to instability to determine system parameters. The paper describes the laboratory experience in detail and gives some example results and an assessment of student learning.
California Polytechnic State University – San Luis Obispo (Cal Poly) founded in 1903 is one of 23 campuses of the California State University (CSU) System. Cal Poly is primarily an undergraduate institution with approximately 19,500 enrolled undergraduates and 1180 faculty. Roughly 5000 students are enrolled in the College of Engineering which is comprised of nine departments. The largest department, Mechanical Engineering, has approximately 1000 undergraduates, 40 Masters Students and 23 full time tenure and tenure track faculty. The department awards about 190 BSME degrees each year.
Laboratory Intensive Curriculum Cal Poly’s University wide motto is “Learn by Doing,” which is supported by the Mechanical
Widmann, J., & Birdsong, C., & Ridgely, J., & Owen, F. (2008, June), Integrating Experiment, Modeling And Design Using A Hands On Hydraulic Positioning Laboratory For Mechanical Control Systems Education Paper presented at 2008 Annual Conference & Exposition, Pittsburgh, Pennsylvania. https://peer.asee.org/4036
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