June 18, 2006
June 18, 2006
June 21, 2006
Division Experimentation & Lab-Oriented Studies
11.187.1 - 11.187.19
AN EXPERIMENT BASED STRUCTURAL DYNAMICS COURSE FOR ENGINEERING TECHNOLOGY STUDENTS
This paper describes a Structural Dynamics course for engineering technology students with emphasis on the understanding of the theoretical concepts by using lab experiments. The experiments involve a minimum amount of equipment. The experiments are of increasing levels of theoretical complexity. The first two experiments involve single degree of freedom systems. The first one is a mass-spring system with translational motion, and the second is a rotational beam with an added mass and a spring attached to develop an understanding of the rotational inertia and resulting natural frequency. The third experiment consists of a simply supported aluminum beam which is used to compare the theoretical and experimental values of the first three natural frequencies via a frequency- domain data analysis. The fourth and fifth experiments use a simply supported reinforced concrete beam and a simply supported prestressed concrete beam made by the students in the Reinforced Concrete and Prestressed Concrete courses. The first natural frequencies of the original beams were obtained experimentally and compared with the theoretical values showing good agreement. Also, the natural frequency shows a reduction, after testing of the beams up to the ultimate (cracked) condition. These experiments show that the first natural frequency changes with the integrity of the beams. The sixth experiment consisted of finding the first two natural frequencies of a steel frame model. The properties of the frame were obtained using the geometry and results of static tests. The frame was then dynamically excited with an electromagnetic device actuated by an electronic signal generator. The theoretical values of natural frequencies were obtained using structural analysis software and they showed good agreement with the experimental results. Engineering Technology students increase their understanding of how dynamic systems perform while also learning laboratory techniques for dynamic response testing. Verifying laboratory obtained natural frequency against theoretically computed values provides students with robust knowledge of dynamic system behavior.
Structural Dynamics is an important subject for engineering technology students, because the principles are essential for understanding different conditions such as vibration control, earthquake and wind impact design. Structural Dynamics involves difficult theoretical and practical concepts for a typical under-graduate engineering technology student. However, if the course is taught using computer programs and experimental tests with data acquisition systems, the learning curve of the main concepts of structural dynamics may be improved. This approach is used in the Department of Engineering Technology, University of Houston – Downtown.
Tito-Izquierdo, J., & Gomez-Rivas, A., & Feng, W., & Pincus, G. (2006, June), An Experiment Based Structural Dynamics Course For Engineering Technology Students Paper presented at 2006 Annual Conference & Exposition, Chicago, Illinois. https://peer.asee.org/912
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