The performance of a pulse suppressor, currently used to alleviate pump-induced noise in automotive power steering systems, was characterized in this research. A hydraulic test system was developed to evaluate the noise attenuation effects of a pulse suppressor as well as other devices. Four pressure transducers were used to measure the dynamic pressures in the pressure line at different locations (two before and two after the suppression device); thus it was possible to determine the transfer matrix elements relating line pressures to noise. The transmission loss (the criteria used to determine the noise isolation performance of a noise reduction device) for this device was also estimated. The test system was verified by using a 0.52-meter section of steel tubing. Good agreement was obtained between the experimental and theoretical matrix elements.
The subject of automotive systems remains an enduring area of great interest to many mechanical engineering students. This paper presents a pilot mechanical engineering course that stimulates student interest to a high degree. Significant advances in engineering methods, tools, and practices over the years have resulted in tremendous quality improvements in the production of consumer goods. While this trend is desirable and strenuously pursued by the engineering community, the implication for mechanical engineering is that students will have less exposure to the inner workings of machines, devices and their components. Simply stated, if it doesn't break down, it won't need fixing or investigating. Many mechanical engineering programs now have a Mechanical Dissection course to address this lack of exposure to the inner workings of representative consumer products. Many students love the automobile and want to know how its subsystems function. Students show heightened levels of interest when examples involving the automobile are used during instruction. Clearly, much engineering knowledge ca n be transferred through the use of examples and case studies within a framework to which students can relate. We at Tuskegee University are using automotive systems applications as a foundation for teaching a variety of engineering concepts and methods. To this end a course in which students immerse themselves in the fundamentals of automobiles has been developed. This 3-hour senior elective course entitled Automotive Systems Design serves as an exciting platform for introducing various applications of engineering principles. The main topics of the course are vehicle performance, powertrain, suspension, and braking. A survey of students taking the course indicates a high level of interest in the course. One indicator of student interest is the approximately four-fold increase in the number of questions asked during lectures.
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