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ME643 - Elements of DesignFinal Project (Fall 2010-2011)
The internal combustion engine has been a dominant device for converting the chemical energy of a fuel to mechanical work, especially in the transportation sector. In its history of 120-140 years, numerous concepts have been proposed and implemented. In most of them, the linear, reciprocating motion of a piston is converted into the rotational motion of a shaft through a suitable kinematic mechanism. This mechanism is usually the simple slider-crank – which you examined in detail in your Dynamics course. However, the need to increase the performance of an engine, including its fuel efficiency and to reduce the overall weight/volume, have brought numerous other concepts to the forefront. Many of these involve the idea an Opposed Piston Engine. We will be studying the kinematic mechanism of one such concept, which has been implemented in the past in at least one case: the Tilling-Stephens TS3 engine that was used in Commer trucks and other commercial vehicles in the U.K. between 1954 and 1974. The formal classification of this engine is "two stroke, folded crankshaft, three cylinder, opposed piston diesel". Schematics of this engine are given in Figures 1 and 2. For the purposes of this project, we will only examine the basic mechanism of the engine, given in Figure 3. The gas pressure in the real engine will be replaced here with a spring.
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