Visualization of ultrasonic wavefront patterns using a liquid-surface as the recording medium

http://www.worldcat.org/oclc/960715

Design of a dry sump lubrication system for a Honda® CBR 600 F4i engine for Formula SAE applications

Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2006.Includes bibliographical references (leaf 34).A dry sump lubrication system for a Formula SAE race car was designed and manufactured in order to gain the various advantages this type of system affords. A dry sump system stores oil in an external tank and pumps it between the engine and tank as needed. This allows for a shallower oil pan, which permits lower engine placement. This lower placement improves handling through a lower center of gravity. Additionally, the highly stressed racing engine, a Honda CBR 600 F4i, receives more constant lubrication than a conventional wet sump system. The system included design of a new pan, tank and the associated bracketry and hoses that are needed to make the system functional. The design of the system stressed reliability while keeping an eye on weight to minimize it whenever possible. Detailed analysis and the methodology driving the design choices are presented here along with simple dry sump theory. This document serves as the roadmap through the design of the first dry sump system on an MIT FSAE car. It should prove beneficial to the team when the official design report is created for the competition. Lastly, it will help assist future members who certainly aim to refine the package in subsequent years to make it smaller, cheaper, lighter, more reliable and simply better performing overall.by Ehsan Farkhondeh.S.B

A Kinematics Based Tolerance Analysis of Mechanisms

A kinematic based tolerance analysis of mechanisms is presented in this thesis. It is shown that standard kinematic analysis can be used for obtaining closed-form explicit formulations for tolerance analysis of mechanisms. It is proposed that the manufacturing tolerances are accounted for by incorporating fictitious sliding members in the rigid links, thereby allowing them to either grow or shrink along the lines of their pin connections. The virtual expansions or contractions of these fictitious sliders are captured in the kinematic equations by taking the differentials of the magnitudes of the vectors that define the length of rigid links having dimensional tolerances. These mathematical differentiations follow exactly the procedure of kinematic velocity analyses of mechanisms. The method can further be extended to perform tolerance analysis on a group of identical mechanisms. The tolerance analysis presented in this thesis was utilized to study tolerance accumulation in three (3) different mechanisms, slider crank, Scotch-Yoke, and a one-way clutch. In each case, the effect of tolerances in the individual components were combined together, through modified kinematic analyses, in order to determine the resulting accumulation of the tolerances in the assembly of the parts for any generalized configuration of the mechanisms. The analysis was further extended to include statistical skewness analyses on the tolerance distributions of the individual components and the resulting skewness on the assembly of the mechanism. The main benefit of the presented approach is its allowance for the use of standard kinematic computer codes for tolerance analyses of mechanism