Teaching

Information related to applicable courses at the University of New Hampshire.

 


ME 643 - Machine Design

Final 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.

Group Tested Mass (g)
11 Pass (Large deflect) 13.74
10 Pass 14.44
5 Pass 16.29
4 Pass (Knock) 16.63
15 Pass (Knock) 17.67
12 Pass (Nice) 21.06
13 Pass 21.81
3 Pass 22.67
7 Pass 23.01
8 Pass 23.08
17 Pass 23.66
6 Pass 24.04
1 Pass 25.05
2 Pass 27.07
16 Pass (Twisting) 28.94
9 Pass 40.93
14 Pass (Nice but massive) 51.00

 

Videos of last years projects will be posted soon!

 


ME 795/895 - Materials Processing in Manufacturing

This is a senior undergraduate - first year graduate course, of interest for both the design and the manufacturing engineer (Syllabus). It covers the major material (metal) shaping processes in modern manufacturing and in particular (Semester schedule):

Casting: fluid flow and heat transfer, solidification, casting processes; properties of cast components and geometric capabilities.

Forming: plasticity and formability, bulk and sheet metal forming processes; properties of formed components and geometric capabilities.

Machining: cutting forces and tool wear, machining processes; properties of machined components and geometric capabilities. Overview of some non-conventional processes.

It includes labs (Lab1, Lab2) and field trips to local companies.


 


ME 777/877 - Computer-Aided Engineering

This content is under development. Visit us in the future for updated content.


 


ME 927 - Theory of Plasticity

This is a graduate-only course, that develops around 4 objectives: to familiarize students with the physics and phenomenology of plastic deformation; to develop incremental constitutive laws for numerical (e.g., finite element) plasticity analyses; to solve basic boundary value problems in solid and structural mechanics using analytical methods; and to introduce selected contemporary topics in plasticity such as crystal plasticity, nonlinear kinematic hardening and advanced anisotropic yield functions for sheet metal. Here is the link to the Syllabus.


 


ME 795/895 - Experimental Mechanics

This is a senior undergraduate - first year graduate course on traditional and modern methods in experimental stress analysis and solid mechanics. Here are links to the Syllabus and to the Semester schedule.