ENGR 1611 -- Engineering Concepts I
Fall Quarter 2004
Policies:
Professors:
Dr. Corinne Lengsfeld -
Assistant Professor of Mechanical Engineering
Office: CMK 204
Phone: x-14843
Email: clengsfe@du.eduTA's:
Graduate Teaching Assistants –
TBA
Office: TBA
Office hours: M 3-5pm; W 3-4 and 5-6pmLocation:
Lecture: CMK 309
Lab: CMK 207Grades:
Most students find that assessment (grading) is the area in which they find the most discrepancy between their expectations of the course and the reality of the course. The process used to assess all of your work is discussed below. Your grade for a work product is based on the quality of work you or your team submits. Quality work is defined as:
1) completeness
2) correctness
3) neat and a well-organized fashion and
4) submitted on time.
To help you submit quality work, for each assignment you will find a set of Checklists accompanying the homework assignment that define what is expected for your assignments.
See syllabus for complete policy details.
Lectures:
Principles of Engineering Drawing [9/14/04]
Introduction, Computer Skills and Vectors [9/16/04]
ISO Drawing Rules [9/21/04]
Levers & Pulleys [9/23/04]
Intro to CAD [9/28/04]
Wheel, Screw & Gear [9/30/04]
Feedback on Kogan#2 [10/3/04]
Water timer [10/7/04]
Introduction to Printing and making Assemblies drawings
Ideas #2 [10/12/04]
Work & Power [10/14/04]
Tolerance, Limts, Fits and Surface Finishes [10/19/04]
Internal Combustion Engines [10/21/04]
Process of Design [10/26/04]
Project Description [10/28/04]
Expectations for Design Review & Exam Review [11/2/04]
Introduction to Shop [11/4/04]
Exam [11/9/04]
Final Report Content [11/11/04]
Course evaluation [11/16/04]
Final Project:
During this laboratory exercise you will work in self-assigned teams of three people and design, build and test your mechanism. Your task is to design a trebuchet (a mechanism made of simple machines). You will write a report on this project as well as compete against your classmates.Objective:
To determine the optimal parameters for the design of a trebuchet through the use of computer
Simulation, and to construct and test a mechanical design.Introduction:
A trebuchet is an instrument of war that was used in Europe around 1500 AD. This
device is similar to a catapult, but has the capability to launch heavier payloads a greater distance than can be done using a catapult. The trebuchet uses a large counterweight, instead of a spring, to get its firing energy. The payload is attached to a rope at the end of the trebuchet opposite the counterweight. As the counter weight sinks, the payload is slung over the top of the trebuchet and launcher. The drawing below shows the general concept/arrangement for a trebuchet.Design restrictions and requirements
1) The entire deice must fit in a 4ft x 4ft x 4ft cube when in the loaded position
2) Counterweight can not exceed 30lbs.
4) The projectile will be a tennis ball.Simulation
In order to most efficiently construct the trebuchet that fires the payload a maximum distance, you need to model the trebuchet. Download the simulation file. This shareware is no longer supported and is known to work poorly in Windows environments newer than 3.X. The file is a zipped file. Download file. Double click which will unzip the file contents to a directory of your chosing. Double click on the setup.exe file. This will create a program file accessible from your start menu. Keep record of your different simulations and the resulting performance. Some parameters that you may want to vary include:
1) Location of pin
2) Location of counterweight
3) Size of the peg
4) Length of the rope
5) Location of the payloadTesting
Your are responsible for constructing your trebuchet, which will compete against your classmates. I strongly suggest you test your mechanism several times before competition. Record the results of your different tests making note of the modification you make between tests.
Last updated August 2004