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Lecture 2

# ENG 06 – Lecture 2 notes.docx

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University of California - Davis

Engineering

ENG 6

A H M E D R A W Y

Spring

Description

ENG 06 – Lecture #2; 1/10/2013
Sustainable Engineering Theme
Problems will involve environmental issues/sustainability
o Water supply
o Food production
o Energy production and consumption
o Waste and pollution management
o Housing and shelter
o Transportation
Ex. Solar powered electric vehicle charge station
o Addresses 3 issues: shelter, energy production, pollution management
Engineers need quantitative, detailed, rigorous methodology
o Also creativity, judgment, teamwork, tools
o Using hardware + software leads to best solutions
Problem solving approach
o Problem definition
Ex. provide electricity for a building using solar power
Not enough info
What type of generator? How much electricity?
o Engineering specification
Know what questions to ask
Transform vague problem statement into specifications
o Feasibility analysis
Preliminary calculations-is it feasible?
o Sanity check
Does it make sense? Can it be done?
o Design and verify
Can be done with software like MATLAB, hardware like
microcontrollers
o Refine and iterate
Check for issues, solve problems
Built-In Functions
Geometry
o sin(pi) % sine of pi radians
o cos(pi/2) % cosine of pi/2
o asin(1) % arcsine of 1
o sind(75) % sine of 75 degrees
Integer Functions
o round(5.3) % round towards nearest integer; ans = 5
o fix(5.3) % round towards 0; ans=5
o ceil(5.3) % round towards +inf; ans = 6
o floor(5.3) % round towards –inf; ans = 5
Algebraic
o sqrt(9) % square root of 9 o nthroot(27,3) % cube(3) root of 27
o log(5) % natural logarithm (base e) of 5
o log10(5) % log (base 10) of 5
o exp(5) % e^5
Arithmetic
o Remainder
% R = rem(X,Y) if Y~=0, returns X – n.*Y where n = fix(X./Y).
rem(15,2) % remainder of 15/2; ans = 1
rem(20,3) % ans = 2
rem(20,-3) % ans = 2
o Modulus
% M = mod(X,Y) if Y~= 0, returns X – n.*Y where n = floor(X./Y).
mod(15,2) % similar to rem but different for different signs

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