college of ngineering engr - charles w. davidson college ... · san jose state university engr.10...

Engineering College of

San Jose State University

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JKA & KY



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Engineering Analysis

• Engineering analysis is a systematic process for analyzing

problems that arise in the various fields of engineering.

• As part of the problem solving process, the data collected

has to be processed, analyzed and sometimes displayed

graphically by using many mathematical tools that are

available.

• In many cases, once you have defined and set up the problem

properly, numerical methods are required to solve the

mathematical equations.

Microsoft’s Excel spreadsheet software has many numerical

procedures built directly into its program structure.



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Spreadsheets’ Capabilities

• Store, process, and sorts data

• Graphically display data (Engineering application)

• Perform statistical analysis

• Fit equations to curves (Engineering application)

• Solve single and system of algebraic equations (Engr. Appl.)

• Solve optimization problems (Engineering application)

• Draw Flow Charts

Data Analysis Tools



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Ken Youssefi PDM I, SJSU

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Material Strength

Standard Tensile Test Standard Specimen

σ (stress) = Load / Area

ε (strain) = (change in length) / (original length)

Ductile Steel (low carbon)

Sy – yield strength

Su – fracture strength



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currently active

cell (A1)

menu bar

formula bar

worksheet tabs

File management

options



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Entering Data into Cells (Cell Content)



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Copying Cells

“Fill Down” : select the cell containing the active formula and

the range of cells you need to fill

select “Fill” on the Home menu and choose “Down”

1. Using icons in the ribbon menu a) Click on the Cells to be copied

b) Select “Copy” on the Home toolbar

c) Click on the Cells to paste the copied contents

d) Select “Paste” or “Special Paste” on the Home toolbar

2. Using keyboard - Ctrl C to copy & Ctrl V to paste

3. “Pull Down corner” at Lower Right Corner (recommended for a range of cells)

a) place the cursor on the LRC of the active cell

b) Click and drag over the cell rage



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Relative Addressing

1. =B3+C3 adds the content of cells B3 and C3.

A B C D E

1

2 internal equation

3 2 3 =B3+C3

4 5 1 =B4+C4

5 10 4 =B5+C5

6 15 5 =B6+C6

7 SUM: 34 15 =SUM(D3:D6)

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A B C D E

1

2 Result

3 2 3 5

4 5 1 6

5 10 4 14

6 15 5 20

7 SUM: 32 13 45

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2. As the formula is copied into D4, D5 and D6,

cell addresses of the formula are incremented.



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Absolute Addressing

A B C D E

1 k= 0.5

2 Result

3 2 3 5.5

4 5 1 6.5

5 10 4 14.5

6 15 5 20.5

7 SUM: 32 13 47

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• Using the absolute cell address, $B$1, will

keep the cell reference constant for all

calculations.

A B C D E

1 k= 0.5

2 internal equation

3 2 3 =B3+C3+$B$1

4 5 1 =B4+C4+$B$1

5 10 4 =B5+C5+$B$1

6 15 5 =B6+C6+$B$1

7 SUM: 34 15 =SUM(D3:D6)

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Basic Math Operations

Operation Algebraic Excel Format

add a+b a+b

subtract a-b a-b

multiply ab, axb, a.b a*b

divide a/b a/b

exponential an a^n

number

format

5.07x10 +12 5.07E12

5.07*10^12

3.15x10 -3 3.15E-3

3.15*10^(-3)



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Excel Formulas • In Excel, a formula expresses dependency of one cell on

others in the worksheet.

• Formula entry for a Cell begins with clicking on the Cell first

and then either typing the equal sign “=“ in the Cell itself or

clicking on the Formula Bar, and ends with “Enter”.

• A Formula can be edited by first clicking on the Cell and then

editing the formula on the active Cell or on the Formula Bar.

• A Formula may contain functions.

The value of x is in cell A15

Example

Math syntax: 3x2 + e(-0.3x) - 10x

=3*(A15^2) + EXP(-0.3*A15) - 10*A15 Excel syntax:



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Using Excel Built-in Functions

After clicking on the Cell

• Click on the “Formula Bar” (fx), follow instructions on the “Insert Function” window. Or, in the “Formulas” menu select “Insert Function“

• Follow instructions on the “Function Argument” window, e.g., select the value, or range of values for the function.



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Frequently Used Excel Functions

Math Excel Syntax Purpose: Returns the: (Assume value of x

is in cell A15.)

π PI() value of π (3.141593…)

ex EXP(A15) Value of ex where e is the base of

Natural Log

√ x SQRT(A15) Value of the square root of x

log10 (x) LOG10(A15) Logarithm of x, with base 10

ln(x) LN(A15) Natural logarithm of x, with base e

SUM(x1,x2,x3) SUM( A15:A17) x1+x2+x3

cos(x) COS(A15) Cosine of x

sin(x) SIN(A15) Sine of x

tan(x) TAN(A15) Tangent of x

Average(x1,x2,x3) AVERAGE(A15:A17) (x1+x2+x3)/3



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Example: “My Expense Table”



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“My Expense Table”- Aug. Expense

=SUM(B5:B10)



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“My Expense Table”- Aug. Expense (cont.)



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“Eliminating Repetition”

Place cursor in the lower right corner of cell

B11, “click-and-drug” along row 11 for the rest

of the total of the rest of the months

Repeat procedure for the

“Total” of each category



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“My Expense Table” - Completed



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Insert menu

Plotting Data

2007 version

2013 version



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Data menu

2007 version

2013 version



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View menu

2007 version

2013 version



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MAX and MIN Functions

• =MAX or MIN(X1, X2, X3…) will take the maximum or

minimum of the numbers in the parentheses.

• =MAX or MIN(X1:X4) will take the maximum or minimum

of all the numbers from X1 to X4.

COUNT Function

• =COUNT(X1, X2, X3…) will count the number of

cells that contain numbers and the arguments in

the list that are numbers.

=COUNT(A1, A2, A3) will return 2, because of the 4 and 9.

=COUNT(A1:A4) will return 3, because of the 4, 9 and 3.

=COUNT(A1:A4, -17, “world”) will return 4, because of the 4, 9, 3 and -17.

Example



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COUNTIF Function

• =COUNTIF(range, criteria) will count the number of cells

in the range that match the criteria.

Note: if the criteria consists of a relational expression,

such as “>5”, it must be enclosed in double quotes.

=COUNTIF(A1:A4, “>5”) will return 2,

because 6 and 9 are greater than 5.

=COUNTIF(A1:B4, “=6”) will return 3,

because three cells in the range

contain 6.

Example



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IF Logical Function

• =IF(logical_test, value_if_true, value_if_false) returns the

second argument if the test is true, and the third if it is false.

=IF(A1>3, “A1 is larger than 3”, 0) would

return “A1 is larger than 3”.

=IF(A4>3, “A1 is larger than 3”, 0) would

return 0.

Example



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VLOOKUP or HLOOKUP Function

• =VLOOKUP(lookup_value, table_array, col_index_number,

not_exact_match) finds the value in the top row of a table

and returns the corresponding column value.

Not_exact_match: Can be either True or False.

True means it will find the closest value to the

lookup value. False means you only want the value

returned if it is an exact match.

Table_array: The table that the function looks through.

Col_index_number: The column number from which

the function should return (search for) the value.

Lookup_value: The value that the function looks

for in the first column.

Vertical search Horizontal search



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Question: find the price

for item with ID# 12

VLOOKUP Function - Example

=VLOOKUP(12, Q50:S53 ,2, FALSE)

=VLOOKUP(lookup_value, table_array, col_index_number,

not_exact_match)

Q S R

50

51

53

52

Answer = 14.33



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HLOOKUP Function - Example

=HLOOKUP (12, A1:E3, 2, False) means that you are looking in the second

row for the value corresponding to the value 12 in top row, and you are

looking for an exact match to 12. This would return $14.33.

=HLOOKUP (10, A1:E3, 2, False) means that you are looking in the second

row for the value corresponding to the value 10, and you are looking for an

exact match to 10. Since there is no 10 in top row, it would return #N/A.

=HLOOKUP (50, A1:E3, 3, True) means that you are looking in the third row

for the value corresponding to the value 50 in top row. Since there is no 50

in the top row, it returns the match corresponding to the largest value in the

top row that is less than the lookup value of 50. In this case, it returns 8.

If range lookup is TRUE, the values in the first row of table array must be placed in ascending order: ...-2, -1, 0, 1,

2,... , A-Z, FALSE, TRUE; otherwise, HLOOKUP may not give the correct value. If range lookup is FALSE, table

array does not need to be sorted.

Row 1 is not

in ascending

order

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