Question Description

I’m working on a mechanical engineering project and need a sample draft to help me learn.

Hello,

I need a lab manual for a topic from the mentioned topics in the assignment description, please follow the guidelines and write everything according to the rubric. Please choose the topic that you think would be suitable for you. Attached are both the description and a sample lab manual from class. please include equations, tables, and everything needed. Thanks

EML 3303 Ã¢â‚¬â€œ Term Project

Goal

Design a brief lab session (similar to the ones you have taken throughout this course) and write

the lab manual. The project is to be completed in groups, same groups as in labs. You will

submit one thing:

a) A written document (pdf) in the form of a lab manual: no more than 5-6 pages

approximately.

Due date

Friday, December 3rd by midnight (11:59PM) 2021.

What to do:

Think of a physical variable/material property that is typically measured in mechanical

engineering and design a brief laboratory session that shows how to conduct measurement(s)

for such variable.

IMPORTANT: you cannot choose a physical variable that can be directly measured with an

instrument. It has to be an indirect measurement. For example, you cannot choose mass as the

physical variable since a scale can directly provide that measurement. Instead you could choose

density and measure mass and volume in order to find density.

Once you pick a physical variable/material property you will:

– Choose real measuring devices/instruments/sensors to carry out the measurement you

picked.

– Explain how the measuring devices/instruments/sensors work.

– Describe in detail step by step how to use the measuring devices/instruments/sensors to

eventually obtain the desired measurement.

Written document structure

The written document you submit should have the following sections:

Cover page: Project title, Authors names.

1 – Introduction: goal of the lab session and context for the measurement. Relate it to real

applications. Where does this measurement occur? Who uses it? What is it used for? Why is it

important?

2 – Theory: here you will present the measuring devices/instruments/sensors needed to

conduct your measurement and the fundamental principles behind such devices. Choose real

existing measuring devices/instruments/sensors and provide the manufacturer/seller and

model numbers. Also, you will include any equations required for your measurement and

explain them briefly and clearly.

3 – Procedure: explain in full detail, step by step, how to use the measuring

devices/instruments/sensors to conduct your measurement. Use a bulleted list for the

procedure.

4 – Uncertainty: list the sources of uncertainty for the measuring devices/instruments/sensors

you decided to use and provide the formulas to be used to calculate the uncertainty of the

physical variable/material property you chose for this project. You are not required to use

numerical values, although you may choose some hypothetical ones if you would like.

Ideas (here are some ideas that you can borrow or you can come up with your own)

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Measuring the drag coefficient of spherical objects.

Measuring the flow coefficient (Ko) of a differential pressure flow meter.

Measuring the YoungÃ¢â‚¬â„¢s Modulus of a metal.

Measuring material hardness with the Vickers and Brinell methods.

Measuring distance with optical techniques.

Measuring sound wave attenuation through a solid material.

Measuring the thermal conductivity of a material.

Measuring the specific heat of a material.

Measuring the density of an ideal gas.

Measuring solar irradiance on a flat surface.

Measuring the PoissonÃ¢â‚¬â„¢s ratio of a solid material.

Measuring the resistivity of a material.

Measuring the electrical conductivity of a metal.

Measuring corrosion.

Measuring surface tension in a liquid.

Measuring the Seebeck coefficient of a thermoelectric material.

Measuring the Shear Modulus.

Measuring material toughness.

Measuring the thermal expansion coefficient of a metal.

Measuring fracture toughness against surface cracks.

Measuring magnetic permeability.

Measuring the speed of sound in liquids with ultrasonic transducers.

Lab 2

Pneumatic Cylinder

Objective

Introduction to:

Ã¢â‚¬Â¢ Pneumatic Cylinders

Ã¢â‚¬Â¢ Propagation of Uncertainty

Introduction

A pneumatic cylinder converts energy stored in a pressurized gas into mechanical work. The high

pressure air exerts a large force on one side of the piston and the low pressure air exerts a smaller

force on the other side of the piston, resulting in a net force given by equation 1a (pressures are

gage pressure, not absolute pressure). This force causes the piston (and the attached rod) to extend

or retract, depending on the direction of the net force. If the low pressure side is at atmospheric

pressure, then equation 1a becomes 1b, which is the case in this lab.

Ã°Ââ€˜Â = Ã°Ââ€˜Â·Ã°Ââ€™â€žÃ°Ââ€™â€šÃ°Ââ€™â€˜ Ã¢Ë†â€” Ã°Ââ€˜Â¨Ã°Ââ€™â€žÃ°Ââ€™â€šÃ°Ââ€™â€˜ Ã¢Ë†â€™ Ã°Ââ€˜Â·Ã°Ââ€™â€œÃ°Ââ€™ÂÃ°Ââ€™â€¦ Ã¢Ë†â€” Ã°Ââ€˜Â¨Ã°Ââ€™â€œÃ°Ââ€™ÂÃ°Ââ€™â€¦

Ã°Ââ€˜Â=Ã°Ââ€˜Â·Ã¢Ë†â€”Ã°Ââ€˜Â¨

(1a)

(1b)

The terminology used in pneumatic cylinders refers to the larger area (left side of the piston in

figure 1) as the Ã¢â‚¬Å“capÃ¢â‚¬Â side of the piston and the smaller piston area (right side of the piston in figure

1) as the Ã¢â‚¬Å“rodÃ¢â‚¬Â side of the piston. Notice that the rod side area is smaller than the cap side area.

Also, note that Arod in this case does not refer to the area of the rod, but rather, the area of the rod

side of the piston. Figure 1 depicts the anatomy of a typical pneumatic cylinder. These devices

are also known as linear actuators because they produce linear motion.

Figure 1: Anatomy of a typical air cylinder

The advantages of using a pneumatic cylinder:

Ã¢â‚¬Â¢ Air cylinders are relatively quiet in operation

Ã¢â‚¬Â¢ Air cylinders are clean Ã¢â‚¬â€œ there is no hazardous fluid that can leak into the surroundings

Ã¢â‚¬Â¢ Initial cost is low

The disadvantages of using a pneumatic cylinder:

Ã¢â‚¬Â¢ Can lack precision if the load on the cylinder is compressing the gas as the cylinder actuates

(i.e. extending or retracting in vertical position)

Ã¢â‚¬Â¢ Relatively poor speed control

Ã¢â‚¬Â¢ The long term cost of the increased energy required run the air compressor

Single-acting cylinders (SAC) – Air cylinders which have only one air supply to push the piston

only one way. A SAC type air cylinder usually has an internal compression spring resetting the

piston after actuation.

Double-acting cylinders (DAC) – Air cylinders that have air supply ports on both ends. This type

of air cylinder is more controllable (position and speed) by controlling the differential pressure on

both air supply ports.

One-sided cylinder Ã¢â‚¬â€œ A cylinder with a rod extending out in only one direction. This is what is

being used in this lab.

Two-sided cylinder Ã¢â‚¬â€œ A cylinder with a rod extending out of each side. Typically the rod diameter

is equal on both sides, resulting in simplified analysis because both sides of the piston will have

the same area.

Bore Ã¢â‚¬â€œ Refers to the diameter of the cylinder barrel in which the piston travels. This dimension

will be used to calculate the piston area.

Position Sensors (Switches) Ã¢â‚¬â€œ The cylinderÃ¢â‚¬â„¢s speed and position can be controlled by having a

magnetized piston traveling inside the cylinder barrel. The position of the magnetized barrel can

be sensed by position sensors (switches) attached to the outside of the cylinder barrel via the Hall

effect.

Tools and Material

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1 Air cylinder setup with two On/Off switches

1 Air regulator/filter

1 Dissected air cylinder (one per class)

1 load scale (aka. fish scale)

1 Vernier caliper

Procedure

1. Make sure that all laboratory tools are present and properly working.

2. With a caliper, measure the inside diameter of the provided pneumatic cylinder. A

dissected air cylinder will be provided so that the inside diameter is accessible. Each

member of the group should perform this measurement twice. Record your measurements

in the table provided in the back of this laboratory.

3. With a caliper, measure the diameter of the air cylinder rod. Each member of the group

should perform this measurement twice. Record your measurements in the table provided

in the back of this laboratory.

4. Familiarize yourselves with the set-up, valves, pressure regulator, and gages. Be sure you

know which direction to turn the valve switches (A and B) to turn supply air pressure on

and off.

Caution: While under pressure the cylinder can snap quickly and cause minor injuries

so take caution when switching air supply switches!

5. Record the force exerted by the extending air cylinder at approximately 40 psi. Without

adjusting the regulator, record the force exerted by the retracting air cylinder at the same

pressure. Carefully monitor regulator readings and allow it to settle to steady state before

recording the data.

6. Repeat step 5 for each pressure setting required. The pressure should range from

approximately 5 psi up to 40 psi. It is important that you leave the pressure regulator setting

unchanged while measuring the extension and retraction force because it would be difficult

to achieve the identical pressure after adjusting the regulator.

Calculations

1. Plot cylinder performance (do in lab)

Compare the extending and retracting forces, that is, compare measured forces to the forces

calculated (theoretical) from your area and pressure measurements. For each force

direction (extension and retraction), plot graphs with force on the vertical axis and pressure

on the horizontal axis, clearly indicating units. Make sure your data looks reasonable.

2. Find the uncertainty in the cylinder extension force measurement (do in lab)

From your caliper measurements, estimate the error in surface area. Also estimate the error

in pressure from your experience in setting the pressure at the regulator. Finally, use

Equation 1b with equation 2, 3, and 4 to estimate the error in your force calculation. Be

sure to check your units, whether you use English or SI units.

The uncertainty of the extending or retracting cylinder force, can be found with Equation

2. This provides the Ã¢â‚¬Ëœmost likely errorÃ¢â‚¬â„¢.

4

1.

1.

Ã°Ââ€˜Â¢. = /012 Ã°Ââ€˜Â¢2 3 + 016 Ã°Ââ€˜Â¢6 3

1.

12

= Ã°ÂÂÂ´ and

1.

16

4

(2)

=Ã°Ââ€˜Æ’

(3),(4)

Substituting Equations 1, 3, and 4 into Equation 2 and rearranging gives Equation 5.

9:

.

4

9

9

= /0 2;3 + 0 6? = Ã°ÂÅ“â€¹Ã°Ââ€˜â€˜ 4 /4

(For Extension Only)

(6)

Applying the same method used to get Equation 5, we get the uncertainty in the area to be

16

4

Ã°Ââ€˜Â¢6 = /01E Ã°Ââ€˜Â¢E 3 = /02

GE

H

4

Ã°Ââ€˜Â¢E 3 = 2

GE

H

|Ã°Ââ€˜Â¢E |

(7)

Ã°Ââ€˜Â¢E is the uncertainty of the cylinder inner diameter. This Ã°Ââ€˜Â¢6 can then be used to solve for

Ã°Ââ€˜Â¢. (Equation 5). These equations are for the extension when the pressure acts on the entire

area.

Looking at equation 5, you can see that the uncertainty will change depending on the value

of F and P, so your uncertainty will be different for each measurement – calculate the

uncertainty of the calculated force for each pressure on extension mode only.

Check to see if the measured force is within the bounds of uncertainty of the calculated

force. If not, what do you think could account for the differences?

3. Uncertainty on retraction force

The equations change for retraction when the area of the rod must be subtracted. Derive

the equations needed to find the uncertainty on the retraction force and present them in the

appendix. No numerical values required.

Lab Report

This report is to be completed in groups (one printed report per group). The report should also

include the following graphs as part of the results:

1. One scatter plot of the measured force for extension and retraction VS air supply pressure

(2 sets of points on plot)

2. One scatter plot of the calculated force for extension and retraction VS air supply pressure

(2 sets of points on plot)

3. One scatter plot of the measured force for extension and the calculated force Ã‚Â± Force

Uncertainty (Ã°Ââ€˜Â¢. ) VS air supply pressure. (two lines, one with Error bars)

Figure 2 presents a general sample plot formatted properly in Microsoft Excel.

Pneumatic Cylinder Extension Force vs. Supply

Pressure

Force (lbs)

150

100

Measured force

50

Calculated force

0

0

20

40

Pressure (psi)

60

Figure 2: Example of cylinder extension vs supply pressure plot created in Microsoft Excel.

As always, normal formatting rules for any graphs and tables apply (axis labels, caption, table title,

etc). Remember to still include tables with the calculated values. Include a discussion of

observations and trends for each graph and discuss what would need to be done to reduce the error

in the force measurement and calculation.

Review the lab report formatting requirements and pay attention. They are not suggestions. Upon

reading your lab report, if it becomes clear that you have not read the lab report guidelines or made

a reasonable effort to adhere to them, you will receive a zero on your lab report with no opportunity

to resubmit and with no detailed feedback.

Data Sheet

Pressure

Regulator

Setting

(_____)*

Cylinder

Extension

Force

(______)*

Cylinder

Retraction

Force

(______)*

*Record units used

Cylinder Inside Diameter

(_______)*

Lab

Partner

Measurement 1

Measurement 2

Cylinder Rod Diameter

(_______)*

Measurement 1

1

2

3

4

*Record units used

Measurement 2

Appendix:

Why do we use gage pressure instead of absolute pressure in the above analysis?

The absolute pressure ultimately is what determines the force. Consider all the forces acting on

the piston-rod assembly in the direction of motion:

1) the absolute pressure in the cap side acting on the cap side area

2) the absolute pressure in the rod side acting on the rod side area

3) the absolute pressure (atmospheric) acting on the tip of the rod

4) friction between the cylinder wall and the piston.

Conveniently, the friction force goes to zero as the piston velocity goes to zero, leaving the other

3 forces. The resulting force is given below

Ã°ÂÂÂ¹ = (Ã°Ââ€˜Æ’L,=>? + Ã°Ââ€˜Æ’>NOPQ?RSTU= )Ã°ÂÂÂ´=>? Ã¢Ë†â€™ (Ã°Ââ€˜Æ’L,TPW + Ã°Ââ€˜Æ’>NOPQ?RSTU= )Ã°ÂÂÂ´TPW Ã¢Ë†â€™ Ã°Ââ€˜Æ’>NOPQ?RSTU= Ã¢Ë†â€” Ã°ÂÂÂ´TPW NU?

But notice that Ã°ÂÂÂ´=>? = Ã°ÂÂÂ´TPW + Ã°ÂÂÂ´TPW NU? so that the above equation simplifies as follows:

Ã°ÂÂÂ¹ = Ã°Ââ€˜Æ’L,=>? Ã°ÂÂÂ´=>? + Ã°Ââ€˜Æ’>NOPQ?RSTU= Ã°ÂÂÂ´=>? Ã¢Ë†â€™ Ã°Ââ€˜Æ’L,TPW Ã°ÂÂÂ´TPW Ã¢Ë†â€™ Ã°Ââ€˜Æ’>NOPQ?RSTU= Ã°ÂÂÂ´TPW Ã¢Ë†â€™ Ã°Ââ€˜Æ’>NOPQ?RSTU= Ã¢Ë†â€” Ã°ÂÂÂ´TPW NU?

Ã°ÂÂÂ¹ = Ã°Ââ€˜Æ’L,=>? Ã°ÂÂÂ´=>? + Ã°Ââ€˜Æ’>NOPQ?RSTU= Ã°ÂÂÂ´=>? Ã¢Ë†â€™ Ã°Ââ€˜Æ’L,TPW Ã°ÂÂÂ´TPW Ã¢Ë†â€™ Ã°Ââ€˜Æ’>NOPQ?RSTU= (Ã°ÂÂÂ´TPW + Ã°ÂÂÂ´TPW NU? )

Ã°ÂÂÂ¹ = Ã°Ââ€˜Æ’L,=>? Ã°ÂÂÂ´=>? + Ã°Ââ€˜Æ’>NOPQ?RSTU= Ã°ÂÂÂ´=>? Ã¢Ë†â€™ Ã°Ââ€˜Æ’L,TPW Ã°ÂÂÂ´TPW Ã¢Ë†â€™ Ã°Ââ€˜Æ’>NOPQ?RSTU= (Ã°ÂÂÂ´=>? )

Ã°ÂÂÂ¹ = Ã°Ââ€˜Æ’L,=>? Ã°ÂÂÂ´=>? Ã¢Ë†â€™ Ã°Ââ€˜Æ’L,TPW Ã°ÂÂÂ´TPW

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