indirect measuring instruments engineering problem # 2binx.mbhs.edu/~streetja/handouts/indirect...

1. Indirect Project Packet

JST HHHHHHH 9/13/10

Indirect Measuring Instruments Engineering Problem # 2 Each team of two students must fabricate an instrument or instruments, which meet the following criteria: 1 – Research and Design:

Maintain a record of design ideas, drawings and research sources used in this project. Each team will be required to fabricate a prototype of their device prior to construction, test their device, make and needed.

2 – General Instrument Characteristics: Size- Must be easily transportable to remote locations on the Blair property. Must be able to be stored in school

The instrument(s) must include all items necessary for data collection. The instrument (s) must be designed and fabricated to work independently of any other measuring device or instrument. i.e no rulers or protractors

Material – Must be fabricated in the R&E room (not home) and out of materials located in the R & E room.

Durability – Must be fabricated to be used numerous times and last the remainder of the semester.

3 – Instrument Capabilities:

Distance – Your device must be able to accurately estimate the distance of an object from the operator, with distances determined by your mathematical solution. Angles- The instrument must be able measure angles of separation of objects. Accuracy- your instrument must include a vernier scale to measure 30 minutes of a degree.

4 – Instrument Manual: Each team of students must computer generated operation manual for each instrument. (A detai led set o f operating instructions , including diagrams and math formulas necessary for re l iable data co llection .)

4 – Data Analysis:

Individual students will produce a data analysis paper from the whole class data set and write a 1-page summary of the performance of their instrument compared to the class.


JST HHHHHHH 9/13/10

Instrument Manual

Manual Assignment: Develop an instruction manual for your measurement

instrument. Print and turn in two copies, one I’ll grade and 1 for

the users to use (w/ DCS) Include:

• Title page, team members, Block and Instrument #. One

copy has the team members names, the other copy ( for

the users) has only your Block and instrument number.

• General Instrument Set up Procedure and a usage log for

each team to sign off when they used your instrument.

• Clear concise, numbered or lettered steps for data collection and recording

• Diagram of instrument with labels to identify parts.

• Variables that needed to be measured are clearly identified with a diagram that shows

variable location.

• Final math equation that shows solution for spire height. users will not need to solve the

equation

• Sample, blank, data collection sheet (DCS) for individual teams to fill out. 1 copy per team. Sample Rubric:

Owner' s Manua l Possib le Poin ts Points

Earned

Instrument set up procedure and general instructions and Log of team use: Team # date and signature line

10

Instrument diagram with labels 10

Detailed, numbered operational steps 10

Math Formulas clear and neatly organized 10

Variables needed to be measured clearly identified

Example Worksheet for data collection 5

Overall coolness and functionality of manual

5

Total 50


JST HHHHHHH 9/13/10

Instrument Rubric An apparatus for measuring Use factors:

Compactness and ease of transport

Speed and Ease of use and s ight ing User is not on the ground

Robustness i.e. WIND and STUDENT resistant Stable Angular Measurement Range Finding Accuracy and precis ion Needs a built-in Vernier scale

HHHHHHH

Data Col lect ion Worksheet Design a sheet that each team will use to collect and calculate the spire height. Include:

• Your team names and block • Place to record the Measured by Names • Diagram that shows variables to be collected • Logical sequence of formulas to plug variables into • Formula that shows s = ___ • Place to record each variable • Final answer of spire height


JST HHHHHHH 9/13/10

Name: Block: Date:

Blair Steeple Research

Research at least 2 websites and attach information you found and used to answer these questions

1. Describe the problem.

2. What information do you need to determine the height of the steeple spire?

3. How does a Range Finder work.

4. What is a Cross Staff and how is it used? 5. How did William Clark manage to measure the heights of the Falls of the Missouri with

such precision that he could say one was "26 feet 5 inches," another "14 feet 7 inches?


JST HHHHHHH 9/13/10

Name: Block: Date:

Instrument Concept Sketch

6. Sketch a concept design of your instrument on the grid below. Provide a scale that describes each

square size, overall sizes of the instrument, material and construction notes along with the type of

instrument.


JST HHHHHHH 9/13/10

Indirect Instrument Cal ibrat ion

1. Initial height measurement of the light pole with your indirect measurement device.

2. What is the % error comparing measured height to the median height from light pole data

of 7.6m?

3. Calculate the angle from A to the top of the light pole?

If you need to account for the instrument height, what do you need to do?

4. Measure the angle from the 15m arc to the top of the light pole, using your instrument.

5. Angle variation between expected and measured?

6. Measured spire height:

7. What is the difference between accuracy and precision? How would you describe your

device?

8. What are some limitations of your measurement device and methods?

Name: Name: Block: Instrument #:

15 meters

7.7 meters

(Measured Value - True Value) Percent Error = x 100% True Value


JST HHHHHHH 9/13/10

Block: Date:

Name:

Name:

Draw a top, front and right side view of your proposed instrument Use pencil and be sure views line up. Draw with straight edges Dimension individual elements and overall sizes

Instrument Multi-view aaaaaaaaaa

TOP

FRONT

R SIDE

Team #


JST HHHHHHH 9/13/10

Block: Date:

Name:

Name:

Measurement Solution

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1st Floor plan (Top View)

Darn Moat

Projected line of steeple from top view. Draw steeple here…

GROUND LEVEL (Or is it?)

Team #

Illustrate proposed measurement locations Indicate where which instrument type is used Show required data needed and mathematical solution. Solve for spire height h= _____ Note: The edge of the moat will be farther away from the building than the overall height of the steeple

indirect measuring instruments engineering problem # 2binx.mbhs.edu/~streetja/handouts/indirect...

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