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Course : Machine Elements Design

Course Number
MENG 4134
Section Number
101
Semester
Fall 2021
Location
McCoy Engineering Hall, MY 136
Days & Times
Final Exam Day/Time
Wednesday, December 08, 2021 8:00 am - 10:00 am

Topics

Load and Stress Analysis
Mohr’s Circles
Failure theories
Shocks and Impacts
Shafts
Welding
Power Screws
Mechanical Springs 
Gears, Spur and Helical Gears, Bevel and Worm Gears
Rolling-Contact Bearings, Lubrication and Journal Bearing
Belts
Finite-Elements Analysis
Power Transmission
 

The students are expected to master these learning objectives:

  • Explain the method of sections for beams
  • Describe the most important failure theories for ductile and brittle materials
  • Develop all the steps of the shaft design for stresses method
  • Name two major applications of power screws. Explain their mechanics
  • Calculate the average shear stress in a butt and fillet welds
  • Estimate the torsional yield strength of a helical compression spring wire
  • Calculate a bearing load life at rated reliability
  • Derive the Petroff’s equation for bearing friction and define the sommerfeld number
  • Determine shaft and bearing loads for spur and bevel gears
  • Derive the Lewis equation for estimating the bending stress in gear teeth
  • Define the flywheel coefficients of speed fluctuation and inertia
  • Estimate the centrifugal tension and torque experienced by a transmitting power flat belt
  • Use, explain and apply the Finite Element Method for stress analysis in mechanical parts
  • Write formal and informal engineering reports
  • Work as part of a team

 

COURSE PRE-REQUISITES

 MENG 3233 Mechanisms & Dynamics of Machines.

OTHER PREREQUISITES

Basic computer skills, SolidWorks, SolidWorks Simulations, MS Excel, hand calculator

Lecture Format

This fall 2020 semester, the fluid mechanics lecture is designed as a hybrid lecture. It means that the lecture is offered simultaneously in two forms: 1) in person lecture (face-to face) in the classroom at the McCoy School of Engineering, and 2) online lecture through Zoom, the web-based video conferencing and meeting application. The lecture consists of a three 50-minutes sessions. The lectures will be spent mostly explaining and discussing concepts presented in the textbook, and solving relevant case problems. The Lectures will not be used to communicate the entire textbook course content and thus, students will have to study a set of course paragraphs specified by the instructor on their own to further their understanding. Student participation in class discussions is highly recommended and rewarded. Due to the COVID-19 pandemic, students who choose to attend the in-person lecture are expressly required to wear a face mask covering the mouth and the upper nose all the time during the lecture. Students are also required to keep their social distancing (6 ft.) while sitting in the class. Please check the following university statement:
 
“During class, students must comply with MSU’s requirement for wearing a face covering” as mandated in the document https://msutexas.edu/return-to-campus/_assets/files/msu-texas-facial-covering-requirement.pdf

Exams

There will be two regular exams plus a final one at the end of the semester. Each exam will have a set of textbook theoretical questions designed to test the students’ ability to acquire a self-reading knowledge of the taught materials. The exam has also a set of practical questions designed to test the students’ ability to think, analyze, and solve particular engineering problems. Each exam is based on the course materials developed before the first exam or between two consecutive exams. Due to COVID-19 pandemic, all assigned exams will be take home exams. The exams will be posted on D2L on the agreed scheduled dates. Each exam copy has to be uploaded digitally to a D2L Dropbox by the student as one single PDF or Microsoft Word file within a maximum of 24 hours of the exam posting date. The solutions of the exam should be written on engineering paper or blank sheets, organized with the appropriate questions numbering, and neatly written. After 24 hours the D2L Dropbox will be closed and not visible to the students. You are expected to take the exam on the scheduled date and time it is given. No make-up exam will be given at any time during the semester.

Homework & Quizzes

Homework will be posted on D2L from a set of chosen chapters by the instructor. The students are required to upload the homework to a D2L Dropbox in PDF or Microsoft Word format. The solutions of the homework should be written using the posted homework template, organized with the appropriate questions numbering, and neatly written. Homework solutions should be submitted with the posted homework questions sheet as a cover page for the whole homework submission. Homework have to be turned in on the due date specified on the homework question sheet. The maximum grade for the submitted homework on the due date is 50%. Late homework will still be accepted till the end of the semester and graded with a maximum grade of 30%. There will be a D2L quiz given for each homework to encourage the students to study the course materials and do the homework by themselves. Quizzes will consist of questions related to those treated in the current homework problems, but not exactly the same. You are expected to take the quizzes on the scheduled dates and times specified by the instructor. No make-up quiz will be given at any time during the semester. Quizzes count for 50% of the homework total grade and should be uploaded to a D2L Dropbox within 24 hours of the quiz posted date. Each student is responsible for submitting his own individual personal homework and quiz copy, written in his own words. No dual or group homework copy is accepted unless specified by the instructor.

Lab Reports

Beside the weekly three hours lectures, two hours will be dedicated to lab experiments, result analysis, and lab reports. Lab reports are based on the materials studied in class, or presented during lab sessions. Organized, neat Lab reports must be turned in on the due date, at the beginning of class. Each group of students is responsible for submitting his own lab report in his own words. A student cannot add his name to a student lab group if absent. Labs are graded according to the content listed in the below table. Students are encouraged to finish their lab and submit it during the lab session if possible. 
 
Arriving late to the lab will be penalized by -5 points on the lab grade. Quitting the lab session without the instructor authorization will be penalized by -10 points on the lab grade. For lab guidelines, contents, grading, and scheduling during the COVID-19 pandemic, the students are referred to the labs instructor: Dr. Pranaya Pokharel.
 

Course Grade

The final grade for the course will be based on the scores earned in the three mandatory exams, the average score earned in the quizzes and homework, the average score earned in lab reports, and the attitude grade. The first exam contributes 10%, the second exam contributes 20%, the third exam contributes 35%, quizzes and homework average contribute 10%, lab reports average contributes 15%, and participation, neatness, attitude, and class attendance contribute 10%, for a total of 100%. The overall average score (X) for the course is determined as follows:

X = 0.10 x exam1 score + 0.20 x exam 2 score + 0.35 x Comprehensive exam score + 0.10 x (quizzes average score + homework average score) + 0.15 x (lab report average score) + 0.10 x (participation/neatness/attitude/attendance scores/ethics).

The final letter grade for the course is based on the value of X and is determined from the following grade levels:

Value of X (in %)

Letter Grade

89.5-100

A

79.5-89.4

B

69.5-79.4

C

59.5-69.4

D

< 59.4

F

 

Lab Grading

Submitted/Behavior

10

9.5

9

8.5

8

7.5

7

6.5

6

5.5

5

4.5

4

3.5

3

2.5

2

1.5

1

0.5

0

Motivation

10

9.5

9

8.5

8

7.5

7

6.5

6

5.5

5

4.5

4

3.5

3

2.5

2

1.5

1

0.5

0

Lab Theory

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

Lab Procedure

10

9.5

9

8.5

8

7.5

7

6.5

6

5.5

5

4.5

4

3.5

3

2.5

2

1.5

1

0.5

0

Results and Discussion

30

28

26

24

22

20

18

16

14

12

10

9

8

7

6

5

4

3

2

1

0

Conclusion

10

9.5

9

8.5

8

7.5

7

6.5

6

5.5

5

4.5

4

3.5

3

2.5

2

1.5

1

0.5

0

Ref./Org./Neatness

10

9.5

9

8.5

8

7.5

7

6.5

6

5.5

5

4.5

4

3.5

3

2.5

2

1.5

1

0.5

0

 

 

 

Class Attendance

This fall 2020 semester, the machine elements design lecture is designed as a hybrid lecture. It means that the lecture is offered simultaneously in two forms: 1) in person lecture (face-to face) in the classroom at the McCoy School of Engineering, and 2) online lecture through Zoom, the web-based video conferencing and meeting application. The lecture consists of a three 50-minutes sessions. Due to the COVID-19 pandemic, students who choose to attend the in-person lecture are expressly required to wear a face mask covering the mouth and the upper nose all the time during the lecture. Students are also required to keep their social distancing (6 ft.) while sitting in the class. Please check the following university statement:
 
“During class, students must comply with MSU’s requirement for wearing a face covering” as mandated in the document https://msutexas.edu/return-to-campus/_assets/files/msu-texas-facial-covering-requirement.pdf
 

Exams

The exams should be uploaded by the students on the Dropbox of D2L. After 24 hours the D2L Dropbox will be closed and not visible to the students. You are expected to take the exam on the scheduled date and time it is given. No make-up exam will be given at any time during the semester.

Homework & Quizzes

Homework will be posted on D2L from a set of chosen chapters by the instructor. The students are required to upload the homework to a D2L Dropbox in PDF or Microsoft Word format. Homework have to be turned in on the due date specified on the homework question sheet. The maximum grade for the submitted homework on the due date is 50%. Late homework will still be accepted till the end of the semester and graded with a maximum grade of 30%.
 
There will be a D2L quiz given for each homework. You are expected to take the quizzes on the scheduled dates and times specified by the instructor. No make-up quiz will be given at any time during the semester. Quizzes count for 50% of the homework total grade and should be uploaded to a D2L Dropbox within 24 hours of the quiz posted date.
 
Each student is responsible for submitting his own individual personal homework and quiz copy, written in his own words. No dual or group homework copy is accepted unless specified by the instructor.

Lab Reports

Students are encouraged to finish their lab and submit it during the lab session if possible. 
 
Arriving late to the lab will be penalized by -5 points on the lab grade. Quitting the lab session without the instructor authorization will be penalized by -10 points on the lab grade. For lab guidelines, contents, grading, and scheduling during the COVID-19 pandemic, the students are referred to the labs instructor: Dr. Pranaya Pokharel.
 

Note: You may not submit a paper for a grade in this class that already has been (or will be) submitted for a grade in another course, unless you obtain the explicit written permission of me and the other instructor involved in advance.

Plagiarism is the use of someone else's thoughts, words, ideas, or lines of argument in your own work without appropriate documentation (a parenthetical citation at the end and a listing in "Works Cited")-whether you use that material in a quote, paraphrase, or summary. It is a theft of intellectual property and will not be tolerated, whether intentional or not.

Student Honor Creed

As an MSU Student, I pledge not to lie, cheat, steal, or help anyone else do so."

As students at MSU, we recognize that any great society must be composed of empowered, responsible citizens. We also recognize universities play an important role in helping mold these responsible citizens. We believe students themselves play an important part in developing responsible citizenship by maintaining a community where integrity and honorable character are the norm, not the exception.

Thus, We, the Students of Midwestern State University, resolve to uphold the honor of the University by affirming our commitment to complete academic honesty. We resolve not only to be honest but also to hold our peers accountable for complete honesty in all university matters.

We consider it dishonest to ask for, give, or receive help in examinations or quizzes, to use any unauthorized material in examinations, or to present, as one's own, work or ideas which are not entirely one's own. We recognize that any instructor has the right to expect that all student work is honest, original work. We accept and acknowledge that responsibility for lying, cheating, stealing, plagiarism, and other forms of academic dishonesty fundamentally rests within each individual student.

We expect of ourselves academic integrity, personal professionalism, and ethical character. We appreciate steps taken by University officials to protect the honor of the University against any who would disgrace the MSU student body by violating the spirit of this creed.

Written and adopted by the 2002-2003 MSU Student Senate.

The Americans with Disabilities Act (ADA) is a federal anti-discrimination statute that provides comprehensive civil rights protection for persons with disabilities. Among other things, this legislation requires that all students with disabilities be guaranteed a learning environment that provides for reasonable accommodation of their disabilities. If you believe you have a disability requiring an accommodation, please contact the Disability Support Services in Room 168 of the Clark Student Center, (940) 397-4140.

The professor considers this classroom to be a place where you will be treated with respect as a human being - regardless of gender, race, ethnicity, national origin, religious affiliation, sexual orientation, political beliefs, age, or ability. Additionally, diversity of thought is appreciated and encouraged, provided you can agree to disagree. It is the professor's expectation that ALL students consider the classroom a safe environment.

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All students seeking a Bachelor's degree from Midwestern State University must satisfy a writing proficiency requirement once they've 1) passed the 6 hours of Communication Core and 2) earned 60 hours. Students may meet this requirement in one of three ways: by passing the Writing Proficiency Exam, passing two Writing Intensive Courses (only one can be in the core), or passing English 2113. If you have any questions about the exam, visit the Writing Proficiency Office website at https://msutexas.edu/academics/wpr, or call 397-4131.

Senate Bill 11 passed by the 84th Texas Legislature allows licensed handgun holders to carry concealed handguns on campus, effective August 1, 2016. Areas excluded from concealed carry are appropriately marked, in accordance with state law. For more information regarding campus carry, please refer to the University’s webpage at https://msutexas.edu/campus-carry/rules-policies.

If you have questions or concerns, please contact MSU Chief of Police Patrick Coggins at patrick.coggins@msutexas.edu.