What is Mechanical engenereeing: Definition and 100 Discussions

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1. Retired Aerospace Engineer and Backyard Roller Coaster Researcher

Paul Gregg - BSME 1980 UofUtah Boeing Associate Technical Fellow Research and Development of: New Materials and Processes carbon fiber composites, titanium, chopped fiber composites, metal matrix composites Joining Processes: adhesive bonding, diffusion bonding, welding Structural...
2. Book plots position & force on the same graph, still gets right answer

In the picture you can see what I'm talking about. This is a simple problem to do if you can use moments, but alas my education system seems to have something against those. ##AB## is the uniform rod/ladder, G is its centre of mass, BE is the horizontal x axis, AD is the wall, BD is the smooth...
3. Design of bolts - Influence of higher free length

Hello all, In a recent discussion, I came across this question of influence of free length (or unthreaded length) in bolts in retaining the clamping force between the elements to be joined. Out of the two proposals in the attached pic., which one will keep the two plates clamped for a longer...
4. Mechanical Engineering projects

Hi Everyone, My name is Neeraj Kirola. I am a final-year student of Engineering. I need suggestions regarding mechanical engineering projects; I found many Websites on the Internet like this, but I need many more projects. Can anyone Suggest more? 🙏 Thanks In Advance.
5. Does the discharge coefficient of an injector depend on the fluid?

The discharge coefficient is the ratio of the actual discharge to the ideal discharge and can be measured experimentally. If one were to experimentally measure the discharge coefficient using water, would this value be constant for all incompressible fluids? What does the discharge coefficient...
6. Finding the Equivalence Ratio of Combustion (Methane + Air)

I'd like to do some experiments with flames at different Equivalence Ratios - but I'm confused as to how I can find the Equivalence Ratio for different conditions. Wiki-article So the stoichiometric balance for Methane + Air is CH4 + 2(O2 + 3.76N2) -> CO2 + 2H2O + 7.52N2 Referencing equations...
7. Looking for a manufacturer to build a custom compound bow for me

Hello I am looking for a manufacturer or mechanic that can build my custom compound bow. It doesn't have to be a big business. I would appreciate any help. Thank you
8. Understanding Gas Dynamics in Piston-Crank Slider System

I need help understanding what happens to the gas that is being worked by the piston, in the crank slider. My goal is to produce linear motion on an object up to a certain height and I'm wondering since the slider moves back during the rotation of the crank what happens to the object I'm trying...
9. Torque requirements for launching a soccer ball

I am designing a soccer ball launcher (like the one in the attached picture) for school and am having trouble figuring out how much torque I need the motors to have. I am trying to follow an energy analysis approach to get these calculations done. Attached is a file of my calculations so far...
10. Compound planetary gear problem

Hi, I need a little help with this problem with compound planetary gears. I don't know how to apply the formulas for this specific type of placement. I need to know the final speed of the engine knowing the number of teeth z1 = -104 ring gear which is internal, z2,3,4 = 22 for small planets...
11. Film Advance system research for DIY Camera

Dear All, I'm a french professional photographer working on Still Life and Architecture. As a long time and personnal project I'm working on a 3D printed/Laser cut analog camera that will shoot 6x4.5 frames. In the end it will be some kind of rangefinder with integrated electronic light...
12. Classical mechanics -- Equations for simulating the motion of a body

Hello forum, i want to make a samulation of a body. The body will be moved horisontal on y,x axis. I want on my simulation the body to change direction many times(for example i want to go for 10sec right and then left end right...). My question is does i need more than one differential equation...
13. Not sure if I have the correct angle and mass for this sum of forces

Balance the forces east-west: 3.5kg*sin45º + 4.2kg*cos30º - 4.8kg*sin30º - E*cosΘ = 0 E*cosΘ = 3.712 kg balance north-south: 2.8kg + 3.5kg*cos45º - 4.2kg*sin30º - 4.8kg*cos30º + E*sinΘ = 0 E*sinΘ = 0.982 EsinΘ / EcosΘ = 0.982 / 3.712 tanΘ = 0.2645 Θ = 14.8º ◄ E = 3.712kg / cos14.8º = 3.84...
14. Thermodynamic Systems - Volume, Final Pressure and Final Temperature

Mass = 0.12kg Initial temp = 500°c = 773K Initial pressure = 0.8 MPa = 800,000 Pa Final volume = 90L R = 287 Jkg^-1K^-1 1) Initial Volume V=mRT/P 0.12 x 287 x 773 / 800,000 = 26,662.12m^3 2) Final Pressure P2 = P1P2^1.2/V2^1.2 800,000 x 26,662.12^1.2 / 90 = 1,816,095,330 Pa = 1,816 MPa 3)...
15. Studying Jogging my memory.... (refreshing on subjects before returning for my MSME)

Hi folks, I am returning to school this coming fall to pursue a M.S. degree in Mechanical Engineering. This fall, I will have been out of school for about 3.5 years and let me tell you, I have forgotten a large portion of calculus and intermediate classical physics :D. Rather than have this...
16. Hydrostatics Pressure - Finding thrust and resultants

Homework Statement I'm getting stuck with this one and in need of some direction! Obviously I'm not looking for a direct solution, but maybe a outline of what I should be doing? (I'll attach an image in a few minutes) <Image here incoming!> Known data: d2 = d1 / 2 F = thrust force (N) Pa = ρ...
17. How many O-rings would a mechanical engineer use here?

Hello everybody! Happy 2019! I'm trying to design a mechanical face seal for the part shown below, and I'm struggling with the number of o-rings I'm supposed to use. There are two cavities (rings) for two different fluids. The liquid dynamic pressure for both the internal and external fluids is...
18. Why is the output in the middle of the block diagram?

(mentor note: not really a homework as the OP seeks understanding from an article) 1. Homework Statement I saw this on https://www.electronicshub.org/open-loop-system/, I thought the dry clothes should be the output, and heating the cloth should be the plant/process, I am so confused...
19. Engineering Suggest a good book on the theory of elasticity & structures

I am 2nd year physics undergrad. Just want to study a bit about materials in my free time. I have no idea about engineering books. Please suggest some good books. Thanks.
20. Automotive Calculation of the efficiency of an engine

We know efficiency (η) = Woutput/Winput Now in any cycle, for instance, the Otto cycle, let the total work output be WO, total heat added be WH & the total work done on the gas to compress it be WC. Then, will efficiency be equal to (η) = (WO-WC)/WH ? Or will it be equal to (η) = WO/(WH+WC) ?
21. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 1: Introduction and Fundamental Concepts - I

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
22. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 2: Introduction and Fundamental Concepts - II

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
23. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 3: Introduction and Fundamental Concepts - III

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
24. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 4: Fluid Statics Part - I

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
25. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 5: Fluid Statics Part - II

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
26. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 6: Fluid Statics Part - III

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
27. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 7: Fluid Statics Part - IV

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
28. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 8: Fluid Statics Part - V

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
29. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 9: Fluid Statics Part - VI

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
30. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 10: Kinematics of Fluid Part - I

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
31. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 11: Kinematics of Fluid Part - II

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
32. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 12: Kinematics of Fluid Part - III

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
33. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 13: Conservation Equations in Fluid Flow Part - I

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
34. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 14: Conservation Equations in Fluid Flow Part - II

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
35. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 15: Conservation Equations in Fluid Flow Part - III

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
36. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 16: Conservation Equations in Fluid Flow Part - IV

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
37. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 17: Conservation Equations in Fluid Flow Part - V

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
38. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 18: Conservation Equations in Fluid Flow Part - VI

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
39. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 19: Conservation Equations in Fluid Flow Part - VII

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
40. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 20: Conservation Equations in Fluid Flow Part - VIII

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
41. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 21: Conservation Equations in Fluid Flow Part - IX

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
42. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 22: Fluid Flow Applications Part - I

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
43. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 23: Fluid Flow Applications Part - II

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
44. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 24: Fluid Flow Applications Part - III

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
45. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 25: Fluid Flow Applications Part - IV

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
46. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 26: Fluid Flow Applications Part - V

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
47. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 27: Fluid Flow Applications Part - VI

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
48. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 28: Fluid Flow Applications Part - VII

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
49. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 29: Incompressible Viscous Flows Part I

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/
50. Fluid Mechanics by Prof. S.K. Som (NPTEL):- Lecture 30: Incompressible Viscous Flows Part II

Copyright strictly reserved to Prof. Som and NPTEL, Govt. of India. Duplication prohibited. Lectures: http://www.nptel.ac.in/courses/105101082/ Syllabus: http://www.nptel.ac.in/syllabus/105101082/