mechanical exercises applied to machines

[snaroz]

Hello, everyone.
I'm a second-year mechanical engineering student.
I must carry out the exercise for the course of mechanics applied to the machines that is located at the following link:http://www.ingegneriameccanica.org/esercitazioni/2012/benna.pdfI have of course studied quite in detail the theory that is presented on the texts of applied mechanics and rational mechanics.
Point 1, even if I have to think about it, I think it can be done quietly.
the problem is point 2. that means the phrase: "this analysis will have to be implemented in a chosen programming language"?
I don't want anyone to do the drill for me. I prefer to take a low vote for it:wink:
Thanks for the advice!

 

[Ivan1990]

Hello, everyone.
I'm a second-year mechanical engineering student.
I must carry out the exercise for the course of mechanics applied to the machines that is located at the following link:http://www.ingegneriameccanica.org/esercitazioni/2012/benna.pdfI have of course studied quite in detail the theory that is presented on the texts of applied mechanics and rational mechanics.
Point 1, even if I have to think about it, I think it can be done quietly.
the problem is point 2. that means the phrase: "this analysis will have to be implemented in a chosen programming language"?
I don't want anyone to do the drill for me. I prefer to take a low vote for it:wink:
Thanks for the advice!

I think that in addition to doing the various calculations you also have to put them down in a type of programming language between those that gives you after as options. (if you write on google the types of languages find explanations on how they work.

 

[snaroz]

But what do I need? to solve equations? Is there any example on the net?
I really don't know where to start.
Thank you!

 

[PierArg]

But what do I need? to solve equations? Is there any example on the net?
I really don't know where to start.
Thank you!

Hi.
simply the prof wants that instead of solving it with paper and pen you make a little program with one of the programming languages mentioned.

 

[snaroz]

hi, but the prof wrote that the exercise should be delivered on sheets a4, so I don't understand what I have to do with those languages he mentioned. .

 

[Ing Italy]

beautiful as exercise! they made it to us also paper and pen; the idea of doing it in code seems very beautiful to me...if I were you I would do it in matlab can come particularly cute you could make a progammino that parameterizes all the analysis in relation to the course of the free coordinates of the system by giving the parametrizing functions the motion directly from the user in such a way that according to the law of motion set then determines the cinematic analysis. I want you to go.

 

[cacciatorino]

But what do I need? to solve equations? Is there any example on the net?
I really don't know where to start.
Thank you!

it seems absurd to require in-depth knowledge of computer science for a rational mechanical examination, maybe one knows how to shape the problem from the mathematical point of view, but then he can not translate it into c++ or python or etc! bah!

Make a spreadsheet on excel, maybe it's okay with him! :wink:

 

[snaroz]

it seems absurd to require in-depth knowledge of computer science for a rational mechanical examination, maybe one knows how to shape the problem from the mathematical point of view, but then he can not translate it into c++ or python or etc! bah!

Make a spreadsheet on excel, maybe it's okay with him! :wink:

Hello, no one taught us anything about computer science at our university.
and then, what does it mean that the results of the analysis should be presented in graphic form? Where graphics?
the prof in the course notes wrote that the exercise will have to be delivered on sheets a4, so I don't understand what I need the pc!

 

[Ing Italy]

I believe that the graphic form is the trends of the cinematic grandesses of interest...so from you the examination of computer science and numerical calculation is not there?if it is so then your prof can not ask you this thing, try to talk to him...to me however it seemed a great exercise as a setting because to manage temporal trends with an excel sheet that by its nature is static does not seem to me neither practical nor productive. ..according to me knowing well the programming languages in these cases can give many advantages of clarity and timing, hello!

 

[snaroz]

I believe that the graphic form is the trends of the cinematic grandesses of interest...so from you the examination of computer science and numerical calculation is not there?if it is so then your prof can not ask you this thing, try to talk to him...to me however it seemed a great exercise as a setting because to manage temporal trends with an excel sheet that by its nature is static does not seem to me neither practical nor productive. ..according to me knowing well the programming languages in these cases can give many advantages of clarity and timing, hello!

There was only one java programming exam, which I haven't done yet. of numerical calculation nothing.
I studied mathematics, physics, a part of rational mechanics etc... but computer science for the moment I know nothing.

 

[Fulvio Romano]

It seems quite clear. . .

develops the kinematic analysis of the mechanism by employing the method of equations
closing. in particular this analysis must be implemented in a language of
programming (c++, ch, matlab, octave, etc.). the pistons of the
hydraulic cylinders such as moving members and siege hourly harmonic laws
imponing an alternating motion. the width of the cylinder oscillation must be
choice congruently with the size of the mechanism. analysis results
must be presented in graphic form.

if you make a mathematical model that describes the kinematics, then calculate the various reactions according to the position. then assigning time laws to actuators, you can get the stress trend, to be presented in graphic form.

Of course the more you have time and desire, the more stuff you can simulate.

the suggestion of using matlab seems to me great, so at least it exploits the basic functions already written.

 

[Fulvio Romano]

I see you don't know anything about programming. Bad cat to peel.. .

But maybe it could be an excuse to study a little matlab that always does well...so there is not so much code to write and with a "plot" you can make egregi charts

eventually, throw down some ideas, that to write the matlab code we help you.

 

[Nicolas]

Hello, everyone.
I'm a second-year mechanical engineering student.
I must carry out the exercise for the course of mechanics applied to the machines that is located at the following link:http://www.ingegneriameccanica.org/esercitazioni/2012/benna.pdfI have of course studied quite in detail the theory that is presented on the texts of applied mechanics and rational mechanics.
Point 1, even if I have to think about it, I think it can be done quietly.
the problem is point 2. that means the phrase: "this analysis will have to be implemented in a chosen programming language"?
I don't want anyone to do the drill for me. I prefer to take a low vote for it:wink:
Thanks for the advice!

............
in the far 93-94 already made us implement routine of cinematic analysis with matlab or fortran at our choice.
Obviously it is easier to use the matlab.
If you want advice learn it because it will save you several times... .
However, it applies the closing equations to the cinematics and then with the matrices projected in the plan all you want.
but not as absurd as exercise. set the calculation formulas well and various reference systems then write the routine.:finger:

 

[snaroz]

Thank you guys! to me, however, it pisses me off: if knowledge of programming languages is required, why did they not tell us before?
I can't study in a month since the beginning of the course twenty things including rational mechanics, applied mechanics and matlabs, can't you?
now I will see in the meantime to do everything with paper and pen

 

[snaroz]

However, it applies the closing equations to the cinematics and then with the matrices projected in the plan all you want.
but not as absurd as exercise. set the calculation formulas well and various reference systems then write the routine.:finger:

Hello, thank you for the answer:smile:
but do I have to do this with paper and pen?

 

[PierArg]

Hello, thank you for the answer:smile:
but do I have to do this with paper and pen?

but why not ask the prof directly to clarify everything?

for what seems to me to understand the job you have to do twice:
- paper and pen
- programming language

Maybe you do a relay with the traditional dissolution of the exercise (paper and pen) and with the annex of the numerical code.
put everything on a cd/dvd and deliver it to prof.

 

[Fulvio Romano]

but why not ask the prof directly to clarify everything?

for what seems to me to understand the job you have to do twice:
- paper and pen
- programming language

Maybe you do a relay with the traditional dissolution of the exercise (paper and pen) and with the annex of the numerical code.
put everything on a cd/dvd and deliver it to prof.

actually asking the professor I think it's the best thing.

I don't think it's a thing twice, but in two different ways. pen computes only the most unfavorable condition.

I don't know how much pressure you are, but the idea seems good to me. It's true you don't study programming, but it's also true that you don't have to test operating systems to write two lines in matlab.

I repeat, with minimal effort you can open a world, which at university you can do for the last time in your life.

I hope you will take the opportunity. I'll take three minutes to write that code to you, and I'll gladly help you.

Moreover, if you have difficulty finding matlab at university, you can use freemat which is free and uses the same language. we say that if you do not have to use special functions (such as those on neural networks) the two programs are perfectly equivalent.

 

[snaroz]

Thank you so much for helping you guys. I'm going to work and keep you updated!

I think the first thing to do is understand how the mechanism works. I cannot find the translation of the various terms mentioned in the figure.
Meanwhile I say that kind of rod called "stunga" (what do you mean?) serves to make go "up and down" the arm indicated as "boom" right?
the piece indicated as "tripower", assuming absent links with "bucket roll cylinder" and "boom cylinder", has the possibility to rotate around a axis passing the final end of "stunga"?
then the "stick cylinder" stretching or contracting it moves to the left or to the right the stick?
the task of the "boom cylinder" is to rotate (by means of stretches or contractions) around the passing axis for the extreme final of "stunga" the tripower?
Finally, the "bucket roll cylinder" rotates the bucket around the stick?
Is there any animation of this mechanism?
Thank you!

 

[tortellino]

Then.
ettore pennestrì has developed several programs (together with august of blessed) of cinematic analysis.
you find them all collected in the book (three volumes) analysis and kinematic synthesis of machanism (of blessed pennestry).

so we say that pennestrì favours fortran and its emulus matlab.
the exercise in question has been "stealed" to his colleague nicola pio belfiore, of the university wisdom and is carried out on a text of which I do not remember the name (it is a book in two volumes of dark color).

cmq if you take the book that I have reported to you, find everything, including the style that you pennestrì look for.

 

[snaroz]

I don't know how much pressure you are, but the idea seems good to me.
I repeat, with minimal effort you can open a world, which at university you can do for the last time in your life.
I hope you will take the opportunity. I'll take three minutes to write that code to you, and I'll gladly help you.

Ummm, under pressure enough since I have to deliver it on Wednesdays.
anyway I like to study these things so slowly I will certainly deepen matlab!
He thinks that I am studying myself rational mechanics (necessary for understanding applied mechanics) since in my study plan there is no trace!