# Thread: How to represent as DE ?

1. ## How to represent as DE ?

I have a homework but despite all my efforts, I could not. I need help about it. I do not expect exact solution but if you help me I would like to solve and get verification from you.

About the question : I have to get differential equation from this :

quest.jpg

And values for question right here :

M1 = 500KG
M2 = 450KG

m1(t) = 150KG
m2(t) = 120KG

k1 = 20 , b1 = 20

k2 = 10 , b2 = 15

2. Originally Posted by aaeerr
I have a homework but despite all my efforts, I could not. I need help about it. I do not expect exact solution but if you help me I would like to solve and get verification from you.

About the question : I have to get differential equation from this :

quest.jpg

And values for question right here :

M1 = 500KG
M2 = 450KG

m1(t) = 150KG
m2(t) = 120KG

k1 = 20 , b1 = 20

k2 = 10 , b2 = 15

What do you about the PHYSICS of the tip pont control? Are you supposed to use work-energy method to establish the equation of motion? You must have a similar problem as an example problem in your text-book (or in your class-notes).

3. Originally Posted by Subhotosh Khan
What do you about the PHYSICS of the tip pont control? Are you supposed to use work-energy method to establish the equation of motion? You must have a similar problem as an example problem in your text-book (or in your class-notes).

It is first example unfortunately. It looks like spring piston and mass, but still I could not get differantial equation. We should think as follows :

queststp.jpg

4. Originally Posted by aaeerr
It is first example unfortunately. It looks like spring piston and mass, but still I could not get differantial equation. We should think as follows :

queststp.jpg
Do you know the ODE for one mass (one df) system?

5. Originally Posted by Subhotosh Khan
Do you know the ODE for one mass (one df) system?
[hr]
Yes I learned myself but the above model is wrong that I have drawn. Unfortunately I learned it is wrong, my next opinion is related to Second Law of Newton.

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