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 December 24th, 2017, 03:42 AM #1 Newbie   Joined: Dec 2017 From: USA Posts: 3 Thanks: 0 How to model as differential equation ? Hi guys, it's my first topic and I need to help. I have tried many many times to model this question as differential equation but I could not reach to success despite all my efforts. Can any body help me? I need to write the model of the system as differential equation but I did not understand exactly how to do. I tried many solutions but... So we can assume: M1 = 500KG ; M2 = 450KG m1(t) = 150KG ; m2(t) = 120KG k1 = 20 b1 = 10 k2 = 25 b2 = 15 Last edited by skipjack; December 24th, 2017 at 06:03 AM.
 December 24th, 2017, 03:28 PM #2 Newbie   Joined: Dec 2017 From: USA Posts: 3 Thanks: 0 Guys, please help. It is very important. I have an idea for this, while working, it came to my mind. Please think like spring, piston and mass. Like as follows :
 December 24th, 2017, 03:40 PM #3 Global Moderator   Joined: Dec 2006 Posts: 20,753 Thanks: 2136 What does "the carrier" mean?
December 24th, 2017, 10:20 PM   #4
Newbie

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Quote:
 Originally Posted by skipjack What does "the carrier" mean?
It means :

 April 18th, 2018, 03:43 AM #5 Math Team   Joined: Jan 2015 From: Alabama Posts: 3,264 Thanks: 902 Frankly it is not clear to me what "having parameters k and b (stopping force for position and velocity)" means. Are those parameters for friction force? That is, is the friction, or retarding force given by -(kx+ bv) where "x" is the position of the car measured from the "tip point of the carrier" and v the velocity of the car? And what is the "tip point the carrier"?

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