Recent content by grecko94

hello everyone, I`m trying to make 3d animation from numerical simulation data. Can someone recommend good software for me Thanks in advance

its settled then ! thank you :smile:

something like this, but the cos surface is elastic and the disk is solid object.

so sorry, i forgot to add the figure

its fine, i already finished this quite long time ago :smile:

Hello guys, i`m currently making simulation of 2 dimension rolling disk on elastic sin/cosine plane. I`m just wondering if the theory applicable.

Hey there, sorry when i said i already finished my program. But my teacher told me to find the error in this data. i`m just wondering do you know any method to calculate error in my program. Thank you in advance program dashpot implicit none integer,parameter :: N=30001,IN=300 integer :: i...

Thank you it going to help me a lot ! Btw just want to inform you, that i already fix the program and it really have beautiful output :smile:

YES SIR, i already did c>0 , and it does fulfill the condition for underdamped , overdamp and critical. If that the case, then i need to add something to my equation of motion. I will try again on Monday at school. By the way, I'm 4th year undergraduate student in japan and on my way to...

hmm... it does seem getting better, with or without damp. but hey, what do you think about the force? the ground exert a negative force at the hill and big positive force on the valley. should i add another condition?, so when the F value goes to negative it equal to zero

Sooo i assumed the time function is not correct ? not dt bu T(i) ?

alright, I'm going to take a look after i finish my part time job. but just one thing, in my program the expression for Ω is wb so Ω = 2* π * velocity of the vehicle(u)/ Distance(d) and i wrote wb = 2*π*U/d isn't the same thing?

Sorry, i try to look at my program and still don't get what you said. can you explain a little bit about it damn,i feel kinda stupid about it now :H

The damping work fine by following damping ratio rule ζ=C/Cc, Cc = 2√km program dashpot implicit none integer,parameter :: N=10001,IN=300 integer :: i real :: pi,dt,k,m,c,U,d,wb,am real,dimension (N)::T,V,X,f !initial condition= position,velocity,time, pi pi = 3.14159265359 dt =...

because F = -K(Y-Yo) -C(y°-yo°) Y is the displacement of the spring which in my program is x Yo is the wavy surface profile and since Yo = A sin(Ωt) then the code am*sin(wb*dt) and yo° = ΩA cos(Ωt) and the code wb*am*cos(wb*dt)) Ω= wb U= car velocity dt = time you are right, i don't...