Recent content by cb951303

Ok I now know that the above diagram and formula is false. The force needed to move the tire is equal to the static friction between the tire and the road right. So F_s = W.cos(\alpha).\mu_s But there is also W.sin(\alpha) and F_{rr} working in the opposite direction of F_s so the force needed...

How would I have to change the above equation if let's say there is an obstacle in front of the wheel by the dimensions LxL like in below thank you

Ok I think I cracked it. According to wiki page rolling resistance is applied in the reverse direction of the motion from the center of the wheel (somehow I missed it the first time sorry) Since there is no acceleration the overall force should be 0 thus I can write this equation F_s =...

Ok from what i understand rolling resistance creates a torque opposite to the motor but where from the force is applied? How can i include in my calculations?

Diagram = http://i.imgur.com/LaUO4.jpg The tire is powered by a motor of torque T. It's weight is W and the static friction force is Fs. Consider that the tire is moving upwards in a constant speed of V. I would like to understand the relations between forces on a model like above. Also how...

Now that makes sense! I must say I had no idea about the step 2 (combining state space matrices) so I didn't even think about state space form. it should work much faster and I can finally use a library like CLAPACK for the matrix operations without having to write them myself as I would have to...

you misunderstood, am I really that unclear :) ?? the problem is not converting transfer function to ODEs it's to make the computer find the transfer function of a system from its block diagram. state space and ODEs comes after I solve this. PS: maybe I'm missing something if so can you pls...

I'm saying that the solution (Y)is a linear combination of the blocks(C, G) and the input(U). So yes, your solution is true but by the form of it I think you found it by applying reduction? I'm trying to do the same with solving linear equations which is I think easier for computers. I don't...

that's exactly the kind of feedback I'm looking for. block diagram reduction seems a bit messy for a computer to do. maybe it can be achieved with a directed graph data structure to hold the block diagram but other than that I fear it would be very slow. but I'll see what can I do with...

thanks for your input. I think I didn't make it clear. you see the problem is not about converting transfer function to state space. I already know how to do it. The problem is to make a computer to find the transfer function of a system from its block diagram. it's more like a "finding the...

can you elaborate what you mean. My aim is to write a program that does this not use simulations like SPICE otherwise I could plot it in 5 seconds with Matlab/Simulink :)

Hello, I'm a senior mechanical engineering student. I'm trying to write an application that plots the system response for a given block diagram in frequency domain just for fun. Take the system shown on the attachment for example. What I have in mind is to find the Y/U transfer function...

attempt: 5y" + 0y' + y = u since my diff. eq. is second order, I should have 2 state variables: x1 = y x2 = y' so the state space model's matrixes become A = [ 0 1 ] B = [ 0 ] [ 1 0 ] [ 1 ] C = [ 1 0 ] D = [ 0 ] does it look ok?

Homework Statement Hi guys/girls Professor gave this very simple homework where I need to convert the system below to a state-space model. The system itself is represented by the equation m*x" + k*x = f(t) Where m = 5 and k = 1. Note that, " (doublequote) is a second-order derivative...