Recent content by zaurus

The oscillator is a cable with a mass on it being lowered into water. I measured the tension in the cable at a specific depth in the water (at a given depth the mass system resonates...something I want to model). I was thinking that I might be able to find the damping coefficient by solving...

I have the following equation subject to y(0)=0 and y'(0) = 0 my'' + b y' + k y = C I have done an experiment where I measured force at given depth for a dampened harmonic oscillator. Is it possible to use the force I measured to solve for displacement and then back out coefficient b for...

Just to clear up what I read on the site, basically I take .707*weld leg and multiply it by the weld length to get a unit Area then calculate the moment of inertia for the weld as a line: 1/12 L^3 Tbending = M.y/I u Tshear = P /A Tresultant = Sqrt (τ b2 + τ s2 ) then plug into...

Thanks PhanthomJay, this is exactly what I am looking for.

I believe you want your switch to be the criteria you are comparing, ie. y and your statement following the case to be B (the variable you are assigning a value to). Switch y case '{1,2,3,5,7}' B = true case '{4,6,8,10}' B = false . . . etc

Yes, thank you for your help. I don't know if you would also be able to help with this question, but how would you go about calculating stress in a fillet weld at the base of the cantilever due to this bending? I found some information online about finding where you find the throat of the...

Homework Statement I have attached a figure showing beam bending around 2 axis. I need to calculate section modulus Sx and Sy but seem to be getting the major and minor axis confused. I guess the problem comes in when I go to select which term is squared in my equation below. Homework...

Dr. D, Thakkisfox responded to another thread I had created (before any responses were posted on this one). I then referred him to this discussion. His response was: "Your equation is correct :D It is basically a 1D motion, of a damped driven harmonic oscillator.. But if you want...

Thaakisfox, Wow. I totally wasn't anticipating a response like this. This may take me a while to digest (goes back to a viscous fluid flow class I took a while ago)...I see in the end you derived an effective mass for the spring system. Am I correct in saying this effective mass would take...

Thank you for your help Dr. D.

Dr. D, I am assuming a heavy object which will not float and yes tension in the rope. I think my questions have been answered. I was really concerned with obtaining a value for damping coefficient, b...as you stated would probably need an experiment. Would you happen to know general or...

I do have a freebody diagram as described, however, I am lowering the mass therefore my damping term will be opposite yours. FYI, my coordinate system is setup positive down + weight + inertia - bouyant force - damping force - spring force m y'' = W - Fdamp - Fspring - Fbouyant...

So you can only use plastic wheels, but what about a tread or other extension that comes down after the round begins?

Dr. D, Thanks for your reply! I was starting to worry no one would answer. I am a little confused by your response - You say that I can't really equate by' = 0.5*rho*Cd*A*y'^2. The confusion comes in your next, seemingly contradictory statement, "but there is no need to do so...the...

Hi, I am working on a problem with a free hanging mass attached to a spring and damper in parallel. I believe my system equation is as follows: my'' = mg - by' - ky My questions: 1) It has been a while since I've taken this course and just wanted to confirm I wrote my system...