What is Coupled: Definition and 414 Discussions

Coupled is an American reality show that aired on Fox from May 17 to August 2, 2016. It was hosted by television personality, Terrence J and created by Mark Burnett, of Survivor, The Apprentice, Are You Smarter Than a 5th Grader?, Shark Tank, and The Voice, as well as Ben Newmark, Dan Newmark and Larry Barron.Filming took place in Anguilla. The cast included Miss Arizona USA 2009, Alicia-Monique Blanco; Miss Colorado USA 2015, Talyah Polee; host, Domonique Price, and American singer-songwriter, TV personality, and former collegiate athlete; Alex Lagemann.
Tyler Gattuso was in the running to be a cast member on Big Brother 17, but was ultimately not chosen due to the news being leaked by online media and his Instagram hinting at the news suggesting he wasn't going to be active for quite a while. A few days later, after the cast for Big Brother was announced, he was ranting on Twitter, shortly deleting them and deactivating his account.On August 8, 2016, Fox canceled the series after one season.

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  1. J

    Coupled inductor boost converter - Ripple current

    I am trying to calculate the ripple current in boost converter for ∆i1 and ∆i2 between time intervals between DT and T, and also dependent on the voltage level (Vin or Vin-Vout). To find a formula for ∆i1 and ∆i2, two formulas have to be derived for them. This is done from the equation: I...
  2. L

    Engineering Synchronous motor coupled to a DC Compound Motor Problem

    Hi All. I'm having trouble working out the solution to this problem. A Synchronous motor is coupled to a DC Compound Motor. The DC Machine is rated for 220 V DC. Its Armature Resistance is 1.0 Ω . The Synchronous Machine is a 4 pole 400 V 50 Hz 3 Phase AC Machine with an efficiency of 80%...
  3. B

    Derive a wave equation for an n mass coupled system

    1. Derive the wave equation for longitudinal vibrations in an extended 1-D system of masses and springs. The average distance between masses is D [m], the spring constants are K [kg/s2 ], and the masses are M [kg]. b) Determine the wave speed c as a function of D, K, and M. Verify that it has...
  4. D

    MHB ODE 45 solving coupled ODE's (Pred, Prey, Resource) with graph outputs.

    This is the code for Sensitivity Analysis via Rosenwasser's method. Code was for my Masters Thesis, so maybe it will be useful to someone in Dynamical Systems or Modeling with ODE's function ode45_both_age %-------------------------------------------------------------------------- % Solves...
  5. D

    MATLAB Coupled systems of ODE's solved by matlabs ODE45 (Runge Kutta Alg.)

    Use the code as needed, its free to all! Please note this code is only for one mfile, you will need to add them all to the same file path for it to work. Others will be in the next post. They have to run simultaneously to work and give output. function dydt =...
  6. R

    Coupled differential equations using matrix exponent

    Homework Statement Solve the following coupled differential equations by finding the eigenvectors and eigenvalues of the matrix and using it to calculate the matrix exponent: $$\frac{df}{dz}=i\delta f(z)+i\kappa b(z)$$ $$\frac{db}{dz}=-i\delta b(z)-i\kappa f(z)$$ In matrix form...
  7. R

    I Normal modes in a coupled system

    Why would normal modes occur in the coupled oscillator system I.e. why the parts of system would oscillate with constant angular frequency and constant phase difference ?
  8. Marcus95

    Coupled differential equations using matrices

    Homework Statement We can treat the following coupled system of differential equations as an eigenvalue problem: ## 2 \frac{dy_1}{dt} = 2f_1 - 3y_1 + y_2 ## ## 2\frac{dy_2}{dt} = 2f_2 + y_1 -3y_2 ## ## \frac{dy_3}{dt} = f_3 - 4y_3 ## where f1, f2 and f3 is a set of time-dependent sources, and...
  9. davidfam

    Coupled Thermal-structural analysis in ANSYS Workbench

    Hi all, I'm currently working on my bachelor's thesis in mechanical engineering. I must simulate a brake model, which consist of 1 rotor and 1 stator. The rotor rotate around z-axis and the stator move along z-axis. When pressure is on stator placed. The stator and rotor will be pressed...
  10. H

    A Uncertainty Propagation in Coupled Oscillator

    I am a senior physics and mathematics major, and this is my last semester. As a result, I am taking advanced physics lab, which feels more like a grad school experiment than an undergrad. One of the labs deals with the modal analysis of three spring-mass systems placed vertically as shown in the...
  11. D

    Galling of 303 vs. 304 when coupled with 416 Stainless Steel

    I was looking for an appropriate galling resistance stress for a slow moving part I'm designing. You can think of it as a hinge. I found the article linked below which seemed very helpful. Table XI on page 24 shows various galling resistances, including my wear couple 303 vs. 416 Stainless...
  12. J

    Diagonalize a coupled damped driven oscillator

    Homework Statement I am trying to follow a paper, https://arxiv.org/pdf/1410.0710v1.pdf, I want to get the results obtained in equations 5 and 6 but can't quite work out how eq 3 has been diagonalized. Homework Equations eq 3 The Attempt at a Solution As the system is driven i thought I'd...
  13. NirHUJI

    I Not the classic coupled oscillators

    I have a system of a rod hanging on a single point, that can oscilate 360 degrees. Attached to it's lower end is a rotating disc. As you release the pendulum with a starting angle of some kind, the system oscilates. Can anyone help me analize the frequencies related to this motion? Thanks!
  14. D

    Applications of coupled pendulums

    I have done an experiment changing the mass ratio of coupled pendulums. To conclude I need real world applications for the coupled pendulums. But, i cannot find it online. So, it would be really helpful is someone could give examples of this. THANKS!
  15. Telemachus

    Numerical methods for a system of coupled ODE

    Hi there. I have to solve a system of coupled ordinary differential equations. I have some initial values, but in different points of the domain. The equations are all first order. Let's suppose the system looks like this: ##\displaystyle\frac{dy_1}{dz}=y_1+y_2+0.01##...
  16. D

    Coupled pendulums with different masses

    I would like to know how to solve the coupled pendulums problem when the masses of the pendulums are different. BUT the ratio of the masses are known and all other factors are kept constant. Need to find its affect on the beating frequency, but i cannot an equation for this with different...
  17. D

    Extreme Fiber Coupled Laser Diode Power Loss

    What could cause a laser source with fiber coupled laser diodes to have extreme loss of power? The laser diodes have a wavelength of 658nm and have an output rated at 60mW but it seems as though the optical channels actually output ranges between 58 to 70mW. During some troubleshooting I...
  18. S

    Need Help Solving Set of Coupled ODEs

    Homework Statement Liquid nitrogen is in a dewar connected to a vacuum pump. Initial pressure in a dewar is 1atm and saturated with gaseous nitrogen. If the vacuum pump started, it removes gas in it and the pressure in a dewar will be reduced under the saturation pressure of the liquid...
  19. A

    Electrostatics problem: Metal coupled to a semiconductor

    I am simulating a system, where I have a semiconductor with a charge distribution in the conduction band coupled to a metal. I want to calculate the electrostatic potential due to this charge distribution but some things are confusing me. To calculate the electrostatic potential I solve Poissons...
  20. Zanatto

    What are the simple modes and frequencies for weakly coupled oscillators?

    Homework Statement Two simple pendulums os equal length L=1m are connected with spring with a spring constant K=0,05 Mg/L. The pendulums are started by realeasing one of them from a displaced position. The subsequent motion is characterized by an oscillatory energy exchange between the...
  21. P

    Particular Solution of A Coupled and Driven Oscillator

    Homework Statement Consider two masses m connected to each other and two walls by three springs with spring constant k. The left mass is subject to a driving force ## F_d\cos(2 \omega t) ## and the right to ## 2F_d\cos(2 \omega t) ## Homework Equations Writing out the coupled equations: $$...
  22. E

    I Eigenstates of two Coupled Harmonic Oscillator

    Hello everyone! For my quantum mechanics class I have to study the problem of two quantum oscillator coupled to each other and in particular to find the eigenstates and eigenergies for a subspace of the Fock space. I know that, in general, to solve this kind of problem I have to diagonalize the...
  23. B

    Disappearing energy from a series connection of coupled oscillators

    I have been having trouble getting the calculation of energy for a chain of coupled oscillators to come out correctly. The program was run in Matlab and is intended to calculate the energy of a system of connected Hooke's law oscillators. Right now there is only stiffness and no dampening...
  24. M

    MATLAB Coupled System of ODE's with algebraic coefficients

    Hi PF! I have a system of 4 first order linear ODE's, call each ODE ##\psi_1,...,\psi_4 : \psi = \psi(x,y,z,t)##. However, there are three algebraic variables (not ##x,y,z,t##, let's call them ##c_1,c_2,c_3##) that must be solved for as well, and I have three different (non-differential)...
  25. R

    Quantum harmonic oscillator coupled to electric potential

    Homework Statement In ##1+1##-dimensional spacetime, two objects, each with charge ##Q##, are fixed and separated by a distance ##d##. (a) A light object of mass ##m## and charge ##-q## is attached to one of the massive objects via a spring of spring constant ##k##. Quantise the motion of the...
  26. X

    Coupled oscillator: 2 masses and 3 different springs

    Homework Statement Two harmonic oscillators A and B , of mass m and spring constants kA and kB are coupled together by a spring of spring constant kC .Find the normal frequencies ω' and ω'' and describe the normal modes of oscillation if (k C)2= kAkB) Homework EquationsThe Attempt at a...
  27. carllacan

    I Why can't the real scalar field and the EM be coupled?

    According to David Tong's notes the real scalar field can't be coupled to the electromagnetic field because it doesn't have any "suitable" conserved currents. What does "suitable" mean? The real field does have conserved currents, why aren't those suitable?
  28. ShayanJ

    A Numerical solution of two coupled nonlinear PDEs

    One of my friends needs to numerically solve this two dimensional boundary value problem but has now idea where to begin. Could anybody help? ## [(K H )(f g_x-gf_x)]_x+[(K H )(f g_y-gf_y)]_y=0 #### K H G^2 (f^2+g^2)+\frac 1 2 [KH (f^2+g^2)_x]_x+\frac 1 2 [K H (f^2+g^2)_y]_y-K...
  29. DeldotB

    Calculate the Lagrangian of a coupled pendulum system

    Homework Statement Calculate the Lagrangian of this set up: Imagine having two ropes: They are both attached to the ceiling and have different lengths. One has length b and the other has length 4b. Say they are hooked to the ceiling a distance 4b apart. Now, the ropes are both hooked to a...
  30. JulienB

    Coupled spring pendulum (harmonic oscillation)

    Homework Statement Hi everybody! Two masses m1 and m2 are connected with a spring one after the other to a wall (see attached picture). The spring constants are k1 and k2. To consider here are only longitudinal oscillations and no external forces. a) Express the Newtonian equations of motion...
  31. N

    I 4th order Runge-Kutta with system of coupled 2nd order ode motion equations

    MX''=Fn(cosΦ−usinΦ) MZ''=Fn(sinΦ+ucosΦ)−Mg MΦ''=Fn(Bxx+uBz) I tried using Runge-Kutta methods to approximate motion equations in MATLAB but it turn out wrong. I also tired finding and researching forums and web for solution but to no avail. Fn,M,θ,u is constant fn/M = 0.866 it seems that i...
  32. V

    Coupled PDEs - all 4 Maxwell's equations?

    Greetings all, Quick question. I know that all 4 Maxwell's equations are said to be first-order, coupled PDEs, where each equation has an unknown field. I see that with Faraday's and Ampere's law, because, E and H appear in each of those equations. But Gauss' laws, I'm not seeing that...
  33. D

    Coupled Differential Equations

    Homework Statement Hi. I am trying to solve a problem on renormalisation group flow and have come across the following coupled equations that I need to solve: Λ ∂g/∂Λ = b.m Λ ∂m/∂Λ = -2.m + a.g Where a and b are just constants. I need to find g(Λ) and m(Λ). Homework Equations [/B] I...
  34. N

    Normal modes and degrees of freedom in coupled oscillators

    Not a textbook/homework problem so I'm not using the format (hopefully that's ok). Can someone offer an explanation of normal modes and how to calculate the degrees of freedom in a system of coupled oscillators? From what I've seen the degrees of freedom seems to be equal to the number of...
  35. E

    Solve coupled nonlinear differential equations

    Good evening I have these coupled equations and was wondering if there is any chance solving them analytically. If not, how would you approach it numerically? (shown in attachment) Thank you very much
  36. B

    Solving Characteristic Frequencies of Coupled Mass-Spring System

    Hello, I have a problem regarding the characteristic frequencies of a coupled mass-spring system. I have made some relevant progress, but I'm unsure of where to go from here. 1. Homework Statement Find the characteristic frequencies and the two characteristic modes of vibration if the...
  37. C

    What equations are used for coupled pendulums?

    This is for just two separate pendulums on a string, not conjoined pendulums or ones with a spring between them. All I can think of is ∆E = mg∆h, v = √2g∆h', t = 2π√l/g' and f = 1/t.
  38. S

    Understanding Torque Transfer in Coupled Objects

    Hello All, I have a quick question about torque and how it transfers to a coupled object. I am coupling a DC motor onto a worm gear and I need to calculate the tangential and axial forces on the worm. The Tangential Force equation is as follows: Fwt = (2*M1)/d1 where Fwt is the tangential...
  39. T

    Are there coupled reactions in geology?

    I'm just wondering if all known coupled reactions are biological, or if there are some that geological and could have preceded the emergence of life on earth. In other words, are there some compounds in geochemistry that are much more abundant than you would expect if the reactions that produce...
  40. W

    What is the angle between coupled forces with a given moment and magnitude?

    Homework Statement The moment of the couple is 600k (N-m). What is the angle A? F = 100N located at (5,0)m and pointed in the positive x and positive y direction -F = 100N located at (0,4)m and pointed in the negative x and negative y direction Homework Equations M = rxF M = DThe Attempt at a...
  41. B

    How do I solve these coupled Differential Equation?

    Homework Statement dNa/dt = -Na/Ta where Na is the function and Ta is the constant dNb/dt = Na/Ta - Nb/Tb where Nb is the function and Tb is the constant Homework Equations My Prof said Nb(t) has the form Nb(t) = Cexp(-t/Ta) + Dexp(-t/Tb) The Attempt at a Solution I know the first equation...
  42. Q

    Solution to Coupled Second Order ODE's

    Homework Statement [/B] I'm trying to 'solve' two coupled second order ODE's with the intent of putting them in state space. My specific problem is more complex and includes additional equations which are irrelevant. Essentially I can solve the problem if I know the solution to this. x1 and...
  43. D

    What Are the Frequency Extremes and Normal Modes of Infinite Coupled Pendulums?

    Homework Statement Consider a very large (infinite) number of identical pendulums arranged in a row, with each pair separated by a distance d. Each pendulum is a massless rod of length l with a mass m at its end. Identical springs with spring constant k couple each pair of neighbors. What is...
  44. Shahrokh

    Coupled differential equation with boundary conditions

    Hi, I have two coupled differential equations d^2 phi(z)/dz^2=lambda*phi(z)*(phi(z)^2+psi(z)^2-sigma^2) d^2 psi(z)/dz^2=lambda*psi(z)*(phi(z)^2+psi(z)^2-sigma^2+epsilon/lambda) where lambda, epsilon and sigma are arbitrary constants. The equation subject to the bellow boundary conditions...
  45. gfd43tg

    ODE 45 with coupled ODE's in a matrix, reactor temp.

    Homework Statement My question is regarding part (e), I just gave all the questions for reference. Homework EquationsThe Attempt at a Solution These are the coupled equations I should solve (from part d) My issue is using ode45 to get ##C_{A}(t)##, ##C_{P}(t)##, and ##T(t)##. Here is my...
  46. bayan

    Solve 3 Coupled ODEs with NDSolve - Error Fix & Alternatives

    Hi, I need to solve 3 coupled first order ODE's using NDSolve (numerical solution). This is the code I have used ; NDSolve[{u'[t] == ((1 - (u[t]/t^2))/(-3 - (u[t]/t^2) - (v[t]/t^2))), v'[t] == (((u[t]/t^2) - (v[t]/t^2))/(-3 - (u[t]/t^2) - (v[t]/t^2))), w'[t] == (v[t])/(-3 t^2 - (u[t]) -...
  47. tomdodd4598

    Program to solve coupled ODEs?

    Hi there, I have been using Leonard Susskind's lectures on classical mechanics to learn about Lagrangians and Hamiltonians, and decided to try to create a Lagrangian for the double pendulum and another pendulum-related system. I found the equations of motion, but they were unlike any...
  48. duc

    Method to solve a coupled system of matrix equation

    Hello everyone, I'm struggling with a coupled of matrix equations of the general form: AX + CY = cX BY + DX = cY where A, B, C and D are hermitics square matrices. X, Y and c are the eigenvector and eigenvalue to be found. I'm looking for a method or an algorithm to solve this system by using...
  49. niha1794

    Numerically solving 2 coupled PDEs

    I want to solve a system of 2 coupled pde (in MATLAB) of the format: c1*(df/dt)+c2*(df/dz)+c3*(f)+c4*(g)=0 (dg/dt)=c5*f+c6*g with Initial conditions as f(0,t)=1, g(z,0)=0 and f(z,0)=0 0<f,g,z,t<1 I tried using the MATLAB function pdepe to do this but got errors and if I go for numerical...
  50. B

    QM: Two coupled spins in a magnetic field

    Homework Statement Consider two spins, L and R, in a magnetic field along the z-axis, i.e. B = (0, 0, B) . The magnetic moments of the two spins are coupled to each other so that the total Hamiltonian reads H = g\mu_B\mathbf{B}\cdot(\mathbf{S}_L + \mathbf{S}_R) + J \mathbf{S}_L\cdot...
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