What is Coupling: Definition and 385 Discussions

A coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power. The primary purpose of couplings is to join two pieces of rotating equipment while permitting some degree of misalignment or end movement or both. In a more general context, a coupling can also be a mechanical device that serves to connect the ends of adjacent parts or objects. Couplings do not normally allow disconnection of shafts during operation, however there are torque-limiting couplings which can slip or disconnect when some torque limit is exceeded. Selection, installation and maintenance of couplings can lead to reduced maintenance time and maintenance cost.

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  1. R

    Rotating Coupling Pin-Mechanical Failure as a Safety Precaution

    Rotating Coupling Pin--Mechanical Failure as a Safety Precaution Hi everyone, I am RagingCalm, a mechanical design engineer. I hate to ask for help on my very first post but considering that I am utterly stumped and no one at the office can help me...well...ummm...help, please. :frown...
  2. N

    Direct Coupling of Energy Groups, Multigroup Neutron Diffusion

    This one comes from Duderstadt and Hamilton, Problem 7-3. In multi-group diffusion theory What percentage of neutrons slowing down in hydrogen will tend to skip energy groups if the group structure is chosen such that \frac{E_{g-1}}{E_{g}}=100= 1/\alpha_{approx}. I know that the...
  3. bcrowell

    Angular momentum coupling with graviton exchange?

    I know there are many deep issues that come up in attempts to do quantum gravity, but I suspect that the following is not deep but easily explained by someone who knows more about this than I do. Suppose two neutrons are interacting gravitationally. The Feynman diagram that I would naively draw...
  4. Cybertib

    Poynting theorem for light-matter coupling in an absortive medium

    Hello everybody, I'm focusing on the description of the coupling of a monochromatic short EM wave and on the description of the energy absorption by matter. The problem is the following. It is well-known that the Poynting theorem in a non-dispersive medium considers the variation of...
  5. askhetan

    On the physics of exchange, correlationa and coupling phenomena

    I have recently started my phd on ab-initio simulations, and have several confusions about the calculations (lets say with a method like DFT) of solid crystal structures. 1. what exactly are the exchange and correlation phenomena. I have read texts and books which describe its physical...
  6. E

    ZEMAX Help for coupling Diode Stack

    Hello! So I've been working on a project to couple a 15 bar diode stack into a 600 micron fiber. Using an old design that I've used in the past but it's giving me some issues. I don't have a plethora of experience with ZEMAX so I'm hoping to leverage the collective consciousness of the...
  7. P

    Why is the center of mass energy linked to the parameter \mu?

    My course on QFT follows Srednicki's book. He derives the running of coupling constants in different theories in the following way: When he uses dimesional regularization (going to x-\epsilon dimensions), he has to introduce a parameter \mu with dimensions of mass in oder to keep the coupling...
  8. B

    QCD string tension at strong coupling: log(g^2) vs. g^2

    Hi everyone, I am trying to understand some things about confinement in lattice QCD. It has been very difficult so far to find a clear book chapter or review article, so I had to resort to the original literature in many cases, and I came across some apparently incompatible statements about...
  9. J

    How Do You Calculate Magnetic Force and Torque in a Magnetic Coupling?

    Hello, I trying to create a magnetic coupling on the end of a shaft but I need to work out the size of the magnets that are needed. The torque on one shaft needs to be transferred to the other through the magnetic interaction. The magnets on the outer shaft will be opposite polarity to...
  10. K

    Question over Coupling capacitors and Op-Amps

    So this is the op amp I am looking at and I have a few questions, not entirely sure how to ask them, but I'll ask more as I find out more http://postimage.org/image/i228xrkj7/ http://postimage.org/image/i228xrkj7/ So the capacitor C1 and C3 are used to block DC, but when you add these do you...
  11. F

    Mechanics of material shaft coupling

    A shaft of a total length L, connected via coupling C to the engine on the left-hand side, transfers the power P while rotating with n revolutions per second. A gear with pitch diameter D1 and thickness t1attached to the shaft at the distance Lg from the coupling C is in mesh with the driven...
  12. M

    Pairing gap equation weak coupling

    In the limit of weak coupling, G\overline{ρ}<<1, the BCS pairing gap equation gives that Δ \propto exp(-1/G\overline{ρ}). \overline{ρ} is the level density.This cannot be developed as a power series in the interaction strength G. Does this imply that there is a phase transition between a...
  13. FOIWATER

    Capacitive coupling on breadboard

    I have read that between breadboard nodes there can be as much as 25 pF of capacitance. I have a much better time understanding how parasitic induced voltages work, with respect to magnetic fields. I have a much harder time understanding how signals can become noisy due to parasitic...
  14. D

    Gyroscope coupling force force question

    Hello everyone, I saw this video in youtube: And I have some questions, can someone please explain me the forces acting on this gyro? what is the momentum that keeps the cheese from falling, the direction of its action don't add up to me Also, how could i calculate the force needed to...
  15. O

    Finding components of 2s2p configuration using LS coupling

    Homework Statement The lowest excited states of the Be atom correspond to a 2s2p configuration of optically active electrons. What 2s+1Lj components originate in this configuration? Assume that Hund's rules hold for the multiplet and deduce the ordering of the energy levels. Refer to a table...
  16. N

    AC coupling using NMOS and PMOS

    AC coupling using NMOS Hello. What does AC coupling by using NMOS and PMOS actually means?
  17. C

    Zeeman effect - spin orbit coupling

    As far as I know: the possible orientations that the total angular momentum can take (given my Mj) are degenerate. if we apply a magnetic field, degeneracy will be lost and different states arise. this is the zeeman effect but when looking up on google for zeeman effect, a webpage used as an...
  18. N

    Coupling order in Fenman diagrams

    Sorry if this appears a basic question, but could you pls advise me is it possible to have a two identical vertexes but with different strength coupling? I have some toy Lagrangian and when I calculate Feynman rules I get for one vertex following expression: (M1+M2)*(combination of...
  19. N

    Origin in Inertial Frame for Spin-Orbit Coupling?

    Hello, I've seen spin orbit coupling being explained by going to the rest frame of the electron and noting that the proton is then a moving charge and hence has a magnetic field, which interacts with the spin of the electron, effectively coupling the spin and angular momentum of the electron...
  20. F

    Rare-earth energy levels from LS coupling

    Hey all, Is there a way to rank the energy levels of a rare-earth ion in order of increasing energy just from the spectroscopic terms? Nd3+ has an electron configuration of [Xe]4f^3, which produces energy levels such as 4I, 4F, 2H, 4S, 2G, 4G, 2D, etc from the electrostatic interaction...
  21. J

    Can Fluorescent Lights Illuminate Under Power Lines Due to Capacitive Coupling?

    I came across an interesting picture. Many of us know about fluorescent lights being able to illuminate under high tension power lines. My first thought of mechanism for this was “induction”, however it was suggested that this is done by the Electric field not the Magnetic, (B). The...
  22. S

    Evanescent wave coupling between two prisms

    Hello all, I have recently encountered a problem in my understanding of how evanescent waves work. The problem will refer to the diagram found at http://www.popularscience.co.uk/features/nimtz2.jpg (while the evanescent wave isn't drawn this is the only example i could find). So...
  23. 1

    Engine - Drive Shaft Coupling Torque

    Homework Statement A solid drive shaft is connected to an engine by a coupling, which has drive pins located on a pitch circle diameter of 80 mm (Note: the diameter of the pitch circle is greater than the diameter of the drive shaft). If the maximum power output of the engine is 90kW at 5000...
  24. R

    Exchange coupling constant in micromagnetic simulation

    Hi, all. I'm wondering if anyone's done some simulation of magnetic material with LLG equation. The question is where can I find the value of exchange constant for a material. In LLG equation, the exchange constant is in the unit of "J/m", and the typical value is 10^-11 J/m, for some...
  25. J

    Electron mass increased by electromagnetic coupling like it is by Higgs coupling?

    Would electromagnetic coupling between an electron with charge e and an electromagnetic field with scalar potential V_em add to its mass in the same way as its coupling to the scalar Higgs field? i.e. mass_electron = g V_Higgs + e V_em Somewhere I got the picture that a left-handed...
  26. A

    Renormalization and running coupling constant

    Hi everyone, even if I continue reading books about renormalization, I have the same basic doubts. So we have radiative corrections that give infinites etc.. So what we do is regularize and renormalize the theory. What is left at the end? Is it true that loops are no longer there since the...
  27. V

    Jj coupling scheme and electronic configuration

    Homework Statement Write all possible terms (n1 j1, n2 j2, …) J for these electronic configurations (considering jj coupling scheme): 1s2 1s2s 1s22s22p 1s22s22p5 The Attempt at a Solution 1s2 I have two electrons in the s sub-shell, since |l-s|<=j<=l+s then j1=1/2 and j2=1/2...
  28. T

    Exploring Spin-Orbit Coupling in Hydrogen Atom

    Hey everyone, I've been reading about the Spin-Orbit coupling effect in the Hydrogen atom. However, there's something I don't quite understand. The effect is being explained and calculated like this: we move to the rest frame of the electron, in which the electron has no orbital angular...
  29. I

    Can increasing the potential width α decrease the coupling constant λ?

    Hi, I'm studying a theorem that is valid for a small coupling constant λ in the Schrodinger operator below -\frac{d^2}{dx^2}+\lambda V The potential has a parameter α which defines its width. My question is: Starting with λ=1 and α=1, can I claim that if I increase the value of α (α >> 1)...
  30. Y

    Hamiltonian with position spin coupling

    I am solving a Hamiltonian including a term \begin{equation}(x\cdot S)^2\end{equation} The Hamiltonian is like this form: \begin{equation} H=L\cdot S+(x\cdot S)^2 \end{equation} where L is angular momentum operator and S is spin operator. The eigenvalue for \begin{equation}L^2 ...
  31. K

    Waves in periodic structures - Coupling of evanescent waves to propagating waves

    Hi, On a surface evanescent waves are created when total internal reflection occurs. However when this surface has periodic structures of appropriate periodicity (gratings, photonic crystals) the evanescent waves are "freed" from the surface and they propagate to the surrounding media. I am...
  32. K

    Waves in periodic structures - Coupling of evanescent waves to propagating waves

    Hi, On a surface evanescent waves are created when total internal reflection occurs. However when this surface has periodic structures of appropriate periodicity (gratings, photonic crystals) the evanescent waves are "freed" from the surface and they propagate to the surrounding media. I am...
  33. A

    Weak force and axial vector coupling

    Hi physics forum, I have been reading David Griffith's book "intro to elementary particles" and he describes the decay of the pi-meson as "pure axial vector" Can someone tell me what this means, in terms of the weak force vertex consisting of this factor γu(1-γ5) Thanks, Mark
  34. 5

    Is the value of K^2 (Electromechanical coupling) the same in both directions ?

    I want to know for a project for school if the value Electromechanical coupling coefficient of piezoelectric material will be the same in both directions? (from machanical to electric and from electric to mechanical) So in formula from: Em=Ee * K^2 and Ee=Em * K^2 and not something...
  35. M

    Choosing a Shaft Coupling for Motor-Gear-Wheel Connection

    Hi guyz, I need some help in choosing the shaft couplings to connect the motor to the gear and from gear to the wheel. The motor shaft is 11 mm and the gear shaft is 24 mm. (Max torque 2 Nm, Max speed 70 rpm) Output of the gear shaft is 32 mm and the wheel shaft is 30 mm. (Max torque...
  36. M

    Inductive coupling & wireless power transmission

    I'm considering a very simple method of powering a small electronic device from a typical current carrying outlet. I'm trying to make a theoretical prediction to the amount of current I could generate using magnetic induction. Problem: I have a straight current wire carrying an...
  37. Z

    Evaluating double integrals for bending-torsion coupling constants

    I've been trying to compute the bending-torsion coupling constants for a wing, B1, B2 and B3. The expression for this is \begin{bmatrix} B_1 \\ B_2 \\ B_3 \end{bmatrix} = \iint (y^2 + z^2)\begin{bmatrix} y^2 + z^2 \\ z \\ y \end{bmatrix}dydyz where x is in along the wingspan direction, y...
  38. N

    Why dimensionless coupling in nonlinear sigma model corresponding to temperature?

    Please teach me this: In QTF theory book of Schoeder say: In nonlinear sigma model L=\intdx\frac{1}{2g^{2}}(\delta _{\mu}n^{\rightarrow})(consider2<d<4 where d is the dimension number of spacetime).If we consider the Lagrangian as the Boltzman weight of a partition function,then the...
  39. M

    Quantum mechanics and Minimal coupling of Dirac field

    Hi I have a simple question: We know from non-relativistic quantum mechanics that the spin of an electron couples only to the magnetic field, i.e. it processes around the magnetic field. How is this resolved in the relativistic context where it would seem that the spin should couple to...
  40. Q

    Understanding the SU(5) Model: Deriving Equations and Solving Mysteries

    I was reading a gauge field theory book and was told to refer to Quigg's Gauge Theories of the Strong, Weak, and Electromagnetic Interactions ch 9.2 The SU(5) Model, so I did not start from the first page of Quigg's book. In page 277, he started from Q = T3 + K To, where T3 is a generator...
  41. L

    Coupling neutronic and thermal hidraulics

    I am on the last year of my study in nuclear ( engineering bachelor degree ). I will make a software that can coupling neutronic and thermal hidraulics in my thesis But i still confuse in case of choose the basic of software to make it because to handle Coupling neutronic and thermal...
  42. I

    Fibre Misalignment and Light Coupling

    Hi, I have got a single mode fibre (SMF) with core diameter 8.4 microns. Fibre is aligned in front of horizental reflective surface at a distance of 500 microns. Light from SMF make a spot size of 24 microns and is reflected and coupled back into SMF. However, if I tilt the reflective surface...
  43. M

    Engineering Induction Motors, Generators, Magnetic Field Strength, Force and Coupling

    Homework Statement Here are a bunch of questions that I've attempted. I feel fairly confident with my answers, but I just wanted to make sure :) Thanks! a) calculate the synchronous speed, amount of slip and the percentage slip in a typical aircraft a.c., four pole, 400hz induction motor...
  44. G

    Coupling Using Theta as a Boundary

    Suppose I have a mass M_0 (here denoted with lowercase zero because of previous discussions on relativistic mass), and I have a gravitational field \phi which can under make a shift of 180^o between a negative plane and a positive plane. Assume also that the mass is considered as a charge...
  45. J

    Number of bolts required for a flanged coupling?

    Hi everyone. This question is giving me a real headache (literally). It should be simple, but I’ve spend probably the last 4-5 hours trying to figure it out. The left side of my brain is redundant. Homework Statement The following specifications are used for the design of a flanged coupling...
  46. T

    Coupling multiple engine onto one drive shaft

    I’ve been searching high and low for an answer to this question. What actually HAPPENS if two engines were to power one drive shaft? I heard back in the days that cars were built this way to break speed records, and I heard present day it is used in tractors, but what increase. My question...
  47. K

    Minimal coupling non minimal coupling

    Hello, I am searching for a text that talks about various non minimal coupling, why and how we introduced it. I know we can use it in inflation, modified gravity, or low energy quantum gravity, but I don't know how all these different topics lead to the same formalism, or almost for example with...
  48. K

    Proving Lagrangian EOM with Non-minimal Coupling

    Hi, I am currently in training and while deriving the EOM for a specific lagrangian I am having difficulties to prove thatg^{\mu \nu} \delta R_{\mu \nu} B(\phi) = (\nabla_{\mu} \nabla_\nu - \square B g_\mu_\nu) I am ashamed it might be a simple calculus but I don't see how. If you had just...
  49. T

    Second quantization derivation of spin-orbit coupling.

    Can anyone recommend books/reviews that derives the spin-orbit coupling in second quantization. I am working on a tightbinding model and I should be able to convert the spin-orbit hamiltonian from k-space to atomic representation using Warnier states, but I can't figure out some of the aspects...
  50. R

    Coupling DC Motors with Timing Belt: Vibration Concerns?

    Just a short question. As part of a dyno project, I am coupling two dc motors together with a timing belt. To allow the same rig to be used for different test motors, I am considering mounting this (test) motor on a table, which can be positioned in two directions on leadscrews. This would...
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