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. M

    Effect of Spline Coupling on Rotordynamics

    Ok, so we're running a compressor rig powered by an air turbine that keeps breaking. I've been asked to review the rotordynamics for the entire system. Prior to my employment, the compressor shaft itself was evaluated, however they want the effect of the turbine and the spline couplings to be...
  2. N

    Weak coupling strength constant

    When it is said that the relative strength of weak interaction is \ 10^{-5},what does this mean? On calculation I am getting \alpha_w=\10^{-3} with \ G_F=\ 1.16\times\ 10^{-5} \ GeV^{-2} I had an impression that \alpha_w should be \ 10^{-5}.Which one is correct?
  3. E

    Estimating the Value of Yukawa Coupling g for Neutron-Proton Scattering

    I can't find the value of the Yukawa coupling g, for neutron-proton scattering for example, where the Yukawa potential reads - g^2 exp(-m*r) / r. Can some1 tell me at least an approximate value?
  4. S

    Naive picture of understanding Spin-Orbit Coupling

    I was trying to explain the origin of spin-orbit coupling to a beginning student and I used the following naive analogy: An electron orbiting around the nucleus "sees" the nucleus rotating about itself (the electron) in its own (electron's) reference frame, thus this is like a current loop...
  5. M

    Is Quantum Mechanics Necessary for Understanding Exchange Coupling Mechanism?

    how does the exchange coupling mechanism work that produce the ferromagnetic properties of materials?
  6. H

    Understanding H NMR Coupling Constants: Matching J-Values vs. Peak Alignment

    background: I have a HNMR spectra and I am trying to figure out what is coupled to what. There is a set of 4 doublets where it is know that there 2 sets of coupled doublets. the doublets have j-values of 8.8 @ 8.04ppm, 8.8@ 7.58ppm, 8.4@7.39ppm and 8.4@7.00ppm. While I may have assumed that...
  7. T

    Why does coupling intensity in H-NMR correspond to Pascal's triangle?

    All right, my 1st-year college chemistry class is just beginning NMR, and I really have no clue what's going on. But what caught my eye was how the relative intensities in hydrogen coupling is roughly predicted by Pascal's triangle. Is this because of probability? For a quartet, the number...
  8. S

    Magnetic toroid - coupling to a power line

    I need to obtain a toroid for inductive coupling to medium voltage power lines. The frequencies to be coupled are between 10 kHz and 900 kHz. Bear in mind that at power frequency (50 Hz), the current will be high (up to 100 Amps). Anyone have any idea on a magnetic material that can achieve...
  9. K

    Universal weak coupling hypothesis

    What is Universal weak coupling hypothesis?
  10. B

    Markov Chain Coupling: Can the Sum of Two Markov Chains Form a Markov Chain?

    Homework Statement Now that LaTeX is working again, maybe I can make the problem a little clearer. Let X and Y be Markov chains on the set \mathbb{Z} of integers. Is the sequence Z_n = X_n + Y_n necessarily a Markov chain? Homework Equations Markov property; coupling of Markov chains...
  11. G

    Dirac's Coupling to an electromagnetic field and schroedingers

    hi i just read this article,which discussed about getting the Schroedinger's equation for a particle in a em field by transforming the psi, http://www.vttoth.com/gauge.htm .can anyone please tell me if we can get the dirac's equation for a particle in a em field by transforming the psi thanks...
  12. D

    Engineering Calculating Output Voltage of an Amplifier with RC Coupling Network

    Hi I am struggling to answer this question: The input coupling circuit of the amplifier shown in the figure consist of an RC network, with R = 1 kW and C = 5mF fed by a sinusoidal voltage source of r.m.s. amplitude of 200 mV. Assuming that the input impedance of the amplifier is, at all...
  13. C

    Increase the coupling efficiency of fiber

    I learn that increase of the beam size of the laser before coupling it to the fiber can increase the coupling efficiency of it. Can I know why is this so? Maybe the fiber is of very small diameter, and the focal lens in front of the fiber can't focus all the laser to this small diameter...
  14. X

    Mechanics- tension in a coupling

    Homework Statement A truck that has a mass of 5kg is being pulled up a slope by a string. The truck is also pulling another truck of mass 2kg up the slope with a rigid coupling inbetween the trucks. Ths slope is inclined at 10 degrees to the horizontal. The 5kg truck has a resistance of 8N and...
  15. M

    Wireless power (using resonance induction a.k.a. evanescent waves coupling)

    Hello, I have read a lot of literature in this area and am really confused. I need help. There is a drive today towards increasing the distance over which energy transfer is feasible. Currently, mutual induction is used commercially for a whole bunch of applications, but each of them...
  16. W

    About the spin-orbit coupling in atoms

    i am now reading the book by woodgate: elementary atomic strucure, 2nd edition. on page 62, he discusses the spin-orbit coupling in hydrogen atom, and calculates the first order shift of the energy due to this effect. I have some doubt about his procedure from eq.4.25 to eq.4.27 the...
  17. F

    What are the Practical Uses of Oldham Couplers in Various Machines?

    hello our prof talked about oldham coupler and showed us some animations of how it works, but didn't mention about where and in which machines it is is used, anybody knows some practical uses of oldham coupler and some examples of machines this coupler is used in? thanks
  18. K

    Is There Experimental Evidence for P-d Coupling in II-VI Semiconductors?

    Hello all, I am beginning a study on II-VI semiconductors and I have read numerous theoretical papers that mention the importance of p-d coupling, in particular the need to include the cation d states in the valency in order to accurately predict ground state properties (i.e lattice...
  19. M

    Waveguide loss measurement- endfire coupling

    Hi, I am doing an experiment to investigate the propagation loss in some nanophotonics structures. The laser light is coupled to the input of the DUT chip via a tapered lensed fiber and the output of the chip is go through a objective then a photodetector. The chip is design for...
  20. K

    - gravitational coupling constant value?

    URGENT- gravitational coupling constant value? I urgently need to find a value for the gravitational coupling constant since the only on ei have is from wikipedia. I've looked on the partcicle data group but couldn't find it there. Anyone? Thanks Karnten07
  21. K

    Standard model coupling strengths

    Hi guys, Where can i find the most up to date (accurate) values of the standard model coupling strengths at the mass of the Z boson? Thanks Karnten07
  22. K

    Standard model coupling strengths

    Hi guys, Where can i find the most up to date (accurate) values of the standard model coupling strengths at the mass of the Z boson? Thanks Karnten07
  23. E

    No coupling of Photons with eletric fields

    I heard in the school a long time ago, that photons do not have a coupling with an electric field. Can someone explain it detailed? Does someone have good online literature? Thanks in advance!
  24. T

    Torsion - Coupling connecting two shafts

    Homework Statement There is a coupling attached two two shafts. The shafts have opposing and equal torques on them with a radius, r. Assuming the shear stress in the bolts used in the coupling is uniform, figure out how many bolts would be needed to make the max sheer stress in the shaft equal...
  25. S

    AC/DC Coupling in Oscilloscopes Explained

    What do AC/DC coupling mean in oscilloscope?
  26. B

    How Does a Dielectric Slab Affect Mode Coupling in a 1-D Optical Waveguide?

    Homework Statement We have a 1-D optical waveguide of width 2a (with axis z=0), with a propagating wave (propogating in \hat{z}) in the lowest order mode, approximated by: E(x)=ACos(\frac{\pi x}{2a}) We insert a dielectric slab half-way into the guide such that the slab ends at z=0, it...
  27. D

    Four trains coupling - find speed of resulting train

    Three identical train cars, coupled together, are rolling east at 4 m/s. A fourth car traveling east at 6 m/s catches up with the three and couples to make a four-car train. What is the speed of the four-car train? I have no idea what to do. Please Help...thanks in advance :)
  28. M

    Universal Coupling: What Is It?

    Hello everyone... I am new in engineering and I've given a topic about 'Universal Coupling'. But when do some research with Google, it seems don't have some information about the topic. Is anyone can help me to find some link or information? Is universal coupling = universal joint? Thanks...
  29. K

    Exploring Yukawa Potential with Coupling Constant 0.3

    If I had was given a yukawa potential of the form: \text{YL}[\text{r$\_$}]=\left(\left.g_L{}^{\wedge}2\right/r\right) \text{Exp}\left[-\mu _Lr (c/\hbar )\right] I put the c/h in the exponent to make it unitless, but what do I do about the outside? i'm given the coupling constant is 0.3. Just...
  30. Q

    Coupling the gauge bosons to the Higgs scalars

    At page 52 of 4th chapter in "An Introduction to gauge theories & modern particle physics" by Leader & Predazzi one can find such statement: "We must therefore rearrange (4.2.4) so that we can identify the field that multiplies\frac{1}{2}\left(1+\tau_{3}\right) as gauge boson that remains...
  31. A

    Quantum Physics, when is spin-orbit coupling necessary?

    When considering a simple hydrogen atom, which essentially is an electron moving in a spherical electric field, you don't need to take spin-orbit coupling into account. For larger atoms you do. I don't understand my books' very brief explanation of this. I am thinking that the electron has as...
  32. D

    Can stacking multiple magnets increase their magnetic field strength?

    Can two magnets produce a magnetic field strong than the simple vector sum of their individual fields when near each other? The backstory: I purchased some crazy 1/2" Neodymium (alloy) magnets off ebay. The ad claimed 6.1 lbs/ea ideal maximum pull force. Naturally skeptical, I took out our...
  33. L

    Coupling between neutronic and thermalhydraulic codes

    Hi there, I'm going to couple WIMS & CITATION as neutronic codes with COBRA as an thermalhydraulic code. Please let me know if there is any resources, papers or tips and tricks to do so. Thanks
  34. J

    How Can I Increase the Intensity of Light from a Fiber Optic for CCD Imaging?

    I hope this post in the appropriate forum. I have a spectrograph and a CCD imaging chip that I am using for an optics experiment. The light coming into the spectrograph is through a 10 micron fiber optic. In order put the light on the CCD imaging chip the way I want it, I believe I need to...
  35. A

    Why Don't Protons on a Methyl Group Couple to Each Other in NMR?

    Hey, I've recently started to revise for a spectroscopy test and had a random retardation moment where I asked myself "Why don't protons on a methyl group couple to eachover?" The answer seemed obvious, there all in the same chemical environment and all sigma bonded to whatever substituent you...
  36. L

    What is the definition of correlation and coupling?

    When dealing with system containing millions of particles( for example, charged particles or magnetic particles) with statistical mechanics, I may often see the description or explanation that the certain effect is due to the coupling or correlation of particles. So can anybody give me a...
  37. arivero

    Top coupling = 1 + corrections

    Via http://dorigo.wordpress.com/2008/03/08/top-mass-1726-14-gev/ The yukawa coupling of the top is now measured to be 0.9914 \pm 0.008 Theoretic suggestions about why it is so are welcome.
  38. K

    Is there a relation between GCT and Lorentz invariance?

    I am not sure where to post this question since it involves GR and particle physics but here it goes. I am reading in a book that when coupling a spinor to gravity, one replaces \partial_\mu \psi [/tex] by a covariant derivative D_\mu \psi [/tex] which must transform like a spinor under...
  39. B

    Coupling fermions to a scalar field: Interpretation problem

    Hi all, I have a little problem concerning the coupling of a fermion to CP^N (or better a 2D scalar O(3) model). Its not a mathematical type of problem. I just read on "The coupling of fermions to the three-dimensional noncommutative $CP^{N-1}$ model: minimal and supersymmetric extensions"...
  40. H

    Equal Masses for Complete Energy Transfer in Coupled Pendulums

    Why is it that the two pendulums must have equal masses if complete energy transfer is to take place, assuming the angular frequencies are commnesumerable.
  41. A

    QM: Spin -orbit coupling: Solve [(L.S), L]

    [SOLVED] QM: Spin -orbit coupling: Solve [(L.S), L] Homework Statement Griffiths problem 6.16 Solve the following commutators (he lists a bunch but i can't get even the first one) (a) [(L.S) , L] (b) [(L.S) , S] (c) [(L.S) , L^2] there's a few more, but i think if i get the idea then...
  42. J

    Spin-orbit coupling in a mercury atom

    Homework Statement The problem is to determine which has a more dominant effect on the energy of a given state in mercury, spin-orbit interaction or the Zeeman effect, when the applied magnetic field B is about 2T. Homework Equations As long as the spin-orbit interaction is the dominant...
  43. B

    Coupling in the Ising model

    I was trying to understand why for every spin configuration of a ferromagnetic system, there exists a corresponding isoenergetic state of an antiferromagnetic system. Can I treat an antiferromagnetically coupled 1-D ising model as a combination of two interpenetrating sublattices which are...
  44. N

    Spin-orbit coupling perturbation

    Homework Statement An electron in a hydrogen atom is in the n = 2, l = 1 state. It experiences a spin-orbit interaction H' = \alpha \mathbf{L} \cdot \mathbf{S}. Calculate the energy level shifts due to the spin-orbit interaction.Homework Equations Degenerate perturbation theory. The Attempt...
  45. E

    Engineering Methods used of coupling motors

    Name the methods of coupling motors to drive a load...
  46. F

    Hydrogen Atom Spin Orbit Coupling

    hi guys,could anyone please help with this question? How many levels will n=4 hydrogen atom split into due to the spin orbit coupling? i know J = L + S i don't know if i have understood the concepts properly - i know if n = 1,2,3...
  47. N

    Calculate Shaft Radius for Coupling System, 100rpm Rotate

    Pls help me calculate the shaft radius of a coupling system that's goin to rotate an prespex cylindrical at 100 rpm by a motor... the dia of cylinder is 6 in and its width is 1 in. the material to be rotated is 10 gm s of sand... bulk density if the sand is 3000 kg per m^3...
  48. malawi_glenn

    What are the allowed states when coupling 3 identical bosons?

    Homework Statement Show that when tree identical quadrupole phonons (boson) are coupled togheter, only states with total angular momentum 0,2,4 and 6 are allowed. The Attempt at a Solution I know "how" to do it, but i do not know how to couple three angular momenta. In the case of...
  49. wolram

    Coupling Two Engines: Best Method & Firing Order?

    I have in mind to recreate a Brit v twin (in a fashion) using two single cylinder engines coupled together, as i see it i have three options for the linking method, chain, toothed belt, or gears, gears would be the most (ridged) coupling, the chain and belt would have some flex, the other...
  50. A

    Photon-Ghost Coupling: Quantum Lagrangian Density Analysis

    Hello; By using the gauge d.A+A.A=0 to find the quantum Lagrangian density, I found a term of Ghost-Photon coupling.does it have a physical significance? And why one does not find it in the gauge d.A=0? Thank you.
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