Vibration Definition and 429 Threads

  1. D

    Vibration Formulas: Frequency, Amplitude & Acceleration

    What are the relationships between frequency, amplitude (double) and acceleration?
  2. H

    Disc Material and Vibration: Which Causes Higher Vibration, Iron or Aluminum?

    Hi all, I´m sorry for my sort of trivial issue to solve. Anyway, imagine two discs rotating at the same rpm. They are the same size - same radius, same thickness. The mass is ideally distributed around the axis, so there is originally no disbalance. One of the disc is made of iron, the...
  3. A

    Optimizing Vibration Control for Off-Road Vehicle Roll Cage Attachment

    I am designing a plate that will attach to the roll cage of my off-road vehicle. The plate will be supported on each end by the frame. I want to make sure that vibrations from the engine do not cause the plate to oscillate out of control. How do I calculate this out?
  4. N

    Undamped 2 DOF vibration. What should the eigen vectors be here

    Normal modes of vibration, two masses, two spring, arranged vertically with m2 at the top, m1 underneath arranged (top to bottom) m2, k2, m1, k1, rigid support I have solved the first part of an undamped coupled spring problem to give m_1m_2 \omega ^ 4 + ((m_1+m_2)k_2+m_2k_1)\omega ^2...
  5. N

    Free Vibration of Spring system with two DOF

    In some questions I am doing, you set of a pair of simultaneous equations and in the notes we have that . For a non trivial solution of X1 and X2,the determinant of coefficients of X1 and X2 must be zero. An equation might typically look like this (m \omega^2 +k_1)x_1 +k_2 x_2=0 Why must...
  6. M

    Amount of photons released during decrease of energy of vibration

    An atom has the following energy of vibration: E= nhv. n can only be in the range of whole numbers. So if an vibrating atom changed energy, say from 6hv to 2hv, it means that 4hv of energy is released in light/photons Does that mean that 4 photons are "released" by the atom (?), because...
  7. Y

    Vibration profile calculation for shaker table

    Hi guys, I hope we got some expert out here for vibration profile problems. I have a device that need to be on a shaker table but I need to "find" its profile to see if the shaker table can actually run this experiment. The Shaker table is Unholtz-Dickie system SA30-560B and I have data...
  8. micromass

    Classical How Does Vibration and Waves Enhance Understanding in Physics and Engineering?

    Author: George King Title: Vibration and Waves Amazon Link: https://www.amazon.com/dp/0470011890/?tag=pfamazon01-20
  9. G

    Is Frequency Vibration in Electromagnetic Waves?

    When presented with different phenomenons it can be hard to imagine the relationship between each other. Although I am able to work out different problems involving it and sometimes provide good arguments around it I haven't yet gained enough confidence on how to imagine frequency. Is...
  10. D

    Vibration Experiment. Equipment and Setup

    I am trying to set-up an experiment to measure vibrations on different surfaces and how connected surfaces react; I need some advice on the correct equipment and how to set-up the experiment. I need between 3 and 5 vibrating pads, these need to be approximately 10 to 30 mm diameter and be...
  11. B

    Natural Vibration of Beam - Algebraic Query

    Folks, Just wondering what the author is doing here, given ##\displaystyle \left (\frac{2EI}{L^3} \begin {bmatrix} 6&3L\\3L&2L^2 \end {bmatrix} -\omega^2 \frac{\rho A L}{420} \begin {bmatrix} 156&22L\\22L&4L^2 \end{bmatrix} \begin {bmatrix} W\\ \theta \end {bmatrix} \right )=\begin...
  12. B

    Where Did the Exponentials Go in Beam Vibration Analysis?

    I am just wondering the author is doing in this calculation step. Given ##\displaystyle \rho A \frac {\partial^2 w}{\partial x^2} - \rho I \frac{\partial^4 w}{\partial t^2 \partial x^2} +\frac {\partial^2 }{\partial x^2}EI \frac {\partial^2 w}{\partial x^2}=q(x,t)## where ##w(x,t)=W(x)e^{-i...
  13. F

    How to transform non-linear frequency vibration to constant frequency?

    How to transform non-linear frequency vibration to constant frequency of vibration of 2 Hz? Such as transform the different frequency of waves to constant frequency and then maintain it..
  14. B

    Vibration: find the stiffness of the spring

    Homework Statement a machine of mass 100 tonne generates a simple harmonic disturbing force when operating at a speed of 200rpm. to protect the floor and surrounding machinery it is proposed tp mount the machine on helical springs so that the transmissibility ratio is reduced to 0.1 Q1...
  15. D

    Energy of a Hydrogen Flouride molecule in normal mode vibration

    Homework Statement Hi everyone! first post here :) Basically, the question is as follows: Consider a hydrogen fluoride molecule (atomic mass of H is 1g/mole and of F is 19 g/mole). 1. Write the energy of the system in terms of the displacements of both atoms. There are other questions...
  16. nukeman

    Some questions about Vibration and Quantum Physics(Pretty simple I think)

    Hey all! Does vibration create a wave or a disturbance? If I have something like a particle or something more massive like a molecule, and it vibrates, does it create a wave function? If you have a stadium of people (yea I know, silly example) and one line of people start a wave or...
  17. A

    Atom Vibration: Temperature & Conservation of Momentum

    I know this question is probably fairly basic but I had a hard time finding an answer on google. Does a single atom vibrate/jiggle/oscillate if it has a temperature (ie is not at absolute zero)? Is this vibration random in direction? If it is random, wouldn't this violate the law of...
  18. Y

    Is my stepper motor causing vibration on my wooden plate?

    Hi everyone, For a project I'm working on, I'm mounting a stepper motor against a wooden, round plate. This wooden plate is again fixed on a table. The stepper motor is fixed to the wooden plate using 2 metal brackets. The stepper motor itself drives a round object of about 0.4 kg that is...
  19. C

    What is the Role of Springs in Guitar Vibration?

    Hi all, I have a bit of a practicality problem here I was hoping I could get community consensus regarding. This question revolves around vibration throughout a mechanical setup and I haven't exactly studied said topic in any sort of depth in my schooling yet (coming up winter quarter)...
  20. J

    Equation of motion: spring mass system - free undamped vibration

    Homework Statement i have uploaded my question. please check out the attached .pdf file. Homework Equations The Attempt at a Solution
  21. V

    Chemistry Full Excitation of Molecular Vibration Modes

    Homework Statement Given the relationship Cp/R as a function of Temperature, approximate the number of fully excited vibration modes at a given temperature for a given molecule. 2. The attempt at a solution I have looked through several textbooks and many web sites, but I can't find this...
  22. P

    Force Vibration Music Instrument: Increase Vibration w/out Electricity

    I am working on a forced vib project involving a musical instruments I am trying to have the vibration of my classical acoustic guitar increase, however NO ELECTRICITY CAN BE INVOLVED, and also trying to make the vibration of a piece of tightly folded aluminum that is attached to my guitar to...
  23. R

    Engineering Mechanical vibration -> proving a larger motor will vibrate more

    Homework Statement I have a task of essentially proving that bigger motor = bigger vibration. I have certain data such as the running speed of the motor (), moment of inertia of the rotor, weight of the motor and shaft and the diameter of the shaft. Homework Equations |X| = \frac{me}{M}...
  24. Y

    Calculate Vibration Amplitude, Frequency Range for Derrick Drilling

    I have a steel drilling Derrick 240 feet high mounted central to a ship, this is used for drilling for oil. Calculations have been done on the Derrick in regards to reaction forces in different modes of operation(drilling, transit etc). I need to do a vibration analysis of different points on...
  25. B

    General procedure for finding stiffness in vibration problems

    Hi, I have forgotten quite a bit of my vibration studies, so I have a fairly basic question. Essentially, when you want to find the natural frequency of a single dof system, you use ω=√k/m. However, does anyone know a general procedure (not problem-specific) for finding "k" that is applicable to...
  26. S

    How is the natural period of vibration obtained experimentally?

    Hi, I had been reading the book on 'Dynamics of Structures' authored by Prof.Anil K Chopra of University of Berkeley. In his book, the author has provided the natural period of vibration of some buildings like: 1) Transamerical building of San Francisco- California which is 2.90 seconds...
  27. M

    Comparison vibration level of nylon and pvc pipe

    Homework Statement comparison nylon and pvc pipe which one vibration level is higher ? depend on which material properties ? Homework Equations The Attempt at a Solution
  28. S

    MHB Troubleshooting Damped Free Forced Vibration Solutions

    Something i am doing is not adding up. I don't understand the part with the external force. here's the question: Show that the solution for the damped free forced vibration given by is when , where something along the way I'm doing wrong, because not for heck can i get that fraction with...
  29. F

    Analysis of Fatigue due to random vibration

    Hi! I'm trying to find a good way to predict fatigue caused by a random vibration (given PSD). I know at least 2 ways of doing it but I'm questioning them both. One of them is using the rain flow count algorithm at a simulated acceleration/time signal to generate a certain amount of...
  30. B

    Thermodynamic energy of vibration

    I have read that every body possesses some energy of vibration due to the thermodynamic character and it is equal to 1/2 kT. Does this mean that we can detect the vibrations of bodies? Or ,as it is, does it ultimately end up as heat? Regards, Boltzmann2012
  31. M

    Comparing Vibration Levels of PVC & Nylon Pipes

    Homework Statement i want to check out which material of pipe vibration level higher . comparison between pvc pipe and nylon pipe. nylon pipe is more soft and flexible than pvc pipe. which one vibration more ? Homework Equations The Attempt at a Solution
  32. A

    Finding Modes of Vibration in ANSYS

    Hi, I'm playing around with ANSYS to find the modes of vibration of a structure. How do I know which are the most important modes? I understand that there are infinite modes of vibration - getting higher and higher in frequency. I'm guessing that it has something to do with the effective...
  33. R

    Frequency response mode of vibration

    I'm working on an analysis problem using Abaqus. I would like to compare my results with an exact equation. My problem is modeled as a simply supported beam with a lumped mass at the end. The equation that I'm using for the exact solution is as follows: k=3EI/L3 ωn=\sqrt{k/(M + 0.23m)} How do...
  34. K

    Control and Vibration of mechanical systems

    Homework Statement So I have this question given to me, basically there is a aero simulator which makes the ground shake so the data logger gets false readings, now to solve this problem a vibration absorption system has been added. Please see the attached System A.png file for the complete...
  35. K

    ANSYS Workbench - How to obtain vibration data/magnitude?

    Hi, i am currently doing a simulation of rotating propeller using ANSYS Workbench v13. May i know how to obtain vibration data? coz i only able to obtain stress, strain & etc for solution.. I am currently using static structural analysis only. Do i have to use random vibration analysis?
  36. V

    Modal vibration analysis of 2 beams in ansys

    Hi, My problem is that I have 2 cantilever beams (rectangular cross section beams) placed next to each other. I want to do the modal analysis for 15 modes using ansys for these 2 beams and I also want to know how each beam is intercting with each other.CAn anyone tell me how to do this. you can...
  37. fluidistic

    Characteristic vibration frequencies of a system

    Homework Statement I'm trying to solve an example in Boas's book (Mathematical methods in the physical science page 423) but by using Goldstein's (Classical mechanics) method. The mechanical system consists of 3 springs (with constants k) and 2 masses (with mass m) this way: |----m----m----|...
  38. B

    Change guitar string tension and vibration

    Change in guitar string tension - Please help? Homework Statement A particular guitar string is supposed to vibrate at 220 Hz, but it is measured to actually vibrate at 225 Hz. By what percentage should the tension in the string be changed to get the frequency to the correct value? Do not...
  39. A

    Can Steel Replace Concrete Plynths for Vibration Absorption in Motor Support?

    Hi, So I'm on a work term during a semester off at school (Mechatronics), and have been asked to see if it is feasible to replare some concrete plynths with steel. These are used to support a motor and, possibly, some excentrically rotating masses. My problem is that I don't really know...
  40. F

    Can anyone offer advice on vibration in machine tool?

    We have a vibration from a transmission that is showing up in some machined parts. We know the transmission needs to come apart but will need to schedule it for this summer. Has been this way for years. We need to find a quick remedy to at least reduce the problems. Transmission already sits...
  41. E

    Vibration problem given Force,length and mass

    Homework Statement A flexible wire 80 cm long has a mass of 0.40g. It is stretched across stops on a sonometer that are 50cm apart by a force of 500N. The wire may vibrate at the following frequencies except one. WHich one? a. 4000vib/s b. 1000 vib/s c. 3000 vib / s d. 1500 vib/sHomework...
  42. O

    To find out mode of vibration of air in a resonating pipe

    Homework Statement A cyclindrical pipe of length 29.5 cm closed at one end resonates with a tuning fork of frequency 864 Hz. Then mode of vibration of air in the pipe is(Velocity of sound in air=340m/s): The attempt at a solution V=Velocity, n=Frequency If l1 is the first resonating...
  43. B

    What is the most general solution for a 2-DOF system?

    Hi all, I have a question about Multi DOF vibrating systems. For free vibration of undamped MDOF systems, we have the equations of motion as : M \ddot{q} + K {q} = {0} (1) Where, M - n x n mass matrix K - n x n stiffness matrix {q} - n x 1 vector of generalized coordinates Most vibrations...
  44. N

    How would you test large vehicle for sinusoidal vibration

    Hey, could anyone explain how you would preform a sinusoidal test on large vehicle (weight>40 tons). I have a graph from sinusoidal data, but i don't understant how they were able to obtain this information because there is not a powerful enough testing device.
  45. N

    Can Vibrational Frequencies Weaken Water Bonds to Enhance Electrolysis?

    Is it possible to weaken the bonds of H2O with by inducing a specific vibrational frequency? This idea had been rolling around in my mind for years. My thought is that if the bonds could be weakened by less energy then electrolysis alone it may become economical. I realize that some research is...
  46. S

    Vibration analysis of a structure with cyclic symmetry

    Lets us say we are doing a vibration analysis of a structure with cyclic symmetry In very brief (as pointed out by AlephZero in one of his excellent reply) the whole motion can be represented by complex numbers which describe the motion of one segment. Now, my question is: 1)Is it...
  47. S

    Quantum Physics Definition of Vibration for Abstract Art Research

    Homework Statement [FONT="Book Antiqua"]I wonder where can I find the definition of vibration if it was defined in quantum physics. I need it for my art written work, for Abstract artists - pioneers of modern art were researching vibration through Theosophy teachings and I would like to offer...
  48. A

    Forced Vibration with changing amplitude

    Homework Statement I have a damped forced vibration problem. Most problems I have dealt with have a constant amplitude sinusoidal force such as F_0sin(wt). Let's say you have an applied force that decreases each second at a constant rate over 11 seconds. It looks like this...
  49. A

    Forced vibration with decreasing force amplitude

    I'm working on a problem that has forced vibration. The force, every time it is applied, is less than the previous impact. For clarity, the problem is dealing with a mining skip that is emptying. The inside of the skip is separated in sections using ribs but the top blocks still exert a force on...
  50. A

    Forced vibration with decreasing force amplitude

    I'm working on a problem that has forced vibration. The force, every time it is applied, is less than the previous impact. For clarity, the problem is dealing with a mining skip that is emptying. The inside of the skip is separated in sections using ribs but the top blocks still exert a force on...
Back
Top