Vibration Definition and 429 Threads

I'm looking for an in depth and comprehensive treatment of the theory of normal modes; any suggestions?

helo guys,i'm new here hope to gain knowledge from this forum.i currently doing a project about design of turbofan engine.now i have to do preliminary stress and vibration analysis for the turbine blade.i'm not very good at stress and vibration and have search the internet about it but couldn't...

Homework Statement A parallel plate capacitor is used as a vibration sensor. The plates have an area of 100cm^2, the dieelectric is air, and the dist between the plates is given by d(t)=1+.01 sin(200 t) mm A constant voltage of 200 V is applied to the sensor. Determine the current...

Homework Statement A vibration platform oscillates up and down with an amplitude of 10.4 cm at a controlled variable frequency. Suppose a small rock of unknown mass is placed on the platform. At what frequency will the rock just begin to leave the surface so that it starts to clatter...

Please could anyone help me on the topic "Controlling the vibration and shocks received by elctronic-mechanical components"?

oscillation question -- vibration topic Book is asking me to prove that ξ = 1 corresponds with the smallest value of c such that no oscillation occurs. Says let λ = -b (b is a positive number) and that's all I'm given. I'm not even sure I understand how you can tell there is no...

hello everyone. can u help me on my homework? here are the questions.. --What physical quantity in a vibration is altered when a speed of sound dies away? --Would you expect the speed of sound in Singapore and Britain to be the same, if each place had the same temperature? Why? thank u...

Hi, Does anyone know how to calculate the vibration in a pipe with water flowing through it? I have no idea where to start or what formula to use. Any help would be appreciated. Thanks.

Homework Statement A tuning fork vibrating at 512 hertz falls from rest and accelerates at 9.81 m/s^2. How far below the point of release is the tuning fork when waves of frequency 485 Hz reach the release point? take the speed of sound in air to be 340 m/s. (don't forget it takes the sound...

Having trouble figuring out these 4 problems. I could use a walk through or an answer. thanks guys. Homework Statement 1a)When four people with a combined mass of 270 kg sit down in a car, they find that the car drops 1.00 cm lower on its springs. Then they get out of the car and bounce it up...

Hi I was doing an exercise of calculating the "natural frequency" of a 3-mass system. The problem is like: A shaft has three inertia on it of 6, 4 and 10 kgm2, respectively viewed from left to right. The shaft connecting the first two is 2.6 m long with a stiffness of 12 x 106 Nm/radians...

I'm looking for some notes concerning the following areas: Vibration in solids, Phonons, Specific heat capacity of solids, Electron gaz in solids, Debye model, stuff like that, any help ?

Hello, I am looking for calculating vibration, can anyone help me with formula David

Hi everyone, I am an undergraduate student of Mechanical Engineering in Jakarta, Indonesia. I’ve found all of these Vibration books in my library: Vibration for Engineers, 2nd Ed. by Andrew Dimaragonas Prentice Hall An Introduction to Mechanical Vibrations, 3rd Ed. by Robert F...

Homework Statement For a mass m hung vertically from a spring with spring constant s, the restoring Force is F=-sx where x is the displacement from equilibrium. a)What are the periods of the two harmonic oscillators i) and ii). b)Assuming eaqch oscillator is moving with the same...

what is the difference between forced vibration and combined SHM. since both include motion of particle under the influence of two periodic force

Hi all. I am taking a course in mechanical vibrations. I know that a mode shape is a pattern specific to a natural frequency of a system. That maens, the mode shape is determined under the context of free vibration, right? What kind of information can we obtained from the mode shape? Is the...

Hi, I am currently in the process of completing my final year mechanical engineering thesis, which compares the dynamics of damped drumsticks (not the chicken ones, the drum kit playing ones!) with those of a conventional, undamped drum stick. I now am up to the point where I need to...

Can anyone tell me what would happen if a "string" (as in the strings in the superstring theory) for some reason had no vibration. Would it cease to exist? Would it just release all of its energy?

Homework Statement A block of mass m is supported by two identical parallel springs, each with spring stiffness constant k. What will be the frequency of vibration? Homework Equations f = 1/[2*pi*sqrt(m/k)] The Attempt at a Solution I am just curious how the fact that there are two springs...

If two metal objects hit, do the objects have to vibrate to make a sound? Or can the air itself vibrate with the sound?

1. The mass of the deuterium molecule D2 is twice the mass of Hydrogen molecule H2. If the vibrational frequency of H2 is 1.35x10^14 Hz, what is the vibrational frequency of D2, assuming the "spring constant" of attracting forces is the same for two species? Answer in unit of Hz. Homework...

Homework Statement A 75 g bungee cord has an equilibrium length of 1.20 m. The cord is stretched to a length of 1.80 m, then vibrated at 20 Hz. This produces a standing wave with two antinodes. Homework Equations Linear Density = m/LThe Attempt at a Solution So far I've only found the linear...

as we know ,the equation to the undamped forced vibration is x=Asin{(w1+w2)/2}sin{(w1-w2)/2},the symbols have their usual meaning..but i can't understand how (w1+w2)/2 comes in picture in the phasor diagram...also its significance

gooooood evening.. i have presentation about the effect of vibration on human and i did not find what i want and i did not understant the topices when i searched from google .. so I will be grateful if anyone could help me..

Should there also be an assumption for ideal gaes that states: The gas molecules/atoms do not vibrate and rotate I was considering a case of a gas expanding at a dropping pressure such that the value of PV remains a constant. Work is done since there is an increase in volume. If there is...

I have had an idea now for a while and am just wondering if the direction along the path of thinking that I am using is followed in any well established theorys. The basis for my thoughts is that mass/particles are ultimately vibrations of that which the vaccume of space consists of...

A string vibrates at its third-harmonic frequency. The amplitude at a point 30 cm from one end is half the maximum amplitude. How long is the string? i figured since the amplitude at point 30 cm is half the max amplitude, the amplitude must be at 60 cm. The third harmonic...

Hello all, I'm having a little trouble researching this as I'm not sure what the exact field of study is called, googling Atomic Vibration doesn't come up with much. Basically I am looking to disprove a theory (with hard science) that thoughts can affect the crystalisation of water. The...

For a project i want to see which viration dampeners would work most effiecently is there any way i could use some sort of invention other then an accelerometer to test this?

Can someone explain to me the physics involved in this? Why does the dampener absorb some of the shock? Where does that shock go? This sort of stuff... Please do explain Thanks in Advance

Generally, when you melt a salt (CaCl2 @800deg C specifically) are the ions disassociated as in a solution or is molecular vibration simply great enough to not allow the formation of intermolecular bonds and the atoms are floating around still paired? This is probably a dumb question and my...

I have a problem on my sheet that is confusing me. The problem states The world's largest guitar, which was built by high school students in Indiana, has strings that are 9.0 long. The fundamental vibration that can be induced on each string has a wavelength equal to twice the string's length...

Hello, I am interested in making a vibration free table to make holograms. The way I was going to do it was to put innertubes under the corners of a box. Then fill the box with sand. I will test it by putting components on the sand to make a interferometer. Are there better ways of doing this...

Homework Statement (a) acceleration amplitude of 100 ms−2 with a vibration amplitude of 5.0 cm. (i) What frequency of vibration is required? (ii) What is the maximum speed ? (iii)What is the time delay between the points of maximum acceleration and of maximum speed? Homework...

:confused: Hi guys,just performed the experiment using the kundt's tube.. I just can't understand why the rod is clamped at midpoint..hmmmmm,what's your analysis on the vibration of the rod clamped at midpoint... thanks in advance..:smile:

A fisherman’s scale stretches 2.8 cm when a 3.7 kg fish hangs from it. a. What is the spring constant, and b. What will be the amplitude and frequency of vibration of the fish is pulled down 2.5 cm more and released so that it vibrates up and down? a) F=ma F=(3.7 kg)(...

When a 63 kg person climbs into a 1040 kg car, the car's springs compress vertically by 3.3 cm. What will be the frequency of vibration when the car hits a bump? Ignore damping. Here is the FBD I have drawn: http://img276.imageshack.us/img276/6189/fbdcc2.png Im not even sure if this is...

EASY STUFF: Impedence, pitch, vibration, reasonance... Please Help! I would really appreciate it if you guys could take a look at these problems I have difficulty with. Thanks a lot. My answers are in red. [SIZE="4"]1. As impedance decreases, frequency decreases? [SIZE="4"]2. For the...

Hi. I would really appreciate it if someone could tell me whether I'm correct or not. :smile: 1. An open pipe (open at both ends) and a closed pipe (closed at one end) are the same length. If an organ blows air across the top of each pipe, what is true of the frequency (and pitch) of the...

Can anyone with a stronger math/physics backround than me prove/disprove this... Attractive and repelling forces which form molecular, and atomic structure (mass) do so because of "musical" harmonies between oscillations. AKA if you plot atomic vibrations as sine waves, do molecular...

My friend brought up this concept somehow and I know the answer, I just CANT remember what it's called. Sounds silly, I know. But anyways perhaps someone here can help me. What causes the vibration of one guitar string to be the same frequency of another one that has been plucked on that...

why is enerygy absorbed if the frequency of the radiation matches the frequency of the vibration?

Sir, Consider a resonance column which is in unison with a tuning fork of particular frequency. Now by varying the length of the air column, resonance is obtained at different lengths. How is this possible? I have this doubt because each length of air column vibrates with a particular...

Considering the free vibration response of a single degree of freedom system: It is observed ,that, larger the Time Period (Vibration Period -"T") of the system(consider a single degree of freedom system), greater is the peak deformation of the system.Right? Time Period on the other hand...

What is the difference between vibration and oscillation?

hello. can u help me with this planing execise manufacturers of sheet metal use rollers to produce the sheets. The sheets then pass along processing lines for painting. Transverse vibrations of these sheets results in a non uniform thickness of paint layers on the sheets. Electronmagnetic...

Hi, I'm looking into the subject of "Chladni plates": http://www.physics.montana.edu/demonstrations/video/3_oscillationandwaves/demos/chladniplates.html For a lecture I'm supposed to prepare, and I'm looking for information on how exactly a two-dimensional surface vibrates under forced...

I interest how can vibration be maked.That is,for example sander.how does the mechanism of the vibration sander functions?is there any idea?:rolleyes:

I am a college student, currently in Physics II. Got a simple question. I didnt have time in lab / I forgot to do this part, and the lab report is due tomorrow. Our lab was on standing waves on a string. Using a string vibrating device, and a hanging mass on the other end to play with the...