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Questions tagged [vibrations]

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272 views

Vibration of strings [duplicate]

What happens if we clamp a string at both it's ends and pluck it at different distances from one of the ends? Will the frequency of oscillation be the same or will it differ based on the place from ...
2
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0answers
150 views

Seismology - PPV / VDV from geophone waveform data

I'm using an inexpensive seismometer to try and measure the effects of local HGV traffic on buildings. The device is connected to a Raspberry PI that has a Cirrus Logic Audio Card. The signal is fed ...
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0answers
33 views

Eigen-Energy of Vibration on a Loop

I recently started this recreational project to find the energy of the modes on a loop. To obtain the eigen-energies $E_n$, I decided to solve the 1D wave equation on a loop of circumference $2\pi l$ ...
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1answer
53 views

How can i slow my molecular vibration so objects can pass through me without injury [closed]

The goverment has already developed it combined with a light refraction suit
5
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1answer
209 views

Does a hollow sphere vibrate longer than a solid sphere?

Assume the following are constant: Surface area of both spheres The spheres are both made of titanium (Ti). Mechanism that strikes a given sphere delivers the same energy per strike. Spheres are ...
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5answers
3k views

Does plucking a guitar string create a standing wave?

About two weeks ago there was a mock test in Korea, and a physics question asked if a plucked guitar (it was actually a gayageum, a traditional instrument, but I'll just call it a guitar for ...
4
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1answer
93 views

Calculating the decay rates for modes of an ideal circular membrane (ie. drum head) using wave equations?

I am attempting to solve for the theoretical decay rates of the various (m,n) modes of an ideal circular membrane, if that membrane is excited momentarily by an impulse or deformation. I would ...
1
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1answer
204 views

Fourier Series Analysis [duplicate]

Can anybody explain this paragraph from the chapter " Fourier series and transform " of the book by M l Boas? "If you strike a piano key you do not get a sound wave of just one frequency . ...
2
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1answer
280 views

What is the difference between the dipole in IR and Raman vibrations?

In order for a vibration to be IR active, there must be a change in the dipole moment ($\mu$) of the molecule, which is given by: $\mu$ = $\sum$ q * r Where q is the charge magnitude and r is the ...
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0answers
37 views

Similarity between the period of a wave and the period of its source

I have studied only some basic stuff on mechanical waves Consider a string attached to wall at one side and you're holding the other side so that the string is taut. What I've noticed is that when ...
2
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1answer
425 views

Why can't resonance occur when an object is forced to vibrate (in simple harmonic motion) with a frequency other than the natural frequency?

As far as I understood forced vibrations, after a point of time steady state is reached i.e. the body oscillates in accordance with the applied force irrespective of the force frequency (may be other ...
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0answers
32 views

Is using an IMU suitable for measuring the vibrations of the string?

I want to measure the vibrations of the guitar string. I've got an IMU sensor. I want to mount it on a string and measure the vibrations of the element. IMU: Sparkfun ITG3200 I'm not pretty sure is ...
4
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1answer
200 views

Is there a physical model described by this equation? (vectorial damped wave equation)

Consider the wave equation $\partial_t^2 u\left(t,x\right) - \Delta u\left(t,x\right) = 0$ where $t\in\mathbb{R}$ is the time variable and $x\in\Omega$ (a nice open subset of $\mathbb{R}^n$) is the ...
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0answers
99 views

Determination of vibration parameters of the damped tuning fork

I have the tables with values of measurement results. Where A0 is the initial value of the amplitude. A is ending value of the amplitude. t is time between starting and ending point. f is frequency ...
1
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1answer
93 views

How to produce the first, second and third modes of vibration in a timpani

For a timpani, when hitting it in the center, how do you produce first, second and third modes of vibration? Second mode has a higher frequency than the first, does that imply do you hit the timpani ...
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2answers
57 views

Why i don't hear the wind, when the ear faces it?

When I ride a bike, a hear the wind with both of my ears. But if I turn my headto the side, the front ear doesnt hear it. Does it have to do with how ear is built, or with eardrums vibrations? Couldn'...
2
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1answer
98 views

What is the meaning of “inverse problems in vibration”? [closed]

I am asking you to tell me or give me a link which I can understand the meaning of inverse problems in vibration. As it is my first experience in facing the Inverse method please give me a hand as ...
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0answers
45 views

What is the shape of the vibration when the system is exited at off natural/resonant frequency?

I understand that when the system is exited and left to vibrate freely many of its vibrational modes will be present as a linear combination. If the system undergoes a forced vibration at one of the ...
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0answers
3k views

What is the difference between Non-harmonic oscillation, Anharmonic oscillation and Complex harmonic oscillation?

I am just wondering if the words Non-harmonic oscillation, Anharmonic oscillation and Complex harmonic oscillation mean the same thing. If not what exactly is the difference between them? Since the ...
-1
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1answer
68 views

Difficulties while trying to apply the Lagrangian approach to a problem with damping

I have tried to use the Lagrangian approach to find the equation of motion for a horizontally driven damped pendulum but my solution seems quite different from the provided answer, here is the problem:...
1
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0answers
57 views

Assumed mode method to solve problems

I am trying to understand part 4 (Approximate analytical solution to pull-in voltage) of this paper, "An approximate analytical solution to the pull-in voltage of a micro bridge with an elastic ...
2
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2answers
221 views

Can you vibrate an object and split its molecules?

Let’s say I have paper (or, I don't know, any other material). Can I with some sort of device vibrate the molecules of those atoms so fast that they separate, and as a result I don’t have paper ...
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2answers
238 views

Difference between Phonons and heat?

1, if these two were the different then how we differentiate with one another?. 2, if these two were the same, then what is really vibrating?, atom in the lattice or electron in the atom or the bond ...
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1answer
39 views

Solutions for forced damping [closed]

What is the real physical meaning of finding the solutions for 2nd order differential equation. Like in forced damping system.
2
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2answers
65 views

Would a string vibrating in an atmosphere that is different from Earth's have a different overtone series?

The overtone series is defined as a set of characteristic harmonic oscillations of a vibrating string. It is a core concept of Western music theory. Are these characteristics a result of the string ...
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0answers
44 views

Uniqueness of principle coordinates

I am currently studying two-degree of freedom systems in mechanical vibrations. I understand that in general, the equations of motion corresponding to the two independent coordinates can be coupled. ...
2
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0answers
483 views

What is the physics behind the vibrating feeling you get when you touched an inducted metal surface?

When I was last working on the highway, I stopped to help a motorist parked under high tension power lines. I'm driving a large Ford Transit van, fairly box shaped. My van was parked 90 degrees (...
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2answers
307 views

Force transmitted to mass through spring [closed]

Consider the following system, where we have a mass $m$ between two springs with constant $k$. A force $F$ is applied to the spring on the left, and the spring on the right is fixed. What is the ...
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2answers
91 views

Vibration propagation

I have a problem in understanding the vibration propagation in an object. Supposing I have an object with an exciter positioned inside it. If I make the exciter runs producing vibrations at a certain ...
0
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1answer
76 views

Are friction and rigidity connected?

On the surface (ha) it appears that very low-friction materials are also highly rigid. For example, many gemstones can be polished to be incredibly smooth, and so can some metals. But none of those ...
0
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1answer
147 views

Infinite string attached to a spring [closed]

I'm trying to solve a problem related to waves on a string. Say I have an infinite string, with tension $T$ and mass density $\mu$. To the string, at $x=0$ (seeing as it's infinite, the specific ...
3
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2answers
507 views

Why do all materials resonate? [duplicate]

Why do things vibrate with resonant frequencies. Why are there multiple frequencies from one impulse? ammendment: Why do chimes from bells have overtones? How to drums have overtones? What is ...
2
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0answers
32 views

Trying to prove, that an initial spatial and restricted displacement on an infinite string, with a density discontinuity, will transmit AND reflect

This is a rather trivia problem, but I have been trying to prove it, since all of the Books I have read - online or not - take it for granted. The problem I'm talking about is "Vibration of String" ...
0
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1answer
54 views

What this sound is doing with water? [duplicate]

I saw a video on youtube with link "https://youtube.com/watch?v=uENITui5_jU" In the video a stream of water is run from a nozzle attached to a speaker diaphragm. The speaker plays a 24Hz sinusoidal ...
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1answer
184 views

How are $R$ and $P$ branches defined in rovibrational transition?

In rovibrational transitions we have following selection rules $$ \Delta v = \pm 1 $$ $$ \Delta J = \pm 1 $$ where $v$ is the vibrational quantum number and $J$ is rotational quantum number. All $...
3
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1answer
61 views

How can a 2.1 Hz excitation induce resonant vibrations in a structure with a fundamental frequency at 6.3 Hz?

I've come across an example given in a footfall design guide wherein it's mentioned that a floor with a fundamental frequency of 6.3 Hz can be excited to resonance by a person walking at 2.1 Hz ...
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1answer
65 views

Does the frequency of an exciting force affect the damping in a structure?

My question stems from my investigations into vibrations induced by pedestrians walking/running on bridge structures. The walking frequency for most people is between 1.4-2.4 Hz and I'm wondering if ...
0
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1answer
159 views

Wing vibration discrete systems problem

I am trying to wrap my head around the energy terms that arise from the following discrete systems vibration problem: The potential energy terms seem simple enough. I include the elastic potential of ...
7
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2answers
184 views

vibrating charged string

I know how to calculate the electric field generated by a charged string at rest. And I know how to calculate the vibrations of a (not charged) string with given boundary and initial conditions. All ...
1
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1answer
111 views

What is 'harmonic likeness'?

While reading about sympathetic vibrations/resonance, I came across the term 'harmonic likeness'. Sympathetic resonance or sympathetic vibration is a harmonic phenomenon wherein a formerly passive ...
-1
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1answer
58 views

How is a source of sound in air set up a sound wave in an elastic medium such as glass?

I asked a question here about breaking a wine glass by resonance. This brings me to another question. How does the sound wave in the air set up an sound wave in the glass? In this case, one does not ...
1
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4answers
68 views

What would happen to an isolated block of material

I was thinking recently about what might happen if you were to place a block of material in the middle of a complete vacuum. Obviously there's not going to be a way to ever achieve such a scenario but ...
3
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1answer
47 views

Qualitative understanding on why solids expand

I'm trying to understand better why solids expand, and what I've been looking at to help guide my understanding is the following graphic from my lecture notes: Now, to illustrate what I think is ...
3
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0answers
47 views

Can I compute mass of an object in a box based on the sound the object makes when shaken? (Barton Fink movie)

In this movie called "Barton Fink" the main character, Fink, is given a mysterious box with an object inside it, he shakes the box up and down, is it possible to calculate the mass of the object ...
3
votes
1answer
67 views

Vibrational modes of a black hole's event horizon

I understand that it is possible for the event horizon of a black hole to support damped modes of vibration called quasi-normal modes, in which it oscillates between spherical and and various oblate ...
1
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1answer
2k views

How may sound waves behave inside the human body?

in Vibroacoustic Therapy (VAT) sound is transferred to skin surface via transducers that are in direct contact with the skin. This means no energy loss to surrounding air. We are mostly using ...
0
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1answer
326 views

Is a bending wave transverse or longitudinal?

A bending wave in a metal bar or string is simply called a transverse wave because the macroscopic oscillation is transverse. However, paradoxically, in a frame co-moving with the atoms, the atoms are ...
1
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1answer
52 views

How does an inverted cup make music in the bathroom?

A partially filled inverted cup immersed in a bucketful of water makes musical notes, when you turn on the tap and let the water fall continuously into the bucket. Whereas no music is made if you ...
0
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1answer
592 views

Why is the amplitude of a forced vibration lower above resonance than below? [duplicate]

Am I correct in thinking that for a given harmonic oscillator, with constant magnitude driving force, the resultant amplitude of the steady-state motion will be generally lower above resonance than ...
0
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1answer
253 views

Varying amplitude of beats

Why is the product of 2X and cosine delta t divided by 2 is the varying amplitude and not the other 2X and cosine function?