The vibration tag has no wiki summary.
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Low Frequency Standing Waves in Cylindrical Structures [closed]
What would be the frequency of the fundamental vibration in a 50 meter tall cylindrical structure if it were closed at the bottom?
L = wavelength/4 for closed end cylinders so the wavelength I ...
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33 views
Material physical properties of a desk related to vibration propagation?
I'm a software programmer (not a physics expert) trying out a smartphone vibration detection algorithm on desks, and I want to measure the impact of the desk's material features on the algorithm. Are ...
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1answer
63 views
Phase shift of resonance
For resonance to occur, is it true that the force lags behind the motion by $\pi/2$? I saw some notes written that the motion lags behind the force by $\pi/2$ which makes no sense to me.
As I watched ...
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1answer
45 views
Measuring vibration and converting to force (N)
The test is:
To have a rotating machine, bolted into a factory floor.
To measure the vibration on 3 axis (output of accelerometers can be acceleration or velocity in $\mathrm{m/s}$ or ...
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2answers
128 views
Why is simple harmonic motion called so?
Is the motion of a simple pendulum, a simple harmonic motion? It stops vibrating after sometime.
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6answers
2k views
Why do tuning forks have two prongs?
I believe the purpose of a tuning fork is to produce a single pure frequency of vibration. How do two coupled vibrating prongs isolate a single frequency? Is it possible to produce the same effect ...
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1answer
133 views
What is actually a resonating vibration and resonance?
What is actually a resonating vibration and resonance?
I have searched many books and made Google search too but couldn't understand it clearly.
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15 views
Blocking mass Or Inter layer in terms of noise transmission
I am studying the application of a Blocking mass and Interlayer when placed between to semi-infinite beams or plates,having bending wave propagation,in terms of noise transmission.My question is based ...
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2answers
115 views
Orthogonality of modes
I want to know what it exactly means when it is said the modes of vibration are Orthogonal.I understand what it means mathematically but what is its physical interpretation?
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2answers
258 views
Young's Modulus and Vibrating String Harmonics
I was wondering how Young's Modulus effects the resonant harmonics of a vibrating (string instrument) string. I know that the string's fundamental frequency is $$\frac{1}2 \times \text{Length} \times ...
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4answers
122 views
How come vibrations?
We all know that sound sensation is produced only when sound waves reach upto us. We all know that sound waves are disturbances propagating in air, Vibration is necessary for the generation of sound, ...
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2answers
100 views
Can the vibrational energy of a engine be used to increase efficiency?
In whole mechanics, we never talk about wasted vibrational energy!
As we see in our daily life, a lot of energy is wasted as vibrational energy in every engine, for example as we fire our car's ...
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Physical meaning of Laplace-Beltrami eigenfunctions?
The eigenfunctions of Laplace-Beltrami operator are often used as the basis of functions defined on some manifolds. It seems that there is some kind of connection between eigen analysis of ...
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2answers
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With the phone Vibration why the whole bed vibrates
While we are lying on the bed and there is a phone placed somewhere on the bed, when the phone vibrates we can feel the vibration all over the bed,
but in the scenario when we are lying on the floor ...
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1answer
169 views
Why does vibration loosen screws?
I am trying to figure out why vibrations (say, from an engine) loosen screws. It seems to me that there is evident symmetry between loosening and tightening a screw. I am wondering what breaks this ...
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0answers
89 views
Can I transfer vibration with hydraulics?
I need to transfer vibration to 10 meters. I can do this with solid metal rod, but its making mechanical design complex. So, I am thinking to do it hydraulically (tubes can easily be bend). But, I am ...
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1answer
272 views
Resonance and Natural Vibrations in Vacuum
In my Physics textbook, it says that if two pendulums of the same natural frequency are placed next to each other and if one is set into vibration, the other starts resonating and when the first one ...
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2answers
359 views
Is photon emission possible without electrons changing energy levels?
Does molecular vibrational transition and consequent emission of infrared radiation involve electrons changing energy level? In wikipedia, about vibronic transitions it says "Most processes leading to ...
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1answer
122 views
What theory is the person in this song talking about?
What he is talking about sounds interesting to me, and I would like to know more. But I need to know the name first.
http://www.youtube.com/watch?v=Ogn5FrVGtAg&hd=1
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4answers
300 views
Understanding Heat
Heat or thermal energy as understood is nothing but motion of molecules of the matter. If the molecules are tightly bound (in case of solids), it is to-and-fro molecular vibrations, otherwise it is ...
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384 views
Phenomena which are incorrectly declared as resonance phenomena?
In standard college physics text books, high-school books and popular level physics books, the collapse of the Tacoma Narrows Bridge is often taken as an example of resonance. However a more detailed ...
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3answers
827 views
Design of a common table fan
A few questions about the design of a common table fan, such as below.
Does the round disc (silver in the image) in front of the blades serve any functional purpose?
Does the metal casing around the ...
