Questions tagged [waves]
32 questions
8
votes
2 answers
Vertical wave action on bridge
Rio de Janeiro, Brazil is currently stunned by the fact that yesterday a span of a brand new (innaugurated in January) bicycle bridge along the coast collapsed when struck by a wave, killing some people that were on it at the time.
A few videos have…
Wasabi
- 13,167
- 8
- 39
- 62
6
votes
2 answers
What device is this, and how does it work?
There is this device I saw when I was a child at a big music store, that makes me curious.
It was meant to listen some CDs to try them out before the purchase.
You stand under a bell-shape kind of "speaker" to hear the music, but as soon as you step…
Zorgatone
- 163
- 6
3
votes
7 answers
What can be the reason of the constant 50 Hz sound in my home?
I am suffering from a strange hum in my home. I have just bought my home and living in 3 months. A month ago I've started to hear a humming noise. Then, I recorded the sound and looked at its frequency response. The peak was at 50 Hz. After a while,…
Ufuk
- 31
- 1
- 2
3
votes
1 answer
What is the difference between the wave equation and the advection equation?
I am trying to understand what is the difference between the wave equation ad the advection equation? Bot the equation seems to move a quantity. While in literature it is said that the advection equation is the simpler of the two I don't see how the…
GRANZER
- 337
- 3
- 16
2
votes
1 answer
Generating 10 GHz Frequencies with Reasonable Power Requirements
Is it possible to generate 10 GHz frequency RFs at 400 V amplitudes while only using 10-100 W order power? I tried looking up how 10s of GHz frequencies are generated online and found next to nothing except communication products that had no spec…
Sophia
- 55
- 3
2
votes
0 answers
How do you estimate the energy of an impact?
I am trying to determine the energy of elastic stress waves generated in a solid by an impact. I have a time domain waveform from a piezoelectric transducer that was placed next to the impact site, as well as the voltage/displacement calibration of…
Vishnu Venkatesh
- 21
- 1
2
votes
2 answers
Is it possible for a microphone/sensor to detect soundwaves before it physically reaches the sensor?
I'm sorry if this is the wrong place to ask. I understand that for typical microphones, the sound waves need to physically reach the microphone and cause vibrations in the diaphragm before an electrical signal can be created.
My question is, is…
Ymi
- 121
- 1
1
vote
0 answers
How do I set Reciprocating and Rotation motion in Fluent or CFX?
I want to model the following case(Attached picture)
This case have reciprocating and rotation motion. Is it possible that this case models in Fluent or CFX without writing Code?
How i set this reciprocation motion in CFX? Is it possible that give…
user19061
- 899
- 10
- 14
1
vote
1 answer
which material allows ultrasonic waves to pass through it?
I am currently working on this project for my internship where i need to study the flow of a fluid that flows on a curvy rotating surface. Since this surface is rotating, to study the velocity I could not install a pitot tube so I thought of using a…
Naya Nasr
- 11
- 1
1
vote
1 answer
Designing a siren to vary pitch with port width/pattern. Advice needed
Background: I am trying to design a multi-pitch port siren with one central shaft at 3300 rpm. I've calculated the number of ports needed for each frequency to be n = f(60/rpm). This approach gives me fractional n for many values, which I want to…
Jordan Iversen
- 11
- 1
1
vote
1 answer
What causes wavelength technologies to have longer range than other despite having the same frequency?
Z-Wave operates at 868MHz (in EU) and has up to ~100-meter range
LoRa operates at 868MHz (in EU) and has up to ~15 km range
My knowledge says that the lower the frequency = the higher the range/penetrability.
However, both these technologies…
Jazerix
- 113
- 4
1
vote
1 answer
How is light guided by a perfect mirror waveguide for angles not exactly at the guided mode angles?
Take the below image for example:
Let's imagine the cladding is really just perfect mirrors, where all light energy is reflected back towards the core. I understand that modes arise by imposing the condition that round-trip (two bounces) light must…
banjoeschmoe
- 23
- 2
1
vote
0 answers
Solution to wave equation in a stretched string with one end fixed and the other subject to periodic input
I have a uniform string of length $L$, linear mass density $\mu$, subject to tension $T$. It satisfies the wave equation:
$$\frac{\partial^2 y}{\partial t^2}=c^2\frac{\partial^2 y}{\partial x^2}$$
where $y(x,t)$ is its displacement and…
JP19774028
- 31
- 2
1
vote
3 answers
How to generate a repeating semi-circle waveform using a mechanical linkage
How can one, in a smooth way, produce a semicircle wave, as opposed to a sinusoidal wave ?
Imagining the machinery and linkages behind the movement.
I mean the trace. For example a point fixed in wheel of a car may engender a cycloid. Others curves…
mitchi rodri
- 11
- 3
1
vote
1 answer
Ripple tank simulation for simulating light waves?
Can anyone help shedding some light on how ripple tanks are programmed? example I'm looking to simulate light waves, to perform theoretical calculations, as opposed to for just visual effect. The ones I've found lack the ability to set a specific…
