All Questions
Tagged with harmonic-oscillator acoustics
18
questions
0
votes
1
answer
31
views
If a damped mass-spring oscillator is equivalent to a resonant bandpass filter, then in audio signal terms, what is the input signal for both?
Background
I am working on some personal audio processing and synthesis experiments in the sample domain. I posted here about how a resonant bandpass filter with a given $Q$ and frequency $f_0$ is ...
- 321
2
votes
1
answer
37
views
How do the amplitudes of longitudinal wave harmonics in a string vary with excitation (pluck) position?
A very good explanation for the amplitudes expected for each harmonic of an ideal string with a transverse excitation is included here.
The final equation given is:
$$b_n = \frac{2AL^2}{\pi^2\ell(L-\...
- 321
0
votes
2
answers
101
views
Does rhythm create pitch?
As in,
matter (a physical object)
that is vibrating
= a pitch
And secondly
If we calculate bpm with a “tick” which is just indefinite pitched percussion, how does an indefinite pitched beat compare to ...
- 109
1
vote
0
answers
28
views
Sound when hitting a metal pipe: dependence on radius?
There's a fun physics exhibit at the Centrum Nauki Kopernik in Warsaw with various hollow metal pipes of different lengths and radii that you can whack with a small mallet. One section has three pipes ...
- 111
3
votes
2
answers
132
views
Why antinodes must be present at the free ends of an open organ? (Neglecting end correction)
Why cant a node or less than an antinode be present at the free ends of an open organ pipe. What's the logical reason behind an antinode existing at the open organ pipe? When I asked my teacher this ...
- 1,333
16
votes
3
answers
3k
views
How does the string of an acoustic guitar transfer energy to the guitar's body?
I've learned through the answer to this post that the purpose of the soundboard of an acoustic guitar is to match the impedance of air, facilitating the energy transfer from the strings to the sound ...
0
votes
1
answer
85
views
How can I mathematically describe the reflected sound waves in an open tube?
When a sinusoidal sound wave passes through a tube open at both ends, it will get reflected when it reaches the end of the tube. The reflected wave will itself reflect when it reaches the opposite end ...
0
votes
0
answers
66
views
Reflection coefficient for acoustic waves for normal incidence
Suppose I have two mediums separated by a boundary at $x=0$. A wave, travelling from left to right, would get partly reflected and partly transmitted.
Left of the medium, I can write the total ...
- 1,791
0
votes
0
answers
24
views
How does a motor produce two different sounds when rotating at two different speeds?
How are two different rotational speeds from the same motor associated with two different sound frequencies produced, i.e., the higher the speed the higher the frequency? Why?
All parts of the same ...
2
votes
3
answers
2k
views
Phase difference between two waves in opposite directions
Suppose I have two waves travelling along the positive and negative $x$ axis, and are given by : $$y_1=A\sin(kx-\omega t)\,\,\,\,,\,\,\,y_2=A\sin(kx+\omega t)$$
What would be the phase difference ...
- 493
1
vote
1
answer
625
views
Is the amplitude of vibration of all particles equal in a sound wave?
[Assume ideal conditions and simple harmonic wave]
My book showed resemblance in a lot of equations related to both transverse and longitudinal waves although they work very differently.
the ...
- 309
0
votes
2
answers
78
views
Details of sound waves
I am a high school student, and I am very confused about sound waves. My teacher taught me that sound is a pressure wave, i.e the atmospheric pressure varies during the propagation of sound, and all ...
- 470
2
votes
1
answer
832
views
Doppler effect observed on pendulums
I wanted to investigate the doppler effect on pendulums and set up an experiment where:
The bob of a pendulum is a speaker which emits a specific sound frequency.
Directly underneath the lowest point ...
1
vote
2
answers
177
views
Graph of periodic motion due to wave
Wave is a disturbance in a medium, due to this disturbance the particles in the medium oscillate. Due to this oscillation we say that the wave is sinusoidal because the motion of the particle is ...
- 300
2
votes
2
answers
529
views
Question about Speed of Sound
I'm looking over PowerPoint slides of my past Physics lecture and I'm confused about a point my professor made:
The speed of sound is much higher in a liquid or a solid. It turns out that the speed ...
- 43