Electronics > Beginners

How much can be reverse engineered from sound ?

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james_s:

--- Quote from: T3sl4co1l on May 21, 2019, 02:39:00 am ---No need to qualify the statement -- you just won't.  They're hard pressed to win any further gains in efficiency, as it is; even with highly cost-effective and efficient manufacture and charging (say, cheap materials and hydro power, I guess?), the fact remains that, a theoretically perfect battery (perfect in terms of what's on the Periodic Table) is, at absolute best, only just competitive with fuel.  (And the best pair the Periodic Table offers, are not cost-effective elements.)  And indeed, as mentioned, doesn't benefit from the rocket equation (weight falls over time).

--- End quote ---

Well there are other theoretically viable methods of producing thrust that are not internal combustion engines. Fuel cells and steam turbines come to mind. I'm not suggesting either of these are the future by any means, simply that they do not require violating the known laws of the universe. There was at one time serious exploration into the concept of nuclear powered aircraft, this could probably be accomplished using existing technology aside from the obvious safety issues.

David Hess:

--- Quote from: james_s on May 21, 2019, 12:11:17 am ---They'll be around for a long time on aircraft, especially turbines. You're not gonna see an electric jumbo jet without a drastic new development in energy storage tech. Liquid fuel has a very big advantage in that the craft gets lighter as you burn it off.
--- End quote ---

This is especially the case with aircraft where if batteries are used, the entire mass of the batteries has to be carried for the entire flight.  Fuel only has to be carried until used.

Alex Eisenhut:
Cars are pretty weak when it comes to sound and acceleration compared to this madness



0-60 in just over 0.5 seconds

after 3 seconds, 240 mph

Mr. Scram:

--- Quote from: floobydust on May 18, 2019, 05:24:59 am ---Some car makers actually hire sound engineering firms to do the exhaust design, to make the sound unique and have signature harmonics.

Automobile exhaust systems are resonant systems. The exhaust manifold, main pipe, resonator, catalytic converter, muffler - all can be modelled using electrical equivalence i.e. RLC properties. A cylinder fires, a pressure wave propagates down the pipe and can "tug" other cylinder's pressure pulsations.
To get good scavenging with minimum back pressure, and a resonance matching the engine's needs to get a flatter or peaky power curve is the goal.

--- End quote ---
I hate to break it, but many car manufacturers nowadays use the audio system to boost the exhaust sound. That's more flexible and makes it a lot easier to pass regulations. Some cars even allow you to set different profiles and have a differently sound of choice.

Mr. Scram:

--- Quote from: Alex Eisenhut on May 22, 2019, 02:35:36 am ---Cars are pretty weak when it comes to sound and acceleration compared to this madness



0-60 in just over 0.5 seconds

after 3 seconds, 240 mph

--- End quote ---
Apparently top fuel dragsters can match or beat that.

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