Recent content by SpecGuest

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    Error in summation of spectral components

    Thank you for this answer. Actually, I did the double check, that was my first step and also the reason why I'm asking here since I was told that the uncertainty was option 1 in my previous post. But it turns out, unless I did a mistake somewhere in my test program, that option 1 is not the...
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    How Thick Should the Concrete Foundation Be to Counteract Buoyancy Underwater?

    You need to estimate what is the positive buoyancy of your pump station. Without this number, how do you want to calculate the amount of concrete needed ? 1300 km/m^3 is the exact answer for concrete apparent density in seawater. This is Archimede :) Once again, you also need to know if there...
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    Error in summation of spectral components

    HI everyone, Imagine we are sampling of a gaussian signal along time and need to know the power/variance associated with the first N spectral components. So we take our favorite fft algorithm to get the PSD. The error associated with a given estimated spectral component f(w) (w is the...
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    How Thick Should the Concrete Foundation Be to Counteract Buoyancy Underwater?

    Hi, I guess the pump has a negative buoyancy in water, so it will stay at the bottom even if there is no concrete. The buoyancy of concrete in water is simply 2300(conctete)-1000(water)=1300 kg m^-3 You may also need to take pressure forces due to currents (if any) acting on the pump.
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