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OpenWave #9 : Measuring significant wave height in the frequency domain

Shane Ormonde3 years ago3 years ago63 mins

  The last post looked at two time domain measurements of significant wave height, the highest 3rd calculation and the 4 times the standard deviation measurement. It turns out that the standard deviation measurement can also be made in the frequency domain. This is because the variance of a time domain signal is equal to…

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OpenWave #8: Calculating significant wave height

Shane Ormonde3 years ago3 years ago06 mins

There are multiple ways of calculating significant wave height (Hs). According to wikipedia, the original definition was the average of the highest 3rd of waves. What this means is you would measure wave heights(trough to crest) for a set period, order that dataset from lowest to highest, take the top 3rd of the values and…

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OpenWave #7 : Displacement measurement results – peak detect vs zero crossing

Shane Ormonde4 years ago4 months ago42 mins

This post will detail an experiment in which the wave sensor was attached to a rotating arm at three different diameters. These diameters were 40cm, 60cm and 80cm. For each diameter, measurements were taken at two speeds to get an idea of how rotation frequency affects measurement accuracy. This gives a total of 6 sets…

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OpenWave #6 : Getting vertical displacement working

Shane Ormonde4 years ago3 years ago04 mins

Post #5 outlined the steps used to go from vertical acceleration to vertical displacement and how the results were completely off. The reason why each of the displacement graphs at the end of the post look so totally different just by changing the integral reset points is because of a negative offset to the velocity…

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  1. Mikhail Grushinskiy on OpenWave – take 2May 28, 2023

    You would also need fast Fourier transform to find out waves frequently to use it as reference point to give…

  2. Mikhail Grushinskiy on OpenWave – take 2May 28, 2023

    You would need wind sensor real-time data. You would need to tilt compensate wind data from real time IMU data.…

  3. Mikhail Grushinskiy on OpenWave #9 : Measuring significant wave height in the frequency domainMay 28, 2023

    I used that article mentioned for keeping double integral from drifting. Third integral is assumed zero in observation matrix for…

  4. Mikhail Grushinskiy on OpenWave #9 : Measuring significant wave height in the frequency domainMay 28, 2023

    I’ve made reference data. Generated it in python. Without noise. With noise. With bias. With noise and bias. And fed…

  5. wattnotions on Making a vibration table using a subwooferMay 25, 2023

    Thanks - All credit for software goes to ChatGPT :D https://media.giphy.com/media/xT5LMI6zd2ODq17Mkg/giphy.gif

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