Here's the paper (paywall maybe?): https://www.sciencedirect.com/science/article/pii/S0960148123014416 https://www.sciencedirect.com/science/article/pii/S096014

Here's the paper (paywall maybe?): https://www.sciencedirect.com/science/article/pii/S0960148123014416 https://www.sciencedirect.com/science/article/pii/S096014812... "The results show that the concept of heaving oscillator inside ship has no significantly adverse effects on the ship seakeeping performance." Looks like a pretty preliminary study where they are just trying to build a good model.