tag:blogger.com,1999:blog-6734677694393884321.post7783855292531076413..comments2019-05-22T08:11:46.322+01:00Comments on Wave Power Conundrums: Negative spring is a mysterious thingAllyhttp://www.blogger.com/profile/00449637126649295730noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-6734677694393884321.post-72950921439176871852016-02-08T10:10:20.984+00:002016-02-08T10:10:20.984+00:00Yes, that is a good point Jørgen. It seems that ne...Yes, that is a good point Jørgen. It seems that negative spring is best suited to low mass devices. During a storm, the negative spring can be turned off. The performance curve will go back to having a narrow bandwidth and a natural period lower than the wave periods containing much of the energy. Whereas if you had a high mass device where you tuned the natural period with either positive or negative spring, it would not be so easy to achieve a storm mode that had a narrow bandwidth and low natural period. You would have to reduce the mass for this.<br /><br />Thanks also for spotting the missing 2 pi in the T_n formula (now ammended). Allyhttps://www.blogger.com/profile/00449637126649295730noreply@blogger.comtag:blogger.com,1999:blog-6734677694393884321.post-30913626110940110092016-02-08T09:04:00.287+00:002016-02-08T09:04:00.287+00:00Hi Ally. Very nice explanation of the negative sp...Hi Ally. Very nice explanation of the negative spring concept and its possible use in wave energy conversion! I would like to comment that just as important as shifting the natural frequency is the increase in relative bandwidth you get by lowering the total stiffness and/or mass. A device that oscillates with low stiffness and low mass (by design or by active control) will be able to show good performance in irregular waves.Anonymoushttps://www.blogger.com/profile/10093067486127298464noreply@blogger.com