ABS’ Leontopoulos delivers prestigious lecture at NTUA
ABS Greece was invited by Professors Lampros Kaiktsis and Christos Papadopoulos, of the National Technical University of Athens (NTUA), to deliver a lecture on ship vibration, entitled “Ship Vibration: What Went Wrong?”.
The 2-hour seminar took place on the 10th of December, 2020 to a group of graduate and post graduate students in the school of Naval Architecture and Marine Engineering, while special external guests/specialists were also invited.
Dr. Chris Leontopoulos, ABS director of the Global Ship Systems Center, gave an overview of the principles of vibration and then went on to present 5 special case studies, where ABS was involved in the pertinent technical investigations relating to propeller cavitation induced vibrations, frequency beating, spade rudder vibrations, etc.. During the presentation, the correlation between measurements and simulation calculations was emphasized.
“Typically, the designer is aware of the vessel’s structures’ natural frequencies and typical forcing functions and would take all the necessary measures to ensure de-tuning to avoid resonances during operation. However, there are still situations where resonances can go undetected during the design stage. Such cases could be the results of unaccounted power requirements, optimization of efficiency, etc. Design Modifications may not always “tap” on the experience base of the designer and can introduce “unknown” factors”, said Dr Leontopoulos.
“It is of utmost importance to note the application of theory into practice and hence appreciate the business risks and the consequences onto the marine operations”, said Professor Papadopoulos of NTUA. After the presentation, there was a lively discussion with questions and answers. ABS and NTUA are cooperating on EU funded R&D projects as well as joint development projects in pertinent areas.