Vibrations in ships are undesirable for several reasons. High vibration levels can impair crew performance and long-term exposure can have health consequences. Even moderate vibration levels can negatively affect the comfort levels of passengers and crew. Severe vibrations can lead to fatigue in structure and damage mechanical systems. Most vibration problems can be avoided by following good design practice. Correcting vibration problems once the vessel is in service is usually expensive, sometimes prohibitively so.
This webinar will briefly review the basic principles of structural vibrations and the methods used to predict vibration performance during the design stage. This includes prediction methods based on empirical expressions and also advanced numerical methods such as finite element analysis. Also discussed are various guidelines and standards that provide advice on good design practice and acceptance criteria related to vibration levels from the perspective of human comfort and also to limit structural damage. Vibration problems encountered in practice will be discussed through selected case studies. These will be used to illustrate a range of typical vibration problems and the measures taken to alleviate the problem in each case.
The authors are members of the HS7 Vibrations Panel and seek input from the audience and, ideally participation, in the HS7 panel.
Roger I. Basu, Roger Basu & Associates Inc. Toronto, Canada
Roger I. Basu is a structural engineer with over 45 years of experience working in the UK, Canada and the US mostly on ships and offshore installations. He has also worked in specialist areas including vibrations, fatigue & fracture and risk and reliability.
His recent experience includes two years teaching various subjects at Webb Institute which he joined in 2012 after retiring from a 15-year career with the American Bureau of Shipping (ABS), Houston, Texas. Prior to that he worked for 10 years at a naval architectural firm in Ottawa, Canada. At ABS Roger held a number of positions and retired as the Director of Shared Technology responsible for the development of technologies applicable to both marine and offshore sectors. In 2013 he started his own company, Roger Basu & Associates Inc., based in Toronto, Canada and works on various consulting and training assignments.
Roger holds a Ph.D. in structural engineering from the University of Western Ontario. He is a Professional Engineer registered in the Province of Ontario. He is a Fellow of SNAME and Chair of the T&R Hull Structure Committee.
Ali Motevaselani, Washington State Ferries, Seattle WA
Ali Motevaselani is a naval architect with over 23 years experience working in Iran and the US mostly on ships and offshore transportation. He has also worked in specialist areas including vibrations, fatigue, composite materials and seakeeping.
His latest position is as a naval architect with WA State Ferries which he joined in 2016 after returning from Singapore where he worked for an offshore installation company. He has also worked for Bechtel in Houston, Texas, and prior to that, he worked for CSC in Washington, DC and Austal in Mobil, AL as a naval architect on various US Navy military projects including the T-AO, LCS & JHSV programs.
Ali has undergone training by ANSYS and AutoDesk and applied his skills to a large range of challenging problems including ship-cargo interaction, ship structures, machinery vibration, etc. using linear, nonlinear, transient and random response analysis.
Ali holds an MSc in Ship Structural engineering and a BSc in Naval Architecture from Sharif University of Technology in Tehran. He is an EIT, a Member of SNAME and is Chair the HS7 Vibrations Panel.
RSVP only. No cost to attend