The Development And Validation Of The Ship Shafting Torsional Vibration Analysis Software

Diesel engine is very important to the ship’s security, just likes the "heart" of the ship. So the torsional vibration of the shafting system is an important factor for the safe navigation of the ship. With the rapid development of the modern shipbuilding industry, different types of the power plant emerge constantly, and they are more complex than ever. The torsional vibration may cause major accidents in severe cases, affect the ship operation and the safety of the staff. More concern is needed to this issue. The design calculation sheet and measurement results of the shafting torsional vibration for the main engine150HP higher are mandated to submit by many ship classification societies. Furthermore, due to China legal rules, such as’The construction rules for inland steel ships’and’The construction rules for marine ships’, the analysis report of the shafting torsional vibration must be provided, too. Therefore, it is very important to develop software for the analysis and test of the ship shafting torsional vibration, with great generality, high integration, friendly interface and reliable precision.In this paper, the methods to test and analyze ship torsional vibration have been researched based on the theory of ship shafting torsional vibration. On the Windows platform and MATLAB environment, the software for the analysis and test of ship shafting torsional vibration has been developed and verified by measurement results. The main work includes:(1) On the demand of user and the developing rules of software engineering, the main software model are classified and schematized;(2) Compare the characteristic feature of the contact and non-contact measurement method, select the non-contact measurement method for the shafting torsional vibration test;(3) Select Holzer method and coefficient amplification method for the free vibration and forced vibration calculation;(4) Using MATLAB as the design tool to develop the ship shafting torsional vibration analysis software, and verify the calculation results by comparing with the onboard torsional vibration test results.