Experimental Investigation and Numerical Simulation of Ship Stern Structural Vibration Model
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Experimental Investigation and Numerical Simulation of Ship Stern Structural Vibration Model YE Xinghong (),
XIA Lijuan ∗ ()
(State Key Laboratory of Ocean Engineering; Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration; School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)
© Shanghai Jiao Tong University and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: Vibration at the stern area is generally the most severe of the entire ship hull, which has always attracted special attention by ship designers and researchers. With reference to a real ship structural layout, a scaled stern model of steel structure was innovatively designed to carry out the mode and response tests. Corresponding finite element (FE) model representing the tested structure was established for verification of commonly-used calculation methods of modal parameters and response. Good agreement between experimental and numerical results demonstrates the credibility of FE method, and some key points of modeling and calculating are discussed. In addition, with the combination of the experiment and calculation, some vibration characteristics of ship stern structure are summarized for future ship design guideline. Key words: stern vibration, model test, virtual mass method, modal superposition method, vibration characteristics, finite element (FE) model CLC number: U 661.44 Document code: A
0 Introduction Ship vibration, especially for the stern structure, is a major hazard that deteriorates safety of ship structure, service life of equipment, and living amenity of sailors and passengers[1]. When sailing at sea, ships are inevitably influenced by various sources of excitation, e.g., the main engine, the propeller, the air conditioning system, and the slamming of waves[2]. With the development of construction technology, modern ships have larger size and higher speed, which brings about more serious vibration problems. Lots of previous studies analyzed ship vibration with numerical calculation and experimental measurement. To calculate wet modes of a ship, Lewis[3] first applied conformal mapping to derive added mass coefficient which was later improved by Landweber[4] and Todd[5] . In recent years, finite element (FE) analysis was employed most frequently to forecast ship vibration characteristics in the design phase[6-8] . The commonly-used virtual mass method and modal superposition method give a fast solution of wet modes and response. However, the FE model is an idealization of real ship structure[6] . Some hypotheses are made in virtual mass method[9] , and only low-order modes are Received: 2020-06-08 Accepted: 2020-09-10 ∗E-mail: [email protected]
extracted in modal superposition method for simplified calculation[10] . These factors may bring about numerical error, and experiment is still an effective measure to investigate ship vibration characteristics. To verify the accuracy of virtual mass method, and meanwhile examine the appropriate truncat
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