基于有限元法的大型汽车滚装船振动预报

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中图分类号：U661.44 文献标志码：A

Vibration Prediction forLarge Pure Carand Truck Carriers BasedonFiniteElementMethod

SHI Guangwei'，HUANG Dezhuang²， YAN Weixiang'，HUA Kangl（1.SanghaiSigdeachiutegna;ldigusty，d，a）

Abstract： The complex structure of large Pure Car/Truck Carriers （PCTCs）imposes high computational demands for ful-ship finite element vibration analysis.This paper examines the numerical principles offinite element vibration prediction，summarizing the fundamentals of modal calculation and frequency response analysis based on the modal superposition method and direct method.Taking a large PCTCas an example，it compares the impact of computerconfigurations on computational efciencyand analyzes the vessel's natural frequencies and vibration responses.The results of the frequency response analysis indicate low velocity responses in living quarters across superstructure decks， while relatively higher responses occur in the aft regions of each deck.Structural stifess in these aft deck areas warrants appropriate attention.

Key words： finite element vibration calculation; modal superposition method; pure car and truck carrier （PCTC）； frequency response analysis

1 引言

目前，大型运输船舶的总振动预报通常基于全船有限元模型进行，全船有限元振动计算将全船结构通过有限元模拟，对一些设备、敷料等重量可通过非结构重量或集中质量点模拟，全船有限元振动预报能准确模拟全船的重量和刚度分布，对全船模态和频率响应计算而言具有足够的精度。（剩余5015字）