基于广义积分变换法海洋温差能大口径冷水管强迫振动分析.pdfVIP

基于广义积分变换法海洋温差能大口径冷水管强迫振动分析

摘要：复杂多变的海洋工况将诱发大口径冷水管强迫振动，为探明均布载荷、线性变化的静水压力、集中载荷和

周期载荷作用下冷水管振动响应机制。基于Euler-Bernoulli梁理论，建立了管道动力学控制方程,采用广义积分变换法，

求解了系统强迫振动的解析解，并与同伦摄动法相对比，验证了该方法的高精度和有效性，分析了内流、黏弹性耗散系数、

阻尼比和质量比对管道振动特性的影响。结果表明：当内流流速对应的振动频率与固有频率接近时，管道将出现动态失

稳。增大黏弹性耗散系数、阻尼比和质量比对横向位移的抑制效果呈现依次递减的规律，改变激振位置和激振频率可显

著改变管道横向位移。该研究成果可对冷水管的初期设计提供一定的指导作用。

关键词：海洋温差能；大口径冷水管；广义积分变换法（GITT）；强迫振动；参数分析；振动特性

Abstract:Complexandever-changingoceanconditionscaninduceforcedvibrationoflarge-diametercoldwater

pipe.Here,toexplorevibrationresponsemechanismofcoldwaterpipeunderuniformlydistributedload,linearlyvarying

hydrostaticpressure,concentratedloadandperiodicload,basedonEuler-Bernoullibeamtheory,thepipingdynamic

governingequationwasestablished.Thegeneralizedintegraltransformationtechniquewasusedtoobtaintheanalytical

solutiontothesystemforcedvibration.Comparedwiththehomotopyperturbationmethod,thehighaccuracyand

effectivenessofthismethodwereverified.Effectsofinternalflow,viscoelasticdissipationcoefficient,dampingratioand

massratioonpipingvibrationcharacteristicswereanalyzed.Theresultsshowedthatwhenthevibrationfrequency

corespondingtointernalflowvelocityisclosetothepipingsystemnaturalfrequencies,itcanhavedynamicinstability;

suppressingeffectsofincreasingviscoelasticdissipationcoefficient,dampingratioandmassratioonlateraldisplacements

presentdecreasingtrendsinsequence;changingexcitationpositionandfrequencycansignificantlychangelateral

displacementsofthepipingsystem;thestudyresultscanprovideacertainguidanceforinitialdesignofcoldwaterpipe.

Keywords:oceantemperaturedifferenceenergy;large-diametercoldwaterpipe;generalizedintegraltransformation

technique(GITT);forcedvibration;parametricanalysis;vibrationcharacteristics

海洋温差能是海洋能中储量最大、最稳定的清洁可再生能