船舶力学
船舶力學
선박역학
Journal of Ship Mechanics
2015年
9期
1139-1148
,共10页
轴系%扭转振动%波分析%油膜刚度
軸繫%扭轉振動%波分析%油膜剛度
축계%뉴전진동%파분석%유막강도
shafting%torsional vibration%wave approach%oil film stiffness
为确保带减速齿轮箱主推进系统的可靠性,文章对船舶轴系的扭转振动进行了研究。首先根据各组成部件的特点将轴系分解为连续和离散的两个子系统,分别利用波分析法和多自由度系统分析法列出连续子系统的波动形式及离散子系统的振动微分方程,同时考虑了减速齿轮箱油膜刚度的影响。然后根据两子系统连接处的动态平衡和连续条件,建立整个轴系在扭转振动模式下总运动方程,通过求解总方程得到系统的位移响应。该扭转振动分析被应用到某LNG船带减速齿轮箱的轴系振动计算中,通过考虑轴系减速齿轮箱啮合齿面间油膜刚度使轴系扭转振动模型更接近轴系实际运转工况。计算结果显示:随着减速齿轮箱啮合齿面间油膜刚度的增加,最大轴系扭转应力向低转速区域偏移。这对船舶轴系转速禁区的划分产生极大的影响。有助于防止因不良轴系振动计算引起轴系事故的发生。
為確保帶減速齒輪箱主推進繫統的可靠性,文章對船舶軸繫的扭轉振動進行瞭研究。首先根據各組成部件的特點將軸繫分解為連續和離散的兩箇子繫統,分彆利用波分析法和多自由度繫統分析法列齣連續子繫統的波動形式及離散子繫統的振動微分方程,同時攷慮瞭減速齒輪箱油膜剛度的影響。然後根據兩子繫統連接處的動態平衡和連續條件,建立整箇軸繫在扭轉振動模式下總運動方程,通過求解總方程得到繫統的位移響應。該扭轉振動分析被應用到某LNG船帶減速齒輪箱的軸繫振動計算中,通過攷慮軸繫減速齒輪箱齧閤齒麵間油膜剛度使軸繫扭轉振動模型更接近軸繫實際運轉工況。計算結果顯示:隨著減速齒輪箱齧閤齒麵間油膜剛度的增加,最大軸繫扭轉應力嚮低轉速區域偏移。這對船舶軸繫轉速禁區的劃分產生極大的影響。有助于防止因不良軸繫振動計算引起軸繫事故的髮生。
위학보대감속치륜상주추진계통적가고성,문장대선박축계적뉴전진동진행료연구。수선근거각조성부건적특점장축계분해위련속화리산적량개자계통,분별이용파분석법화다자유도계통분석법렬출련속자계통적파동형식급리산자계통적진동미분방정,동시고필료감속치륜상유막강도적영향。연후근거량자계통련접처적동태평형화련속조건,건립정개축계재뉴전진동모식하총운동방정,통과구해총방정득도계통적위이향응。해뉴전진동분석피응용도모LNG선대감속치륜상적축계진동계산중,통과고필축계감속치륜상교합치면간유막강도사축계뉴전진동모형경접근축계실제운전공황。계산결과현시:수착감속치륜상교합치면간유막강도적증가,최대축계뉴전응력향저전속구역편이。저대선박축계전속금구적화분산생겁대적영향。유조우방지인불량축계진동계산인기축계사고적발생。
Shafting vibration calculation is put out to ensure better reliability of main propulsion sys-tem with gearbox. The shafting system is modeled into continuous and discrete sub-systems, taking oil film stiffness of gearbox into consideration simultaneously. Wave approach and transit matrix method are used to investigate the displacement and stress fields in continuous and discrete sub-system re-spectively. And vibrations in different modes in both sub-systems are coupled by using dynamic e-quilibrium and continuity condition to deduce the global equations governing the motion of shafting. The torsional vibration calculation is then applied to research a certain LNG vessel with gearbox. It is shown that the vibration model with considered oil film stiffness is more reliable for the shaft-ing system with gearbox. The calculated results show that the max torsional stress appears in lower speed with oil film stiffness of gearbox ascending, and the barred-speed range is influenced greatly. This is helpful to prevent ship shafting accidents due to some poor shafting vibration calculation.