【摘要】 针对20 000t近海散货船的有害振动问题,通过实船振动测试、自航与拖模试验、尾部伴流场评估和三维有限元计算,找到主要振源是螺旋桨.振动问题的根源是尾部线型不合理,导致伴流严重不均匀和不定常,引起的螺旋桨叶频和倍叶频激励过大.提出更换螺旋桨、采用阻尼减振等一揽子综合减振措施.更换螺旋桨后,船舶的剧烈振动得到明显改善,满足ISO—6954振动衡准要求.同时在营运船舶有害振动诊断与治理方面取得了宝贵经验,并对船舶设计阶段的防振提出建议.更多还原

【Abstract】 A case study on the diagnosis and treatment aiming at harmful vibration of 20 000 ton offshore bulk carrier are presented.It is found that vibration source is the propeller by vibration test,self-propulsion test and towing test,evaluation of wake fields behind stern and numerical calculation and analysis with 3-D FEM.The root of the problem is that the stern forms are unreasonable,which cause wake fields serious non-uniform and unsteady,leading to excessive blade frequency and twice blade frequency propeller-excited force.A set of comprehensive treatment is proposed,such as redesigning propeller,adopting vibration damping.Ship vibration are great improved by changing the propeller,which meets vibration criterion ISO—6954.Also it gains beneficial experiences for ship vibration diagnosis and treatment and some suggestions for anti-vibration are proposed at the design stage.更多还原