100m新型极地探险邮轮振动特性研究

建立了新型极地探险邮轮的有限元模型,利用虚质量法计算了整船湿模态,并与激励力主频对比,初步验证整船结构振动特性设计的合理性。通过频响分析方法计算了振动速度-激励力的导纳矩阵,测试了航行时船尾底板和主机机脚处的振动速度,利用测试振动速度和导纳矩阵反推出螺旋桨和主机激励力。将得到的螺旋桨和主机激励力加载至有限元模型中,计算各个舱室的振动速度,并与舱室振动速度测试值对比,误差在工程允许范围内,验证了激励力的准确性。在有限元模型上单独加载螺旋桨和主机激励力,计算各个舱室的振动速度,分析两种激励源对各个舱室振动速度的贡献率,为新型极地探险邮轮的前期振动评估和后期振动控制提供针对性参考。

Vibration characteristics of a 100 m new type of polar exploration cruise

The finite element model of a new type of polar exploration cruise was established,the global wet modal was analyzed based on the virtual mass theory,and the modal frequency calculated was compared with the main frequency of the exciting force to verify the stagger between them.The vibration velocity exciting force admittance matrix was calculated by the frequency response analysis and the vibration velocity on the stern plate and main engine foundations was tested during the trial trip.Then,the exciting forces of propeller and main engine were derived by using the vibration velocity and admittance matrix.Loading the exciting forces on the finite element model,the cabin vibration velocity was caculated by carrying out the frequency response analysis,and the result was compared with the tested value,showing the tolerence is within the allowable scope in engeering.Loading the main enging and propeller exciting forces on the finite model respectively,the contribution ratio of the two exciting forces to the cabin vibration velocity was analyzed respectively.The results provide a reference for the vibration assessment in early stage and control in late stage.