船舶“设备-基座”变参数系统复杂振动机理研究

项目名称： 船舶“设备-基座”变参数系统复杂振动机理研究

项目编号： No.51209052

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 水利科学与海洋工程学科

项目作者： 庞福振

作者单位： 哈尔滨工程大学

项目金额： 25万元

中文摘要： 船舶设备多通过螺栓或隔振器、刚性或弹性与船体基座相连，设备微幅振动时，"设备-基座"系统可视为线性系统；设备振动较大时，设备将周期性拉伸螺栓、压缩基座，或周期性拉压隔振器，由于螺栓及基座刚度存在差异，隔振器拉压刚度也不相同，"设备-基座"系统连接界面刚度将发生改变，并构成分段线性或慢变参数系统，使设备振动线谱增加。该动力学现象与螺栓预紧力、螺栓及基座刚度、隔振器参数、设备激扰力与激扰力矩等密切相关。本研究拟针对设备不平衡激扰力与激扰力矩联合作用情况，从"设备-基座"系统微分运动方程入手，基于非线性振动理论，结合数值计算及物理试验验证，揭示船舶"设备-基座"系统复杂动力学机理，为船舶减振降噪及相关研究提供依据。主要研究包括: 1)船舶"设备-基座"变参数系统复杂振动模型研究；2)系统参数对船舶"设备-基座"变参数系统复杂振动的影响研究；3）船舶"设备-基座"变参数系统非线性振动产生条件。

中文关键词： 船舶；“基座-设备”变参数系统；非线性振动；稳定性；减振降噪

英文摘要： Ship equipments commonly connect with ship hull basements through bolts or vibration isolators when rigidly or elastically fixed. If the vibration amplitude of the equipment is insignificant, the ship "equipment-base" system is regarded as a linear system. However, if the vibration of the equipment is great, bolts and the base will be pulled and compressed within periodical cycle when the equipment is rigidly fixed, or isolators will be periodically pulled and compressed within periodical cycle by the equipment if the equipment is elastically fixed. As the stiffness of bolts and the base is quite different, the extensive and compressive stiffness of vibration isolators are also varient, the stiffness of connection interface of the ship "equipment- base" system will change, and the "equipment- base" system will thus constitute a piecewise linear or a parameter variant system, which will cause the vibration spectrum of the equipment increased. The structural dynamic phenomena is highly related to the pre-tension of bolts、stiffness of bolts and the base, structural dynamics parameters of isolators, unbalanced force and momentum of the equipment. This research focuses on the study of the complex vibration situated that the unbalanced force and momentum of the equipment act on the base together. Starting from the mot

英文关键词： ship；“equipment-base” system with variant parameters；nonlinear vibration；stability；vibration controlling and noise reduction