摘要船舶振动会对船舶造成极大地危害，所以说采取合适的减振措施是非常必要 的。其中动力吸振器是常用的的减振方法之一，被普遍应用于船舶辅机减振中。

本文针对船舶辅机吸振系统，运用 MATLAB 中 Simulink 模块对安装动力吸 振器前后的辅机系统进行建模。重点研究动力吸振器中的质量、刚度和阻尼等三 种参数对动力吸振系统的影响规律，并对辅机系统吸振前后的振动量进行了对比。本文研究的空气压缩机系统的质量为 26 kg ，仿真研究了吸振器质量分别为1。5 kg 、2 kg 和 2。5 kg 时的吸振效果。通过比较三种不同质量的动力吸振器减振 的效果，得到如下结论（1）三种不同质量的动力吸振器都可以不同程度的减小 系统的振动，其中 2。5 kg 的吸振器减振效果最好。吸振效率随质量的增大而增大。

（2）动力吸振器吸振效率随阻尼增大而减小，其阻尼和吸振效率基本呈线性关 系。（3）总存在一个刚度使主系统振幅最小，此刚度对用的吸振器固有频率等 于激振力频率，当吸振器固有频率和主系统激振频率偏差较大时，动力吸振器的 吸振效率急剧下降，甚至可能加大主系统的振幅。综合上述分析，本文最后采用的动力吸振器主要参数为：吸振器质量为 2。5 kg ，刚度为 222682。95 N / m ，阻尼6。5 N s / m 。在上述参数下得到的吸振效率为 91。9%，所以采用合适的动力吸振 器能够很好地减弱辅机的振动。83382

毕业论文关键词：振动；动力吸振器；辅机；MATLAB；仿真

Abstract Vibration is greatly harmful to ship, so it is very necessary to take appropriate measures to decrease vibration。 The vibration absorber damping is one of commonly used methods, which is widely used in auxiliary damping of ship 。

In this paper,we use Simulink blocks which is in MATLAB to bulid the model of auxiliary vibration absorbing systems before and after the setup of vibration absorber。 For the system of marine auxiliary vibration absorbing,I focuse on the vibration absorber in three parameters, mass, stiffness and damping on the dynamic influence of vibration absorption system。 Besides, I also compared auxiliary systems and the amount of vibration absorbing vibration before and after。 In this paper, the quality of

the  air  compressor  system  is  26 kg  and  the  simulation  of  the  vibration  mass arevibration absorbing effect 1。5 kg , 2 kg and 2。5 kg 。 By comparison of three    differentquality of vibration absorber, three conclusions are as follows: (1) three different quality of vibration absorber can be varying degrees of vibration reduction system   tosome  degree,  and  the  effect  of  2。5 kg  of  vibration  damping  is  the best。Vibration

absorption efficiency increases with the quality。 (2) damping vibration absorbing  is the smaller the better。That is to say vibration absorber vibration absorbing efficiency decreases with increased damping, and damping and vibration absorption efficiency is substantially linear。 (3) there is always a stiffness of the main system minimum amplitude, this stiffness on vibration natural frequency equal to the excitation force frequency when vibration natural frequencies and the main  system vibration frequency deviation is large, the vibration absorber vibration absorption efficiency a sharp decline, and may even increase the amplitude of the primary system。 The main parameters of  power  above  analysis,  this  paper  finally  uses  vibration as: vibrationquality  of  2。5  kg  ,   222,682。95stiffness,  damping  6。5absorbing efficiency at the above parameters obtained is 91。9%, so the use of appropriate vibration absorber can reduce vibration auxiliaries effectively。