基于磁流变弹性体的船舶轴系纵振动力吸振器的实验研究

磁流变弹性体是一种新型的智能材料,由微米级的羰基铁粉和聚合物合成.由于它具有弹性模量可调、无需封装、稳定性好、响应快等优点,已被广泛应用于机械振动控制等领域.文中针对船舶推进轴系纵振动力学特性,提出一种固有频率可调的磁流变弹性体动力吸振器用于轴系纵振控制.首先理论分析了安装动力吸振器的推进轴系的动力学模型,其次对动力吸振器进行了移频特性试验,并在1:4的船舶轴系缩比模型上进行了变转速工况下吸振效果试验.实验结果表明,该吸振器具有12.3 Hz的移频范围,并且在不同轴系工作转速下相比于被动式吸振器均有更好的吸振效果.

Experiment Research of Axial Dynamic Vibration Absorbers Based on Magneto-Rheological Elastomers Using for Ship Shafting

Magneto-Rheological Elastomers (MREs) are a new kind of Magneto-Rheological materials mainly composed of polymer rubber and micro-sized magnetizable iron particles. Dynamic vibration absorbers (DVAs) based on MREs are widely used in vibration systems with small amplitude since they have the advantages of no sealing equipments, good stability, and rapid response. This paper aims to research on the application of MREs in SDVAs for reducing axial vibration of ship shafting by experimental methods. The dynamic design principle of an axial SDVA attached to ship shafting, which is modeled as a continuous beam system, is studied. A DVA with adjustable stiffness based on MREs is proposed and its natural frequency-shift performance is tested. And, an experimental re-search on a model ship with scaled ratio 1:4 is carried out to verify the vibration attenuation capaci-ty of SDVAs while propulsion shaft working on different rotation speeds. The results show that the MRE-based DVA has frequency-shift of 12.3 Hz and performs better than classic passive DVA on all rotation speeds.