颗粒阻尼在浮筏隔振系统中的减振特性研究
Study on Vibration Reduction Characteristics of Particle Damping in Floating Raft Isolation Systems
孙晓红 1杨斌 1刘昌斌 1贾睿昊 2牛军川3
作者信息
- 1. 山东电力工程咨询院有限公司,济南 250013
- 2. 山东大学 机械工程学院,济南 250061;济南国科医工科技发展有限公司,济南 250101
- 3. 山东大学 机械工程学院,济南 250061
- 折叠
摘要
在船载和舰载机械设备的隔振工程实践中,浮筏系统作为一种高效被动振动控制措施得到广泛应用.为进一步提高浮筏隔振系统的减振效果,以一低内阻浮筏隔振系统为研究对象,采用子结构导纳法建立其动力学方程.设计由厚壁铝壳和不同粒径钢珠构成的颗粒阻尼器,将其安装于浮筏隔振系统的上平台或下平台.使用激振器对浮筏隔振系统进行扫频激励,通过对比安装有等质量的颗粒阻尼器和配重的隔振系统振级落差,定义颗粒阻尼器的替代损失和平均替代损失,通过该指标研究颗粒阻尼安装位置、粒径、填充率、表面粗糙度等对隔振性能的影响,并对颗粒阻尼器减振效果进行评估.研究表明,在浮筏隔振系统中颗粒阻尼器在较宽频段上都能起到良好减振效果,颗粒阻尼器平均替代损失大约能够达到4 dB.
Abstract
In the engineering practice of vibration isolation of machines and equipment installed on ships,the floating raft system has been widely used as an efficient passive vibration control method.In order to further improve the vibration reduction effect of the floating raft isolation system,a floating raft isolation system with low internal damping is studied.Its dynamic equation is established using the substructure mobility method.A particle damper consisting of thick-walled aluminum shell and steel balls with different diameters is designed,prepared and installed into the upper or the lower platform of the floating raft isolation system.A sweep excitation is exerted on the floating raft isolation system through a vibration exciter.By comparing the vibration level differences of the system installed with the same mass particle damper and the counterweight,the replacement loss and average replacement loss of the particle damper are defined.Through these indexes,the influences of the installation position,particle size,filling rate,surface roughness of the particle damper on the vibration isolation performance are studied,and the vibration reduction effect of the particle damper is evaluated.The research shows that the particle damper in the floating raft isolation system can play a good role in reducing vibration in a wide frequency band,and the average replacement loss of the particle damper can reach about 4 dB.
关键词
振动与波/颗粒阻尼/浮筏隔振系统/振级落差/替代损失Key words
vibration and wave/particle damping/floating raft isolation system/vibration level difference/replacement loss引用本文复制引用
基金项目
国家自然科学基金(52075294)
国家自然科学基金(51675306)
出版年
2024
国家科技期刊平台
NSTL
万方数据