柴油机周期双层隔振系统振动特性

Vibration Characteristics of Double-layer Vibration Isolation System with Periodic Intermediate Structure

为提高船舶动力设备双层隔振系统的隔振效果,基于柴油机双层隔振系统,利用周期结构对弹性波的带隙特性,将双层隔振系统的筏体设计成周期结构。在ANSYS软件中对双层隔振系统进行谐响应计算,并对传统筏体双层隔振系统、直方柱周期筏体双层隔振系统和斜方柱周期筏体双层隔振系统的隔振效果进行对比分析。结果表明,斜方柱周期筏体双层隔振系统在200 Hz^1 000 Hz内具有更好的隔振效果,在410.5 Hz和807 Hz处出现带宽分别为15.0 Hz和29.5 Hz的带隙。此外,采用缩减周期数的斜方柱周期筏体建立双层隔振试验系统,验证斜方柱周期结构的带隙特性。

In order to raise the vibration isolation performance of the double-layer vibration isolation system of the ship power equipment, based on the double-layer vibration isolation system, the periodic structure is used to design the band structure of the elastic wave, and the intermediate structure of the double-layer vibration isolation system is designed into a periodic structure. In the ANSYS, the harmonic response of the double-layer vibration isolation system is calculated. Through comparative analysis of the effect of the traditional, histogram column and skew square column double-layer vibration isolation, the periodic middle structure of skew square column has better vibration isolation effect in 200 Hz^1 000 Hz. The bandwidths of 15.0 Hz and 29.5 Hz appear at 410.5 Hz and 807 Hz respectively. A double-layer vibration isolation experiment system is built by using the periodical structure with a reduced number of cycles, and the band-gap characteristics of the periodic structure of the skew square column are verified.