ISFD阻尼液黏度影响齿轮轴系减振特性的实验研究

鉴于二甲基硅油较高的黏度及良好的热稳定性,考虑将其作为整体式挤压油膜阻尼器(Integral squeeze film damper,ISFD)的阻尼液,研究ISFD阻尼液黏度对齿轮轴系减振特性的影响规律。建立了ISFD弹性阻尼支承系统力学模型和齿轮传动有阻尼单自由度振动模型,证明了ISFD用于齿轮轴系减振的有效性。搭建一级直齿轮传动轴系实验台,对比了齿轮轴系分别安装刚性支承和不同阻尼液黏度ISFD弹性阻尼支承的振动。研究发现,以二甲基硅油作阻尼液的ISFD可以有效抑制齿轮轴系振动,且减振效果良好,降幅可达50%以上;在一定黏度范围内,随着ISFD阻尼液黏度的增加,齿轮轴系的振动降幅增大;以二甲基硅油作阻尼液的ISFD具有优良的阻尼减振性能,可以有效抑制大部分频率成分的振动,保证齿轮系统平稳工作。

Experimental Study on the Influence of the Viscosity of ISFD Damping Fluid on Vibration Reduction Characteristic of Gear Shafts

Because of the higher viscosity and good thermal stability,the dimethyl silicone oil is considered as a damping fluid for integral squeeze film damper(ISFD).The influence of damping fluid’s viscosity of ISFD on the vibration reduction characteristics of gear shafts is studied.The mechanical model of ISFD elastic damping bearing system and the damping single-degree-of-freedom vibration system of the gear system are established,which shows the effectiveness of ISFD in vibration reduction of gear shafts.A first-grade spur gear bench is built to compare the vibration of the gear system with rigid support and ISFD elastic damping support with different viscosity damping fluids.Experimental results show that ISFD with a damping fluid of dimethyl silicone oil can effectively inhibit the vibration of gear shafts,and the decline of vibration amplitude is more than 50%.With the increase of viscosity of ISFD damping fluid,the decline amplitude of gear shafts vibration increases.The ISFD with a damping fluid of dimethyl silicone oil has excellent damping vibration attenuation characteristics,which can effectively reduce the vibration of various frequency components and guarantee the smooth operation of the gear transmission.