磁流变脂离心沉降对曲轴磁流变扭振减振器减振性能的影响
Effect of centrifugal sedimentation of magnetorheological grease on damping performance of crankshaft magnetorheological torsional vibration dampers
宋寅涛 1欧阳青 2胡红生 3杨嘉斌 3沈宇4
作者信息
- 1. 浙江理工大学机械工程学院,杭州 310018;嘉兴大学信息科学与工程学院,浙江嘉兴 314001
- 2. 嘉兴大学信息科学与工程学院,浙江嘉兴 314001;南京理工大学机械工程学院,南京 210044;台州九桔科技股份有限公司,浙江台州 318000
- 3. 嘉兴大学信息科学与工程学院,浙江嘉兴 314001
- 4. 嘉兴经济技术开发区投资发展集团有限公司,浙江嘉兴 314000
- 折叠
摘要
为了探究磁流变脂离心沉降导致的磁流变扭振减振器减振性能变化问题,通过理论分析、离心实验与振动仿真,研究离心沉降影响下曲轴系统经减振器减振后的振幅变化.首先,在旋转工况下对磁流变脂铁磁颗粒进行受力分析,计算铁磁颗粒离心沉降的临界转速;其次,依据临界转速设计磁流变脂离心实验方案,并进行磁流变脂离心实验,对沉降后磁流变脂的特性变化进行分析和多项式拟合;再次,建立曲轴系统动力学模型,将拟合多项式代入动力学模型,计算不同转速下的阻尼系数;最后,运用AMESim建立曲轴系统振动仿真模型,验证磁流变扭振减振器的减振效果,并探讨离心沉降影响下磁流变扭振减振器减振性能的变化.结果表明:外加磁场可以提高磁流变脂离心沉降的临界转速,保证了磁流变脂在低转速下的稳定性;随着转速的升高,磁流变脂离心沉降逐渐加剧,磁流变脂的黏度、剪切屈服应力和相对磁导率均呈下降趋势,但外加磁场可以有效抑制磁流变脂的离心沉降;考虑离心沉降因素下,随着转速的升高,减振器的阻尼系数逐渐降低;通过振动仿真分析可知,在离心沉降的影响下,磁流变扭振减振器的减振性能明显降低,减振后曲轴一阶固有频率10谐次振幅上升了 9％,8谐次振幅上升了 16％,6谐次振幅上升了 40％.该研究为磁流变扭振减振器结构优化与减振性能补偿提供理论参考,有助于提高磁流变扭振减振器性能研究的精确性.
Abstract
To investigate the change of damping performance of magnetorheological torsional vibration dampers due to centrifugal sedimentation of magnetorheological grease,the amplitude change of the crankshaft system under the influence of centrifugal sedimentation after damping by the damper was investigated through theoretical analysis,centrifugal experiment and vibration simulation.Firstly,the force analysis of magnetorheological grease ferromagnetic particles was carried out under rotating conditions to calculate the critical rotational speed for centrifugal sedimentation of ferromagnetic particles.Second,the magnetorheological grease centrifugation experimental program was designed based on the critical rotational speed,and the magnetorheological grease centrifugation experiments were conducted to analyze the changes in the properties of the magnetorheological grease after sedimentation and to fit the equations.After that,a dynamic model of the crankshaft system was established,and the fitted equations were substituted into the dynamic model to calculate the damping coefficients at different rotational speeds.Finally,AMESim was used to establish a vibration simulation model of the crankshaft system to verify the damping effect of the magnetorheological torsional vibration damper and to explore the changes in the damping performance of the magnetorheological torsional vibration damper under the influence of centrifugal sedimentation.The results show that the applied magnetic field can increase the critical rotational speed for centrifugal sedimentation of magnetorheological grease and ensure the stability of magnetorheological grease at low rotational speeds;with the increase of the rotation speed,the centrifugal sedimentation of magnetorheological grease gradually intensifies,and the viscosity,shear yield stress and relative permeability of magnetorheological grease all show a decreasing trend,but the applied magnetic field can effectively inhibit centrifugal sedimentation of magnetorheological grease;considering the centrifugal sedimentation factor,the damping coefficient of the damper decreases as the rotational speed increases;the vibration simulation analysis shows that under the influence of centrifugal sedimentation,the damping performance of the magnetorheological torsional vibration damper is significantly reduced,and the first-order intrinsic frequency of the crankshaft after damping increases by 9％at the 10th harmonic amplitude,16％at the 8th harmonic amplitude and 40％at the 6th harmonic amplitude.This study provides theoretical reference for structure optimization and vibration damping performance compensation of magnetorheological torsional vibration dampers,and helps to improve the accuracy of magnetorheological torsional vibration dampers'performance research.
关键词
磁流变脂/磁流变扭振减振器/离心沉降/曲轴系统/减振性能Key words
magnetorheological grease/magnetorheological torsional vibration damper/centrifugal sedimentation/crankshaft system/damping performance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据