冲击减振器等效刚度的一种新型设计方法
A New Design Method for Equivalent Stiffness of Vibro-impact Absorber
李文华 1张泽滨 1孙建国1
作者信息
- 1. 陕西航空电气有限责任公司,陕西 西安 710000
- 折叠
摘要
以某航空电源控制器机箱为研究对象,经分析由于加速度响应量值超过额定加速度限值导致器件出现故障.为了设计合适的减振器等效刚度,有效降低传递到该器件的冲击响应量值,提出一种新型的冲击减振器刚度设计方法.首先将安装减振器后的系统等效为单自由度的质量弹簧系统,计算冲击载荷下加速度响应的解析解,然后借助Matlab的Simulink平台进行联合仿真分析,绘制出冲击响应的传递率随频率比的变化曲线,根据该曲线确定出满足目标传递率的频率设计值;其次借助ANSYS的模态分析功能,研究减振器三向刚度耦合特性对主振动频率的影响,最后筛选出能兼顾目标传递率和系统稳定性的最优减振器刚度设计方案,显著提升了减振器刚度设计效率.获得的主要结论有:1)当目标传递率βmax设定为0.9时,根据βmax-R曲线确定主频率应设计在25.33 Hz或109.09 Hz;2)当减振器三向刚度设计为X=Z=50 N/mm,Y=663 N/mm时,系统能够满足目标传递率且整体刚性最优.
Abstract
This article investigates an aviation power control unit,focusing on analyzing its response to ac-celeration in three shock directions.The analysis demonstrates that the component's failure results from surpassing the acceleration limit.To mitigate the shock response effectively,a novel stiffness design meth-od is proposed for the vibro-impact absorber.Initially,a single degree of freedom mass-spring system is established based on the vibration isolation system to compute the theoretical solution of shock excitation.Employing Matlab and Simulink for co-simulation,a transmission rate curve of shock response is genera-ted with respect to the frequency ratio,facilitating the selection of frequencies that meet the desired trans-mission rate.Subsequently,the impact of three-dimensional stiffness coupling characteristics on the pri-mary vibration frequency is explored via finite element modal analysis.Finally,an optimal stiffness design scheme for the vibro-impact absorber is derived,which achieves a balance between the target transmis-sion rate and system stability.This method significantly enhances the efficiency of stiffness design for the vibro-impact absorber.1)For a target transmission rate βmaxof 0.9,the system's main frequency should be designed at either 25.33 Hz or 109.7 Hz,as indicated by the βmax-R curve;2)The system can meet the target transmission rate while optimizing integral rigidity when setting the three-dimensional stiffness val-ues of the vibro-impact absorber to X=Z=50 N/mm and Y=663 N/mm.
关键词
减振器/刚度设计/传递率/模态分析Key words
vibro-impact absorber/stiffness design/transmission rate/modal analysis引用本文复制引用
基金项目
工信部装函[2018]105号项目资助()
出版年
2024
NETL
NSTL
万方数据