摘要
伴随动力机械轻量化的发展,运动部件与机体的质量比增大,将引发明显的机体振动。为研究轻量化条件下的动力机械机体固有频率与内部质量比的关系,设计了模拟动力机械不同质量比的试验台架,在其静态和动态工况下进行振动测试,发现两者固有频率存在差异;建立起内力联接的动力隔振内力拓扑模型,解释固有频率差异的原因;推导关于质量比、频率比的二元动力传递函数并从侧视和俯视两个角度对三维曲面进行分析。结果表明,在轻量化背景下,动力机械机体固有频率存在随着质量比增加而向大值漂移的现象,研究中的二元动力传递函数能够表达内力模型下动力机械固有频率的分布特性,可以为动力机械系统参数辨识及隔振器设计提供理论基础。
With the constant development of lightweight power machinery,the mass ratio of the moving parts to the body increases,and consequently induces more obvious body vibration.In order to study the relationship between the natural frequency of the power machinery body and the internal mass ratio in the lightweight design,an experimental bench for simulating different mass ratios of power machinery was designed.Vibration tests were carried out under static and dynamic conditions,proving the existence of differences in the natural frequencies.The moving parts and the body were connected by the internal force,and the internal force topology model for the dynamic vibration isolation effect was established to interpret the difference in the natural frequency.The two-parameter dynamic transfer function relating to the mass and frequency ratios was derived,and the three-dimensional surface of the dynamic transfer function was analyzed from two angles of side view and top view.The results show that under the background of lightweight design,the natural frequency of the power machinery body drifts to the maximum value by the increase of mass ratio.The binary dynamic transfer function established can express the distribution characteristics of the natural frequency of the power machinery by virtue of the internal force model.It has better applicability,and provides a theoretical basis for the parameter identification and vibration isolators design of power mechanical systems.
作者
郝慧荣
赵文超
杨子明
王佳苇
任江鹏
刘占峰
HAO Huirong;ZHAO Wenchao;YANG Ziming;WANG Jiawei;REN Jiangpeng;LIU Zhanfeng(College of Energy and Power Engineering,Inner Mongolia University of Technology,Hohhot 010051,China)
出处
《振动与冲击》
北大核心
2025年第2期73-83,119,共12页
Journal of Vibration and Shock
基金
国家自然科学基金(12262028)
内蒙古自治区科技计划项目(2021GG0437)
内蒙古自治区高校“青年科技英才支持计划”(NJYT22085)。
关键词
内力拓扑模型
动力传递函数
固有频率
峰值曲线拟合
internal force topology model
dynamic transfer function
natural frequency
peak curve fitting
作者简介
第一作者:郝慧荣,男,博士,副教授,1981年生,E-mail:tchhrzhj@163.com。
