摘要
针对现有用于金属表面纳米化的机械研磨装置存在效率较低、发热量大、振动频率固定等问题,提出了一种利用液压动态冲击与波动能实现金属材料表面纳米化的新型机械研磨试验机,试验过程中所需的液压动态冲击与波动能,由变频电机驱动一种三位四通转阀获得。介绍了该试验台的工作原理、结构组成,建立了试验机液压系统的数学模型,采用四阶龙格-库塔算法对该数学模型进行了求解,并进行了振动特性实验。对比分析表明:理论计算与实验结果基本吻合,误差较小,从而证明了理论模型的正确性;该试验机可以在0~94.2 Hz的振动频率内工作,随着振动频率的增加,振动位移幅值变小,而速度及加速度的峰值变大。所提出的新型振动策略、数学模型和研究结果,为后续进一步优化和促进该机械研磨试验机工程化提供了基础。
Current mechanical grinding devices used for metal surface nano-crystallization have the problems of low efficiency,heating and narrow band of excitation frequencies.To overcome the above shortcomings,this paper proposed a new test machine employing the hydraulic impact and fluctuation energy as the excitation source,the hydraulic impact and fluctuation energy is obtained by driving a novel three-position four-way rotary valve using a variable frequency motor.The mechanism and configuration of the new machine was introduced,mathematical modeling and numerical solution using the fourth-order Runge-kutta algorithm of the hydraulic system was performed,and practical vibration experiments were carried out.Comparison of the theory research results with the experimental results,it is shown that the theory results are very close to the experimental results with allowable errors,thus,the mathematical model is validated;the new testing machine can work in a wide excitation frequency range of 0~94.2 Hz,In addition,with the increasing of excitation frequency,the vibration amplitude decreases,and velocity and acceleration amplitudes increase.The proposed new excitation approach,the mathematical model and research results in this paper would be valuable for further optimization and pushing to practical application of this machine.
作者
郭文杰
陆春月
闫玺铃
严绍进
王洪福
GUO Wen-jie;LU Chun-yue;YAN Xi-ling;YAN Shao-jin;WANG Hong-fu(School of Mechanical Engineering,North University of China,Taiyuan,Shanxi 030051;Crane Digital Design Engineering Technology Research Center of Shanxi Province,Taiyuan,Shanxi 030051)
出处
《液压与气动》
北大核心
2020年第4期103-109,共7页
Chinese Hydraulics & Pneumatics
基金
高校博士点专项科研基金(20131420120002)。
关键词
机械研磨试验机
振动特性
液压系统
数学模型
转阀
mechanical grinding machine
vibration characteristics
hydraulic system
mathematical model
rotary valve
