振动拉削双阀激振系统输出波形稳定性分析及实验研究

发布时间：2019-03-01 07:11

【摘要】：为了分析振动拉削系统在加工过程中电液激振输出幅值稳定性问题,首先引入流量耦合线性模型和拉削负载力模型,构建了双阀激振系统的传递函数,推导了系统输出位移和输出力的时域响应函数;再利用MATLAB仿真计算及绘制开环系统的Bode图和幅值时域响应曲线;最后,利用自行研制的振动拉削实验平台所测得的激振器输出幅值与仿真结果进行对比分析,研究结果表明:激振信号的频率会影响输出波形的平衡位置及波动幅值,激振信号频率越高,输出波形越容易调节;而拉削负载力主要影响输出波形的振荡次数,负载力越大,输出波形越不稳定。因此,为了使拉削过程中激振输出波形更加稳定,一方面可适当提高激振缸缸径和行程的比值,以增大系统极限响应频率,另一方面需蓄能装置或大流量型开关阀平衡激振缸容腔压力配比。
[Abstract]:In order to analyze the stability of electro-hydraulic excitation output amplitude in vibration broaching system, the flow coupling linear model and broaching load model are introduced firstly, and the transfer function of double valve excitation system is constructed. The time domain response functions of the output displacement and output force of the system are derived. Then the Bode diagram and amplitude time-domain response curve of open-loop system are calculated and plotted by MATLAB simulation. Finally, the output amplitude of the vibration exciter measured by the self-developed vibration broaching experiment platform is compared with the simulation results. The results show that the frequency of the excitation signal will affect the balance position and the fluctuation amplitude of the output waveform. The higher the frequency of excitation signal, the easier to adjust the output waveform. The load force of broaching mainly affects the oscillation times of the output waveform, and the larger the load force, the more unstable the output waveform is. Therefore, in order to make the exciting output waveform more stable in the broaching process, on the one hand, the ratio of cylinder diameter to stroke can be increased appropriately, so as to increase the limit response frequency of the system. On the other hand, energy storage device or large-flow on-off valve is required to balance the pressure ratio of the cylinder cavity.
【作者单位】：杭州电子科技大学机械工程学院;浙江理工大学机械与自动控制学院;
【基金】：国家自然科学基金资助项目(51375129) 浙江理工大学521人才培养计划资助
【分类号】：TG57

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