激振技术波形饱和度研究  

Waveform Saturation of Electro-hydraulic Excitation Technology

作　　者：韩冬[1] 龚国芳[1] 刘毅[1] 杨华勇[1] 

机构地区：[1]浙江大学流体动力与机电系统国家重点实验室,杭州310027

出　　处：《农业机械学报》2014年第2期334-339,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(51275499);国家自然科学基金创新研究群体科学基金资助项目(51221004);国家重点基础研究发展计划(973计划)资助项目(2013CB035404)

摘　　要：针对液压激振与夹持独立的捣固装置,设计一种由阀芯旋转式四通换向阀和微行程双作用液压缸组成的电液激振器,阐述其结构及工作过程,利用转阀矩形阀口的二级节流原理进行理论建模和实验验证。首次提出了饱和度概念,并从工作频率和阀口轴向长度两个方面综合分析和优化振动波形的饱和度。仿真实验表明,系统的惯性力使振动位移曲线基本对称,通过调节合适的工作频率和阀口轴向长度,可以获得一定幅值和斜率的三角波、正弦波或者梯形波。阀口轴向长度的增大或者工作频率降低使波形饱和度增大,且饱和度和阀口轴向长度呈非线性关系,非线性程度随着工作频率的提高而降低。Based on the tamping device with hydraulic excitation and independent clamping movement, an electro-hydraulic exciter composed of spin valve and micro-displacement double-functioned hydraulic cylinder is designed. Considering the working principle of the electro-hydraulic exciter, a theoretical model is established according to the two throttles principle and the related experiments are validated. According to the analysis of excited waveforms, the conception of saturation is first proposed. In addition, saturation of excited waveforms is analyzed and optimized through working frequency and axial length of orifice. The results indicate that the waveforms are approximately symmetrical because of inertial force and certain amplitude and slope of triangle wave, and sine wave and trapezoidal wave are achieved through adjusting suitable working frequency and axial length of orifice. Besides, axial length of orifice increasing or working frequency decreasing leads to increase of saturation. Saturation and axial length of orifice are nonlinearly related. Nonlinearity decreases with the increase of working frequency.

关 键 词：电液激振器 饱和度 工作频率 阀口轴向长度 

分 类 号：TH137[机械工程—机械制造及自动化]