铲斗振动掘削岩土分析与岩土固有频率的估测方法-中南大学学报.pdfVIP

第 38 卷第 3 期 中南大学学报( 自然科学版) Vol.38 No.3 2007 年 6 月 J. Cent. South Univ. (Science and Technology) Jun. 2007 铲斗振动掘削岩土分析与岩土固有频率的估测方法 朱建新，赵崇友，胡火焰，邹湘伏 ( 中南大学 机电工程学院，湖南 长沙，410083) 摘 要：利用铲斗液压缸的工作压力模拟液压挖掘机铲斗挖掘工作时的阻力情况；对振动掘削与普通掘削的掘削 效果进行对比实验研究；以共振理论为出发点，结合实验结果分析岩土共振对振动掘削过程的影响；应用共振理 论，通过激振频率对比实验，采集多个频率下铲斗的最大挖掘阻力，利用最小二乘法确定岩土颗粒的固有频率。 研究结果表明，振动掘削相对于普通掘削在减小挖掘阻力方面效果显著；当铲斗激振频率与岩土颗粒固有频率接 近时，铲斗挖掘阻力最小。 关键词：液压挖掘机；振动掘削；共振；拟合；岩土固有频率 中图分类号：TU621 文献标识码：A 文章编号：1672-7207(2007)03−0507−05 Analysis of bucket vibratory excavate rock and measuring method of rock’s natural frequency ZHU Jian-xin, ZHAO Chong-you, HU Huo-yan, ZOU Xiang-fu (School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China) Abstract: Bucket hydraulic cylinder’s working pressure was used to simulate the digging resistance of hydraulic excavator. A contrast experiment research was made between the effect of vibratory excavation and normal excavation. Based on resonance theory and experiment results, the effect of the process of vibratory excavation produced by rock resonance was analysed. The resonance theory and the contrast experiment of inspiring frequency were used to collect maximum digging resistance at different frequencies, least square method was used to obtain the rock’s natural frequency. It indicates that vibratory rock cutting can greatly reduce the digging resistance compared to normal rock cutting, the digging resistance of bucket comes to its least when the bucket’s inspiring frequency is close to the rock’s natural frequency. Key words: hydraulic excavators; vi