基于Workbench的声频钻机动力头隔振特性分析

Analysis of vibration isolation characteristics of the sonic drill power head based on Workbench

声频动力头的隔振是保证其能否安全稳定工作的关键,本文基于单自由度系统有阻尼受迫振动理论建立了动力头隔振机构受迫振动模型,发现隔振橡胶刚度k、阻尼c以及施加外部激励力频率w等是影响动力头隔振性能的主要因素;在此基础上建立动力头的动力学模型,对其进行振动特性仿真研究。研究结果显示,动力头的隔振传递率与外部施加的激励力频率成正比,与隔振弹簧刚度成反比,与隔振弹簧阻尼成正比,且当弹簧刚度增大到一定值时,隔振传递率趋于定值。因此在实际工作时,可通过适当提高外部激励频率,隔振弹簧选择刚度较小、阻尼较大的橡胶材料等方法,以提高动力头隔振性能。研究结论可为设定声频钻机工作频率、优化设计动力头隔振机构等提供参考。

Vibration isolation of the sonic power head of is the key to ensure whether it can work safely and stably.In this paper,the forced vibration model of the power head isolation mechanism is established based on the damped forced vibration theory of the single⁃degree⁃freedom system,and it is found that the rubber stiffness k,damping c and frequency w of the external excitation force are the main factors affecting the vibration isolation performance of the power head.On this basis,the dynamic model of the power head is established to simulate its vibration characteristics.The results show that the vibration isolation transfer rate of the power head is proportional to the frequency of the external excitation force,inversely proportional to the stiffness of the vibration isolation spring,and proportional to the damping of the vibration isolation spring.When the stiffness of the spring increases to a certain value,the vibration isolation transfer rate tends to a constant value.Therefore,in practice,the vibration isolation performance of the power head can be improved by appropriately increasing the external excitation frequency and choosing rubber material with low stiffness and large damping for the vibration isolation spring.The conclusions can provide reference for setting the working frequency of the sonic drill and optimizing the vibration isolation mechanism of the power head.