基于有限元和试验模态分析的振动筛动力学参数研究

Study to the Dynamic Parameters of the Vibration Screen Based on the Analysis to the Finite Element and Testing Mode

以PDZS型平动椭圆振动筛为计算实例,建立了筛箱系统动态特性分析的有限元模型,用工程分析软件Pro/Mechanica对筛箱的动态特性作分析研究,计算了筛箱的低阶固有频率、模态振型;应用试验模态分析技术,采用一点激振,多点拾振的测试方法,对整体振动筛进行了实测,获得了振动筛固有频率、阻尼比和主振型,为钻井振动筛动力学设计和动力学修改提供了参考。

The PDZS type translation elliptical vibration screen serving as the calculation example, the paper establishes the finite element model for analyzing the dynamic characteristic of the screen box system, makes the analytical study to the dynamic characteristic of the screen box with the engineering analysis software Pro / Mechanica, calculates the low-order natural frequency and modal vibration shapes of the screen box. In addition, applying the testing modal analysis technique and the testing approach that is the vibration is excited at one point and picked up at multi-point, it makes actual measurement to the whole vibration screen, thus gets the natural frequency, damping ratio and main vibration type of the vibration screen, which offers the reference for the dynamic design and the dynamic improvement to the drilling vibration screen.