共振破碎机振动系统的动力学研究

发布时间：2019-04-26 06:55

【摘要】：目前水泥混凝土路面的修缮与改建工程越来越多,采取的维修改造措施包括“白加白”、“白加黑”或“白改黑”,但在施工后经常会发生反射裂缝,达不到预想的使用效果。为此,国外提出了共振碎石化技术,该技术可以有效消除反射裂缝,提高路面的使用寿命。因此,国内亟需对共振碎石化技术和设备进行研究。本论文基于对水泥混凝土路面自振频率和共振破碎机振动系统的研究,结合多体系统动力学理论,运用虚拟样机技术,对共振破碎机的振动系统进行动力学仿真研究。首先,本文在分析共振碎石化过程的基础上,根据振动理论和薄板理论推导了水泥混凝土路面的振动响应方程,并求解得到温克勒地基上面板在不同边界条件下的固有频率计算公式;计算不同边界条件下面板的固有频率,分析在不同地基反应模量、不同厚度和不同长度条件下,面板固有频率的变化趋势。本文还描述了振动系统的简化模型,在此基础上对梁的受力做了详细分析,并推导出梁在振动过程中的动力学方程;建立了梁的有限元模型后,导入ANSYS软件中进行自由模态分析,选取了第七阶模态的固有频率与振型,并确定了定位孔的位置。最后,建立振动系统的刚柔多体混合动力学仿真模型,通过分析仿真结果,验证了共振破碎机振动系统工作原理的可行性和定位点选取的合理性,并确定振动系统的振动特性;建立水泥面仿真模型,形成完整的振动破碎动力学模型,分析仿真结果得到不同激振频率对系统破碎性能的影响。本文利用仿真分析软件ADAMS对共振破碎机振动系统和路面破碎过程进行了动力学仿真分析,对系统的性能有了一定了解,为共振破碎机的实际生产制造提供了相对可靠的数据支持。
[Abstract]:At present, there are more and more repair and reconstruction projects of cement concrete pavement. The measures adopted include "white plus white", "white plus black" or "white to black", but reflection cracks often occur after construction, which can not achieve the expected use effect. Therefore, the resonance crushing technology is put forward abroad, which can effectively eliminate the reflective cracks and prolong the service life of the pavement. Therefore, it is urgent to study the resonance crushing technology and equipment in our country. Based on the study of the natural vibration frequency of cement concrete pavement and the vibration system of the resonance crusher, the dynamic simulation of the vibration system of the resonance crusher is carried out by using the virtual prototype technology and the multi-body system dynamics theory. Firstly, on the basis of analyzing the process of resonance crushing, the vibration response equation of cement concrete pavement is deduced according to the vibration theory and thin plate theory. The formulas for calculating the natural frequencies of the slab on the Winkler foundation under different boundary conditions are obtained. The natural frequency of the panel under different boundary conditions is calculated and the change trend of the natural frequency of the panel under the conditions of different foundation response modulus, different thickness and different length is analyzed. The simplified model of vibration system is also described in this paper. On the basis of this, the force of beam is analyzed in detail, and the dynamic equation of beam in vibration process is deduced. After the finite element model of the beam is established, the free modal analysis is carried out in ANSYS software, the natural frequency and mode shape of the seventh modal are selected, and the location of the locating hole is determined. Finally, the rigid-flexible multi-body hybrid dynamics simulation model of the vibration system is established. Through the analysis of the simulation results, the feasibility of the working principle of the vibration system of the resonance crusher and the rationality of the selection of the positioning point are verified, and the vibration characteristics of the vibration system are determined. The cement surface simulation model is established to form a complete dynamic model of vibration crushing. The effects of different excitation frequencies on the crushing performance of the system are obtained by analyzing the simulation results. In this paper, the dynamic simulation of vibration system and road surface crushing process of resonance crusher is carried out by using simulation and analysis software ADAMS, and the performance of the system is understood to some extent. It provides a relatively reliable data support for the actual production of the resonance crusher.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U418.32

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