反共振振动筛的几个关键技术及仿真研究

发布时间：2018-10-22 07:06

【摘要】：振动机械的应用十分广泛,反共振振动机械比传统的振动机械有更好的工作性能。虽然反共振振动理论得到了很多的研究,但是用于生产实践的反共振振动机械还不成熟。反共振振动机械是一类新型的振动机械,它以反共振原理为基础,当工作在反共振点时,其对应的隔振系统振幅将为极小值,而工作机体却可正常工作。反共振振动机械具有比传统的振动机械更大的优越性,现已成为人们研究的热点。本文以反共振振动筛为研究对象,针对设计制造过程中的几个关键技术进行了仿真研究,并对某些结构作了改进。首先,设计了两种振动筛结构,通过有限元静力学分析确定了哪种结构能更好的满足制造工艺及使用要求,检验结构设计的合理性,对不合理的结构进行改进。之后利用有限元方法对振动筛进行动力学分析。包括利用谐响应分析预测反共振点的位置；之后在反共振频率下,进行简谐力作用下的振动筛的瞬态分析,观察反共振现象及动态应力。由于传统的静力学分析方法存在一定的不足,因此实验了两种新的静力学分析的方法,并比较了三种方法的计算结果。整体分析时对板弹簧座结构作了简化,因此计算获得的板弹簧应力不准确,为获得板弹簧座的准确应力情况,单独对板弹簧组件进行了分析。之后根据分析结果对结构进行了疲劳寿命计算。最后,研究了一种金属橡胶复合板弹簧,对其动刚度、静刚度、应力的变化情况进行了分析计算。计算结果表明,复合弹簧的刚度有较大增加,刚度随着橡胶材料的硬度增大而增大,且在工作情况下刚度仍呈线性关系。因此,在满足刚度、应力要求的情况下应用复合弹簧可以减小弹簧的厚度,有利于结构的紧凑。
[Abstract]:Vibration machinery is widely used, and antiresonance vibration machinery has better performance than traditional vibration machinery. Although antiresonance vibration theory has been studied a lot, antiresonance vibration machinery used in production practice is still immature. Antiresonance vibration machinery is a new type of vibration machinery, which is based on the antiresonance principle. When working at the antiresonance point, the amplitude of the corresponding isolation system will be minimized, while the working block can work normally. Antiresonance vibration machine has more advantages than traditional vibration machinery, and has become a hot research topic. In this paper, the antiresonance vibrating screen is taken as the research object, and some key technologies in the process of design and manufacture are simulated and studied, and some structures are improved. Firstly, two kinds of vibrating screen structures are designed. Through finite element statics analysis, we determine which structure can better meet the requirements of manufacturing process and use, check the rationality of structural design, and improve the unreasonable structure. Then the finite element method is used to analyze the dynamics of the vibrating screen. The harmonic response analysis is used to predict the position of the antiresonance point and the transient analysis of the vibrating screen under the simple harmonic force is carried out at the antiresonance frequency to observe the antiresonance phenomenon and the dynamic stress. Because the traditional statics analysis method has some shortcomings, two new statics analysis methods are experimented, and the results of the three methods are compared. The structure of the plate spring pedestal is simplified during the whole analysis, so the plate spring stress obtained by calculation is not accurate. In order to obtain the accurate stress of the plate spring seat, the plate spring assembly is analyzed separately. Then the fatigue life of the structure is calculated according to the analysis results. Finally, the dynamic stiffness, static stiffness and stress of a metal rubber composite plate spring are analyzed and calculated. The results show that the stiffness of the composite spring increases greatly, and the stiffness increases with the increase of the hardness of the rubber material, and the stiffness of the composite spring is still linearly related to the working conditions. Therefore, when the stiffness and stress are satisfied, the thickness of the spring can be reduced by using the composite spring, which is advantageous to the compactness of the structure.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH237.6

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