大尺寸圆柱振动体的耦合振动研究及有限元分析

发布时间：2018-01-02 16:21

本文关键词：大尺寸圆柱振动体的耦合振动研究及有限元分析　出处：《陕西师范大学》2015年硕士论文　论文类型：学位论文

【摘要】：塑料质地轻、具备一定的强度,同时具有耐霉菌、耐腐蚀、电绝缘性强,振动阻尼能力好,耐磨等优点,因此有着广泛的应用。目前,塑料在许多领域里已经成为了当代发展的新颖材料,提高了社会生产力。在生产大型复杂的热塑性塑料零件的过程中,由于模具尺寸和复杂状况有限,因此在生产过程中先通过模具将零件制出,再把多个塑料零件连接在一起,便有了许多种塑料连接方法。传统的塑料焊接方法有较多的缺点,影响焊件质量,对空气也有污染,生产效率较低。超声塑料焊接技术能够使塑料制品的发展加快,生产效率提高,减少环境污染,是一种先进的塑料连接技术。超声塑料焊接中的焊头根据焊件的不同有着不同的设计,有长方体、正方体、圆柱体等形状。焊头在工作过程中,要求做纵向振动,并且辐射面振幅能够均匀分布。当焊头的横向尺寸小于四分之一波长时,通常只考虑振动体的一维振动,即忽略横向振动对振动体的影响,用一维理论进行计算。当振动体的横向尺寸大于四分之一波长时,就要考虑到耦合作用的影响。如圆柱振动体的径向尺寸大于四分之一波长的时候,径向振动不能忽略,会干扰到振动体的纵向振动。在超声塑料焊接的应用中,焊头由大尺寸振动体制得,焊头在工作时会产生径向振动,导致影响辐射面的振幅分布,径向振动的影响会使振幅分布更加不均匀,影响焊件最终成品的效果。因此需要控制振幅分布来减小影响。用有限元方法对焊头进行设计分析,是一种方便精确的解决方法。在振动体上开槽是常见的控制振动的方法之一。本文开展的研究工作主要有：通过有限元软件ANSYS模拟分析大尺寸开槽圆柱振动体,探究振动体的纵向振动频率、辐射面振幅比与槽长度、槽宽度及槽的数量之间的关系,总结出变化规律,对开槽理论的进一步研究提供了基础。
[Abstract]:Plastic light texture, have a certain strength, and has the mildew resistance, corrosion resistance, electrical insulation, vibration damping capacity, wear resistance and other advantages, so it has been widely used. At present, plastic has become a novel material for contemporary development in many areas, improve the social productivity in the production process of large and complex. The thermoplastic plastic parts, because the mold size and complex conditions is limited, so in the production process will produce parts through the mold, and then a plurality of plastic parts connected together, have many kinds of connecting methods. The traditional welding methods of plastics have many disadvantages, influencing the welding quality. Is the air pollution, the production efficiency is relatively low. Ultrasonic plastic welding technology can make the development of plastic products faster, improve production efficiency, reduce environmental pollution, is a kind of advanced plastic connection technology of ultrasonic plastic welding. According to the welding of different welding with different design, a cuboid, cube, cylinder head shape. In the process of working, do longitudinal vibration, and the radiation surface. When the wave amplitude can be uniformly distributed transverse size of welding head less than four minutes long, usually only consider the one dimensional vibration of the vibrating body. Which ignores the effect of transverse vibration of vibrating body, using one-dimensional theoretical calculation. When the transverse size of the vibrating body is greater than the wave of four points long, we must take into account the impact of coupling effect. Such as when the radial dimension of the cylinder vibration body is greater than 1/4 wavelengths, the radial vibration can not be ignored, will disturb the longitudinal vibration of the vibrating body in the application of ultrasonic plastic welding, welding head by large size vibration system, welding head will produce radial vibration at work, due to the amplitude distribution of radiation surface, the effect of radial vibration will make the amplitude distribution With the uneven effects of welding the final effect. It is necessary to control the amplitude distribution to reduce the influence of the design and analysis of the welding head. With the finite element method is a convenient and accurate solution. In the vibration body slot is one of the common methods of vibration control. The main research works are: through Co. ANSYS software simulation analysis of large size slotted cylindrical body vibration, longitudinal vibration frequency of the vibrating body surface, radiation amplitude ratio and slot length, the relationship between the number of groove width and groove, summed up the changes, provide the basis for further research on Slotting theory.

【学位授予单位】：陕西师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG44

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