本文關(guān)鍵詞：大尺寸圓柱振動體的耦合振動研究及有限元分析　出處：《陜西師范大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 超聲塑料焊接 大尺寸圓柱體 耦合振動 有限元法

【摘要】：塑料質(zhì)地輕、具備一定的強度,同時具有耐霉菌、耐腐蝕、電絕緣性強,振動阻尼能力好,耐磨等優(yōu)點,因此有著廣泛的應(yīng)用。目前,塑料在許多領(lǐng)域里已經(jīng)成為了當代發(fā)展的新穎材料,提高了社會生產(chǎn)力。在生產(chǎn)大型復(fù)雜的熱塑性塑料零件的過程中,由于模具尺寸和復(fù)雜狀況有限,因此在生產(chǎn)過程中先通過模具將零件制出,再把多個塑料零件連接在一起,便有了許多種塑料連接方法。傳統(tǒng)的塑料焊接方法有較多的缺點,影響焊件質(zhì)量,對空氣也有污染,生產(chǎn)效率較低。超聲塑料焊接技術(shù)能夠使塑料制品的發(fā)展加快,生產(chǎn)效率提高,減少環(huán)境污染,是一種先進的塑料連接技術(shù)。超聲塑料焊接中的焊頭根據(jù)焊件的不同有著不同的設(shè)計,有長方體、正方體、圓柱體等形狀。焊頭在工作過程中,要求做縱向振動,并且輻射面振幅能夠均勻分布。當焊頭的橫向尺寸小于四分之一波長時,通常只考慮振動體的一維振動,即忽略橫向振動對振動體的影響,用一維理論進行計算。當振動體的橫向尺寸大于四分之一波長時,就要考慮到耦合作用的影響。如圓柱振動體的徑向尺寸大于四分之一波長的時候,徑向振動不能忽略,會干擾到振動體的縱向振動。在超聲塑料焊接的應(yīng)用中,焊頭由大尺寸振動體制得,焊頭在工作時會產(chǎn)生徑向振動,導(dǎo)致影響輻射面的振幅分布,徑向振動的影響會使振幅分布更加不均勻,影響焊件最終成品的效果。因此需要控制振幅分布來減小影響。用有限元方法對焊頭進行設(shè)計分析,是一種方便精確的解決方法。在振動體上開槽是常見的控制振動的方法之一。本文開展的研究工作主要有：通過有限元軟件ANSYS模擬分析大尺寸開槽圓柱振動體,探究振動體的縱向振動頻率、輻射面振幅比與槽長度、槽寬度及槽的數(shù)量之間的關(guān)系,總結(jié)出變化規(guī)律,對開槽理論的進一步研究提供了基礎(chǔ)。
[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.

【學(xué)位授予單位】：陜西師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG44

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本文編號：1370015