本文選題：金屬波紋管 + 激振頻率　； 參考：《河南科技大學》2013年碩士論文

【摘要】：金屬波紋管是一類圓柱形薄壁的彈性殼體，其橫向帶有波紋，在管路系統(tǒng)中主要起到減振降噪的作用。在實際工況中，為了提高金屬波紋管的減振降噪效果，需要對其隔振特性進行研究。 本文以DN219金屬波紋管為對象，采用數(shù)值仿真和試驗相結合的方法進行研究。利用ANSYS有限元分析軟件建立了金屬波紋管的有限元模型，，研究幾何參數(shù)、結構構型及阻尼材料特性對金屬波紋管減振效果的影響，最后通過試驗對模型進行驗證。仿真結果表明：當激振頻率為40Hz時，該金屬波紋管的減振效果隨著波高及波數(shù)的增加而增大，隨著波距、壁厚、直徑及阻尼材料的彈性模量的增加而減小，隨著阻尼材料的厚度的增加先增大后減小；當激振頻率為13.5Hz時，該金屬波紋管的減振效果隨著波高、波距、壁厚、直徑、波數(shù)及阻尼材料的彈性模量的增加先減小后增大。金屬波紋管減振效果與阻尼材料薄厚的關系比較復雜。當阻尼材料厚度小于0.1mm時，隨著阻尼材料厚度的增加而減小，阻尼材料厚度大于0.1mm小于0.2mm時，隨著阻尼材料厚度的增加而增大，阻尼材料厚度大于0.2mm小于0.3mm時，隨著阻尼材料厚度的增加而減小，阻尼材料厚度大于0.3mm時，隨著阻尼材料厚度的增加而增大；當激振頻率為5Hz時，該金屬波紋管的減振效果隨著波高及波數(shù)的增加而減小，隨著波距、壁厚、直徑及阻尼材料的彈性模量的增加而增大，隨著阻尼材料的厚度的增加先減小后增大。 接著對DN219金屬波紋管進行振動試驗研究，將試驗得到的結果和有限元分析的結果進行對比，得知兩者之差在工程上可接受的范圍之內(nèi)，從而驗證了有限元模型的正確性。本文研究結果對金屬波紋管的設計具有一定的參考價值。 本文還對DN550金屬波紋管進行了試驗研究，分別采用負脈沖法和錘擊法對無粘性阻尼金屬波紋管進行自由振動試驗，比較兩者的激振效果得知，錘擊法雖然試驗方便、花費少，但其能量有限且不易控制，對于輕型結構系統(tǒng)可以采用，對大型高剛度的撓性接管就不宜采用；而負脈沖法能夠較穩(wěn)定地輸入沖擊能量，可以充分激發(fā)出所關注的共振頻率。當層與層之間加入粘性阻尼材料以后，動態(tài)剛度和阻尼系數(shù)降低，這主要是由于撓性接管層間摩擦阻尼大于粘性材料的阻尼；試驗還表明層間粘性阻尼材料可有效衰減高頻振動。
[Abstract]:Metal corrugated tube is a kind of cylindrical thin-walled elastic shell with transverse corrugation, which plays an important role in reducing vibration and noise in pipeline system. In order to improve the vibration and noise reduction effect of metal bellows, the vibration isolation characteristics of metal bellows need to be studied. In this paper, DN219 metal bellows are studied by numerical simulation and experiment. The finite element model of metal bellows is established by using ANSYS finite element analysis software. The effects of geometric parameters, structural configuration and damping material characteristics on the damping effect of metal bellows are studied. Finally, the model is verified by experiments. The simulation results show that when the exciting frequency is 40 Hz, the damping effect of the metal corrugated tube increases with the increase of wave height and wave number, and decreases with the increase of wave distance, wall thickness, diameter and elastic modulus of damping material. With the increase of damping material thickness, the damping effect of the metal corrugated tube first increases and then decreases with the increase of wave height, wave distance, wall thickness, diameter, wave-number and elastic modulus of damping material when the exciting frequency is 13.5 Hz, and then increases with the increase of wave height, wave distance, wall thickness, wave number and elastic modulus of damping material. The relation between the damping effect of metal bellows and the thickness of damping material is complex. When the thickness of damping material is less than 0.1mm, the thickness of damping material decreases with the increase of thickness of damping material. When the thickness of damping material is greater than 0.1mm less than 0.2mm, the thickness of damping material increases with the increase of thickness of damping material, and when the thickness of damping material is greater than that of 0.2mm, the thickness of damping material is smaller than 0.3mm. When the damping material thickness is greater than 0.3mm, the damping material thickness increases with the increase of damping material thickness, and the damping effect of the metal bellows decreases with the increase of wave height and wave number when the exciting frequency is 5 Hz. With the increase of wave distance, wall thickness, diameter and elastic modulus of damping materials, the thickness of damping materials decreases first and then increases. Then the vibration test of DN219 metal bellows is carried out, and the results obtained from the test are compared with the results of finite element analysis, and the difference between the two is found to be within an acceptable range in engineering, which verifies the correctness of the finite element model. The results of this paper have some reference value for the design of metal bellows. The experiments of DN550 metal bellows are also carried out in this paper. The free vibration tests of non-viscous damped metal bellows are carried out by using negative pulse method and hammering method, respectively. The results show that the hammering method is convenient in test and less in cost. However, its energy is limited and difficult to control, so it can be used for light structure system, but not for large flexible nozzle with high stiffness, while the negative pulse method can input shock energy stably, which can fully excite the resonance frequency concerned. When viscous damping material is added between layers, the dynamic stiffness and damping coefficient decrease, which is mainly due to the fact that the friction damping between the flexible pipes is larger than that of the viscous material. The experiment also shows that the interlayer viscous damping material can effectively attenuate the high frequency vibration.
【學位授予單位】：河南科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TB535

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