本文選題：阻尼 + 振動��； 參考：《中北大學(xué)》2013年碩士論文

【摘要】：氣缸套-活塞組是發(fā)動機中關(guān)鍵的摩擦副之一，其摩擦直接影響發(fā)動機的消耗功率、尾氣排放等因素。因此有必要對發(fā)動機氣缸套-活塞組之間摩擦力進(jìn)行測量。與傳統(tǒng)方法相比，“浮動氣缸套法”能更真實、更準(zhǔn)確地獲取發(fā)動機氣缸套-活塞組的摩擦力。但活塞側(cè)推力引起的氣缸套橫向振動對力傳感器測試精度的影響是該方法需要解決關(guān)鍵問題之一，利用阻尼減振器對其減振是一種可行的方法。本文采用有限元方法研究阻尼減振器對氣缸套振動衰減作用，并用有限元技術(shù)和試驗對此予以驗證。 利用三維建模軟件PRO/E建立試驗發(fā)動機氣缸套的三維實體模型，將實體模型導(dǎo)入ANSYS軟件中建立有限元模型。在有限元模型的建立中探討了實體模型的簡化和局部坐標(biāo)系，研究了氣缸套的約束模態(tài)，在試驗條件下氣缸套的振動及減振器阻尼和剛度的大小分別對氣缸套振動振幅的影響，提出了減振器阻尼和剛度參數(shù)確認(rèn)原則和減振器的設(shè)計原理及方案，利用有限元技術(shù)直接地和試驗間接地驗證減振器對氣缸套的振動振幅有衰減作用。 通過對氣缸套在試驗條件下的約束模態(tài)和振動響應(yīng)的研究，得出在試驗條件下氣缸套主體部分振動最大振幅發(fā)生位置，在最大振幅位置添加減振器。分別研究在試驗條件下當(dāng)減振器阻尼變化和剛度變化時氣缸套的減振效果。研究結(jié)果表明：當(dāng)減振器的剛度不變而阻尼增大時，氣缸套的減振效果增強，，但隨著阻尼的增大，氣缸套減振效果的趨勢在放緩；當(dāng)減振器的阻尼不變而剛度增大時，氣缸套的減振效果增強，但是增長的大小與此時減振器阻尼的大小密切相關(guān)，當(dāng)減振器阻尼越大時，相同的剛度變化引起氣缸套減振效果的變化就越大。據(jù)此提出了減振器參數(shù)確認(rèn)原則，進(jìn)而設(shè)計、制作了減振器。通過對比分析加裝減振器前后，氣缸套在共振時的振幅變化和力傳感器在試驗中測量數(shù)據(jù)的變化，兩者都驗證了減振器對氣缸套的振動振幅有衰減作用。
[Abstract]:The cylinder liner-piston unit is one of the key friction pairs in the engine, and its friction directly affects the engine power consumption and exhaust emission. Therefore, it is necessary to measure the friction between the cylinder liner and the piston group. Compared with the traditional method, the "floating cylinder sleeve method" can obtain the friction force of the engine cylinder liner-piston group more accurately and realistically. However, the influence of the lateral vibration of the cylinder sleeve caused by the piston side thrust on the measuring accuracy of the force sensor is one of the key problems to be solved in this method, and it is a feasible method to use the damping damper to reduce the vibration. In this paper, the effect of damping damper on the vibration attenuation of cylinder sleeve is studied by finite element method, which is verified by finite element technique and test. The three-dimensional solid model of the cylinder liner of the test engine was established by using the three-dimensional modeling software PRO/E, and the solid model was imported into the ANSYS software to establish the finite element model. In the process of establishing the finite element model, the simplification of the solid model and the local coordinate system are discussed. The constrained modes of the cylinder sleeve are studied. Under the experimental conditions, the vibration of the cylinder sleeve and the damping and stiffness of the damper affect the vibration amplitude of the cylinder sleeve, respectively. The principle of confirming damping and stiffness parameters of shock absorber and the design principle and scheme of shock absorber are put forward. The vibration amplitude of cylinder sleeve can be attenuated by using finite element technique directly and indirectly. Through the study of the constrained mode and vibration response of the cylinder sleeve under the test conditions, the position of the maximum vibration amplitude of the main part of the cylinder sleeve is obtained, and the vibration absorber is added at the maximum amplitude position. The vibration absorption effect of cylinder liner is studied under the experimental conditions when the damper damping and stiffness change. The results show that the damping effect of the cylinder liner increases when the stiffness of the damper is invariable and the damping increases, but with the increase of the damping, the trend of the damping effect of the cylinder sleeve slows down, and when the damping of the absorber increases, the stiffness of the cylinder liner increases. The damping effect of the cylinder liner is enhanced, but the increase is closely related to the damping of the damper. When the damper damping is greater, the same stiffness change will cause the greater the change of the damping effect of the cylinder sleeve. According to this, the principle of parameter confirmation of shock absorber is put forward, and the shock absorber is designed and manufactured. By comparing and analyzing the amplitude change of the cylinder sleeve during resonance and the change of the measured data of the force sensor in the experiment before and after the installation of the shock absorber, it is verified that the vibration amplitude of the cylinder sleeve is attenuated by the damper.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TK401;TB535.1

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本文編號：1920586