發(fā)布時(shí)間：2018-04-04 10:55

  本文選題：減震器　切入點(diǎn)：阻尼特性　出處：《江蘇科技大學(xué)》2016年碩士論文

【摘要】：摩托車是現(xiàn)代化的交通工具之一,從其被發(fā)明到使用至今,已有一百多年的歷史。因?yàn)槠浔憬莸鸟{駛方式和很好的路面適應(yīng)性,仍然有很大市場。摩托車的減震效果直接影響著摩托車行駛過程中的平穩(wěn)性、安全性和人們的舒適度,而減震器就是起到減震作用的重要器件,因此減震器的設(shè)計(jì)尤為重要。近年來,隨著計(jì)算機(jī)技術(shù)的發(fā)展,傳統(tǒng)的減震器的設(shè)計(jì)方法得到一定的改良,但是仍然沒有脫離經(jīng)驗(yàn)設(shè)計(jì)的方法。本文完成了對WH150型摩托車雙筒液壓后減震器的參數(shù)化數(shù)學(xué)建模與仿真。利用流體力學(xué)理論,建立閥系的上下壓差與油液流經(jīng)該閥系的流量的數(shù)學(xué)關(guān)系表達(dá)式,同時(shí)根據(jù)油膜邊界理論,得出摩擦力數(shù)學(xué)計(jì)算公式。在此基礎(chǔ)上利用MATLAB/Simulink建立數(shù)學(xué)模型并且進(jìn)行仿真。因所建參數(shù)化模型是基于減震器的實(shí)際結(jié)構(gòu)參數(shù),所以該數(shù)學(xué)模型可以反映減震器實(shí)際的工作過程。通過仿真結(jié)果與實(shí)際測試結(jié)果之間的誤差分析,驗(yàn)證了所建數(shù)學(xué)參數(shù)模型正確性。本文完成了對減震器內(nèi)部閥系節(jié)流環(huán)形閥片的撓度變形的理論分析和計(jì)算。根據(jù)彈性力學(xué)對小撓度變形計(jì)算方法進(jìn)行具體過程論述,推導(dǎo)出小撓度變形解析式。利用錢氏攝動(dòng)法推導(dǎo)出減震器環(huán)形閥片大撓度通用解析式,同時(shí)給出一種基于有限元的求解大撓度通用解析式系數(shù)的方法,并且將所得結(jié)果與《機(jī)械設(shè)計(jì)手冊》查表計(jì)算所得結(jié)果進(jìn)行比較分析,得出相對誤差很小,驗(yàn)證了本文方法的正確性。針對減震器內(nèi)部流場的復(fù)雜性,借助計(jì)算機(jī)仿真,利用ANSYS Fluent軟件,模擬了減震器的內(nèi)部流場。基于流體力學(xué)理論,利用數(shù)值模擬分析的方法對減震器內(nèi)部流場進(jìn)行分析描述,揭示了流體運(yùn)動(dòng)規(guī)律和減震器參數(shù)對流場的影響。
[Abstract]:Motorcycle is one of the modern means of transportation. It has a history of more than 100 years since it was invented and used.Because of its convenient driving mode and good road adaptability, there is still a large market.The shock absorption effect of motorcycle has a direct impact on the ride stability, safety and people's comfort, and the shock absorber is an important device to reduce the vibration, so the design of the shock absorber is particularly important.In recent years, with the development of computer technology, the traditional design method of shock absorber has been improved to a certain extent, but there is still no method without experience design.In this paper, the parameterized mathematical modeling and simulation of double cylinder hydraulic shock absorber for WH150 motorcycle are completed.Based on the theory of fluid mechanics, the mathematical expression of the pressure difference between the upper and lower pressure of the valve system and the flow rate of oil flowing through the valve system is established. At the same time, according to the oil film boundary theory, the mathematical formula of friction force is obtained.On the basis of this, the mathematical model is established by MATLAB/Simulink and the simulation is carried out.Because the parameterized model is based on the actual structural parameters of the shock absorber, the mathematical model can reflect the actual working process of the absorber.The correctness of the mathematical parameter model is verified by the error analysis between the simulation results and the actual test results.In this paper, the theoretical analysis and calculation of the deflection of the throttle ring valve plate in the internal valve system of the shock absorber have been completed.According to elastic mechanics, the calculation method of small deflection deformation is discussed in detail, and the analytical formula of small deflection deformation is deduced.The general analytical formula for large deflection of annular valve piece of shock absorber is derived by using the Cheen's perturbation method, and a method of solving the general analytical coefficient of large deflection based on finite element method is given.The results obtained are compared with the results obtained from the table checking in the Manual of Mechanical Design, and the relative error is very small, which verifies the correctness of the method presented in this paper.In view of the complexity of the internal flow field of the shock absorber, the internal flow field of the absorber is simulated by means of computer simulation and ANSYS Fluent software.Based on the theory of fluid mechanics, the flow field inside the shock absorber is analyzed and described by means of numerical simulation analysis, and the influence of fluid motion law and the flow field of shock absorber parameters is revealed.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U483

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