本文選題：薄壁件　切入點(diǎn)：移動(dòng)載荷　出處：《山東大學(xué)》2017年碩士論文

【摘要】：隨著現(xiàn)代工業(yè)的發(fā)展,薄壁零件在航空航天、汽車、能源等眾多領(lǐng)域應(yīng)用日益廣泛,薄壁件加工質(zhì)量和加工效率的要求也越來越高。由于薄壁零件剛度較低,在加工過程中會(huì)出現(xiàn)強(qiáng)烈的強(qiáng)迫振動(dòng)甚至顫振。這將嚴(yán)重影響工件表面加工質(zhì)量,并限制材料移除效率。本文圍繞薄壁零件銑削動(dòng)力學(xué)模型,借助理論分析和實(shí)驗(yàn)研究等手段,識(shí)別其瞬時(shí)動(dòng)態(tài)特性,預(yù)測(cè)薄壁零件在銑削力作用下的強(qiáng)迫振動(dòng)、銑削穩(wěn)定性,并提出抑制加工振動(dòng)的方法。首先,提出一種薄板受移動(dòng)載荷作用時(shí)振動(dòng)響應(yīng)的預(yù)測(cè)方法。該方法基于利茲法和拉格朗日方程建立薄板在移動(dòng)載荷作用下的動(dòng)力學(xué)模型,采用Courant罰參數(shù)法處理實(shí)際工件所具有的復(fù)雜邊界條件,利用微分求積法求解系統(tǒng)運(yùn)動(dòng)方程。其次,研究薄壁件銑削強(qiáng)迫振動(dòng)響應(yīng)。將刀具沿切削路徑移動(dòng)引起的銑削力作為移動(dòng)載荷,將移除材料對(duì)系統(tǒng)響應(yīng)的影響通過負(fù)動(dòng)能和負(fù)應(yīng)變能表示,研究考慮材料移除效應(yīng)影響的變厚度薄壁零件在銑削力作用下的強(qiáng)迫響應(yīng)。然后,提出時(shí)空離散穩(wěn)定性預(yù)測(cè)方法預(yù)測(cè)薄壁件銑削位置依賴的切削穩(wěn)定性�；谶B續(xù)體動(dòng)力學(xué)理論,研究薄壁件銑削系統(tǒng)位置依賴的動(dòng)態(tài)特性,提出薄壁件銑削位置依賴的時(shí)空離散穩(wěn)定性預(yù)測(cè)方法。為了獲得系統(tǒng)能量方程并進(jìn)一步推導(dǎo)系統(tǒng)頻響函數(shù),采用結(jié)構(gòu)阻尼代替阻尼比用于分析阻尼對(duì)系統(tǒng)動(dòng)態(tài)特性的影響;在獲得系統(tǒng)頻響函數(shù)基礎(chǔ)上,研究邊界條件、模態(tài)振型、刀具位置對(duì)系統(tǒng)模態(tài)參數(shù)和穩(wěn)定性的影響。此外,研究多模態(tài)對(duì)薄壁件動(dòng)態(tài)特性的影響,針對(duì)各階模態(tài)參數(shù)之間的關(guān)系,提出多模態(tài)銑削穩(wěn)定性預(yù)測(cè)方法。最后,提出基于約束阻尼結(jié)構(gòu)的薄壁件銑削振動(dòng)抑制方法。為了抑制加工過程中弱剛度部件的振動(dòng),將約束阻尼結(jié)構(gòu)用于大懸伸比鏜刀和薄壁零件,建立約束阻尼鏜刀和約束阻尼薄壁件動(dòng)力學(xué)模型,通過實(shí)驗(yàn)驗(yàn)證理論模型的正確性和約束阻尼結(jié)構(gòu)的阻尼性能。此外,研究約束阻尼結(jié)構(gòu)尺寸參數(shù)對(duì)阻尼性能的影響。
[Abstract]:With the development of modern industry, thin-walled parts are widely used in many fields, such as aerospace, automobile, energy and so on. There will be strong forced vibration or even chatter in the process of machining, which will seriously affect the quality of workpiece surface processing and limit the efficiency of material removal. This paper focuses on the milling dynamics model of thin-walled parts by means of theoretical analysis and experimental research. Identify its instantaneous dynamic characteristics, predict the forced vibration of thin-walled parts under milling force, milling stability, and put forward a method to suppress machining vibration. A method for predicting the vibration response of thin plates subjected to moving loads is proposed. The dynamic model of thin plates under moving loads is established based on the Leeds method and Lagrange equation. The Courant penalty parameter method is used to deal with the complex boundary conditions of the actual workpiece, and the differential quadrature method is used to solve the equations of motion of the system. The forced vibration response of thin-walled milling is studied. The milling force caused by the tool moving along the cutting path is taken as the moving load, and the influence of the removed material on the system response is expressed by negative kinetic energy and negative strain energy. The forced response of thin-walled parts with variable thickness under milling force considering the effect of material removal is studied. A spatio-temporal discrete stability prediction method is proposed to predict the position dependent cutting stability of thin-walled milling. Based on continuum dynamics theory, the dynamic characteristics of position dependence of thin-walled milling system are studied. In order to obtain the energy equation of the system and to deduce the frequency response function of the system, the influence of damping on the dynamic characteristics of the system is analyzed by using the damping ratio instead of the damping ratio. On the basis of obtaining the frequency response function of the system, the effects of boundary conditions, modal modes and tool positions on the modal parameters and stability of the system are studied. In addition, the effects of multi-mode on the dynamic characteristics of thin-walled parts are studied. According to the relationship between various modal parameters, a multi-mode milling stability prediction method is proposed. Finally, a vibration suppression method for thin-walled parts based on constrained damping structure is proposed. The constrained damping structure is applied to the large suspension ratio boring tool and thin-walled parts, and the dynamic model of constrained damping boring tool and constrained damping thin-walled part is established. The correctness of the theoretical model and the damping performance of constrained damping structure are verified by experiments. The effect of size parameters of constrained damping structure on damping performance is studied.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG54

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