本文關(guān)鍵詞： 參數(shù)識別 懸臂梁模型 結(jié)合面 動態(tài)特性　出處：《寧夏大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著先進(jìn)制造業(yè)加工水平的不斷提升,各個行業(yè)對機(jī)械設(shè)備的動態(tài)性能要求也越來越高。而機(jī)械結(jié)合面作為機(jī)械結(jié)構(gòu)中一種固有的結(jié)構(gòu),其動態(tài)特性對整機(jī)的動態(tài)性能有著顯著的影響。以機(jī)床為例,有資料表明,機(jī)床總剛度的60%-80%和總阻尼的90%都是來源于結(jié)合面。在進(jìn)行機(jī)械結(jié)構(gòu)的動態(tài)設(shè)計時,能否獲得正確的結(jié)合面動態(tài)參數(shù)是建立準(zhǔn)確機(jī)械結(jié)構(gòu)動力學(xué)模型的關(guān)鍵所在。因此,結(jié)合面的動力學(xué)建模與參數(shù)識別一直都是值得研究的課題�；谶@一關(guān)鍵問題,本文進(jìn)行了如下研究：首先,系統(tǒng)的總結(jié)了當(dāng)前有關(guān)機(jī)械結(jié)合面特性的研究工作,在此基礎(chǔ)上設(shè)計了一種含有固定結(jié)合面的懸臂梁測試模型。 然后,采用“理論建模與動態(tài)試驗相結(jié)合”的方法來識別結(jié)合面的動力學(xué)參數(shù)。先根據(jù)懸臂梁結(jié)構(gòu)建立其動力學(xué)模型,然后利用DASP模態(tài)測試系統(tǒng)對試件進(jìn)行模態(tài)試驗,并進(jìn)行模態(tài)分析得到含有固定結(jié)合面懸臂梁結(jié)構(gòu)的固有頻率和阻尼比。最后通過系統(tǒng)的特征方程計算出結(jié)合面的剛度和阻尼系數(shù)并進(jìn)行優(yōu)化。 接著,分析了懸臂梁模型在不同結(jié)合條件下,其結(jié)合面剛度系數(shù)與阻尼系數(shù)的變化規(guī)律。用三種不同尺寸的懸臂梁試件在不同的預(yù)緊力作用下,分別識別出其結(jié)合面的剛度與阻尼系數(shù),并分析不同條件下對結(jié)合面特性參數(shù)的影響。最后,通過應(yīng)用ANSYS有限元分析軟件,分別在考慮結(jié)合面影響與不考慮結(jié)合面影響的兩種狀態(tài)下建立懸臂梁結(jié)構(gòu)的有限元模型,并進(jìn)行模態(tài)分析。以試驗?zāi)B(tài)分析為基準(zhǔn),通過振型相似比較其固有頻率的方法,充分證明了該識別方法是有效性。
[Abstract]:With the development of advanced manufacturing industry, the dynamic performance of mechanical equipment is required more and more. As an inherent structure of mechanical structure, the mechanical bonding surface is a kind of inherent structure. Taking machine tool as an example, it is shown that 60-80% of the total stiffness of the machine tool and 90% of the total damping are derived from the interface. Whether the correct dynamic parameters can be obtained is the key to the establishment of an accurate dynamic model of mechanical structure. Therefore, the dynamic modeling and parameter identification of the combined surface are always worthy of study. In this paper, the following studies are carried out: firstly, the current research work on mechanical bonding surface characteristics is systematically summarized, and a cantilever beam test model with fixed bonding surface is designed. Then, the dynamic parameters of the interface are identified by the method of "theoretical modeling and dynamic test". Firstly, the dynamic model of the cantilever beam structure is established, and then the modal test of the specimen is carried out by using the DASP modal test system. The natural frequencies and damping ratios of cantilever structures with fixed joints are obtained by modal analysis. Finally, the stiffness and damping coefficients of the joints are calculated and optimized by the characteristic equations of the system. Then, the variation law of stiffness coefficient and damping coefficient of cantilever beam model under different bonding conditions are analyzed. Three kinds of cantilever beam specimens with different sizes are used under different pretightening forces. The stiffness and damping coefficients of the bonding surface are identified respectively, and the effects of different conditions on the characteristic parameters of the bonding surface are analyzed. Finally, by using ANSYS finite element analysis software, The finite element model of cantilever beam structure is established under the condition of considering the influence of the bonding plane and the influence of the joint plane respectively, and the modal analysis is carried out. Based on the experimental modal analysis, the natural frequency of the cantilever beam structure is compared by the mode similarity. It is proved that the method is effective.
【學(xué)位授予單位】：寧夏大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TH113

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