發(fā)布時(shí)間：2018-10-22 07:06

【摘要】：振動(dòng)機(jī)械的應(yīng)用十分廣泛,反共振振動(dòng)機(jī)械比傳統(tǒng)的振動(dòng)機(jī)械有更好的工作性能。雖然反共振振動(dòng)理論得到了很多的研究,但是用于生產(chǎn)實(shí)踐的反共振振動(dòng)機(jī)械還不成熟。反共振振動(dòng)機(jī)械是一類新型的振動(dòng)機(jī)械,它以反共振原理為基礎(chǔ),當(dāng)工作在反共振點(diǎn)時(shí),其對應(yīng)的隔振系統(tǒng)振幅將為極小值,而工作機(jī)體卻可正常工作。反共振振動(dòng)機(jī)械具有比傳統(tǒng)的振動(dòng)機(jī)械更大的優(yōu)越性,現(xiàn)已成為人們研究的熱點(diǎn)。本文以反共振振動(dòng)篩為研究對象,針對設(shè)計(jì)制造過程中的幾個(gè)關(guān)鍵技術(shù)進(jìn)行了仿真研究,并對某些結(jié)構(gòu)作了改進(jìn)。 首先,設(shè)計(jì)了兩種振動(dòng)篩結(jié)構(gòu),通過有限元靜力學(xué)分析確定了哪種結(jié)構(gòu)能更好的滿足制造工藝及使用要求,檢驗(yàn)結(jié)構(gòu)設(shè)計(jì)的合理性,對不合理的結(jié)構(gòu)進(jìn)行改進(jìn)。之后利用有限元方法對振動(dòng)篩進(jìn)行動(dòng)力學(xué)分析。包括利用諧響應(yīng)分析預(yù)測反共振點(diǎn)的位置；之后在反共振頻率下,進(jìn)行簡諧力作用下的振動(dòng)篩的瞬態(tài)分析,觀察反共振現(xiàn)象及動(dòng)態(tài)應(yīng)力。 由于傳統(tǒng)的靜力學(xué)分析方法存在一定的不足,因此實(shí)驗(yàn)了兩種新的靜力學(xué)分析的方法,并比較了三種方法的計(jì)算結(jié)果。整體分析時(shí)對板彈簧座結(jié)構(gòu)作了簡化,因此計(jì)算獲得的板彈簧應(yīng)力不準(zhǔn)確,為獲得板彈簧座的準(zhǔn)確應(yīng)力情況,單獨(dú)對板彈簧組件進(jìn)行了分析。之后根據(jù)分析結(jié)果對結(jié)構(gòu)進(jìn)行了疲勞壽命計(jì)算。 最后,研究了一種金屬橡膠復(fù)合板彈簧,對其動(dòng)剛度、靜剛度、應(yīng)力的變化情況進(jìn)行了分析計(jì)算。計(jì)算結(jié)果表明,復(fù)合彈簧的剛度有較大增加,剛度隨著橡膠材料的硬度增大而增大,且在工作情況下剛度仍呈線性關(guān)系。因此,在滿足剛度、應(yīng)力要求的情況下應(yīng)用復(fù)合彈簧可以減小彈簧的厚度,有利于結(jié)構(gòu)的緊湊。
[Abstract]:Vibration machinery is widely used, and antiresonance vibration machinery has better performance than traditional vibration machinery. Although antiresonance vibration theory has been studied a lot, antiresonance vibration machinery used in production practice is still immature. Antiresonance vibration machinery is a new type of vibration machinery, which is based on the antiresonance principle. When working at the antiresonance point, the amplitude of the corresponding isolation system will be minimized, while the working block can work normally. Antiresonance vibration machine has more advantages than traditional vibration machinery, and has become a hot research topic. In this paper, the antiresonance vibrating screen is taken as the research object, and some key technologies in the process of design and manufacture are simulated and studied, and some structures are improved. Firstly, two kinds of vibrating screen structures are designed. Through finite element statics analysis, we determine which structure can better meet the requirements of manufacturing process and use, check the rationality of structural design, and improve the unreasonable structure. Then the finite element method is used to analyze the dynamics of the vibrating screen. The harmonic response analysis is used to predict the position of the antiresonance point and the transient analysis of the vibrating screen under the simple harmonic force is carried out at the antiresonance frequency to observe the antiresonance phenomenon and the dynamic stress. Because the traditional statics analysis method has some shortcomings, two new statics analysis methods are experimented, and the results of the three methods are compared. The structure of the plate spring pedestal is simplified during the whole analysis, so the plate spring stress obtained by calculation is not accurate. In order to obtain the accurate stress of the plate spring seat, the plate spring assembly is analyzed separately. Then the fatigue life of the structure is calculated according to the analysis results. Finally, the dynamic stiffness, static stiffness and stress of a metal rubber composite plate spring are analyzed and calculated. The results show that the stiffness of the composite spring increases greatly, and the stiffness increases with the increase of the hardness of the rubber material, and the stiffness of the composite spring is still linearly related to the working conditions. Therefore, when the stiffness and stress are satisfied, the thickness of the spring can be reduced by using the composite spring, which is advantageous to the compactness of the structure.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH237.6

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