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基于平面運動鏈的類型綜合及創(chuàng)新設(shè)計方法的研究

發(fā)布時間:2018-10-17 13:42
【摘要】:機構(gòu)學(xué)研究的核心是進(jìn)行機構(gòu)創(chuàng)新設(shè)計。機構(gòu)創(chuàng)新設(shè)計的實質(zhì)是通過不同的類型綜合和同構(gòu)判別方法,產(chǎn)生不同的運動鏈,然后依托某種創(chuàng)新設(shè)計方法,構(gòu)造出不同的具有優(yōu)良品質(zhì)和獨特性能的結(jié)構(gòu)類型。近年來,在運動鏈類型綜合、同構(gòu)判別以及創(chuàng)新設(shè)計方法上,已經(jīng)取得了較大的成果。然而大多數(shù)方法的繁瑣性、低效性和不實用等局限制約了機構(gòu)創(chuàng)新設(shè)計的發(fā)展,因此,尋求簡單、高效和實用的類型綜合、同構(gòu)判別和創(chuàng)新設(shè)計方法,成為了機構(gòu)學(xué)研究的熱點和難點。 本文以平面多桿機構(gòu)為研究對象,在平面運動鏈的類型綜合、同構(gòu)判別和機構(gòu)創(chuàng)新設(shè)計的方法上開展了研究。主要研究內(nèi)容和結(jié)果如下: 歸納了眾多平面運動鏈類型綜合的一般步驟,在此基礎(chǔ)上,通過將胚圖支鏈法、胚圖插點法和運動鏈基本鏈型構(gòu)造法有機的組合(稱為系統(tǒng)化類型綜合),完整的綜合出了8桿以下-1到7自由度的所有單鉸運動鏈型,并對含復(fù)鉸的運動鏈類型綜合進(jìn)行了演化創(chuàng)新。 通過若干同構(gòu)運動鏈的實例,對基于特征數(shù)組的同構(gòu)判別方法進(jìn)行了詳細(xì)闡述和創(chuàng)新,使其不僅滿足單鉸運動鏈的同構(gòu)判別,,還適用于復(fù)鉸運動鏈的同構(gòu)判別,并編制了基于特征數(shù)組的同構(gòu)運動鏈判別軟件,實現(xiàn)了該方法的計算機化。 利用機構(gòu)創(chuàng)新設(shè)計中的機構(gòu)再生運動鏈理論,對一種可變性沙發(fā)床機構(gòu),進(jìn)行了創(chuàng)新設(shè)計,在此基礎(chǔ)上,指出了該方法的一些局限性,加入了桿件重組、增減桿、拓?fù)涮匦栽u價和同性異形演化等步驟進(jìn)行了補充和簡化,從而豐富了再生運動鏈理論,使其更簡單完善,最后應(yīng)用一種玻璃模具的開合機構(gòu),對完善后的創(chuàng)新設(shè)計方法進(jìn)行了實例的驗證。 通過對劍桿織機共軛凸輪引緯機構(gòu)的分析,應(yīng)用上述的機構(gòu)創(chuàng)新設(shè)計方法進(jìn)行了創(chuàng)新設(shè)計,提出了幾套可行的方案,并對其中一個方案進(jìn)行了運動學(xué)分析、建模和仿真,證實了該方法進(jìn)行創(chuàng)新設(shè)計具有簡單、高效的優(yōu)勢。
[Abstract]:The core of mechanism research is the innovative design of mechanism. The essence of mechanism innovation design is to produce different kinematic chains through different types synthesis and isomorphism discrimination methods, and then to construct different structural types with excellent quality and unique performance depending on some innovative design method. In recent years, great achievements have been made in kinematic chain type synthesis, isomorphism discrimination and innovative design methods. However, the limitations of most methods, such as triviality, inefficiency and impracticality, restrict the development of mechanism innovation design. Therefore, we seek a simple, efficient and practical method for type synthesis, isomorphism discrimination and innovative design. It has become a hot and difficult point in mechanism research. In this paper, the method of type synthesis, isomorphism discrimination and innovative design of planar kinematic chain is studied. The main contents and results are as follows: the general steps of synthesis of many planar kinematic chains are summarized. An organic combination of the embryo map insertion method and the basic chain construction method of the kinematic chain (known as systematic type synthesis), the complete synthesis of all single-hinged kinematic chains with degrees of freedom from-1 to 7 degrees of freedom below 8 rods, The evolutionary innovation of the type synthesis of motion chain with complex hinges is also carried out. Through some examples of isomorphic kinematic chain, the method of isomorphism discrimination based on feature array is expounded and innovated in detail, which not only satisfies the isomorphism discrimination of single hinge kinematic chain, but also applies to the isomorphism discrimination of complex hinge kinematic chain. A discriminant software of isomorphic kinematic chain based on feature array is developed, and the computerization of this method is realized. Based on the theory of mechanism regenerative kinematic chain in mechanism innovation design, an innovative design of a kind of variable sofa bed mechanism is carried out. On the basis of this, some limitations of this method are pointed out, and the bar recombination is added, and the bar is added and decreased. The evaluation of topological characteristics and the evolution of homotropic shapes are supplemented and simplified, which enriches the theory of regenerative motion chain and makes it more simple and perfect. Finally, a kind of opening and closing mechanism of glass mould is used. The improved innovative design method is verified by an example. Based on the analysis of conjugate cam weft insertion mechanism of rapier loom, the innovative design method mentioned above is applied, and several feasible schemes are put forward, one of which is kinematically analyzed, modeled and simulated. It is proved that this method has the advantages of simplicity and high efficiency.
【學(xué)位授予單位】:浙江理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2012
【分類號】:TH112

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