發(fā)布時(shí)間：2018-06-05 05:10

  本文選題：橋式起重機(jī)主梁 + 穩(wěn)健優(yōu)化��； 參考：《太原科技大學(xué)》2017年碩士論文

【摘要】：隨著橋式起重機(jī)在工廠、倉(cāng)庫(kù)等物料搬運(yùn)中的普遍使用,起重機(jī)結(jié)構(gòu)的可靠性和安全性越來越受到使用者的關(guān)注。起重機(jī)主梁作為金屬橋架結(jié)構(gòu)的重要組成部分,在起重機(jī)工作過程中起著支撐其他設(shè)備和傳遞載荷的作用,所以,起重機(jī)主梁的穩(wěn)健性很大程度上影響著起重機(jī)整機(jī)系統(tǒng)的穩(wěn)健性。目前,對(duì)起重機(jī)主梁的設(shè)計(jì)研究已經(jīng)取得了大量的成果,但是,其設(shè)計(jì)仍然處于半理論半經(jīng)驗(yàn)設(shè)計(jì)階段,并且設(shè)計(jì)參數(shù)均按確定性參數(shù)考慮,然而實(shí)際結(jié)構(gòu)設(shè)計(jì)中,結(jié)構(gòu)的任何設(shè)計(jì)參數(shù)都不可能是確定的,并且生產(chǎn)環(huán)境、使用過程中都存在不確定性因素的影響,從而造成安全隱患,這些因素是固有的,其影響不可能通過人為的方法消除或者避免。因此,對(duì)起重機(jī)主梁進(jìn)行穩(wěn)健性設(shè)計(jì)有著重要的工程價(jià)值和現(xiàn)實(shí)意義。本文以傳統(tǒng)力學(xué)理論的設(shè)計(jì)公式為基礎(chǔ),對(duì)橋式起重機(jī)主梁結(jié)構(gòu)進(jìn)行分析研究,提出了基于靈敏度分析的起重機(jī)主梁結(jié)構(gòu)穩(wěn)健優(yōu)化設(shè)計(jì)方法。首先,對(duì)起重機(jī)主梁的相關(guān)參數(shù)進(jìn)行敏感性分析確定需要考慮的不確定參數(shù),以這些參數(shù)作為下一步進(jìn)行穩(wěn)健設(shè)計(jì)的設(shè)計(jì)參數(shù)。其次,將對(duì)設(shè)計(jì)參數(shù)的不確定性的敏感性較大的質(zhì)量指標(biāo)作為進(jìn)行穩(wěn)健優(yōu)化的目標(biāo),基于靈敏度估算法分析出主要質(zhì)量指標(biāo)的敏感性函數(shù),建立基于靈敏度分析的穩(wěn)健設(shè)計(jì)模型。最后,將該模型與傳統(tǒng)的確定性結(jié)構(gòu)優(yōu)化設(shè)計(jì)模型進(jìn)行結(jié)合,構(gòu)建了既可以實(shí)現(xiàn)穩(wěn)健性設(shè)計(jì)又可以實(shí)現(xiàn)減量化設(shè)計(jì)的多目標(biāo)穩(wěn)健優(yōu)化設(shè)計(jì)模型,兼顧結(jié)構(gòu)的穩(wěn)健性設(shè)計(jì)和減量化設(shè)計(jì),滿足現(xiàn)代設(shè)計(jì)的低成本、高安全性的要求,利用Matlab優(yōu)化工具箱,基于灰色絕對(duì)關(guān)聯(lián)度理論求解它的最優(yōu)設(shè)計(jì)解,求解方法避免了傳統(tǒng)利用加權(quán)法和有效解法造成的結(jié)果的不合理性。穩(wěn)健優(yōu)化結(jié)果表明:起重機(jī)主梁的截面面積比確定性優(yōu)化設(shè)計(jì)的起重機(jī)主梁截面面積有所提高,即整個(gè)結(jié)構(gòu)的重量有所增加,但是結(jié)構(gòu)的各性能指標(biāo)對(duì)各設(shè)計(jì)參數(shù)的敏感性均有所降低,增加的重量用來抵抗結(jié)構(gòu)的穩(wěn)健性。
[Abstract]:With the widespread use of bridge cranes in the material handling such as factories and warehouses, the reliability and safety of the crane structure are becoming more and more concerned by the users. As an important part of the metal bridge structure, the crane girder plays a role in supporting his equipment and transfer load during the working process of the crane, so the crane is a crane. The robustness of the main girder greatly affects the robustness of the crane whole system. At present, a lot of achievements have been made in the study of the design of the crane girder. However, the design is still in the semi theoretical and semi empirical design stage, and the design parameters are considered in accordance with the deterministic parameters. However, in the actual structural design, any set of structures is set. The parameters can not be determined, and in the production environment, there are uncertain factors in the process of use, which can cause the hidden danger. These factors are inherent, and their influence can not be eliminated or avoided by human methods. Therefore, it has important engineering value and practical meaning to the robustness design of the crane's main Liang Jin line. Based on the design formula of traditional mechanics theory, this paper analyzes the main beam structure of the bridge crane and proposes a robust optimization design method for the crane girder structure based on sensitivity analysis. First, the sensitivity analysis of the related parameters of the crane girder is determined to determine the uncertain parameters which need to be considered, and these parameters are taken into account. As a design parameter for the robust design of the next step, the sensitive quality index of the uncertainty of the design parameters is taken as the target of robust optimization, and the sensitivity function of the main quality index is analyzed based on the sensitivity estimation method, and the robust design model based on the sensitivity analysis is established. Finally, the model and the model are used. The traditional deterministic structural optimization design model is combined to build a multi-objective robust optimization design model, which can realize both robustness design and reduction design. It takes into account the robustness design and reduction design of the structure to meet the low cost of modern design and the requirement of high safety. Based on the Matlab optimization toolbox, it is based on the optimization toolbox. The grey absolute correlation degree theory is used to solve the optimal design solution. The solution method avoids the unreasonable results caused by the traditional weighting method and effective solution. The robust optimization results show that the cross section area of the crane main beam is higher than that of the deterministic optimization design, that is, the weight of the whole structure is increased. In addition, the sensitivity of the structural performance indexes to each design parameter is reduced, and the added weight is used to resist the robustness of the structure.
【學(xué)位授予單位】：太原科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH215

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本文編號(hào)：1980688