【摘要】：隨著生活水平的提高,人們對機械產(chǎn)品的精度、速度、環(huán)保等要求也越來越高,這要求專業(yè)人員能夠基于市場的要求,運用模塊化設(shè)計、標準化設(shè)計、穩(wěn)健設(shè)計、可靠性設(shè)計、生命周期設(shè)計等現(xiàn)代設(shè)計方法,提出機械產(chǎn)品設(shè)計的應對方案。 機械設(shè)計已由過去的單純依賴經(jīng)驗設(shè)計演變?yōu)楝F(xiàn)在的依靠計算機技術(shù)、現(xiàn)代設(shè)計方法、規(guī)范及行業(yè)標準化的過程。傳統(tǒng)的經(jīng)驗設(shè)計嚴重依賴于設(shè)計者個人的經(jīng)驗和水平,導致生產(chǎn)資料的極大浪費。現(xiàn)代設(shè)計方法有較為成熟的理論依據(jù),并利用日益精確的計算功能及優(yōu)化設(shè)計工具等。本論文研究現(xiàn)代設(shè)計方法之一穩(wěn)健設(shè)計,主要研究內(nèi)容如下所示: 1)為了提高制造企業(yè)的市場競爭力,提出了一種穩(wěn)健優(yōu)化成本設(shè)計方法。鑒于社會對制造產(chǎn)業(yè)節(jié)約成本的要求越來越強烈。穩(wěn)健優(yōu)化成本設(shè)計可以讓企業(yè)通過采用更加廉價的零部件來替換目前設(shè)備上的零部件,并且產(chǎn)品的功能不會受到影響。在充分了解現(xiàn)有機械產(chǎn)品的基礎(chǔ)上,采用穩(wěn)健優(yōu)化成本設(shè)計的方法可以放松對零部件的精度要求。 線性問題是非線性問題的基礎(chǔ),論文首先回顧了線性工程模型的穩(wěn)健設(shè)計,并在其基礎(chǔ)上提出了一種優(yōu)化成本的設(shè)計方法,得出了輸入設(shè)備的方差關(guān)于設(shè)計參數(shù)及性能參數(shù)方差的函數(shù)關(guān)系,利用優(yōu)化的方法實現(xiàn)了設(shè)計參數(shù)的最優(yōu)組合,不但保證了產(chǎn)品質(zhì)量,而且降低了產(chǎn)品的生產(chǎn)成本。通過降低對輸入設(shè)備的精度要求實現(xiàn)了產(chǎn)品成本的優(yōu)化。 針對非線性工程模型,在保證產(chǎn)品性能不變甚至提高的前提下,基于泰勒展開,得出零部件公差關(guān)于設(shè)計參數(shù)及性能特征參數(shù)波動的確切關(guān)系,利用優(yōu)化工具MATLAB得出零部件更大的允許設(shè)計方差;然后根據(jù)方差求解出零部件的制造精度。在輕工機械產(chǎn)品中,涂布設(shè)備占有重要地位,利用穩(wěn)健優(yōu)化成本設(shè)計實現(xiàn)了涂布設(shè)備的節(jié)能目標。在涂布頭的設(shè)計中,基于其內(nèi)在機理以及穩(wěn)健優(yōu)化成本設(shè)計方法,放松了對各輥的制造精度及驅(qū)動精度的要求。 2)完善了分析性穩(wěn)健設(shè)計方法;具體針對隱函數(shù)工程模型的穩(wěn)健設(shè)計,提供了一個解決方案。依據(jù)功能特性參數(shù)與設(shè)計參數(shù)之間的隱函數(shù)關(guān)系,建立了產(chǎn)品性能波動方差與設(shè)計參數(shù)及其方差之間的函數(shù)關(guān)系,實現(xiàn)了隱函數(shù)工程模型的穩(wěn)健設(shè)計,使得產(chǎn)品質(zhì)量得以提升。在工程實踐中,工程模型存在隱函數(shù)形式的情況。利用泰勒展開的方法,并在功能需求個數(shù)與原始工程模型個數(shù)相等的情況下,求出了功能特性參數(shù)的方差及約束條件表達式,得出了基于隱函數(shù)工程模型的一種穩(wěn)健設(shè)計方法及模型。
[Abstract]:With the improvement of living standard, the requirements of precision, speed and environmental protection of mechanical products are becoming higher and higher, which requires professionals to be able to use modular design, standardized design, robust design and reliability design based on the requirements of the market. Life cycle design and other modern design methods, mechanical product design solutions. Mechanical design has changed from relying on experience in the past to relying on computer technology, modern design methods, standardization and industry standardization. The traditional empirical design relies heavily on the designer's personal experience and level, which leads to a great waste of the means of production. The modern design method has more mature theoretical basis, and makes use of the increasingly accurate calculation function and the optimization design tool and so on. In this paper, one of the modern design methods, robust design, is studied. The main contents are as follows: 1) in order to improve the market competitiveness of manufacturing enterprises, a robust optimization cost design method is proposed. In view of the society on the manufacturing industry cost-saving requirements are becoming more and more intense. Robust cost optimization allows companies to replace components on current equipment by adopting cheaper components without affecting the functionality of the product. On the basis of fully understanding the existing mechanical products, the method of robust optimization cost design can relax the precision requirements of components. Linear problem is the foundation of nonlinear problem. Firstly, the robust design of linear engineering model is reviewed, and a design method of optimal cost is proposed. The function relation of input equipment variance on design parameter and performance parameter variance is obtained. The optimal combination of design parameters is realized by using optimization method, which not only guarantees the product quality but also reduces the production cost. The product cost is optimized by reducing the precision requirement of the input equipment. In view of nonlinear engineering model, under the premise that the product performance is invariable or even improved, the exact relation of component tolerance on the fluctuation of design parameters and performance characteristic parameters is obtained based on Taylor expansion. The larger allowable design variance of the parts is obtained by using the optimization tool MATLAB. Then, according to the variance, the manufacturing accuracy of the parts is solved. Coating equipment plays an important role in light industrial machinery products. The energy saving target of coating equipment is realized by using robust optimization cost design. In the design of coating head, based on its internal mechanism and robust optimization cost design method, the requirements of manufacturing accuracy and driving precision of each roll are relaxed. 2) improving the analytical robust design method and providing a solution for the robust design of implicit function engineering model. According to the implicit function relation between the function characteristic parameter and the design parameter, the function relation between the product performance fluctuation variance and the design parameter and its variance is established, the robust design of the implicit function engineering model is realized, and the product quality is improved. In engineering practice, there are implicit function forms in engineering model. By using the Taylor expansion method and when the number of functional requirements is equal to the number of original engineering models, the expressions of variance and constraint conditions of the functional characteristic parameters are obtained. A robust design method and model based on implicit function engineering model are obtained.
【學位授予單位】：汕頭大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH122

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