穩(wěn)健優(yōu)化成本設計及隱函數穩(wěn)健設計研究
發(fā)布時間：2019-02-09 17:28
【摘要】：隨著生活水平的提高,人們對機械產品的精度、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,運用模塊化設計、標準化設計、穩(wěn)健設計、可靠性設計、生命周期設計等現代設計方法,提出機械產品設計的應對方案。 機械設計已由過去的單純依賴經驗設計演變?yōu)楝F在的依靠計算機技術、現代設計方法、規(guī)范及行業(yè)標準化的過程。傳統(tǒng)的經驗設計嚴重依賴于設計者個人的經驗和水平,導致生產資料的極大浪費�，F代設計方法有較為成熟的理論依據,并利用日益精確的計算功能及優(yōu)化設計工具等。本論文研究現代設計方法之一穩(wěn)健設計,主要研究內容如下所示: 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)化成本設計方法。鑒于社會對制造產業(yè)節(jié)約成本的要求越來越強烈。穩(wěn)健優(yōu)化成本設計可以讓企業(yè)通過采用更加廉價的零部件來替換目前設備上的零部件,并且產品的功能不會受到影響。在充分了解現有機械產品的基礎上,采用穩(wěn)健優(yōu)化成本設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,論文首先回顧了線性工程模型的穩(wěn)健設計,并在其基礎上提出了一種優(yōu)化成本的設計方法,得出了輸入設備的方差關于設計參數及性能參數方差的函數關系,利用優(yōu)化的方法實現了設計參數的最優(yōu)組合,不但保證了產品質量,而且降低了產品的生產成本。通過降低對輸入設備的精度要求實現了產品成本的優(yōu)化。 針對非線性工程模型,在保證產品性能不變甚至提高的前提下,基于泰勒展開,得出零部件公差關于設計參數及性能特征參數波動的確切關系,利用優(yōu)化工具MATLAB得出零部件更大的允許設計方差;然后根據方差求解出零部件的制造精度。在輕工機械產品中,涂布設備占有重要地位,利用穩(wěn)健優(yōu)化成本設計實現了涂布設備的節(jié)能目標。在涂布頭的設計中,基于其內在機理以及穩(wěn)健優(yōu)化成本設計方法,放松了對各輥的制造精度及驅動精度的要求。 2)完善了分析性穩(wěn)健設計方法;具體針對隱函數工程模型的穩(wěn)健設計,提供了一個解決方案。依據功能特性參數與設計參數之間的隱函數關系,建立了產品性能波動方差與設計參數及其方差之間的函數關系,實現了隱函數工程模型的穩(wěn)健設計,使得產品質量得以提升。在工程實踐中,工程模型存在隱函數形式的情況。利用泰勒展開的方法,并在功能需求個數與原始工程模型個數相等的情況下,求出了功能特性參數的方差及約束條件表達式,得出了基于隱函數工程模型的一種穩(wěn)健設計方法及模型。
[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
本文編號：2419211
[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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