本文選題：再制造葉輪 + 服役壽命��； 參考：《重慶大學(xué)》2013年博士論文

【摘要】：機(jī)械裝備再制造是再制造產(chǎn)業(yè)發(fā)展和循環(huán)經(jīng)濟(jì)建設(shè)的重點(diǎn)技術(shù)領(lǐng)域，為此，國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃（973計(jì)劃）專(zhuān)門(mén)設(shè)立了“機(jī)械裝備再制造的基礎(chǔ)科學(xué)問(wèn)題”項(xiàng)目（2011CB013400），以離心式壓縮機(jī)為典型對(duì)象，開(kāi)展機(jī)械裝備再制造的若干基礎(chǔ)科學(xué)問(wèn)題研究，為再制造技術(shù)攻關(guān)提供理論依據(jù)。其中再制造零件壽命預(yù)測(cè)涉及多個(gè)學(xué)科領(lǐng)域，已成為機(jī)械零件再制造的技術(shù)關(guān)鍵之一，迫切需要相關(guān)理論和方法的支持。本研究在973項(xiàng)目研究課題之一“再制造零部件的壽命預(yù)測(cè)與再制造產(chǎn)品服役安全驗(yàn)證”（2011CB013400-5）的資助下，開(kāi)展了離心式壓縮機(jī)再制造葉輪服役壽命預(yù)測(cè)模型及數(shù)值仿真研究，為再制造葉輪服役機(jī)理分析、服役安全性能評(píng)價(jià)提供理論和方法支持。 首先，在斷裂力學(xué)和損傷累積理論的基礎(chǔ)上，結(jié)合再制造葉輪工藝修復(fù)結(jié)構(gòu)特征和服役特征載荷，提出一種再制造葉輪零部件服役壽命預(yù)測(cè)模型。將材料或試件現(xiàn)有的壽命預(yù)測(cè)方法拓展到再制造后的離心壓縮機(jī)葉輪上，建立起包含面向多失效特征的再制造葉輪幾何精確建模方法、基于計(jì)算域虛擬規(guī)劃的再制造葉輪流道自適應(yīng)網(wǎng)格劃分方法、基于數(shù)值分析的再制造葉輪服役特征載荷求解方法和FE-SAFE壽命計(jì)算軟件以及再制造工藝壽命修正試驗(yàn)的再制造葉輪服役壽命預(yù)測(cè)模型，為再制造葉輪服役安全性能判定提供一種理論方法。 其次，針對(duì)再制造葉輪模型缺失或已有模型無(wú)法反應(yīng)再制造特征的問(wèn)題，提出了面向多失效特征的再制造葉輪幾何特征精確建模方法，構(gòu)建體現(xiàn)再制造工藝特征的再制造葉輪精確幾何模型；在有限元誤差估算理論、幾何拓?fù)渫髟淼幕A(chǔ)上，建立再制造葉輪幾何關(guān)鍵區(qū)域識(shí)別準(zhǔn)則和計(jì)算域虛擬規(guī)劃算法，形成再制造葉輪零件的全六面體網(wǎng)格生成方法，對(duì)再制造葉輪精確幾何模型進(jìn)行網(wǎng)格劃分，產(chǎn)生疏密有致的高精度再制造葉輪流道自適應(yīng)有限元網(wǎng)格模型。 然后，在有限元傳熱理論、彈塑性力學(xué)、微積分原理基礎(chǔ)上，利用ANSYS仿真技術(shù)分析并討論了再制造葉輪服役的四種典型特征載荷，包括再制造工藝誘發(fā)的殘余應(yīng)力載荷、裝配產(chǎn)生的裝配應(yīng)力載荷、高速離心應(yīng)力載荷和氣體介質(zhì)等效應(yīng)力載荷�；诜治雠c模擬結(jié)果綜合評(píng)判再制造葉輪的服役靜態(tài)強(qiáng)度，，并為再制造葉輪服役壽命預(yù)測(cè)的載荷譜擬合提供幅值依據(jù)。 最后，開(kāi)展某型號(hào)大型離心壓縮機(jī)再制造開(kāi)式葉輪壽命預(yù)測(cè)的應(yīng)用研究。根據(jù)再制造葉輪服役的五個(gè)階段特性和四種典型特征載荷建立再制造葉輪服役的載荷譜曲線，利用再制造葉輪服役壽命預(yù)測(cè)模型對(duì)再制造葉輪服役壽命進(jìn)行預(yù)測(cè)，并通過(guò)基體材料FV520B的激光熔覆試驗(yàn)所得壽命修正系數(shù)算出了再制造葉輪的可服役年限。同時(shí)，也討論了再制造工藝載荷對(duì)葉輪服役壽命的影響。
[Abstract]:Remanufacturing of machinery and equipment is a key technical field in the development of remanufacturing industry and the construction of circular economy. For this reason,The National key basic Research and Development Program (the "basic Scientific problems in Mechanical equipment Remanufacturing") has been set up to carry out a number of basic scientific research on mechanical equipment remanufacturing, taking centrifugal compressors as the typical object.To provide theoretical basis for re-manufacturing technology research.Among them, the life prediction of remanufacturing parts involves many disciplines, and has become one of the key technologies in the remanufacturing of mechanical parts, which urgently needs the support of relevant theories and methods.In this study, the life prediction model and numerical simulation study of centrifugal compressor remanufacturing impeller were carried out with the aid of "Life Prediction of remanufactured parts and Service Safety Verification of Remanufacturing products" (2011CB013400-5), one of the research topics of 973 project.It provides theoretical and methodological support for service mechanism analysis and service safety performance evaluation of remanufacturing impellers.Firstly, based on the fracture mechanics and damage accumulation theory, a service life prediction model for remanufacturing impeller parts is proposed, which combines the structural characteristics and service characteristic loads of the remanufacturing impeller process.The existing life prediction method of material or specimen is extended to the impeller of centrifugal compressor after remanufacture, and a geometric accurate modeling method for remanufacturing impeller is established, which contains multi-failure characteristics.Adaptive mesh generation method for remanufacturing impeller runner based on computational domain virtual programming.Based on numerical analysis, the service life prediction model of remanufacturing impeller is presented, which is based on the calculation method of service characteristic load of remanufacturing impeller and FE-SAFE life calculation software, as well as the service life prediction model of remanufacturing impeller based on remanufacturing process life correction test.It provides a theoretical method for determining the service safety performance of remanufacturing impeller.Secondly, aiming at the problem that the model of remanufacturing impeller is missing or the existing model can not reflect the characteristics of remanufacturing, an accurate modeling method for geometric features of remanufacturing impeller is proposed, which is oriented to multiple failure features.Based on the finite element error estimation theory and the principle of geometric topology of the same billet, the key region recognition criteria and the virtual programming algorithm of the computational domain for the remanufacturing impeller are established.An all-hexahedron mesh generation method is formed for remanufacturing impeller parts. The precise geometric model of the remanufacturing impeller is meshed to generate a highly precise self-adaptive finite element mesh model for remanufacturing impeller runner.Then, on the basis of finite element heat transfer theory, elastoplastic mechanics and calculus principle, four typical characteristic loads of remanufacturing impeller are analyzed and discussed by using ANSYS simulation technology, including residual stress load induced by remanufacturing process.Assembly stress load produced by assembly, high speed centrifugal stress load and gas medium equivalent stress load.Based on the analysis and simulation results, the static strength of the remanufactured impeller is evaluated, and the amplitude of the load spectrum fitting for the service life prediction of the remanufacturing impeller is provided.Finally, the life prediction of open impeller for a large centrifugal compressor is studied.According to the five stage characteristics of remanufacturing impeller and four typical characteristic loads, the load spectrum curve of remanufacturing impeller service is established, and the service life prediction model of remanufactured impeller is used to predict the service life of remanufacturing impeller.The service life of the remanufactured impeller is calculated by the life correction coefficient obtained from the laser cladding test of the FV520B substrate material.At the same time, the influence of remanufacturing process load on the service life of impeller is also discussed.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TH452

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