本文選題：過渡環(huán)　切入點：三心底　出處：《大連理工大學》2015年碩士論文　論文類型：學位論文

【摘要】：我國目前正在研制新一代運載火箭貯箱結(jié)構(gòu),未來還將研制重型運載火箭貯箱結(jié)構(gòu)。隨著結(jié)構(gòu)尺度不斷增加,結(jié)構(gòu)尺寸效應更加明顯,輕量化要求更高,傳統(tǒng)的設計思路和方法已不能滿足要求,在結(jié)構(gòu)設計中需要更精細化的設計思路和量化控制手段。本文對大直徑貯箱典型結(jié)構(gòu)開展力學性能分析與優(yōu)化設計,具體內(nèi)容如下：1.針對某大直徑貯箱Y形過渡環(huán)進行強度分析與精細優(yōu)化設計。首先探討過渡環(huán)與筒段焊縫連接處內(nèi)外側(cè)應力差過大的原因,然后研究Y形環(huán)和筒段形貌對焊縫及熱影響區(qū)應力分布的影響規(guī)律。最后基于參數(shù)優(yōu)化和形狀優(yōu)化的協(xié)同優(yōu)化策略,利用ISIGHT多學科優(yōu)化軟件集成有限元分析軟件ABAQUS搭建優(yōu)化平臺,基于該平臺的最終優(yōu)化結(jié)果可以有效地改善Y形環(huán)和筒段焊縫連接處的應力水平,提高貯箱的承載能力。2.針對大直徑貯箱三心底的應力狀態(tài)和內(nèi)壓穩(wěn)定性進行研究。首先通過理論分析、有限元計算和試驗測試探討三心底的應力變化規(guī)律,并驗證邊緣應力是過渡區(qū)應力波動的主要原因。根據(jù)邊緣應力的性質(zhì)和特點,提出有效抑制邊緣應力的具體措施。最后基于有限元分析軟件ABAQUS,對受內(nèi)壓三心底進行彈、塑性屈曲分析,討論屈曲行為對幾何參數(shù)的敏感性,結(jié)果顯示屈曲載荷和屈曲形態(tài)對幾何參數(shù)比較敏感。3.針對大直徑貯箱橢球底模數(shù)和內(nèi)壓穩(wěn)定性進行研究。首先從理論上分析模數(shù)對橢球底應力、貯箱承載能力、箭體長度、貯箱重量及箱底與短殼間空間的影響規(guī)律。然后探討筒段邊界對橢球底屈曲載荷和臨界屈曲模數(shù)的影響,結(jié)果顯示筒段邊界對橢球底內(nèi)壓屈曲行為存在抑制作用,筒段邊界的存在導致箱底臨界屈曲載荷較理論值偏大。最后研究典型橢球底結(jié)構(gòu)對不同類型缺陷的敏感性規(guī)律,研究結(jié)果可為大直徑貯箱橢球底內(nèi)壓屈曲折減因子的選取提供參考。4.針對大直徑環(huán)形液氧貯箱進行力學性能分析與精細優(yōu)化設計。對環(huán)形貯箱開展考慮穩(wěn)定性約束的輕量化設計,基于拓撲優(yōu)化技術(shù)獲得內(nèi)隔板最優(yōu)傳力路徑,最終獲得工程上可用的設計方案。
[Abstract]:At present, China is developing a new generation of carrier rocket tank structure, and will also develop a heavy launch vehicle tank structure in the future. With the increasing of structure scale, the size effect of structure is more obvious, and the requirement of lightweight is higher. The traditional design ideas and methods can not meet the requirements, and more detailed design ideas and quantitative control methods are needed in the structural design. In this paper, the mechanical performance analysis and optimization design of typical large diameter tank structures are carried out. The concrete contents are as follows: 1. The strength analysis and fine optimization design of the Y-shaped transition ring of a large diameter tank are carried out. Firstly, the reason for the excessive stress difference between the inner and outer side of the weld joint between the transition ring and the tube section is discussed. Then the influence of Y ring and tube shape on the stress distribution of weld and heat affected zone is studied. Finally, based on the cooperative optimization strategy of parameter optimization and shape optimization, The optimization platform is built by integrating the finite element analysis software ABAQUS with ISIGHT multidisciplinary optimization software. The final optimization results based on the platform can effectively improve the stress level at the joint of Y-ring and tube weld. The stress state and internal pressure stability of the three bottom of the large diameter tank are studied. Firstly, through theoretical analysis, finite element calculation and test test, the stress variation law of the three bottom is discussed. It is verified that the edge stress is the main reason for the stress fluctuation in the transition zone. According to the properties and characteristics of the edge stress, the concrete measures to effectively suppress the edge stress are put forward. Plastic buckling analysis is used to discuss the sensitivity of buckling behavior to geometric parameters. The results show that buckling load and buckling form are sensitive to geometric parameters. 3. The stability of modulus and internal pressure of ellipsoid of large diameter tank is studied. Firstly, the stress of modulus to ellipsoid, the carrying capacity of tank and the length of arrow are analyzed theoretically. The influence of the container weight and the space between the bottom of the container and the short shell on the buckling load and the critical buckling modulus of the ellipsoid is discussed. The results show that the boundary of the cylinder has an inhibitory effect on the buckling behavior of the ellipsoid bottom. The critical buckling load on the bottom of the box is larger than the theoretical value due to the existence of the boundary of the tube. Finally, the sensitivity of typical ellipsoidal structures to different types of defects is studied. The results can provide a reference for the selection of buckling factor in the ellipsoidal bottom of the large diameter tank. 4. The mechanical performance analysis and fine optimization design of the large diameter liquid oxygen tank are carried out. The stability of the ring tank is considered. Beam lightweight design, Based on the topology optimization technique, the optimal load transfer path of the inner diaphragm is obtained, and the design scheme available in engineering is obtained.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：V421;V475.1

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