被动隔热式折流板结构设计研究

发布时间：2018-02-10 00:30

本文关键词： 折流板结构优化拓扑优化运动机构　出处：《中国舰船研究院》2015年硕士论文　论文类型：学位论文

【摘要】：在新型发动机研发的过程中,折流板装置可以保证发动机尾喷试验的安全进行。随着发动机类型的多样化,现有装置已无法满足试验过程中的使用要求,因此有必要对新型折流板装置进行研究。本文针对现有装置的不足,提出两种新型折流板装置的总体方案,并对其进行结构优化研究。有限元分析及结构优化技术逐渐成为现代结构设计的重要手段,其中拓扑优化技术更是当前结构优化研究的重点与热点。文章在对结构拓扑优化基本原理进行研究的基础上,探讨不同数值算法在拓扑优化中的计算效率。并对优化过程中的数值不稳定现象产生原因与解决方法进行研究,通过算例对比不同过滤方法对拓扑优化结果的影响。在对不同数值算法及过滤方法的研究基础上,文章对折流板装置中运动质量最大的车辆通过面进行结构优化。首先对其进行拓扑优化,并根据拓扑优化结果设计车辆通过面的具体结构形式。接下来对其进行尺寸优化,在满足使用要求的前提下,两新型方案车辆通过面较优化前质量分别下降29.4%及26.6%。对机构优化设计的方法进行研究,在此基础上建立折流板运动执行机构运动学及动力学分析的数学模型、优化目标及评判准则,并选取合适的优化算法,对新型装置的运动执行机构进行优化。首先分析机构连杆质量及长度对最大驱动力的影响,在此基础之上确定优化变量,进而对运动执行机构进行优化。接下来对两新型装置的直接驱动方案进行优化,最后从运动学及动力学两方面对各驱动方案进行对比分析。
[Abstract]:In the research and development of new engine, the baffle device can ensure the safety of engine tail injection test. With the diversification of engine types, the existing equipment can no longer meet the requirements of the test. Therefore, it is necessary to study the new baffle device. In view of the deficiency of the existing device, this paper puts forward two general schemes of the new type baffle plate device. Finite element analysis and structural optimization technology have gradually become an important means of modern structural design. Among them, the topology optimization technology is the focus and hot spot of the current structural optimization research. In this paper, the basic principle of structural topology optimization is studied. This paper discusses the computational efficiency of different numerical algorithms in topology optimization, and studies the causes and solutions of numerical instability in the optimization process. The effects of different filtering methods on topology optimization results are compared by an example. Based on the study of different numerical algorithms and filtering methods, This paper optimizes the structure of the most moving vehicle passing surface in the baffle. Firstly, it is topology optimized, and according to the result of topological optimization, the specific structure form of the vehicle passing surface is designed, and then the size optimization is carried out. On the premise of satisfying the requirements of use, the mass of the two new scheme vehicles is reduced by 29.4% and 26.6before compared with the ones before the optimization. The method of the optimum design of the mechanism is studied. On this basis, the mathematical model of kinematics and dynamics analysis of baffle motion actuator is established, the optimization target and criterion are optimized, and the appropriate optimization algorithm is selected. First, the influence of the mass and length of the linkage on the maximum driving force is analyzed, and then the optimization variables are determined. Then the motion actuators are optimized. Then the direct drive schemes of the two new devices are optimized. Finally, the kinematics and dynamics of the drive schemes are compared and analyzed.
【学位授予单位】：中国舰船研究院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK407

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