民航发动机单元体性能参数分析及性能评估

发布时间：2018-03-27 23:36

本文选题：发动机健康管理　切入点：单元体　出处：《中国民航大学》2015年硕士论文

【摘要】：随着民航领域发动机单元体设计概念的提出和实施,重点评估发动机总体性能、整机性能排队和以发动机排气温度裕度报告的性能评估系统缺陷逐渐凸显,而单元体结构化设计的发动机需要从单元体层面对发动机进行性能评估,以全面提升发动机的经济发挥性。因此,迫切需要建立面向单元体性能评估的体制。评估发动机单元体性能,合理选择表征单元体性能的参数是关键,但国内目前面向单元体性能评估所选用的参数都是基于整机性能的参数。因此从发动机工作原理出发,研究表征单元体的性能参数为发动机性能评估由整机评估深入到发动机单元体评估提供了可能。课题主要研究内容为:(1)单元体的性能参数选择:针对传统的评估都是借助一定的算法,直接使用可测参数进行整机性能评估的发动机健康管理体制,提出了依据发动机工作原理对核心单元体性能参数进行分析,再结合可测参数,研究面向单元体的现代发动机性能评估体制;(2)单元体性能参数选择有效性验证:研究发动机整机性能参数与核心单元体性能参数之间的关系,以BP神经网络构建核心单元体可测参数与Cycles、DEGT性能参数间的非线性网络,验证可测参数的有效性。同时结合常见的单元体故障机理,分析其性能衰退时所引起的参数变化,进一步验证所选表征单元体性能参数的合理有效性;(3)面向单元体的性能评估:主要以PW4077D发动机核心单元体为例,采用主成分分析法(Principal Components Analysis,PCA)和TOPSIS信息熵两种算法,给出PW4077D发动机核心单元体的性能健康指数计算公式,最后采用某公司PW4077D发动机在巡航状态下的数据评估核心单元体的性能。课题研究成果对推动国内面向发动机单元体性能评估的研究有重要意义。一方面,主要从发动机单元体工作原理出发,研究影响其性能的参数;另一方面为了与结构化单元体设计原则相接轨,将整机性能评估方法研究逐渐转向面向单元体性能评估方法的研究。
[Abstract]:With the introduction and implementation of the concept of engine unit design in the field of civil aviation, the defects of the performance evaluation system, which focuses on evaluating the overall performance of the engine, queuing the performance of the whole engine and reporting the engine exhaust temperature margin, are gradually highlighted. In order to improve the economic performance of the engine, the structural design of the unit needs to evaluate the performance of the engine facing the engine from the unit layer. There is an urgent need to establish a performance evaluation system for unit bodies. It is critical to evaluate the performance of engine units and to select the parameters that represent the performance of the units. However, at present, the parameters selected for unit oriented performance evaluation are all based on the performance parameters of the whole engine. Therefore, based on the working principle of the engine, The study of the performance parameters of the characterization unit provides the possibility for the evaluation of engine performance from the whole evaluation to the evaluation of the engine unit. The main content of the research is the selection of performance parameters of the unit: aiming at the traditional evaluation. With the help of certain algorithms, The engine health management system which directly uses measurable parameters to evaluate engine performance is put forward to analyze the performance parameters of core units according to the working principle of the engine, and then combined with measurable parameters. This paper studies the effectiveness of the performance parameters selection of the modern engine performance evaluation system for the unit body, and studies the relationship between the engine performance parameters and the core unit performance parameters. Based on BP neural network, the nonlinear network between core unit volume measurable parameters and Cycles-DEGT performance parameters is constructed to verify the validity of measurable parameters. To further verify the reasonable validity of the performance parameters selected to characterize the unit, the performance evaluation of the unit is oriented to the unit. Taking the core unit of the PW4077D engine as an example, principal component analysis (PCA) and TOPSIS information entropy algorithms are used. The formula for calculating the performance health index of the core unit of PW4077D engine is given. Finally, using the data of PW4077D engine in cruising state to evaluate the performance of the core unit body. The research results are of great significance to promote the research of engine unit body performance evaluation in China. Starting from the working principle of engine unit body, the paper studies the parameters that affect its performance, on the other hand, in order to be in line with the structural unit body design principle, The research on the performance evaluation method of the whole machine is gradually turned to the research of the unit-oriented performance evaluation method.
【学位授予单位】：中国民航大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V263.6

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