【作者】 于斌；

【导师】 付旭云；

【作者基本信息】 哈尔滨工业大学 ， 机械工程（专业学位）， 2022， 硕士

【摘要】 航空发动机是飞机的动力装置,其长期处于高温、高速的工作环境中,而其可靠性又直接影响飞机的安全性。又由于航空发动机昂贵的维修费用,在保证航空发动机的可靠性的前提下,进行科学有效的维修维护显得尤为重要。航空发动机单元体维修工作范围指的是该单元体在车间进行的一系列修理措施,其直接影响到发动机单元体修后的性能,进而影响到发动机修后整机的性能。针对现有民航发动机维修工作范围确定方法割裂了部件和整机的关系、评估不准确等问题,本文基于部件与整机的多对一映射关系对航空发动机单元体维修工作范围优化的关键理论和方法进行研究。针对两台发动机同时送修时交换单元体与寿命件可以减少维修成本,开展单元体与寿命件交换策略研究。首先,为确定部件送修前性能、单元体维修级别和部件送修后性能之间的映射关系,进行了部件性能与单元体维修级别关联关系挖掘的研究。针对发动机送修样本较少,进行了基于知识的发动机送修样本的扩充。利用基于混合核函数的支持向量机回归方法,建立了部件性能与单元体维修级别关系模型。为进一步提高模型的准确性,运用粒子群算法对支持向量机回归中的混合核函数的相关参数进行寻优处理,得到了风扇、低压压气机、高压压气机、高压涡轮和低压涡轮五个部件性能和各自单元体维修级别关系模型。其次,为优化发动机单元体维修工作范围求解算法的有效性和合理性,进行了价值导向的单元体维修工作范围研究。基于部件性能和整机性能的映射关系和部件送修前性能、单元体维修级别和部件送修后性能关系,设计开发出了单元体维修工作范围启发式搜索算法,并通过实例验证了算法的准确性。为优化同时送修的两台发动机的维修费用,进行了两台发动机同时送修时单元体与寿命件交换方法研究。该研究分为单元体与寿命件交换方案的评估和单元体与寿命件交换方案的求解。为正确有效的评估两台发动机单元体与寿命件的交换方案,以单台发动机机会维修所需的费用作为参考,计算交换单元体与寿命件后两台发动机机会维修的成本和作为单元体与寿命件交换方案的评价指标。以该维修成本和为适应度函数,使用遗传算法求解部件交换方案。最后开发设计了航空发动机维修工作范围制定系统。更多还原

【Abstract】 Aeroengine is the power unit of aircraft.It works in high temperature and high speed,and its reliability directly affects the safety of aircraft.Because the maintenance cost of aeroengine is very expensive,it is particularly important to carry out scientific and effective maintenance on the premise of ensuring the reliability of aeroengine.The aeroengine maintenance work scope refers to a series of repair measures for the modules in the workshop,which directly affect the performance of the aeroengine modules after repair,and then affect the performance of the aeroengine after repair.In view of the problems that the existed methods for determining the aeroengine maintenance work scope have separated the relationship between the performance of modules and the performance of aeroengine to make inaccurate evaluation,this paper studies the key theories and methods for optimizing the aeroengine maintenance work scope based on the many to one mapping relationship with the performance of modules and the performance of aeroengine.Because the exchange of modules and life-limited parts between aeroengines can reduce the maintenance cost when two aeroengines are sent for repair at the same time,the exchange strategy of modules and life-limited parts is studied.Firstly,to determine the mapping relationship among modules performance before repair,units’ maintenance levels and modules performance after repair,the research on mining the association relationship between modules performance and units’ maintenance levels is carried out.Because of lack of aeroengine maintenance samples,the knowledgebased aeroengine maintenance samples were expanded.Used the support vector machine regression method based on mixed kernel function,the relationship model between modules performance and units’ maintenance levels is established.To further improve the accuracy of the model,the particle swarm optimization algorithm is used to optimize the relevant parameters of the mixed kernel function in the support vector machine regression,and the relationship models between the performance of modules and the maintenance levels of each units are obtained.The modules are fan,low-pressure compressor,highpressure compressor,high-pressure turbine and low-pressure turbine.Secondly,in order to optimize the validity and rationality of the algorithm for solving the aeroengine maintenance work scope,the value oriented areoengine maintenance work scope is studied.Based on the mapping relationship between modules performance and the aeroengine performance,and the relationship between modules performance before repair,units’ maintenance levels and modules performance after repair,a heuristic search algorithm for aeroengine maintenance work scope is designed and developed,and the accuracy of the algorithm is verified.To optimize the maintenance cost of two aeroengines sent for repair at the same time,the exchange method of modules and life-limited parts was studied when two aeroengines were sent for repair at the same time.The research is divided into the evaluation of the exchange scheme between units and life-limited parts and the solution of the exchange scheme between units and life-limited parts.To evaluate the exchange scheme of two aeroengine units and life-limited parts correctly and effectively,taking the cost of opportunity maintenance of a single aeroengine as a reference,calculate the opportunity maintenance cost of two aeroengines after exchanging the units and life-limited parts and use it as the evaluation of the exchange scheme of units and life-limited parts.Taking the sum of the maintenance cost as the fitness function,the genetic algorithm is used to solve the exchange scheme.Finally,the aeroengine maintenance work scope system is developed and designed.更多还原