考虑缓存因素的发动机缸体生产线可靠性分配研究

发布时间：2018-03-08 20:20

本文选题：发动机缸体生产线　切入点：可靠性分配　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：生产线的可靠性由生产设备可靠性水平以及生产设备连接方式、缓存区设置等多种因素决定。目前生产线的可靠性分配通常对系统设备层级进行分配,缺少对缓存因素的考虑。生产系统一般由生产设备、物流缓存单元、机械手等组成,因此生产线的可靠性分配需要对组成系统的层级进行划分,通过合理的可靠性分配方法将生产线可靠性指标值层层分配到生产设备上,为企业相关设备的选型,维修策略的制定以及合理规划生产线相关设备布局提供有价值的参考。本文重点研究考虑缓存因素的生产线可靠性分配方法,制订了参考生产线的选取原则,同时建立了参考生产线的可靠性框图和模糊成本层次分析模型,运用区间数理论确定生产线成本因素权重,同时引入费用函数理论建立生产线可靠性分配模型,采用基于模拟退火的粒子群(SA-PSO)算法对生产线缓存区容量进行优化分配,最后利用仿真结果得出缓存区容量与生产线可靠性指标之间的关系,从而得出考虑缓存因素的生产线可靠性指标分配值。本文主要研究内容如下:1.结合目标生产线可靠性设计要求,为获取更多试验数据选取了一条发动机缸体生产线作为研究对象,分析了其设备布局并进行可靠性建模。收集整理了故障维修数据,得出了生产线维修时间服从威布尔分布模型。根据生产线开动率定义,建立了固有可用度指标与开动率指标之间关系,将生产线开动率指标转化为生产线可靠性分配指标平均故障间隔工作时间(MTBF)。2.确定了影响发动机缸体生产线可靠性分配的成本相关因素,建立了生产线模糊成本层次分析模型,确定了成本相关因素权重,引入费用函数建立了生产线可靠性分配模型,采用遗传算法求解得出各生产单元可靠性指标分配值。为了将可靠性指标分配到设备级,分别考虑了生产单元包含串行连接设备和并行连接设备的情况,并分别求出了不同情况下生产设备的可靠性指标分配值。3.采用结构化建模对发动机缸体生产线简化分析,保证生产线性能指标不产生明显变化,通过调整生产单元维修率,采用一维遍历搜索方法得到生产节拍转化后同步生产线相关参数。运用迭代合并分析法,建立生产线可用度模型,将退火机制引入粒子更新过程中,采用SA-PSO算法对生产线可用度模型进行求解,最终得到发动机缸体生产线缓存区优化分配结果。4.根据无缓存情况下生产线可靠性分配结果确定瓶颈生产单元,将瓶颈生产单元的上游及下游进行等效合并,建立瓶颈单元仿真模型。通过仿真分析法对比瓶颈单元仿真模型与整线模型的性能指标,证明瓶颈单元仿真模型可以代替整线进行研究,利用Plant Simulation对瓶颈单元仿真模型进行仿真试验,得出缓存区容量与生产线开动率之间函数关系,利用其相互关系重新建立生产线可靠性分配模型,从而得到考虑缓存因素发动机缸体生产线各生产设备可靠性指标分配结果。
[Abstract]:The reliability of the production line by the production equipment and production equipment reliability level of connection, decided to buffer and other factors set. At present, the reliability allocation production line for the equipment level usually distribution, lack of cache factors into account. The production system generally consists of production equipment, logistics and storage unit, such as mechanical hand, so the production reliability allocation the line is divided on system level, the production line reliability index value assigned to layers of production equipment through the reliability allocation method, for selecting the enterprise related equipment, provide valuable reference for the establishment of maintenance policy and rational planning of production line equipment layout. This paper focuses on considering the reliability allocation of production line method of caching factors, formulate the principle of selecting reference of the production line, and establish the reference line reliability block diagram Cost and Fuzzy AHP model, using the interval number theory to determine the weight of production cost factors, while the introduction of cost function theory to establish the production line reliability allocation model based on particle swarm simulated annealing (SA-PSO) algorithm to optimize the allocation of production line buffer capacity, the simulation results show that the relationship between buffer capacity and production line the reliability indexes, thus considering production line reliability allocation cache the value of factors. This paper mainly research contents are as follows: 1. with the goal line reliability design requirements, in order to obtain more experimental data by selecting a cylinder block production line as the research object, analyzes the equipment layout and reliability modeling. Collect fault maintenance the data obtained production line maintenance time obeys the Weibull distribution model. Based on the production line operation rate definition is established The relationship between the inherent availability index and rate index will start, production line utilization rate indicators into production line reliability allocation index mean failure interval time (MTBF).2. the influencing factors of engine cylinder body production line reliability allocation cost, set up the production line cost Fuzzy AHP model to determine the weights of the factors related to cost the introduction of cost function, to establish a production line reliability model, the genetic algorithm was used to solve the production unit reliability allocation value. In order to reliability allocation to the device level, respectively, taking into account the production unit includes a serial connection and parallel connection equipment equipment, and calculates the reliability index distribution under different conditions of production equipment the value of.3. by using structural modeling of engine cylinder body production line to simplify the analysis, ensure the production line performance index is not obvious Change, by adjusting the maintenance unit production rate, the one-dimensional ergodic search methods are transformed into synchronous production cycle production line parameters. Using iterative combined analysis method, establish production line availability model, the annealing mechanism is introduced into the particle update process, the SA-PSO algorithm of the production line can be solved using the cost model, finally get the engine block line buffer allocation according to the results of.4. no cache case reliability allocation results to determine the bottleneck of production unit production line, the production bottleneck unit upstream and downstream of the equivalent merger, establish bottleneck unit simulation model. Through simulation analysis of performance index comparison bottleneck unit simulation model and line model, prove the bottleneck unit simulation model can replace the entire line of research, carried out simulation test for bottleneck unit simulation model using Plant Simulation that caches content The function relationship between quantity and production line start-up rate is established, and the reliability allocation model of the production line is re established based on the relationship between them.

【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TK406

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