排气消声器智能方案设计与智能评价

发布时间：2019-01-16 01:36

【摘要】：汽车排气消声器是一种抑制噪声传播而允许气流通过的降噪装置，是降低汽车排气噪声的最主要和最有效的途径。传统的消声器设计过程需要经过一系列复杂的计算以确定基本结构和尺寸参数，并通过大量的实验对结构参数进行反复调整，从而获得较好的消声器设计方案。通常设计周期较长，开发效率低下，因此需要建立一个智能高效的消声器设计平台，从根本上提高消声器的设计效率，缩减开发成本。首先，对消声器的设计流程和设计知识进行归纳总结，提出包含消声目标确定，基本参数设计，发动机频谱分析、整体结构匹配、详细参数设计及设计方案综合评价等流程的消声器智能设计思路；利用可扩展标记语言将设计知识转换为计算机可以理解的推理规则、并结合设计流程与经验公式建立高效的消声器设计知识库。在建立消声器智能设计流程和框架的基础上，对各项实现智能设计的关键技术进行深入研究，给出相应的解决方案。其次，对消声器的各项要求进行分析，提出包含声学性能、空气动力学性能、成本分析和社会因素等多方面的消声器智能评价体系。并利用AHP层次分析法对整个评价过程进行量化，保证评价结果的客观公正性。其中对于二维指标的评价突破了只用平均值的传统评价方法，增加了对不同频段的消声能力，以及较强消声能力和较弱消声能力的考量。并从深层次挖掘出消声器成本和社会因素的具体量化方式。最后，利用VB.Net编程语言开发排气消声器智能设计与智能评价系统，用户输入发动机参数、发动机噪声频谱、空间约束以及消声目标，，系统便会智能的完成消声器的设计过程，并对各设计方案进行智能评价。且在整个设计过程中允许用户根据系统的提示进行人工干预。最终实现了排气消声器的智能设计与智能评价。
[Abstract]:The automobile exhaust muffler is a kind of noise reducing device which can suppress the noise propagation and allow the airflow to pass through. It is the most important and effective way to reduce the automobile exhaust noise. The traditional muffler design process needs a series of complex calculation to determine the basic structure and size parameters, and through a large number of experiments to adjust the structural parameters repeatedly, a better muffler design scheme is obtained. Usually the design cycle is long and the development efficiency is low. So it is necessary to establish an intelligent and efficient muffler design platform to improve the design efficiency of muffler and reduce the development cost. First of all, the design process and design knowledge of muffler are summarized, including the determination of silencing target, basic parameters design, engine spectrum analysis, overall structure matching. Detailed parameter design and comprehensive evaluation of the design scheme flow of the muffler intelligent design ideas; By using extensible markup language (EML), the design knowledge is transformed into a reasoning rule that can be understood by computer, and an efficient muffler design knowledge base is established by combining the design flow and empirical formula. Based on the establishment of the design flow and framework of the muffler, the key technologies to realize the intelligent design are studied in depth, and the corresponding solutions are given. Secondly, the requirements of muffler are analyzed, and an intelligent evaluation system of muffler including acoustics, aerodynamics, cost analysis and social factors is put forward. The evaluation process is quantified by AHP analytic hierarchy process (AHP) to ensure the objective justice of the evaluation results. The evaluation of two-dimensional index breaks through the traditional evaluation method which only uses the average value, and increases the ability of noise suppression in different frequency bands, as well as the consideration of stronger and weaker ability. And dig out the specific quantification way of muffler cost and social factors from the deep level. Finally, the intelligent design and evaluation system of exhaust muffler is developed by using VB.Net programming language. The user inputs engine parameters, engine noise spectrum, spatial constraints and silencing targets. The system will intelligently complete the muffler design process, and the intelligent evaluation of each design scheme. And in the whole design process allows the user to carry on the human intervention according to the system prompt. Finally, the intelligent design and evaluation of exhaust muffler are realized.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U464.134.4;TB535

【参考文献】