【作者】 杨成；

【导师】 罗虹；

【作者基本信息】 重庆大学 ， 车辆工程， 2012， 硕士

【摘要】 实验测试是检测消声器实际性能的最有效方法，而国内的消声器试验台架不仅功能单一，并且不能很好地模拟高温高速下的消声器实际工作情况，因此围绕高温高速极端条件下的消声器试验台架展开相关设计技术研究具有重要意义。本文以消声器各项性能测试为参照，完成了试验台架的初步概念设计，完成了声源、声源热保护装置以及声源管道的设计工作，搭建了台架流速自动控制系统，完成了流速的自动控制。本文对高温高速下消声器试验台架关键技术研究的具体内容包括：（1）分析试验台架的基本系统组成及其具体功能，完成了试验台架的整体布置设计；（2）通过扬声器的合理选型以及音箱的参数设计，完成了试验台架声源的设计制作，声源的声学性能达到台架要求；（3）通过对直通式声源和旁支式声源的声学性能对比分析，确定直通式声源更符合本试验台架要求；（4）探讨以旁支管（T型管）为基础的声源管道性能，研究各参数对管内声波传播的影响，确定合理的旁支管管道参数，保证声波在管道中的正常传播；（5）针对声源的防风隔热保护，利用具有良好耐热、透声性能的聚酰亚胺薄膜，设计了声源保护结构，使声源在高温高压下的管道中也能正常工作；（6）搭建流速自动控制系统。完成风机、变频器与流量计等重要部件的合理选型，利用RS485通讯接口完成变频器、流量计与上位机之间的数据通讯，以牛顿二分算法为控制算法，利用VB编写流量控制软件，实现流速的自动控制。更多还原

【Abstract】 Experimental test is the most effective way to detect mufflers’ actual performance. Dueto the poor capacity of domestic muffler test bench, the real extreme muffer workingstatus(high tempreture and speed) can’t be simulated. Therefore, researches on themuffler test bench involved with extreme status is of great importance.In this paper, based on varied muffler performance tests, a preliminary conceptualprototype of the test bench is completed. Sound source and the corresponding thermalprotective device are developed. In order to accomplish the highly effective control offlow speed, an flow automatic control system is built up.The key technologies of the muffler test bench (under high temperature andhigh-speed experimental) design include:(1) analyze test bench’s specific function;accomplish the total deployment work of the test bench.(2) by means of laudspeaker’slectotype and laudspeaker box’s parameter design, the sound source ia developed whichmeets the requirements of test bench.(3) based on the comparison of cutthrough andcollateral sound sources, the latter is fit for the test bench.(4) investigate the effect ofcollateral source pipe’s different parameters to its acoustic performance.(5) utilize thepolyimide film which can allow strong sound transmission and resist high tempretureand pressure to develop the sound source hermal protective device, which makes thesound source’s smooth running.(6) built up the flow automatic control system.Accomplish lectotype work of blower, frequency converter and flowmeter, realize thecommunication among them based on RS485communication interface. By means ofnewton dichotomy algorithm and VB platform, the flow control software is designed.更多还原