基于复杂度识别的汽车安全评价系统毕业论文.pdfVIP

优秀毕业论文（设计）选（理科卷） 115 基于复杂度识别的汽车安全评价系统 工程技术学院自动化（计算机控制工程） 【摘要】本课题针对汽车变速箱故障问题建立一个汽车状态监测与安全评价系统，该 系统包括两部分：前台系统车载仪器；后台系统软件系统。前台具有简单的分析功能， 可以及时告知车主汽车变速箱发生什么故障，需及时维修，还有低频信号采集与储存故障信 号等功能；前后台通过串口进行通信；后台在 PC 机上，具有数据查找，预处理，信号的分 析，特征的提取以及信号的识别等功能，准确诊断出具体故障，最终实现不解体诊断检测。 本文首先分析了汽车诊断状态参数与结构参数的关系，建立了 FIR滤波、FFT分析子系 统，进而建立了复杂度识别子系统，实现了对信号滤波预处理、FFT频域分析及故障的识别， 进一步建立了基于卡尔曼滤波的汽车状态预测。最后将各子系统联成一体成为汽车状态识别 系统。到共公汽车维修厂进行实验，实验证明该系统能够对汽车故障做出诊断，并能对其状 态进行预测。可得出结论：该系统的信号预处理、分析方法、识别方法是有效的，程序正确。 目前还需大量的实验进行证实系统的针对性、有效性、准确性及稳定性。 关键词：汽车变速箱，数字滤波，快速傅里叶变换，复杂度，卡尔曼滤波 Automobile Safety Evaluation System by Complexity 【Abstract 】The topic of this text is detecting the state and evaluating the safety system of the automobile. This text studies the failure of gearbox. This system has two parts: the apparatus of automobile and software system. The function of apparatus is to collect the failure signal, and then make a simple data processing, conserve the useful data. This apparatus can inform the automobile owner which part of the gearbox is out of work, and then make the necessary maintain. The apparatus sends the data to the software in series. The software runs in the PC, it will distill the character of failure; and it will identify the kind of failure in many ways; the last process is exporting the outcome. In this way, we can detect the failure of the automobile without taking down the automobile. This text analyses the character of the shake in the gearbox, using many ways to upbuild the system. This system has been experimentized in the workshop. We use it to detect the buss gearbox failure. Until now, this system also needs testing and improving. Keywords: Car gearbox. Figure filter. Fast Floure Transform. Complexity. Kalman filter.