【作者】 崔冰；

【导师】 张立；

【作者基本信息】 吉林大学 ， 控制理论与控制工程， 2004， 硕士

【摘要】 本文研究的主要内容是对汽车性能检测数据处理系统进行可靠性设计，检测系统可靠性设计的缺陷，会造成检测结果的不准确，从而给用户带来经济上的损失甚至安全隐患。因此，对汽车性能检测数据处理系统进行可靠性设计，是建立汽车检测线的最基本的要求，同时也会带来更大的经济效益和社会效益。针对汽车性能检测数据处理系统对可靠性设计的要求，本文从两方面进行了设计。首先：为了提高检测系统的信噪比和检测精度，本文在深入分析了检测现场的干扰的基础上，提出了基于小波变换的离散信号滤波算法，并通过计算机仿真分析验证了算法的有效性和适用性。将该算法应用到车辆动态称重系统和制动性能检测系统中，对测量信号进行滤波处理，结果表明，该算法具有很强的滤波效果和跟踪性能，能够有效地提高系统的信噪比和测量精度；其次：为了提高传感器输出标称值数据的可信度，本文在分析了多种影响传感器输出状态的因素的基础上，提出了基于信息融合估计的传感器故障诊断方法，并通过计算机仿真分析验证了该方法的有效性。本文的研究工作主要为以下四个部分：对离散信号的滤波方法进行分析本文对汽车性能检测系统数据采集的可靠性设计方法进行了探讨，并对软件可靠性设计和抗干扰技术进行了分析，通过对多种离散信号滤波算法的分析比较后提出一种切实可行的滤波方法——基于小波变换的信号滤波方法。对车辆动态称重算法进行研究本文对车辆动态称重技术进行了阐述，分析了车辆动态称重系统中的干扰与抑制干扰的方法；建立了动态称重系统的数学模型，并对三种动态称重数据处理算法进行了误差分析，证明了小波变换法在动态称重数据处理中的有效性。 <WP=79>对车辆制动性能曲线进行分析本文对车辆制动性能检测系统的组成、检测项目、技术要求以及影响制动性能检测的因素作了介绍，并对三种制动力检测设备的优缺点进行了分析比较；通过小波变换对制动性能曲线进行分频、降噪处理，得到了较为理想的制动性能曲线，为制动性能的判定奠定了良好的基础。采用信息融合方法提高检测可靠性本文对信息融合技术作了介绍，分析了故障诊断与信息融合的关系，并对信息融合技术在本汽车性能检测系统中的应用作了详细的介绍，通过信息融合方法提高了检测的可靠性。总之，本检测系统的可靠性设计方案将会对其它工业测控系统的研制起到一定的示范作用。本文提出的基于小波变换的离散信号滤波算法以及信息融合技术都具有广泛的适用性、可靠性、先进性和完整性。对可靠性设计地进一步研究和应用必将推动工业现场检测技术的发展，具有重要的理论价值和实用价值。更多还原

【Abstract】 The main work of the paper is the reliability design of the automobile performance testing data processing system. The limitation in the reliability design of the testing system will make testing result inaccurate and take clients a great loss even hidden trouble in safety. Consequently, the reliability design of the automobile performance testing system which is of primary importance in building the testing system can take great economic benefit and social benefit.Aiming at the request in the reliability design of automobile performance testing data processing system, the paper designed it in two aspects. Firstly, in order to improve the proportion between signal and noise and the testing precision of the testing system, this paper bringed forward a wavelet-based filtering algorithm and then validated the validity and applicability of the algorithm through computer’s emluator on the basis of analyzing the disturbance of the testing field. Applying the algorithm to the dynamic weighing system and braking performance testing system. The result indicated that the algorithm has strong filtering effect and it can improve the proportion between signal and noise and the testing precision of the testing system effectively. Secondly, in order to improve the reliability of the sensor’s datum, this paper bringed forward a information-fusion-based sensor fault diagnosis process and then validated the validity of the algorithm through computer’s emluator on the basis of analyzing manifold factors that affect the state of sensors.There are four parts in the paper:Firstly, analyzing the filtering algorithm of discrete signal.This paper discussed the reliability design method of data-collection in the automobile performance testing system, and then bringed forward an effective <WP=81>filtering algorithm, wavelet-transform-based filtering algorithm through analyzing diversiform filtering algorithm of discrete signal.Secondly, researching the algorithm of dynamic weighing.This paper expatiated the dynamic weighing technology, analyzed the disturbance of the dynamic weighing system and the method of restraining disturbance; upbuilded the mathematics modeling of the dynamic weighing system and analyzed the three algorithm of dynamic weighing. Consequently it validated the validity of the wavelet-transform-method in the dynamic weighing data processing.Thirdly, analyzing the braking performance curve.This paper introduced the buildup, testing item, technology request of the braking performance testing system and the factors that influence the braking performance testing, and then gained the perfect braking performance curve through wavelet-transform.Fourthly, improving the testing reliability by using information fusion method.This paper introduced the information fusion technology, analyzed the relation between fault diagnosis and information fusion and introduced the application of information fusion technology in the automobile performance testing system. It improved the reliability of testing by using information fusion method.Anyway the reliability design project of the testing system will influence other testing systems. Both the wavelet-transform-based discrete signal filtering algorithm and the information fusion technology which presented in this paper have broad applicability, reliability and integrality. The farther research and application to reliability design will promote the development of industry field testing technique and have important theoretic value and practical value.更多还原