Finally , base on this and with the conception of object - orient system development , such a system is devised and applied . the paper elaborates the system requirements in detail , defines the system functions and capabilities , and presents the general scheme of the system 文章详细地论证了汽车噪声与振动测量分析系统的需求，定义了系统应实现的功能和需要达到的性能，提出了汽车噪声与振动信号测量分析系统的总体设计方案。
In this paper , it analyzes the mechanism of automobile noise polytechnic and routes of noise propagation , expoundes the research of active control and passive control of the vibration and noise reduction control technology of automobile . then it puts forward the means of automobile noise reduction in practical application 从汽车噪声的产生机理入手,分析了噪声传播的途径,从主动控制与被动控制两方面对汽车减振降噪技术进行了研究,介绍了实际应用的降噪方法
This paper researches on a novel method to measure three - dimensional sound intensity use for failure diagnosis of electro - hydraulic system and the fabrication of a miniature three - dimensional sound intensity probe by using two separate micro - machined pressure probes and one microphone frame 本文研究了声强测量技术在汽车噪声源识别中的应用。通过使用两个微型双麦克风和支撑它们的框架，我们设计了一个小型的声强探测器，用它来实现对汽车噪声源的声强探测。
The sound intensity measurement is carried out for the exterior radiation noise of an automobile and by means of spectrum and correlation analysis of noise signal , an investigation into the application of sound intensity measurement to vehicle noise control is presented . for the main noise sources of automobile - noise of the engines made a distinguish analysis technology and various noise control measures . it is beneficial reference to reduce noise of engine 本文依据声强测量的原理，以汽车噪声源的分析为应用对象；通过对汽车的车外辐射噪声进行了声强测试并对噪声信号进行频谱分析和相干分析，研究了声强测量系统在汽车噪声控制中的应用问题；论述了汽车发动机噪声的鉴别分析技术和各种控制措施，为发动机噪声的降噪工作提供参考。
It is based on a set of practical data in some area . the nonlinear least - square method is used to work out the parameters of the mobile communication channels " model , and then the error sequence comes into being . the noise ' s model of automobile that can reflect the random characteristics of the noise is also founded 本论文采用简单分群的markov二状态模型建立移动信道概率统计模型，从某一移动信道实测曲线出发，利用非线性最小二乘法得出状态模型参数，从而获得移动信道的差错序列；本文对汽车噪声的产生以及它对信号的影响进行了详细的分析，提出了汽车噪声模型；并且采用尖脉冲模拟汽车点火噪声脉冲，实现了噪声对信号的随机干扰，形象地反映了移动信道中信号的叠加过程。
This dissertation aims at the problem of the noise of over length truck falling short of the lately country standard , and makes research on the reason of the gear - box vibrating noise . by combine using finite element analysis and experimental analysis method , the dissertation directly researches the vibrating noise of the gear - box , and takes some availability measures to control vibrating noise from the box surface . by improving the box to reduce its noise , and validate the effect 本文针对一汽超长载重汽车噪声指标不符合国家最新标准的实际问题,对其变速箱振动噪声的产生机理进行深入研究,应用有限元分析与实验分析相结合的方法直接对其进行振动和噪声分析,在此基础上提出控制其振动噪声的有效措施,并通过对其箱体的改进设计,最终达到减振降噪的目的。
To achieve this goal , a powerful set of precise convenient testing and analyzing system is essential . firstly , with view to the present characteristic of vehicle noise and vibration test and analysis , the paper introduces the domestic and international developing status and foreground in this field . then , it expatiates the basal theory and the general structure of vehicle noise and vibration testing and analyzing system 本文着眼于目前汽车噪声与振动测量分析的特点，介绍了汽车噪声与振动测量分析系统的现状与发展，讨论了噪声与振动测量分析系统的一般构成，阐述了噪声与振动测量分析的基础理论和面向对象系统开发思想，并在此基础上运用面向对象技术研制出一套汽车噪声与振动测量分析系统。
