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A CWT-based methodology for piston slap experimental characterization

机译：基于CWT的活塞拍击实验表征方法

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摘要

Noise and vibration control in mechanical systems has become ever more significant for automotive industry where the comfort of the passenger compartment represents a challenging issue for car manufacturers. The reduction of piston slap noise is pivotal for a good design of IC engines. In this scenario, a methodology has been developed for the vibro-acoustic assessment of IC diesel engines by means of design changes in piston to cylinder bore clearance. Vibration signals have been analysed by means of advanced signal processing techniques taking advantage of cyclostationarity theory. The procedure departs from the analysis of the Continuous Wavelet Transform (CWT) in order to identify a representative frequency band of piston slap phenomenon. Such a frequency band has been exploited as the input data in the further signal processing analysis that involves the envelope analysis of the second order cyclostationary component of the signal. The second order harmonic component has been used as the benchmark parameter of piston slap noise. An experimental procedure of vibrational benchmarking is proposed and verified at different operational conditions in real IC engines actually equipped on cars. This study clearly underlines the crucial role of the transducer positioning when differences among real piston-to-cylinder clearances are considered. In particular, the proposed methodology is effective for the sensors placed on the outer cylinder wall in all the tested conditions.
机译：机械系统中的噪声和振动控制对于汽车行业来说变得越来越重要，因为对于汽车制造商来说，车厢的舒适性是一个具有挑战性的问题。活塞拍击声的降低对于IC发动机的良好设计至关重要。在这种情况下，已经开发出一种方法，通过改变活塞到气缸孔的间隙来对IC柴油机进行振动声学评估。利用先进的信号处理技术，利用循环平稳性理论对振动信号进行了分析。该过程不同于对连续小波变换（CWT）的分析，以便确定活塞拍击现象的代表性频带。在涉及信号的二阶循环平稳分量的包络分析的进一步信号处理分析中，已将这种频带用作输入数据。二阶谐波分量已用作活塞拍击噪声的基准参数。提出了振动基准测试的实验程序，并在实际安装在汽车上的真实IC发动机中的不同运行条件下进行了验证。当考虑到实际的活塞到气缸间隙之间的差异时，这项研究清楚地强调了传感器定位的关键作用。特别地，所提出的方法对于在所有测试条件下放置在外圆柱壁上的传感器都是有效的。

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