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Diagnostic-oriented vibroacoustic model of the reciprocating engine

机译：往复式发动机的面向诊断的振动声学模型

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The method of modelling the signal of vibrations of the internal combustion engine based on the discrete wavelet transform (DWT.) is presented in the paper. This method is suitable for the representation of transient processes, which occurs in the vibroacoustic signal (VA) generated by the engine. The model is identified on the basis of the vibration signal recorded when the car is driving at a constant speed. The base model and its measures are created for the new engine and the control measurements, performed either at the determined time periods or car mileage, are compared to them. This base model must be actualised after each engine overhaul and as its wear and tear progresses, due to changes of the vibration characteristics. On account of a random character of vibration responses the envelope of the modelled signal is utilised for diagnostic purposes. The model based diagnostic method was verified in the paper on the example of the engine exhaust valve defect.
机译：提出了一种基于离散小波变换（DWT。）的内燃机振动信号建模方法。此方法适用于瞬态过程的表示，该过程出现在发动机产生的振动声信号（VA）中。该模型基于汽车以恒定速度行驶时记录的振动信号进行识别。为新发动机创建基本模型及其度量，并将在确定的时间段或汽车行驶里程上执行的控制度量与它们进行比较。由于振动特性的变化，必须在每次发动机大修后以及随着磨损的进行而实现该基本模型。由于振动响应具有随机性，因此将建模信号的包络用于诊断目的。本文以发动机排气门缺陷为例，验证了基于模型的诊断方法。

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