本文研究了发动机振动信号的预处理和对信号的时域、幅域分析。
Pretreatment and Time-domain analysis were studied to the vibration signal of aero-engine in this paper.
针对汽车发动机振动信号的非线性特点，将分形理论应用于发动机的故障诊断。
By researching the characteristic of automobile engine, the fractal theory was used to diagnosis the fault of engine.
为了实现移动装备发动机缸盖振动信号的在线处理，提出一种基于提升小波包变换的渐变式阈值降噪方法。
In order to on-line process engine cylinder head vibration signals of mobile equipment, a de-noising method with gradual changing threshold based on lifting wavelet package transform was proposed.
分析了移动装备发动机缸盖振动信号的时频特性，介绍了插补细分提升小波包变换算法。
The lifting wavelet package transform based on interpolating subdivision was introduced. The engine cylinder head vibration signal's time-frequency characteristics were analyzed.
为了在地面实验中监测航空发动机的振动情况和进行故障诊断，研制了高速数据采集系统、信号处理系统以及基于模糊聚类方法上的故障诊断系统。
The high speed data sampling and signal analysis system is investigated for vibration monitoring and fault diagnosis of aircraft engine in the case of stationary experiments.
传统的振动分析常采用傅立叶分析法，对于柴油发动机某些非平稳振动信号，傅立叶分析可能给出虚假的结果，从而导致错误诊断。
As for some of the unsteady vibration signals of diesel engine, false result may be provided by using Fourier analysis, thus error diagnosis would be induced.
将其应用于发动机缸盖振动信号降噪，取得了满意的效果。
It was applied in de-noising for engine cylinder head vibration sign…
本文讨论了活塞撞击引起的发动机振动特性，指出利用表面振动信号判断活塞缸套间的间隙状态是可行的。
Based on the engine vibration character induced by the piston impact on the cylinder, it is practical to judge the clearance condition between them by engine surface vibration intensity.
当发动机转速变化较大，振动信号非平稳严重时，高精度地提取出了特征分量的参数。
Although the engine's rotational speed changes notable and the vibration signal is seriously nonstationary, the character component's parameter is picked up precisely.
当发动机转速变化较大，振动信号非平稳严重时，高精度地提取出了特征分量的参数。
Although the engine's rotational speed changes notable and the vibration signal is seriously nonstationary, the character component's parameter is picked up precisely.
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