基于频率雨流计数法的发动机振动疲劳载荷谱编制

传统雨流计数法适用于常规疲劳载荷计算,不能保留振动疲劳的频率信息,但是频率对于振动疲劳十分重要,因此在传统雨流计数法的基础上提出一种频率雨流计数法。以某型号发动机试车振动加速信号为例,采用振动疲劳载荷谱的编制方法,编制振动信号功率谱、载荷 - 频次载荷谱、振动疲劳载荷谱,对频率雨流计数法进行验证。结果表明:采用本文方法编制的载荷谱能够反映发动机实际工作载荷,满足实验室疲劳试验载荷谱要求。

Develop engine vibration fatigue of load spectrum based on frequency rain flow counting method

The traditional rain flow counting method is suitable for conventional fatigue, but it cannot retain the frequency information of vibration fatigue. Frequency is very important for vibration fatigue. Therefore, a frequency rain flow counting method is proposed based on the traditional rain flow counting method, which can effectively retain the frequency information. Spectrum developing process, and developing vibration fatigue load spectrum. Taking a certain type of engine test vibration signal as an example, determine the load classification to 0.5g, the vibration signal power spectrum, conventional load spectrum, and vibration fatigue load spectrum are developed It provides guidance for the subsequent vibration fatigue life assessment and reliability test of the main components of reusable engines. The results show that the prepared load spectrum can reflect the actual working load of the engine and meet the load spectrum requirements of the laboratory fatigue test .This paper presents a method for develop vibration load spectra suitable for the assessment of vibration fatigue life of similar structures in engineering. Keywords: vibration fatigue; load spectrum; engine; rainflow counting method; power spectral density