The Load Spectrum Compilation of Engine Vibration Fatigue Based on Frequency Rain-flow Counting Method

Abstract

The traditional rain-flow counting method is suitable for conventional fatigue load calculation, and cannot retain the frequency information of vibration fatigue. Frequency is very important for vibration fatigue. Therefore, a frequency rain-flow counting method based on the traditional rain flow counting method is proposed. Taking a certain type of engine test vibration signal as an example, the load spectrum compilation me-thod of vibration fatigue is used to compile the vibration signal power spectrum, load-frequency spectrum, and vibration fatigue load spectrum, and the frequency rain-flow counting method is verified. The results show that the compiled load spectrum can reflect the practical working load of engine, and satisfy the load spectrum requirements of the laboratory fatigue test.

Keywords

• vibration fatigue
• load spectrum
• engine
• rain-flow counting method
• power spectral density