User Profile-Driven Load Spectrum Analysis for Commercial Vehicle Engine Vibration Test

doi:10.3969/j.issn.1001-2222.2025.06.011

Vehicle Engine ›› 2025, Vol. 0 ›› Issue (6) : 72-77. DOI: 10.3969/j.issn.1001-2222.2025.06.011

LIU Haichao,ZHU Weidong,KOU Chuanfu,ZHANG Bo,ZENG Qinglong,WANG Tianling

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Abstract

To ensure that commercial vehicle engines and the auxiliary components meet load intensity requirements reflective of actual user operational scenarios during development, thereby preventing over-testing or under-testing issues, an integrated systematic framework was established. First, scenario-based user profile analysis and load spectrum testing were implemented on a specific engine model, capturing vibration data under simulated real-user road conditions and accelerated test-track environments. Subsequently, spectral analysis and tolerance upper-bound estimation were conducted on the measured data, and periodic-random vibration signals separation was performed with an engineering truncation method. Finally, an accelerated validation load spectrum for engines and accessories was synthesized based on load spectrum generalization theory and damage equivalence principles, followed by comparative analysis against ISO 16750 standards. The results show the synthesized load spectrum exhibits similar spectral shape to that of ISO standard but differs in frequency ranges and amplitude distributions. The acceleration calculation was carried out according to the measured spectrum with a bench validation duration of 94 hours and a lifespan of 1.2 million kilometers. The root mean square (RMS) vibration energy values achieved in the longitudinal, lateral, and vertical loading directions are 169.3 m/s², 171.3 m/s², and 172.9 m/s², respectively. Independent characterization for vibration levels across three loading directions of the measured acceleration spectrum can better reflect the actual application conditions of product. This study presents a validated methodology for optimizing vibration durability test specifications and improving reliability and durability assessments of engine systems.

Key words

engine / user association / test specification / random vibration / load spectrum

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LIU Haichao, ZHU Weidong, KOU Chuanfu, ZHANG Bo, ZENG Qinglong, WANG Tianling. User Profile-Driven Load Spectrum Analysis for Commercial Vehicle Engine Vibration Test[J]. Vehicle Engine. 2025, 0(6): 72-77 https://doi.org/10.3969/j.issn.1001-2222.2025.06.011