Cârdei, PetruVlăduț, Nicolae-ValentinBiriș, Sorin-ȘtefanOncescu, Teofil-AlinUngureanu, NicoletaZdravkov Atanasov, AtanasNenciu, FlorinMatei, GheorgheBoruz, SorinPopa, Lorena-DianaTeliban, Gabriel-CiprianMilea, Oana-ElenaDumitru, ȘtefanTăbărașu, Ana-MariaVanghele, NicoletaCismaru, MelaniaRadu, CristianIsticioaia, Simona2026-07-132026-07-132025-09-17https://www.mdpi.com/2076-3417/15/18/10159https://repository.iuls.ro/handle/20.500.12811/6791This study presents a multivariate regression-based analysis aimed at quantifying the influence of key vibration-generating components in two types of grain combines—C110H (with straw walker) and CASE IH (axial flow)—on the operator’s seat (OS). Using triaxial accelerometers, vibrational measurements were performed under both stationary and operational working mode. RMS acceleration values were recorded for major subsystems (engine, threshing unit, chassis, chopper/header) and processed via multiple linear regression. The models generated for each combine and axis (Ox, Oy, Oz) revealed high coefficients of determination (R2 > 0.85), confirming the linear model’s validity. Influence maps and standardized coefficients were used to rank the sources of vibration. Results indicate that the straw walker dominates vibration transmission in the C110H, while the header and threshing system are more significant in the CASE IH. The findings support the development of predictive algorithms for real-time vibration monitoring and ergonomic improvements in combine design. Moreover, the proposed methodology provides a cost-effective diagnostic tool for early fault detection, targeted maintenance, and the long-term reduction of operator fatigue and injury risks.enCC BY 4.0https://creativecommons.org/licenses/by/4.0/vibrationsgrain harvesting combineregression analysisinfluence mapdominant componentssourcesreceiverArticle2076-3417https://doi.org/10.3390/app151810159