نوع مقاله : مقاله پژوهشی
موضوعات
عنوان مقاله English
نویسندگان English
Exposure to helicopter vibrations during flight and maneuvers can lead to long-term physical strain on pilots, particularly in the low-frequency range (0–20 Hz). While seat suspensions provide some vibration isolation, the seat cushion plays a critical role in overall ride comfort. This study presents an integrated computational and experimental investigation of nonlinear polyether polyurethane seat cushions and their effect on helicopter pilot comfort. Ride comfort is initially analyzed using a 4-DOF biodynamic model and subsequently extended to a 5-DOF model to explicitly include seat cushion dynamics. Experimental measurements of both linear and nonlinear stiffness and damping properties are conducted through modal analysis tests, providing data for model validation. Results demonstrate that considering nonlinear cushion behavior significantly improves predictions of transmissibility, mechanical impedance, and apparent mass, showing strong agreement with experimental observations. The findings highlight the importance of accurate nonlinear modeling for the design of seat cushions that enhance vibration isolation and improve overall pilot ride comfort.
کلیدواژهها English
