Vibration and noise suppression in gear transmission systems via monocoque damping structures

Gear transmission system vibrations and acoustic emissions critically influence operational stability and reliability. This study proposes a novel monocoque damping structure, systematically investigating material parameter effects on vibration/noise suppression through integrated gear dynamic modeling, ANSYS finite element analysis (FEA), and orthogonal experimental design. Simulation results reveal the hierarchical influence of material properties on noise characteristics: density ( R = 33.196) > shear modulus ( R = 26.225) > Young’s modulus ( R = 7.821). The monocoque damping configuration demonstrates significant system eigenfrequency reduction, achieving a 26.2% reduction in normal stress and 6–8 dB decrease in sound pressure levels within the 0–1500 Hz low-frequency spectrum. Comparative analysis against traditional profile modification methods highlights the structure’s broadband adaptive capacity, establishing a new paradigm for vibro-acoustic optimization in gear systems.