Analysis of vibration due to combined misalignments in loaded spur gear systems

Abstract This study investigates a single stage spur gear transmission system subjected to combined misalignments, such as parallel (radial and axial) and angular (yaw) misalignments, under varying load conditions. Two load levels were analysed: 0.1 Nm for "no load" and 1.2 Nm for "loaded" conditions. The input variables are combined misalignments and reaction loads, while the output variable is the vibration measurement taken at the bearing supports. These measurements were used to assess the effect of misalignment and load on the vibrational behaviour of the system. The test bench used for the experimental runs consists of a 2 hp motor and a hydraulic system that allows the reaction torques to be controlled. The results show that although the acceleration values vary under different load conditions, the overall trend remains consistent as long as no significant deformation occurs in the gears. Furthermore, the type of misalignment that most influences the variation in acceleration is yaw misalignment.