Periodic motion characteristics of an automotive seat height adjustment gear transmission system under multi-source excitations

To reveal the influence patterns of various internal and external excitations, such as errors, clearances, stiffness, rotational speeds, and loads, on the gear transmission system of the height adjuster, and to optimize the vibration and impact generated by these excitations, theoretical modeling, numerical analysis, and simulation verification methods were comprehensively utilized to calculate and analyze the periodic motion characteristics and response amplitudes of the seat height adjuster. The results show that, to prevent the system from entering a chaotic state, the input gear speed should avoid the speed ranges of 1349 r/min-1359 r/min and 1589 r/min-2060 r/min. This work provides a theoretical basis for the selection of operating conditions for the gear transmission system of the height adjuster, and also offers valuable references and insights for engineers and technicians in related fields.