Effective acceleration design for solving excessive vibration in the cockpit

Abstract

To address the issue of vibration discomfort caused by excessive vibration in the cockpit, a method that allocates vibration reduction index (VRI) to different vibration transfer paths is proposed. By combining the identified vibration contribution of vibration sources using the transfer path analysis (TPA) method with the evaluated relative difficulty levels of vibration reduction design in these paths through the fuzzy analytical hierarchy process, the allocation weights can be constructed, which enables the VRI at the target location can be allocated to these paths, and effective amplitude values of acceleration transferred by these paths can be designed. Then, the specific process of the method is illustrated by a study case on the acceleration designed at the cockpit floor-seat connection. The results show that to achieve a vibration discomfort level that cannot be felt at this location, the effective acceleration amplitudes transferred from the main landing gear compartments and the engines need to be reduced by at least 61.55 % and 77.23 %, respectively. This method can effectively allocate acceleration transferred and guide the cockpit vibration comfort design.