Abstract
Runway roughness is one of the most critical performance factors for runway evaluation, which directly impacts airport operation safety and pavement preservation cost. Properly evaluated runway roughness could optimize the decision-making process for runway preservation and therefore reduce the life cycle cost of the runway pavement asset. In this paper, the excitation effect of runway roughness is analyzed using a coupled aircraft/runway system. The coupled system is composed of a two degrees-of-freedom (2-DOF) aircraft model and a typical asphalt runway structure model established under runway roughness random excitation in this work. The dynamic differential equations for the coupled system are derived based on D’Alembert’s principle. The system’s vibration responses are determined via the pseudo excitation method and three response laws, i.e., the center of gravity acceleration (CGA), the dynamic load coefficient (DLC) of the landing gear, and the runway structural displacement, which are investigated under different modes. The results show that the first-order mode of the runway structure, vertical deformation, is the most significant of the four modes. Moreover, uneven excitation has a significant effect on the distribution of the aircraft’s vibration response. Compared with a single aircraft system, the developed coupled aircraft/runway system has different dynamic responses, and the degree of difference depends on the taxiing speed. The coupled effect on the CGA increases significantly with an increase in speed, with up to a 7.3% percentage difference. The coupled effect on the DLC first increases and then decreases as the aircraft speed increases, reaching a maximum of about 6% percentage difference at 120 km/h.
Highlights
Runway pavement is a civil structure that allows an aircraft to taxi, take off, and land.Runway roughness is one of the most critical performance indicators for runway evaluation, which directly impacts airport operation safety and pavement preservation cost [1]
The power spectral density (PSD) values of the displacements for all four vibration modes are low, and the magnitudes are distributed around 10−6
With an increase in speed, the difference percentage for center of gravity acceleration (CGA) shows a trend of gradual increase, and the overall trend is accelerated. This result suggests that the coupled effect on the CGA becomes increasingly more significant with an increase in speed, with up to 7.3% percentage difference
Summary
Runway roughness is one of the most critical performance indicators for runway evaluation, which directly impacts airport operation safety and pavement preservation cost [1]. Aircraft manufacturers, airlines, etc., are all rightly concerned about the effects of runway roughness on safety, operations, and the service life of both aircraft and runways [3]. Most scholars have researched single aircraft vibration systems and runway structure vibration systems separately, that is, in terms of the vibration response of a single system. Researchers have used runway surface roughness as the model input and investigated only the response output of the single aircraft system, without considering the dynamic effect of the runway system’s vibration on the aircraft system. Using a B727 simulator, Sustainability 2022, 14, 2815.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
