Investigation of pressure distribution on slippers of a monorail sled with vibration damper

ADMT Journal

مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 14 آذر 1401

نوع مقاله: Original Article

شناسه دیجیتال (DOI): 10.30495/admt.2022.1949929.1334

نویسندگان

Mohammad Reza Najafi¹؛ Saied Mahjoub Moghadas^{* 2}

¹Mechanical Engineering Department, Imam Hossein comprehensive University, Tehran, Iran

²Department of Mechanical Engineering, Imam Hossein University, Tehran, Iran

چکیده

In this paper, the pressure distribution on the slippers of a mono-rail sled with vibration damping is investigated. Due to the many applications of sled testing in the aerospace industry, the study of system vibrations is highly noticeable. In this research, first, by mathematical modelling of the sled, the governing equations are extracted and natural frequencies and vibration modes are obtained from the analytical method using the mass and stiffness matrix of the system. Then, using numerical simulation and validation methods with experimental results performed in wind tunnels, the modal analysis of the designed sled sample is performed. A difference of less than eight percent in both numerical and analytical methods proves the accuracy of the results. The results show that the role of the slipper in the vibrations created in the sled is very important due to the large torsional and transverse oscillations in different positions, and the highest static pressure occurs in the inner layer of the slipper.

کلیدواژه‌ها

Sled test؛ Natural frequency؛ Modal analysis؛ Slipper؛ pressure distribution