Modal analysis and improvement of the frame for all-terrain vehicle

Abstract

Frame is the bearing skeleton of the all-terrain vehicle, and its modal characteristics have a direct influence on the vibration and riding comfort of the entire vehicle. This article intends to investigate a certain domestic all-terrain vehicle whose frame is lengthened on the basis of benchmark vehicle, but this alteration leads to worse modal characteristics. Analytical method and experimental research are adopted for investigating the modal characteristics of this all-terrain vehicle frame. The response of the frame to different terrain roughness and various engine excitations is also discussed with the concluded results of modal analysis. It is found that these two factors are both likely to cause frame resonance. On the basis of the vibration pattern diagrams plotted, three improvement solutions are proposed, including adding transverse supporting beams, increasing the wall thickness of the longitudinal beam, and expanding the thickness of the rear vertical supporting beams. The modal characteristics of these three improvement schemes are also presented with analytical methods, confirming that the measures of adding transverse supporting beams and increasing the wall thickness of the longitudinal beam are feasible. Finally, the modal characteristics of the frame and the vibration of the entire vehicles are obviously improved.

Modal Analysis of Formula Racing Frame

“…For Formula Racing, the frame serves as the carrier of the racing car, bearing the entire weight of the car [1] . During the race, whether the structure of the car frame is reasonable will affect the performance of the car.…”

Analysis and optimization of the spin beam in the CCA-5000 Cuban sugarcane harvester

“…A vehicle is exposed to external excitations, such as the vertical forces in the contact elements with the surface, due to the uneven terrain on which the harvester moves, which produces a deflection in the flexible bodies and as a consequence, a transmission of forces towards the other bodies of the system. In [2], [3], the authors suggest that the diversity of irregularities in the terrain is one of the most significant factors that must be taken into account in the analysis of a vehicle system, as a result of the vibrations originated in the structural elements of the machine. In [4], the authors corroborate that it is common in Cuban agriculture to find examples of machines and implements, both domestic and imported, which suffer deformations in their structure or frequent breakages in their working parts due to the demanding conditions of the terrain and the heavy characteristics of the soils.…”