Speed and road quality effects on dynamic load multi-purpose forest firefighting vehicles

Abstract

A vehicle’s dynamic load is the force exerted on the tire by the road when the vehicle is in motion. The road is damaged not just by the vehicle’s horizontal and vertical forces, but also by the vertical forces generated by the vehicle’s movement. However, road surface impacts also increase dynamic load and shorten tire life, both of which reduce dynamic safety. This research aims to determine the impact of road condition and vehicle speed on the dynamic load acting on the multi-purpose forest firefighting vehicle. The author created a model using differential equations to describe vehicle vibrations by separating a multi-body system. Using MATLAB software to survey and determine the dynamic load coefficient on the multi-purpose forest firefighting vehicle as it travels over ISO 8608:2016 roads at different speeds. Within the parameters of the standard working speed range, According to ISO standards, the maximum dynamic load factor at the front and the rear left wheel on each of the four types of roads rise in direct proportion to the speed at which the vehicle is moving and the height of the road surface. When a vehicle is traveling at a speed of 25 km per hour on the worst type of road that the author assessed, which was a class E road, the dynamic load coefficient’s maximum value has the following values: maxk_d11 = 2.71, maxk_d31 = 2.75. The rate of travel and the elevation of the roadway both affect the dynamic load coefficient that the vehicle experiences. The findings from the research are going to be used as the foundation for finishing the building of the multi-purpose forest firefighting vehicle.