Effect of velocity and road quality to the dynamic load acting on the rear axle housing multifunction forest firefighting automotive

A multifunction forest firefighting automotive is a piece of specialized equipment manufactured to solve the problem of a lack of firefighting automotives in Vietnam. When installing specialized equipment for firefighting, the load on the automotive increases, affecting the durability of the details. Meanwhile, the axle housing is an important part of the powertrain, storing all the main parts for transmission, such as the differential and semi-axle. Simultaneously, the axle housing performs the function of a beam, which bears the weight of the body and must be affected by loads from the relationship between the automotive’s wheels and the pavement. When the automotive is operating under the impact of the road surface, it will generate a dynamic bead impact on the axle housing. This paper gives findings from studies that examined the impact of automotive speed on the dynamic beam impact on the drive axle housing cover of a multifunction forest firefighting automotive. In this paper, the author establishes a system of vehicle dynamics equations utilizing the multi-body system and Newton–Euler methods. The dynamic load of vehicles on a straight road with road surface profiles is surveyed using Matlab-Simulink software in accordance with ISO 8608:2016. The research results have determined the greatest load acting on the axle housing as the automotive is in motion on a bumpy road and the dynamic load over time in accordance with ISO 8608:2016 while the automotive is in motion on the road. In accordance with ISO 8608:2016 specifications, the dynamic load factor of a vehicle traveling along an uneven road has not surpassed the permissible threshold. However, in the presence of road obstacles measuring 0.3 m or more in height, the vehicle’s speed must not exceed 15 km/h, this has an effect on the efficacy of forest firefighting in Vietnam due to the extremely irregular forest terrain.