A contribution to the study of thermal loads of hydraulic and active mounts of powertrain of a freight motor vehicle

Abstract

Due to the excitation from the road micro unevenness, powertrain vibration and conditions of motion (acceleration, braking, curved motion)

Development of a Method for Defining the Torsional Stiffness of the Frame in the Initial Phase of Designing a Heavy Motor Vehicle

“…A heavy motor vehicle defined by the project task is developed in further design phases, where creative and intuitive approaches that played a significant role in the project task development give way to logical and objective factors, calculations, measurements, shaping, evaluations of production and technological capabilities, etc. [1,2].…”

“…The conceptual design represents the first concretization of the project task, and its main goal is to define the parameters of the driver's ergo-sphere and the external dimensions, mass, and performance of the cargo vehicle, as well as its stylistic indicators necessary for further work on the project [1,2] heavy motor vehicle. This paper will discuss the development of a method for defining the torsional stiffness of the frame based on its transverse vibrations.…”

“…Other parameters are not mentioned here because they are not of particular importance for defining the torsional stiffness of the frame or investigating its transverse vibrations. For illustration purposes, Figure 1a shows the silhouette of the heavy motor vehicle defined by the project task [1].…”

“…The dimensions of the corresponding frame profiles should be determined based on their flexural and torsional stiffness. It is emphasized that in practice, an approximate relationship between the stiffness of the springs and the torsional stiffness of the frame is defined [1]. However, since the parameters of the vehicle suspension system are not known in this design phase, the desired torsional stiffness of the frame cannot be precisely defined...…”

“…Therefore, it was deemed appropriate to calculate the equivalent height of the frame for the analysis of transverse vibrations based on the mass balance. Namely, it is recommended in [1,2] that the frame of the vehicle should account for 11-15% of its mass. Since it is a lighter heavy motor vehicle, it will be assumed that this share is 12%, which means that the mass of the frame is 840 kg.…”