Impact of Inertial Forces on Car Occupants in a Vehicle-Fixed Barrier Front Crash

Abstract

In most cases, the dynamic investigation of vehicle collisions with stationary obstacles concerns solutions to complex tasks related to the identification of occupant position in the vehicle. The motion of the bodies in the car is determined by the intensity of the inertial coordinate system, also known as moving reference frame, invariably fixed to the vehicle’s center of mass. The focus of the study is on how forces of inertia change their magnitude and direction in the car’s motion. This requires specific analysis carried out by dividing the vehicle trajectory into separate stages according to certain indicators, such as free motion, impact process, and post-impact residual motion. Particular attention has been paid to the impact itself, in which the forces of inertia are the most intense, and their magnitude and direction change abruptly. A solution to a Cauchy problem has been found, in which initial kinematic parameters of the crash process are considered, satisfying the kinematic values at rest position.

Research to Simulate the Ship’s Vibration Regeneration System using a 6-Degree Freedom Gough-Stewart Parallel Robot

“…In this article, for simplicity we assume the ship is in the anchored position, the propeller does not move, ignoring the mass added to the ship, the force of the wind, and the forces acting on the ship include the thrust of the water (force hydrostatic force), gravity, Coriolis force and centripetal inertial force. Therefore, the train's equation of motion in [2] can be written in a simple form as follows: 𝑇 -velocity vector of coordinate system G1 relative to coordinate system G0; M 𝑅𝐵 -mass matrix and inertia tensor of the ship; I 𝐺1 is the ship's inertial tensor with respect to the G1 coordinate system; D 𝑣 -linear viscous friction damping matrix; C 𝑅𝐵 -matrix with components due to the Coriolis inertia force [14] and the ship's radial inertia force. The wave model and ship motion model presented in this section have been used in the wave simulation and ship simulation toolkit of the LINK-SIC center at Linkoping University [7].…”