EXPERIMENTAL ANALYSIS OF THE DYNAMIC BEHAVIOR OF A CAR TRAILER

Abstract

The paper presents the experimental research on the dynamic analysis of an one axle trailer drawed by a vehicle, both on a rolling road without imperfections at a approximately speed of 40 km/ h, and on an obstacle area, to analyze the influence of uncontrolled disturbing dynamic effects in the system analyzed. For each analyzed situation, the data acquisition was made simultaneously on three channels, the accelerometers being mounted on the end of the trailer frame, near the gripping point on the towing vehicle, and the other two accelerometers on the trailer frame, one on the left and the other on the right side of it. Thus, dynamic analysis has highlighted that the identification of frequencies corresponding to the own modal shapes of the trailer's structure is hampered by the interference in the spectral composition of the specific parasitic modes to the other structural elements in the trailer configuration. The predominant evolution of certain vibration modes of the structure resistance is dictated (and at the same time limited) by the type and characteristics of the excitation, as well as by the monitoring system configuration (the number of transducers, their type of mounting, the position and the directions monitored etc.).