Development and experimental validation of a numerical multibody model for the dynamic analysis of a counterbalance forklift truck

This work investigates the dynamic behaviour of a prototypal counterbalance forklift truck. The final goal is implementing virtual testing tools to reliably assess the dynamic stresses acting on the specific forklift family of interest during a standard working cycle defined by the manufacturer’s testing protocols. Indeed, unlike most of the other wheeled vehicles, forklifts typically do not have advanced suspension systems and their dynamic response is significantly affected by ground irregularities. Experimental tests are performed on the forklift to measure vibrations at six points of the vehicle when running on a speed bump at constant velocity, which is one of the most critical testing conditions. The experimental measurements are used for validating a rigid multibody model of the complete forklift. After model updating, a satisfactory agreement between numerical and experimental results is achieved.