AN EFFICIENT AND ACCURATE DYNAMIC STRESS COMPUTATION BY FLEXIBLE MULTIBODY DYNAMIC SYSTEM SIMULATION AND REANALYSIS

This paper presents an efficient and accurate method for dynamic stres s computation based on reanalysis in flexible multibody dynamic system simulation. The mode-acceleration concept that is widely used in line ar strucural dynamics was utilized for accuracy improvement. A mode-ac celeration equation for each flexible body is defined and the load ter m in the right hand side of the equation is represented as a combinati on of space-dependent and time-dependent terms so that efficient compu tations of dynamic stresses can be achieved. The load term is obtained from dynamic simulation of a flexible multibody system and a finite e lement method is used to compute stresses by quasi-static analyses. A numerical example of a flexible four-bar mechanism shows effectiveness of the proposed method for flexible multibody dynamic systems such as linkages and vehicle systems.