抄録
Baby carriage vibration causes unpleasant sensations for both babies and carriage driver, and this vibration is one of factors effecting safety and comfort. In order to reduce baby carriage vibration, this research developed a multibody dynamics simulation model to use mechanical design. To calculate the vibration of baby carriage passing through a leveldifference of road surface, some baby carriage simulation models are developed. The rigid-body model (only the elastic deformation of suspensions) and the elastic-connection model (using rotational springs to model movements between parts around carriage legs) are developed. Next, elastic deformation of front legs is analyzed by finite element method. However, dynamic analysis containing finite element method take immense amount of time. For effect analysis of elastic deformation of front legs, this research developed the front leg elastic-body model which consist rigid-bodies connecting by translational and rotational springs. The analytical time of this model is shorter than the model using finite element method. Experiments using a real baby carriage equipped with an accelerometer are conducted. The vibration of the shaft between wheels, the front leg, and the armrest are measured. This research focuses on the front leg vibration because specific vibration is generated in this part. To verify the validity of the simulation model, simulation results and experimental ones are compared. The rigid-body model and the elastic-connection model are not enough to capture high frequency vibrations. The analytical vibration waveform using the front leg elastic-body model is in fairly good agreement with the experimental one. Therefore, it is possible to analyze baby carriage vibration passing through a level-difference of road surface by this simulation model. In addition, simulation examples of using this simulation model are shown.
