Search Results

In a tractor-trailer, ride comfort affected by horizontal human body motions, so called “wavy” and “shaky” feelings, is at issue. Insight about “wavy” and “shaky” feelings which is important for efficient vehicle development is not enough. Experiments using 6-axis motion generator and motion capture and inverse-analysis using multi-body human model indicated the characteristics of each feeling. Motion observation and transfer function indicated that while a bad subjective score of “wavy” feeling corresponds to same-phase roll motion of chest and pelvis up to 0.7Hz, “shaky” correlates to an antiphase of them around 2Hz. By multiple regression, dominant vibration components of the human body and the vehicle to subjective evaluation of the feelings above were identified. Explanatory variables for the “wavy” feeling are roll rate and lateral jerk and those for the “shaky” are lateral acceleration and longitudinal acceleration.

To understand relationship between vibration on cargo bay of truck and bruise of strawberries in long transportation, a detail analysis of a strawberry-transport was carried out. Vibration in various locations on the truck box was measured throughout the route, and increase of damage to the strawberries was observed at the end of the journey. Also, S-N diagram of strawberries in various frequencies was measured in shaker tests. From these data, a “degree of damage” which can assess the occurrence of bruise was established.