装軌車両の旋回時における制動履帯下の接地圧力分布の動的挙動
スポンサーリンク
概要
- 論文の詳細を見る
履帯の旋回時における履帯下の接地圧分布および沈下，旋回モーメントの動的挙動について，履帯の形状と静止時の履帯の接地状態，履帯に作用する荷重をパラメータにとり模型実験を行い，それらの動的挙動を観察し，その結果について比較，検討した。また旋回時における履帯下の接地圧および沈下の現象を理論的に考察し，旋回角に伴うそれらの諸量を算定する理論式を導いた。その結果，旋回時における接地圧分布は，履帯中央部下に集中し，沈下および旋回エネルギは履帯の形状比が1に近い程小さく，また履帯中央部の接地面を突出させた場合には，それらが減少することが判明した。また導いた理論式は実験値と同様な傾向を示した。To improve the trafficability and mobility, especially on loose ground, contact pressure distribution beneath the running device of the vehicle should be discussed in detail. Few studies can be found concerned with the dynamic change of the contact pressure distribution pattern beneath the braked track during the steering or turning motion of the vehicle. Most of the related reports have been based upon the assumption that contact pressure beneath the braked track under steering motion can be maintained constantly, the same as it was before the beginning of turning motion. In straight travelling, the increase of the contact area of the running device can help the terrain vehicle in improving its tractive performance. This can be found in the actual construction machinery like a bulldozer equipped with swamp crawler shoes. The pulling operation needs more traction force in straighrt travelling. The enlargement of the contact area of the running device to the ground can decrease the sinkage of the vehicle and it reduces running resistance also. In steering or turning motion of the vehicle, a large contact area will produce more resistance and promote disturbance of the top soil and sinkage. It can be concluded from this fact that the increase of the contact area of the running device can bring greater improvement of the trafficability. However, it can also make a difficult condition for turning motion under steering, due to the resistance produced from the bulldozing motion of the soil around the running device (braked track in this case). For reducing the resistance in turning moition, the contact area should be less. This can be controlled by changing the contact length instead of the width of the track. To obtain smooth and less resistant turning, the contact area should be decreased by shortening the contact length. In this paper, it was found that the contact pressure distribution pattern can be varied and concentrated on the center point of the braked track with the progress of turning motion. The result of this study can be practically applied to an actual machine to reduce the resistance of the vehicle under turning motion by adding the simple mechanism of pivot supporting system for the braked track at its center point.
- 三重大学農学部の論文