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4.2 Analysis conditions
Of the traveling test conditions of actual machine, 3 running modes were selected to execute calculation. For this calculation, it was assumed that a loaded vehicle traveled on a hard road surface.
(1) The case of both wheels getting over blocks
Both left and right tires get over blocks at steady-state speed (approx. 5.6km/h) at the same time (Fig. 8).
3) Left-right sudden turn
After traveling at steady-state speed (approx. 15km/h), the vehicle is suddenly turned at its maximum steering speed
(Fig. 10).
4.3 Evaluation points for comparison with actual measurement
4 points at front and rear portions of left and right frames
were selected as evaluation points because it was expected that
comparatively high stress would occur there and that we would
be able to grasp the deformation mode of frame from the behavior of these points (Fig. 11).
4.4 Evaluation by comparing with actual measurement
(1) The ca

4.2 Analysis conditions Of the traveling test conditions of actual machine, 3 running modes were selected to execute calculation. For this calculation, it was assumed that a loaded vehicle traveled on a hard road surface.
4.2 状况分析
对于实车行驶的测试状况，这里有3种运行模式供我们选择。在此计算中，我们假定是一定负荷的车辆行驶在硬路面上。
(1) The case of both wheels getting over blocks
（1）两侧车轮均驶过障碍物
Both left and right tires get over blocks at steady-state speed (approx. 5.6km/h) at the same time (Fig. 8).
左右两侧车轮以固定速度（约 5.6km/h）同时碰到障碍物（图8）。
3) Left-right sudden turn
3）突然的转向
After traveling at steady-state speed (approx. 15km/h), the vehicle is suddenly turned at its maximum steering speed
车辆在以固定速度（约 15km/h）行驶时，突然以其最大转向速度向左或向右转向
(Fig. 10).
（图 10）。
4.3 Evaluation points for comparison with actual measurement
4.3 用于与实际测量比较的评估点
4 points at front and rear portions of left and right frames
were selected as evaluation points because it was expected that