| At present, our country is making efforts to strengthen infrastructure construction, largely driven the development of heavy machinery including heavy-duty trucks. Past five years, sales of heavy-duty trucks in China steady growth year after year, and tend to heavy development. This means that heavy-duty trucks on roads will be more and more. Heavy heavy-duty trucks lead to the factor of safety decreases the safety of heavy-duty trucks can not be ignored, especially in rollover safety.This paper focuses on the roll stability of heavy-duty trucks, mainly for the following aspects of the study.(1)Conduct a static-state rollover test and double lane change test on a heavy-duty truck. Obtain the curve of lateral load transfer rate and the simulated lateral acceleration by processing the tire load results obtained from the static-state rollover test. During the double lane change test, obtain the time history of lateral acceleration and body roll angle. Through analysis of the peak of time histories, calculated out a heavy-duty truck’s gradient of roll angle. Conclude that the changes with speed of body roll angle’s gradient fluctuate around its average.(2)According to the structural parameters of a heavy-duty trucks and the performance of its key components, established a multi-body vehicle dynamic model composed of 14 subsystems. Use the static-state rollover test results and double lane change test results for the authentication of multi-body vehicle dynamic model’s quasi-static response and transient response. Conclude that the matching degree of the multi-body dynamic model and the real truck is very high.(3)Use a validated multi-body dynamic vehicle model for the dynamic simulations of different loading conditions. Make depth analysis of roll stability’s assessment indicators: rollover threshold, lateral load transfer ratio, body roll angle. Conclude that decreasing the loading density and increasing speed will drop heavy-duty truck’s roll stability. |
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