结果表明：内部声激励能够明显地降低车身模型的空气阻力系数。
It is shown that the technique can obviously reduce the aerodynamic drag coefficient of the model.
汽车迎风面积是指汽车在行驶方向的投影面积，汽车迎风面积是求汽车空气阻力系数的必需参数。
Automotive frontal area is projected area of automobile driving direction, which is necessary parameter of measuring automotive air drag coefficient.
试验数据分析结果表明，不同客车前部造型对气动力影响非常显著，如通过改善造型可使空气阻力系数由0.7509降为0.5759。
The analysis of aerodynamic force data shows that differ front shape is very important to aerodynamic force. For example, coach model air drag coefficient can be lowed to 0.5759 from 0.7509.
采用多车速滑行试验法和功率法对两段法计算结果进行验证，证明了采用两段滑行试验法计算汽车滚动阻力系数和空气阻力系数的正确性。
Then, multi-ample coasting-own data and power calculation method were applied to verifying the results. The results show that the two-stage coast-down test method is correct and feasible.
采用多车速滑行试验法和功率法对两段法计算结果进行验证，证明了采用两段滑行试验法计算汽车滚动阻力系数和空气阻力系数的正确性。
Then, multi-ample coasting-own data and power calculation method were applied to verifying the results. The results show that the two-stage coast-down test method is correct and feasible.
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