根据“承力区假说”，建立了牙轮钻头钻进岩石过程的数学模型和模拟方法。

The mathematical model and analogy method for the penetrating process of roller bits arc established according to the load-bearing region hypothesis.

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实验结果与模拟结果吻合得较好，证明此文所建立的数学模型和模拟方法是可行的。

The results obtained in the experiments are in good agreement with ones acquired in the simulation.

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为了建立发动机数学模型和验证CRUISE软件模拟计算的精度，分别做了发动机稳态试验和整车性能试验。

The engine stable experiment and passenger car road test were done in order to build the engine model and testify the accuracy of the simulation by CRUISE.

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