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针对拖拉机缩尺模型车室和实际车室之间的声学特性关系问题，引用相似理论进行了初步探索，找出了试验研究过程中所遵循的相似准则，并导出它们的声学特性间的定量关系，这些关系在试验中得到较好的验证，结果表明用缩车模型车室代替实际车室研究其声学特性是可行的。
Aiming at the relationship between the acoustic characteristics of the tractor scale model car and the actual car room, the similarity theory was used to find out the similar criteria to be followed in the experimental research and to derive the quantitative relationship between them . These relationships are well verified in the experiments. The results show that it is feasible to study the acoustic characteristics of the vehicle compartment instead of the actual vehicle compartment.