This paper made a analyses for load transmission principle of piles on weak fundation, and deductived simple method to determine effective length of the extra long piles.
阐明了声波透射法的原理和方法 ，通过实测工程表明该方法是检测长桩桩身混凝土质量的一种行之有效的手段 ，并提出了现场准确可靠地采集和分析数据的措施。
Owing to the modified error in principle, the manufacturing error and the variation of the load, there still exists the mesh impact in the transmission of modified spur gear.
由于存在修形原理误差、齿轮加工误差以及载荷工况的变化，渐开线修形齿轮在使用中仍会有啮合冲击现象。
According to the principle of mechanical transmission, the mathematical model of transmission system, composed of the engine, the electromagnetic clutch, CVT and the load, is established.
本文针对由发动机、离合器、CVT传动系统和汽车载荷构成的汽车整体模型，建立了无级变速汽车传动系统数学模型。
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