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当板的厚度较大和变化时，如厚板或阶梯类的板，这时板的剪切、转动惯量及板的面内运动，将对板结构的振动功率流产生影响。基于功率流的分析方法和梁、板动力学的原理，推导了梁一阶梯板耦合结构的功率流表达式。计算和测量结果表明：振动频率较低时，板厚比增大使得从梁传递到阶梯板的功率流减小；振动频率较高时，梁－阶梯板结构的传递功率流小于梁－薄板结构的传递功率流。在这类板结构功率流估计中应注意这些差异，否则将引起功率流估计的误差。
When the thickness of the plate is large and changes, such as a thick plate or a stepped plate, the shearing, the moment of inertia, and the in-plane motion of the plate will affect the vibration power flow of the plate structure. Based on the analysis method of power flow and the principle of beam and plate dynamics, the power flow expression of the beam-ladder coupling structure is deduced. The calculation and measurement results show that the power flow from the beam to the stepped plate decreases when the vibration frequency is low, and the power flow from the beam to the stepped plate decreases when the vibration frequency is low. When the vibration frequency is high, the transmitted power flow of the beam-ladder plate structure is smaller than that of the beam-sheet structure. The passing power flow. In the power flow estimation of this kind of plate structure, these differences should be noted, otherwise it will cause the error of the power flow estimation.