nonlinear I非线性积分环节nonlinearadj.非线性的nonlinear vlbration非线性振动nonlinear diffusion非线性扩散nonlinear resonator非线性谐振器nonlinear acoustics非线性声学nonlinear ultrsonic非线性超声nonlinear estimator非线性估计量nonlinear predictor非线性预测器nonlinear component壁厚nonlinear weighting非线性加权nonlinear evolution非线性演化