求高手翻译下,有难度的

来源:百度知道 编辑:UC知道 时间:2024/05/25 14:25:02
In this paper, prediction of the back surface reflection, which is based on attenuation and phase velocity dispersion estimation method, in highly attenuating plastic (polyvinylidene fluoride—PVDF) has been described. Estimation of the attenuation law is based on the inverse transfer function of the object approximation in the frequency domain. The oscillating character of the inverse transfer function of the highly attenuating plastic material gives rise to an ill-posed problem for approximation. It has been solved in two ways: application of the Tikhonov regularization process and iterative adjustment of the approximation parameters. The estimated attenuation coefficient α0 and power n have been used for calculation of phase velocity dispersion using the Kramers–Kronig relations and having attenuation coefficient measured at single-frequency value.
The reconstructed waveforms of the ultrasonic back surface reflections using the estimated attenuation and phase velocity dispersio

在本文中,预测背部表面反射,这是基于衰减和相速度色散估算方法,在高衰减塑料(聚偏氟乙烯-聚偏氟乙烯)已被描述。估算的衰减规律,是基于逆传递函数的对象近似的频域。振荡性质的逆传递函数的高度衰减塑性材料产生一种病态问题,为逼近。它已得到解决有两种方式:适用范围tikhonov正则化进程和迭代调整的逼近参数。估计衰减系数α0和功率n已用于计算的相速度色散用kramers - kronig关系,并具有衰减系数测量单频价值。
重建后的波形超声波回面思考用估计的衰减和相速度色散曲线已提交,并与实验之一。
塑胶原料,广泛应用于各个行业,例如,在航天和化学品。在挤出的塑料管材,各种瑕疵可能发生的,其中有负面的影响,对钢管的质量,特别是在天然气领域的应用,而可能导致危险事故和经济损失。应用超声波技术,使质量控制的塑料生产和检测表面缺陷内外的管道,体积缺陷在横向和纵向的方向和包容性的异物。结构参数的高分子材料也有时间依赖性:衰老的影响,温度和应变。这是有可能发现结构的非均匀性的超声波方法中的质量控制。在冷却过程中的熔融塑料结构中的最后一个阶段的制造,这是很重要的监测状态,聚合过程中的塑料,这是显示时间依赖的变化,超声速和吸收因应分子松弛过程。在繁殖的超声波在高分子材料,分子弛豫过程造成显着影响,对超声波。因此,最好的非侵袭性的方法,以监测状态下聚合物的力学性能差,是实时的估计,超声速,这是基于确切时间延迟测量。
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