中文摘要：

提出一种利用磁致伸缩传感器在金属杆（探杆）中激励超声导波扭转模态,用于液体黏滞系数测量的新方法.与基于导波波速的理论测量模型（波速模型）相比较,分析基于导波衰减系数的理论测量模型（衰减模型）的优势,并通过数值仿真分析衰减法模型中频率、探杆材料以及直径3个参数对测量结果的影响.根据磁致伸缩传感器系统设计原理,针对被检测液体黏滞系数范围,给出满足系统整体最佳衰减值为1 Np或限制在0.5～5 Np范围内要求的传感器系统最佳设计参数.利用衰减法对不同浓度（质量分数）的丙三醇溶液的黏滞系数进行试验测量,结果显示,试验测量值与传统方法测得的参考值,以及理论模型预测曲线相吻合,表明该方法可用于牛顿液体黏滞系数的测量.

英文摘要：

A new method for liquids viscosity measurement is proposed.Magnetostrictive sensor is employed for exciting ultrasonic torsional guided wave in a metal rod probe.The guided wave energy attenuation coefficient measurement model（attenuation model） and velocity measurement model（velocity model） are numerically analyzed.The advantages of attenuation model are highlighted,and the influence of its three parameters including operation frequency,probe material property and rod diameter are investigated.The parameters of the magnetostrictive sensor-based measurement system are optimized to meet the requirements of precisely measuring the liquids with a given viscosity range.The attenuation coefficient of a optimal sensing system must be equal to 1 Np or in the range of 0.5-5 Np.The viscosity of glycerine-water solutions with different concentrations（mass fractions） are measured based on attenuation model.The experimental results are well agreed with the results obtained from traditional measurement method and theoretical model prediction curves.That is,the proposed method can be applied for measuring viscosity of liquids.