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中文摘要：
传统剪切阀式磁流变阻尼器在活塞上缠绕励磁线圈，导致1／2以上长度阻尼通道无效，影响阻尼器的最大出力。为了克服上述缺陷，在前期概念设计和理论分析的基础上，制作了2个全通道有效的磁流变阻尼器模型，测试了其在不同电流输入状态下阻尼通道处的磁场分布以及力一位移、力一速度等力学性能曲线，并通过对改进型Sigmoid模型的参数识别建立了模型阻尼器的动力滞回模型。研究表明，模型阻尼器阻尼通道处的磁场分布与有限元分析结果基本符合，其磁路结构可较好地实现全通道有效；全通道有效磁流变阻尼器的最大阻尼力比传统剪切阀式磁流变阻尼器的最大阻尼力提高一倍以上，阻尼力调节系数提高70％以上；改进型Sigmoid模型结构形式简单，识别精度高，可作为全通道有效磁流变阻尼器的动力滞回模型。
英文摘要：
Because of the coil enwinded on the piston, half length of the damping path can＇t perform as effective length, which decreases the maximum damping force of the MR damper. In order to overcome this disadvantage, 2 MR dampers with full-length effective damping path are fabricated and tested based on the preliminary work includes conceptual design and theoretical analysis. The magnetic flux densities of the damping path, the force-displacement curves of the damper and the forcevelocity curves of the damper in states with different current inputs are obtained. The mechanical model of the MR damper with full-length effective damping path is built by parameter identification of improved Sigmoid model. The experiment results show that the new-style magnetic circuit can realize the full-length effective theory, and the magnetic flux densities of the damping path in states are consistent with magnetic finite element analysis results. Compared to the traditional shear-valve mode MR damper of the same size, the maximum output powers of the MR damper with full-length effective damping path are 100% increased at least, and the adjustable range.of the output powers is 70% increased at least. The improved Sigmoid model is both simply and precise and can perform as the mechanical model of the MR dampers with full-length damping path effectively.
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