磁流变阻尼器是一种智能半主动减振装置，具有良好的应用前景。但磁流变阻 尼器多以剪切阀为工作模式，此类型阻尼器应用于如液压机械腿、压机调平等力重比较 大场合时，因结构尺寸限制其输出阻尼力不足，使得减振效果不佳。文中针对此问题研 究了一种剪切挤压混合模式磁流变阻尼器，并采用全通道式磁路结构代替传统磁路结 构，以增大阻尼器最大出力和动态范围。本研究对新型磁流变阻尼器进行结构设计、原 理分析，对其进行力学模型的建立、磁场仿真以及结构优化，并通过制作阻尼器样机进 行了试验，结果证明了新型磁流变阻尼器的优越性。由以上试验及仿真得出: 新型磁流 变阻尼器在剪切阀式下阻尼力最大可达 1 065 N，在挤压式下最大可达 4 939 N，尤其是 当活塞线圈通入反向电流时，新型阻尼器在活塞阻尼通道的磁感应强度都在 0. 2 T 以 上，而传统阻尼器的磁感应强度只有近 40% 达到 0. 2 T; 当通入同向电流时，新型阻尼 器在活塞阻尼通道的磁感应强度超过 80% 达到 0. 3 T，而传统阻尼器只有近 40% 达到 0. 3 T。对比于传统磁流变阻尼器，剪切挤压混合模式磁流变阻尼器具有更大的出力值 以及更高的动力可调系数。 

The magnetorheological damper is a kind of intelligent semi-active vibration damping device with good prospects，but the current magnetorheological dampers mostly use shear valves as the working mode． The vibration damping effect of this type of damper is poor when used in hydraulic mechanical legs，press leveling and other areas due to the insufficient output force caused by the size of the structure． In this paper，a shear-extrusion hybrid mode magnetorheological damper was designed to solve the problem，and a full-channel magnetic circuit structure was used to replace the traditional magnetic circuit structure to increase the maximum output and dynamic range． This research carried out the structure design and principle analysis of the new magnetorheological damper，established the mechanical model，simulated the magnetic field，and made optimization on the structure． The superiority of the new magnetorheological damper was proved by the prototype test． The above tests and simulations show that the damping force of the new magnetorheological damper can be up to 1065N in the shear valve type and 4939N in the squeeze type． Especially，when the piston coil is fed with reverse current，the magnetic induction intensity of the new damper in the piston damping channel is all above 0. 2 T，while the magnetic induction intensity of the traditional damper only nearly 40% reaches 0. 2 T． When set the current in the same direction，the magnetic induction intensity of the new damper more than 80% can reaches 0. 3T，while the damping channel of the traditional damper only nearly 40% reach 0. 3T． Compared with the traditional magnetorheological damper，the shear-extrusion hybrid mode magnetorheological damper has a larger output value and a higher dynamic adjustable coefficient．