共查询到20条相似文献,搜索用时 93 毫秒
1.
磁流变技术及其在机械工程中的应用 总被引:7,自引:0,他引:7
磁流变液是近年来得到广泛重视的一种新型的智能软物质,磁流变技术是21世纪机电工程的核心技术之一,文章对国内外磁流变技术的研究概况进行了综述,介绍了磁流变技术及目前在机械工程中的应用情况,分析了磁流变技术研究中存在的问题,最后对磁流变技术的研究发展进行了展望。 相似文献
2.
磁流变液是一种新型智能材料,其屈服强度在外加磁场作用下可以在毫秒量级内发生变化,利用磁流变液剪切应力可以进行动力的传递。本文应用Bingham模型来描述磁流变液的本构方程,在理论上分析了盘式磁流变液离合器的工作机理,导出了设计计算公式,并探讨了离合器设计中应注意的若干技术问题,为盘式磁流变离合器的设计奠定了理论基础。 相似文献
3.
4.
磁流变液是一种在磁场作用下,其流变学性能可作出迅速响应,且易于控制的新型智能材料,本文讨论了磁流变液的流变特性,在分析磁流变液装置基本工作模式的基础上,论述了一种流动模式和剪切模式共同作用的混合模式的磁流变阻尼器的工作原理。论证了这种新型阻尼器的阻尼力能十分灵敏的实现阻尼的目的,在车辆和工程领域具有广阔的应用前景. 相似文献
5.
6.
7.
8.
9.
提出把磁流变液作为电动机软启动装置的工作介质,介绍了磁流变液的特性,利用磁流变液屈服应力的Bingham塑性模型,分析了用磁流变液实现电动机软启动的原理,推导了磁流变液软启动器传递力矩的计算公式。 相似文献
10.
圆盘式MRF离合器的研究 总被引:1,自引:0,他引:1
磁流变液离合器是一种利用磁流变液剪切应力来进行离合的一种装置,它传递的力矩随外加磁场的变化迅速变化。本文在理论上给出了盘式磁流变液离合器的设计方法,推出了磁流变液离合器传递力矩的方程,得出了盘式磁流变液离合器中磁流变液体积、厚度等的计算公式。为盘式磁流变液离合器的设计奠定了理论基础。 相似文献
11.
圆盘型磁流变调速风扇离合器的设计与分析 总被引:2,自引:0,他引:2
磁流变液是一种新型智能材料,其屈服强度在外加磁场作用下可在毫秒量级内发生变化,利用磁流变液剪切应力可以进行动力的传递。将磁流变液用于发动机冷却系风扇离合器的设计中,在理论上分析了盘式磁流变液调速风扇离合器的工作机理,应用Bingham模型来描述磁流变液的本构方程,建立了离合器的输出转矩与转速的计算模型.导出了离合器基本几何参数的工程设计计算公式,为盘式磁流变风扇离合器的设计提供了理论依据。 相似文献
12.
13.
14.
应用B ingham模型来描述磁流变液的本构方程,在理论上分析了盘式磁流变液风扇离合器的调速机理;建立了离合器传递转矩与输出转速的计算模型,并导出了设计计算公式;讨论了动态响应特性、功率损失特性、传递的转矩及调速范围与离合器结构参数等因素的关系。结果表明:影响离合器动态品质的主要因素为其结构参数,减小从动盘的转动惯量可以改善系统的动态特性;离合器的调速范围主要由工作间隙和磁流变液零场粘度决定,减小磁流变液零场粘度和适当增大工作间隙可以减小粘性功率损失,提高效率。 相似文献
15.
基于磁流变液的光整加工技术及其实现装置 总被引:1,自引:0,他引:1
磁流变液是一种新型的智能材料,在说明磁流变液特性的基础上,主要介绍了利用磁流变液实现零件表面光整加工的方法,重点分析了磁流变液光整加工基本原理。在此基础上,提出了实现加工的关键技术问题及解决对策,并设计了一套简易加工装置。 相似文献
16.
Magnetorheological fluid-based finishing (MRFF) process is widely used for fabrication of optical material such as glasses, lenses, mirrors, etc. Performance of the process is significantly affected by the properties (size, concentration, hardness, etc.) of the constituents of MR fluid. MR fluids have been prepared by varying three abrasive particles mean sizes (4 µm, 6 µm and 9 µm) with carbonyl iron particles (CIPs) having average particles size of 6 µm. Yield stress of MR fluids is measured using a rheometer. The composition of the fluid has CIPs of 25%, abrasive 10% (by volume) and rest of the base medium (liquid). The yield stress was evaluated at magnetic flux density of 0.33 Tesla. It is observed that MR fluid having the same particle size of CIPs and abrasive particles exhibits higher yield stress as compared to other combinations. The lowest yield stress is observed in case of 9 µm abrasive particles size. A set of finishing experiments is carried out to understand the effect of relative size of magnetic particles and abrasive particles on surface roughness values. 相似文献
17.
羰基铁粉类型及含量对磁流变液摩擦性能的影响 总被引:1,自引:0,他引:1
分别以羰基型、还原型、磷化型3种类型的羰基铁粉配制不同的磁流变液,采用四球摩擦磨损试验机研究不同类型及含量的羰基铁粉对磁流变液摩擦性能的影响,并考察不同基础油磁流变液体系对羰基铁粉的感受性。结果表明:在硅油体系和矿物油体系中,磷化型羰基铁粉均表现出好于其他2种羰基铁粉的摩擦性能;磁流变液的摩擦因数随着羰基铁粉含量的增加呈现先增大后减小的趋势,当羰基铁粉的质量分数为70%时,磁流变液表现出较好的摩擦性能;矿物油对羰基铁粉的感受性好于硅油。 相似文献
18.
19.
Hostile dynamic loadings such as severe wind storms, earthquakes, and sudden impacts can cause severe damage to many civil engineering structures. An intelligent structural system equipped with smart structural members that are controllable in real-time is an effective solution to structural damage and failure during such situations. Civil intelligent structures with controllable properties to adapt to any changes due to dynamic loadings can lead to effective protection of structures and their occupants. In this paper, design and testing of a semi-active magnetorheological (MR) pin joint, in which the moment resistance can be controlled in real-time by altering the magnetic field, is reported with the view of using it as a potential candidate for smart members in the development of intelligent structures. Design of prototype smart pin joints includes theoretical analysis related to the radius of the rotary plate, the property of MR fluids and the gap between the rotary plate and the casing based on the requirements of the dynamics of MR pin joints. FEM analysis was deployed to study the distribution of the magnetic field along the gap. It is found, from the theoretical analysis and experimental verification, that the MR pin joint with a diameter of 180 mm can produce a torque of up to 30 Nm, which meets requirements for semi-active members in a multi-storey prototype building model in the next stage of research and development. 相似文献