Purpose

External sensors are vulnerable to the external magnetic field, temperature, noise, and other factors in the semi-active control system based on magnetorheological (MR) damper, which not only reduces the reliability and stability but also increases the complexity, installation space, and system cost. Meanwhile, mechanical energy is generally dissipated as heat due to the friction between the cylinder and damper piston of the MR damper. To further broaden the applications of MR damper, it is essential to maintain excellent functions when the power supply is cut off in various emergencies. Based on this, a novel MR damper with displacement self-sensing and energy harvesting capability is proposed to solve the problems such as large structural size, high system cost, and vibration energy dissipation.

Methods

Firstly, the structures of the MR damping, displacement self-sensing, and vibration energy harvesting are designed and integrated into the proposed MR damper. Then, the distribution of the magnetic flux density, displacement self-sensing voltage, and energy harvesting efficiency with a single induction coil and double induction coil is obtained using the finite element method. The experimental test system is set up and the performance of MR damping, displacement self-sensing voltage, and energy harvesting efficiency is experimentally tested.

Results

The experimental results show that the damping force reaches 513 N at the applied current of 0.25 A. At the same time, the amplitude of self-sensing voltage increases linearly with the increase of the amplitude of sinusoidal displacement excitation, and the displacement sensitivity comes up to 54.37 mV/mm. Moreover, the self-sensing voltage of the vibration energy harvesting component with a double induction coil is 2.512 V, and the energy harvesting efficiency is about twice than that with a single induction coil.

Conclusions

It is found that the proposed MR damper, with a relatively compact structure and lower cost compared with traditional MR damper, not only promisingly achieves excellent dynamic damping performance but also simultaneously possesses displacement self-sensing ability and energy harvesting capability.

中文翻译：

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具有位移自感应和能量收集功能的新型磁流变阻尼器的性能分析

目的

在基于磁流变（MR）阻尼器的半主动控制系统中，外部传感器容易受到外部磁场，温度，噪声和其他因素的影响，这不仅降低了可靠性和稳定性，而且还增加了复杂性，安装空间以及系统成本。同时，由于MR阻尼器的气缸和阻尼器活塞之间的摩擦，机械能通常作为热量散发。为了进一步扩大MR阻尼器的应用范围，必须在各种紧急情况下切断电源时保持出色的功能。在此基础上，提出了一种具有位移自感应和能量采集功能的新型MR阻尼器，以解决结构尺寸大，系统成本高，振动耗能大的问题。

方法

首先，设计了MR阻尼，位移自感应和振动能量收集的结构，并将其集成到所提出的MR阻尼器中。然后，使用有限元方法获得了单感应线圈和双感应线圈的磁通密度，位移自感应电压和能量收集效率的分布。建立了实验测试系统，并对MR阻尼，位移自感测电压和能量收集效率的性能进行了实验测试。

结果

实验结果表明，在0.25 A的施加电流下，阻尼力达到513N。同时，随着正弦位移激励振幅的增加，自感应电压的幅度线性增加，位移灵敏度上升。至54.37 mV / mm。此外，具有双感应线圈的振动能量收集组件的自感测电压为2.512 V，并且能量收集效率约为单感应线圈的能量收集效率的两倍。

结论

发现所提出的MR阻尼器与传统的MR阻尼器相比具有相对紧凑的结构和较低的成本，不仅有望实现优异的动态阻尼性能，而且同时具有位移自感应能力和能量收集能力。