馈能式磁流变阻尼器电磁参数对输出阻尼力的影响研究

Influence of electromagnetic parameters of energy harvesting magnetorheological damper on output damping force

针对馈能式磁流变(MR)阻尼器电磁参数众多,难以对输出阻尼力影响程度进行量化这一问题,提出了一种求解输出阻尼力贡献量的方法。首先,建立了馈能装置的电磁模型,推导了馈能装置感应电动势和主要电磁参数的关系;然后,建立了馈能式磁流变阻尼器电路模型,对馈能装置、整流模块和阻尼器模块进行了分析,得到了干路电流电压和支路电流电压的关系,结合了基尔霍夫定律和Bingham模型,建立了输出阻尼力与关键参数的机电耦合方程;接着,使用了直接求导法,推导了输出阻尼力与关键参数的一阶灵敏度函数关系,研究了灵敏度函数随关键参数的变化规律;最后,定义了关键参数对馈能式磁流变阻尼器输出阻尼力的贡献量,设计了二水平八参数的正交试验,获得了关键参数对输出阻尼力大小的贡献量。研究结果表明:输出阻尼力与关键参数的一阶灵敏度函数具有显著的非线性特征;馈能模块发电线圈内径和发电线圈外径对输出阻尼力的贡献量最大(其中,发电线圈内径对输出阻尼力的贡献量为780.96,发电线圈外径对输出阻尼力的贡献量为715.05),可分别调整发电线圈内径和发电线圈外径,以提高输出阻尼力幅值,进而改善振动半主动控制性能。

Aiming at the problem that it was difficult to quantify the influence degree of output damping force of energy harvesting magneto-rheological(MR)damper due to the numerous electromagnetic parameters,a method to calculate the contribution of output damping force was proposed.Firstly,the electromagnetic model of energy harvesting part was established.The relationship between induced electromotive force and main electromagnetic parameters of energy harvester was derived.Secondly,the circuit model of energy harvesting MR damper was formulated.The energy harvesting part,rectifier part,and damper part were analyzed.The relationship between trunk current and branch current was obtained.Combining Kirchhoffs law and Bingham model,the electromechanical coupling equations of output damping force and key parameters were established.Then,the first order sensitivity function relationship between output damping force and key parameters was derived by direct derivation approach.According to the obtained sensitivity function and the image of key parameters,the changing relation of sensitivity function with key parameters was explored.Finally,the contribution of key parameters to output damping force of energy harvesting MR damper was defined,and the contribution of key parameters to output damping force was obtained by designing a two-level orthogonal experiment with eight parameters.The research results show that the sensitivity function of damping force and key parameters exhibit non-linear characteristics.The inner and outer diameters of coil in the energy harvesting part make most contributions to the output damping force.The contribution of the inner diameter of the generating coil to the output damping force is 780.96,and the contribution of the outer diameter of the generating coil to the output damping force is 715.05.The amplitude of output damping force and vibration semi-active control performance can be improved by adjusting the inner and outer diameters of coil in the generator.