Compression mode characterizations of magnetorheological elastomers (MREs) involve challenges associated with compensating for the magnetic force generated by electromagnets. Different series of magnetic force and flux measurements were performed in order to establish a general systematic methodology for compensating for the magnetic force. In this regard, an optimal design of a UI-shaped electromagnet was realized to facilitate measurements of the force under controlled magnetic flux density up to 1 T. Results revealed notable phase and magnitude differences between the measured static and dynamic magnetic forces, which are found to be mainly dependent on magnetic flux density and frequency. A simple and powerful compensation model was proposed to accurately predict the magnetic force for the entire range of flux density and excitation conditions considered. The proposed model is experimentally validated, and then employed to identify viscoelastic force of an isotropic MRE. Results revealed maximum errors in equivalent stiffness and damping constants of the MRE in the orders of 90% and 163%, respectively, without compensation. The proposed methodology provides a framework for accurate characterization of MREs in the compression mode.

中文翻译：

---

用于磁流变弹性体压缩模式表征的电磁体磁力补偿

磁流变弹性体 (MRE) 的压缩模式表征涉及与补偿电磁体产生的磁力相关的挑战。进行了不同系列的磁力和通量测量，以建立用于补偿磁力的通用系统方法。在这方面，实现了 UI 形电磁铁的优化设计，以方便在高达 1 T 的受控磁通密度下测量力。 结果显示所测量的静态和动态磁力之间存在显着的相位和幅度差异，这些差异被发现主要取决于磁通密度和频率。提出了一个简单而强大的补偿模型，以准确预测整个磁通密度范围和所考虑的励磁条件下的磁力。所提出的模型经过实验验证，然后用于识别各向同性 MRE 的粘弹性力。结果显示 MRE 的等效刚度和阻尼常数的最大误差分别为 90% 和 163%，没有补偿。所提出的方法为在压缩模式下准确表征 MRE 提供了一个框架。