Parameter identification and sensitivity analysis of an improved LuGre friction model for magnetorheological elastomer base isolator

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Journal Article
Meccanica, 2015, 50 (11), pp. 2691 - 2707 (17)
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The recently designed magnetorheological elastomer (MRE) base isolator can provide a fast change in the shear modulus and damping property, which makes it as an ideal device for the semi-active control in buildings and bridges. Previous studies show that this new device is featured with its nonlinear and hysteretic responses, and it is necessary to sufficiently understand its behaviour when adopting this device in operation connected with a control system. Although there are several models presented to predict the hysteresis of MRE base isolator, they are always suffered from some application limitations. To better interpret this complicated feature of the device, this work presents an improved LuGre friction model, which has been successfully used in modelling other magnetorheological (MR) device i.e. MR damper. In addition, an improved fruit fly optimization algorithm (IFFOA) is also proposed to identify the model parameters. In the improved algorithm, a transfer factor based on a self-adaptive step is added together with a three-dimensional searching space. This improvement can enhance the convergence rate of the algorithm and avoid falling into the local optimum. Furthermore, to reduce the complexity of the model, the local and global parameter sensitivity analyses are conducted for model simplification. Eventually, the experimental measurements of device displacement, velocity and shear force are used to evaluate the performance of the proposed model and IFFOA.
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