Comparative Investigation of Phenomenological Modeling for Hysteresis Responses of Magnetorheological Elastomer Devices
Abstract
:1. Introduction
2. Overview of Phenomenological Models for MRE Materials and Devices
2.1. Kelvin–Voigt Model
2.2. Four-Parameter Viscoelastic Model
2.3. Rheological Model
2.4. Bouc–Wen Model
2.5. Improved Bouc–Wen Model
2.6. Dahl Model
2.7. LuGre Friction Model
2.8. Strain Stiffening Model
2.9. Hyperbolic Hysteresis Model
2.10. Model Summary
3. Dynamic Tests of Magnetorheological Elastomer Device
3.1. Design of the MRE Isolator
3.2. Dynamic Test of MRE Device
3.3. Test Results
4. Modeling Results and Discussions
- Step 1.
- Determine the fitness function and model parameters to be identified.
- Step 2.
- Set the algorithm parameters of GA: the number of chromosome Nc = 30, mutation probability pm = 0.01, crossover probability pc = 0.7, maximum iteration number Tmi = 200.
- Step 3.
- Define the ranges of the parameters to be identified.
- Step 4.
- Encode the chromosomes for the model parameters. Initialize the chromosomes randomly and the initial iteration value is set as ti = 0.
- Step 5.
- Evaluate the fitness value of each individual and compare the current value with previous one.
- Step 6.
- Use the roulette wheel method to choose part of the chromosome to generate new chromosome.
- Step 7.
- Conduct the crossover and mutation operations to update the chromosome.
- Step 8.
- Check the stopping criterion. If the current iteration number is smaller than the maximum iteration number, go back to Step 5; otherwise, the algorithm is terminated.
5. Conclusions
- (1)
- The results indicate that all the models show high accuracy in characterizing force–displacement responses under low excitation amplitude. However, the Kelvin–Voigt model, four-parameter viscoelastic model, and rheological model could not effectively track the strain hardening phenomenon of the MRE device under high current levels and large deformation.
- (2)
- All the models are able to perfectly predict the variation tendencies of effective stiffness and equivalent damping properties of the MRE device with loading amplitude and applied current level, although the prediction accuracies have some variations between the different models.
- (3)
- The improved LuGre friction model, improved BW model, and Dahl model have the best performances in terms of their absolute errors between experimental results and model predictions, with the shortest range between lower and upper boundaries.
- (4)
- Based on the statistical evaluation indices, the improved LuGre friction model has the optimal performance with values of 0.9994 for R-squared, 2.5461 for RMSE, 1.5942 for MAE, and 15.8788 for MAPE.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Abbreviations
MRE | Magnetorheological elastomer |
AI | Artificial intelligence |
BW | Bouc–Wen |
VSDI | Variable stiffness and damping isolator |
GA | Genetic algorithm |
ES | Effective stiffness |
ED | Equivalent damping |
RMSE | Root mean square error |
SAES | Summation of absolute error squares |
TSS | Total summation of squares |
MAPE | Mean absolute percentage error |
MAE | Mean absolute error |
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Model | Advantages and/or Disadvantages | Reference |
---|---|---|
Kelvin–Voigt model | The Kelvin–Voigt model is capable of effectively illustrating viscoelastic behavior of MRE system under given loading conditions. The drawback is that it lacks the ability to numerically characterize the material system. | [21] |
Four-parameter viscoelastic model | The field-dependent modulus and damping capacities can be well characterized. | [28] |
Rheological model | Besides the viscoelastic behavior, the field-dependent mechanical properties and interfacial slippage between polymer matrix and the particles are also considered in the rheological model. | [29] |
Bouc–Wen model | The hysteretic behavior of MRE device can be well characterized. However, a large number of parameters should be identified and a highly nonlinear differential equation is incorporated that increases the challenge for the controller design. | [31] |
Improved Bouc–Wen model | Compared to BW model, improved BW model introduces more parameters to better portray the hysteretic responses of MRE device. | [32] |
Dahl model | The Dahl model can be regarded as a special case of the general BW model, and it has fewer model parameters than the BW model, with the benefit of good computational efficiency. | [26] |
LuGre friction model | The friction dynamics of the MRE device can be modeled by LuGre friction model. Its main disadvantage is that the model lacks a term to describe the Stribeck effect [39], which may be apparent at low velocity areas. | [33] |
Strain stiffening model | The strain stiffening phenomenon of MRE materials and devices can be well captured by this model. However, two differential equations in the model expression increase the challenge for model parameter identification. | [22] |
Hyperbolic hysteresis model | The hyperbolic hysteresis model has simple model structure with only four parameters. The main advantage of this model is that it does not have any differential equation in the model. | [30] |
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Yu, Y.; Li, J.; Li, Y.; Li, S.; Li, H.; Wang, W. Comparative Investigation of Phenomenological Modeling for Hysteresis Responses of Magnetorheological Elastomer Devices. Int. J. Mol. Sci. 2019, 20, 3216. https://doi.org/10.3390/ijms20133216
Yu Y, Li J, Li Y, Li S, Li H, Wang W. Comparative Investigation of Phenomenological Modeling for Hysteresis Responses of Magnetorheological Elastomer Devices. International Journal of Molecular Sciences. 2019; 20(13):3216. https://doi.org/10.3390/ijms20133216
Chicago/Turabian StyleYu, Yang, Jianchun Li, Yancheng Li, Shaoqi Li, Huan Li, and Weiqiang Wang. 2019. "Comparative Investigation of Phenomenological Modeling for Hysteresis Responses of Magnetorheological Elastomer Devices" International Journal of Molecular Sciences 20, no. 13: 3216. https://doi.org/10.3390/ijms20133216