CHAPTER 5. CONCLUSION
5.2 Future Work
5.2.2 Three Stage Friction Dynamic Model
The proposed three stage friction dynamic model is a modified version of LuGre model. A notable fitting discrepancy was founded when the friction force is low and the displacements are small. This overshoot is due to the linear approximation of the damping force in stage 2. A possible non-linearity dynamic behavior of the MFD in stage 2 is responsible due to the planned sticking of braking shoes.
Future investigation will include enhanced modeling of stage 2’s dynamics by using a nonlinear stiff-ness element to improve on model fitting. This study will be essential for characterizing the dynamic behavior of rotary friction device.
5.2.3 Input Space Dependent Controller
The main limitation of the proposed adaptive controller is the numerous non-adaptive parameters, such as adaptation weights used in adaptive control gain rule. Although the semi-active control system will never destabilize the structure, the proper select of non-adaptive parameters will improve the control performance under different excitations. Also, the optimal adaption weight for each device in large scale system may be different. Therefore, future work will focus on investigating adaptive rule for these parameters.
In addition, the observation size used in ISDC is pre-defined. It could be made adaptive. For example, sampling rate of sensors and computation speed will directly effect the choice of observation size. The plots of computation time versus observation size in Chapter3are obtained in MATLAB with an Intel i7-4770 3.4 GHz CPU. As a future step, it would be interesting to build an observation size selection rule based on sensor dynamic and CPU speed.
5.2.4 Simulations on Existing Structures subjected to Multi-Hazard
In the numerical simulation, the proposed control systems are placed at multiple locations on ex-isting structures and each ISDC is designed controlling the structural response locally. This limitation is caused by complex implementation of global control system in large scale structure for practical ap-plication. In the future work, we will extend the control objective of ISDC to global performance for simulations on structures. Furthermore, all structural elements remain elastic in the numerical simula-tion due to fundamental structural control object. However, nonlinear behavior of structural elements will be included in future work.
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