The Large Magnetorheological Fluid Damper Research And Application

Since 1972 Chinese-Americans J, T, P. Yao made based on classical and modern control theory of the Civil Engineering vibration control concept, many scientists and engineers in the structural design of a controlled manner and method of calculation, a lot of research, Control of vibration theory, the application of practice to have achieved rapid development.The development of intelligent control to control the vibration of Civil Engineering opened a new heaven and earth. Structure of intelligent control system to smart materials and devices for the application of prominent signs. Driving a smart material can create electricity, magnetic or adjust the temperature, and other active control drive and variable damping device, and the efforts, energy consumption of small, rapid response, will become the structure of the future development of vibration control.Magnetorheological fluid damper is an excellent semi-active control devices. Magnetorheological fluid damper its mechanical simplicity, adjustable wide range, low-power, and contribute to the stability, and other advantages arising from a wide range of concerns and applications.Magnetorheological fluid damper be applied in many fields, the huge size of Civil Engineering, Civil Engineering developed for the needs of high-performance structural control of large magnetorheological fluid damper, a device used in the actual project Premise and key.This article focus on large-scale MRF dampers for research. First, review and sum up the domestic and foreign experts and scholars in recent years for intelligent control and magnetorheological fluid damper research and application conditions, the paper described the purpose of the study and proposed a study on the content and value.Second, a large-scale study of MRP damper design and production of key technologies, in access to high-performance magnetorheological fluid, the establishment of a damper design and production of key technologies, mainly technology: a new animal to design and Production technology, magnetic field leak-proof technology, lead-protection technology, magnetic damper anti-settlement technology, magnetic hysteresis adjustment damper technology, magnetic damper constant current controller technology. Civil engineering structures to meet the requirements of practical applications.Third, in the large-scale MRF dampers in the research of key technologies on the basis of their performance, the magnetic interference on the external environment were studied, the paper proposed to amend the Bingham model as the basis, its dynamic model The parameter identification. The results showed that with the current changes, damping force is gradually increasing, and the good performance of energy; damper the largest damping force of test results and theoretical results of a difference little impact on the external environment of virtually no; the parameter identification method is feasible And effective.Fourth, the system of fuzzy neural network structure on the basis of the proposed control strategy based on fuzzy Fuzzy intelligent control methods. Fuzzy intelligent control of intelligent control theory and methods are not dependent on the structure of the mechanical model, fuzzy semi-active control of the control signal only the smallest and the largest two, from the effect of vibration control, the fuzzy semi-active control of better results. This is mainly because the neural network has a good generalization, the non-training samples can be obtained satisfactory results, and, for the current to control the actual MR damping force can take the initiative to better control the tracking fuzzy. Another fuzzy neural network algorithm uncontrolled restrictions, you can connect with various control algorithms create intelligent control.Fifth, through the front of the theoretical research base isolation framework for multi-storey structure, completed the installation of the foundation MR smart device isolation system framework of the multi-storey structure model of theoretical research. The results showed that: passive isolation devices can greatly reduce the framework of multi-storey structure model of the earthquake response to the earthquake, but the isolation of the story too much sway, and security requirements can not be guaranteed. MR isolation system based on smart device performance is better than passive isolation device is a safe and practical isolation device. Fuzzy intelligent control methods can effectively control MR smart isolation system, its effectiveness, than Passive-off control and the effect of passive isolation good. The simulation analysis and test results of the comparison, the paper also confirmed the simulation algorithm and fuzzy intelligent control method.Sixth, the intelligent use of MR damper to curb ship lift at the top of the plant Bianshao effects of the earthquake. As smart materials can be added by changing the electrical / magnetic field to adjust their status, as its means of regulation can be designed to adjustable parameters of the smart damper, and engineering structure of the semi-active vibration control. Simulation analysis and test analysis indicate that, MR intelligent semi-active dampers to be effective in inhibiting shiplift at the top of the plant Bianshao effects of the earthquake.Finally, the completion of the use of MR damper control at the top of the Three Gorges shiplift plant Bianshao effect of the structure of real-time test. The establishment of a real-time sub-structure of the load test equipment and control systems, measurement of the hydraulic servo system lag time and use of neural networks to predict the way of compensation. The existing equipment longer lag time, but a neural network forecasting methods of compensation, achieved good results, making numerical and physical structure of the basic structure of sync to maintain coordination. Compared to passive isolation devices, smart roof MR isolation system to more effectively reduce the ship lift at the top of the plant and seismic Bianshao effect. MR dampers to ensure the isolation of the structure of the damping effect at the same time, good protection for the isolation of the deformation, to improve the performance of the isolation system.