scholarly journals Design of Magnetic Flux Feedback Controller in Hybrid Suspension System

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Wenqing Zhang ◽  
Jie Li ◽  
Kun Zhang ◽  
Peng Cui
Keyword(s):  
Magnetic Flux ◽  
Feedback Linearization ◽  
Control Algorithm ◽  
Suspension System ◽  
Magnetic Suspension ◽  
Magnetic Flux Density ◽  
Stable Suspension ◽  
State Variable ◽  
Suspension Control ◽  
National University

Hybrid suspension system with permanent magnet and electromagnet consumes little power consumption and can realize larger suspension gap. But realizing stable suspension of hybrid magnet is a tricky problem in the suspension control sphere. Considering from this point, we take magnetic flux signal as a state variable and put this signal back to suspension control system. So we can get the hybrid suspension mathematical model based on magnetic flux signal feedback. By application of MIMO feedback linearization theory, we can further realize linearization of the hybrid suspension system. And then proportion, integral, differentiation, magnetic flux density B (PIDB) controller is designed. Some hybrid suspension experiments have been done on CMS04 magnetic suspension bogie of National University of Defense Technology (NUDT) in China. The experiments denote that the new hybrid suspension control algorithm based on magnetic flux signal feedback designed in this paper has more advantages than traditional position-current double cascade control algorithm. Obviously, the robustness and stability of hybrid suspension system have been enhanced.

Application of Magnetic Flux Feedback Control in Hybrid Suspension System

2013 ◽  
Vol 709 ◽  
pp. 273-280
Author(s):  
Wen Qing Zhang ◽  
Jie Li ◽  
Kun Zhang ◽  
Peng Cui
Keyword(s):  
Magnetic Flux ◽  
Feedback Linearization ◽  
Control Algorithm ◽  
Suspension System ◽  
Magnetic Suspension ◽  
Magnetic Flux Density ◽  
State Variable ◽  
Suspension Control ◽  
Defense Technology ◽  
National University

Hybrid suspension system with permanent-magnet and electromagnet consumes little power consumption, and can realize larger suspension gap. We took magnetic flux signal as a state variable, and put this signal back to suspension control system. So we got the hybrid suspension mathematical model based on magnetic flux signal feedback. With application of MIMO feedback linearization theory, we can realize linearization of the hybrid suspension system. Then PIDB (proportion, integral, differentiation, magnetic flux density B) controller was designed. Some hybrid suspension experiments had been done on CMS04 magnetic suspension bogie of NUDT (National University of Defense Technology) in China. The experiment results denote that hybrid suspension control algorithm based on magnetic flux signal feedback designed has more advantages than traditional position-current double cascade control algorithm. Obviously the robustness and stability of hybrid suspension system have been enhanced.

scholarly journals Decoupling Suspension Controller Based on Magnetic Flux Feedback

2013 ◽  
Vol 709 ◽  
pp. 462-469 ◽  
Author(s):  
Wen Qing Zhang ◽  
Jie Li ◽  
Kun Zhang ◽  
Peng Cui
Keyword(s):  
Control System ◽  
Magnetic Flux ◽  
Feedback Linearization ◽  
Control Algorithm ◽  
State Feedback ◽  
Magnetic Suspension ◽  
System Model ◽  
Suspension Control ◽  
Control System Model ◽  
And Control

Based on MIMO state feedback linearization, the suspension module control system model had been established, and it completed decoupling between double suspension points. Double-suspension system model is very accuracy for investigating stability property and control algorithm of suspension control system. When magnetic flux signal is taken back to control system, suspension modules antijamming characteristics for resisting suspension load variety and external force interference has been enhanced. Some experiments had been done on CMS04 magnetic suspension vehicle in national mid-low speed maglev experiment field of Tangshan city in China. Therefore, the stable property of double-electromagnet suspension control system has been enhanced.

scholarly journals Decoupling Suspension Controller Based on Magnetic Flux Feedback

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Wenqing Zhang ◽  
Jie Li ◽  
Kun Zhang ◽  
Peng Cui
Keyword(s):  
Control System ◽  
Magnetic Flux ◽  
Feedback Linearization ◽  
Magnetic Suspension ◽  
System Model ◽  
Decoupling Method ◽  
Output State ◽  
Suspension Control ◽  
Multiple Input ◽  
Control System Model

The suspension module control system model has been established based on MIMO (multiple input and multiple output) state feedback linearization. We have completed decoupling between double suspension points, and the new decoupling method has been applied to CMS04 magnetic suspension vehicle in national mid-low-speed maglev experiment field of Tangshan city in China. Double suspension system model is very accurate for investigating stability property of maglev control system. When magnetic flux signal is taken back to the suspension control system, the suspension module’s antijamming capacity for resisting suspension load variety has been proved. Also, the external force interference has been enhanced. As a result, the robustness and stability properties of double-electromagnet suspension control system have been enhanced.

Control of Magnetic Suspension Linear Feed System

2012 ◽  
Vol 616-618 ◽  
pp. 1918-1921
Author(s):  
De Jun Liu ◽  
Hui Da Duan ◽  
Zhen Xiong Zhou
Keyword(s):  
Mathematical Model ◽  
Strong Coupling ◽  
Disturbance Rejection ◽  
Suspension System ◽  
Magnetic Suspension ◽  
Linear Motion ◽  
Coupling System ◽  
Suspension Control ◽  
The Mathematical Model ◽  
Feed Device

A magnetic suspension linear feed device has been introduced in this paper, it is consist of linear motion and suspension parts. The mathematical model of suspension system is modeled. Aiming at the suspension part which is an nonlinear and strong coupling system, the auto-disturbance rejection controller (ADRC) is used. The inner disturbance and outside disturbance is observed and compensated, the result of simulation indicates the suspension control A magnetic suspension linear feed device has been introduced in this paper, it is consist of linear motion and suspension parts. The mathematical model of suspension system is modeled. Aiming at the suspension part which is an nonlinear and strong coupling system, the auto-disturbance rejection controller (ADRC) is used. The inner disturbance and outside disturbance is observed and compensated, the result of simulation indicates the suspension control has better dynamic, static and robust characters by using the auto-disturbance rejection controller.

Electromagnetic field hazards involving adjustable shunt valves in hydrocephalus

2002 ◽  
Vol 96 (2) ◽  
pp. 331-334 ◽  
Author(s):  
Thomas Schneider ◽  
Uwe Knauff ◽  
Jürgen Nitsch ◽  
Raimund Firsching
Keyword(s):  
Magnetic Fields ◽  
Magnetic Flux ◽  
Flux Density ◽  
High Frequency ◽  
Magnetic Suspension ◽  
Magnetic Flux Density ◽  
Cellular Phones ◽  
Critical Levels ◽  
Content Type ◽  
Fine Print

Object. Standard therapy for hydrocephalus involves shunts and valves, which are frequently adjustable. Because of increasing “electromagnetic smog” (for example, that generated by cellular phones), these valves are often exposed to electromagnetic fields. Methods. Various magnetic fields were tested for their effects on two different kinds of adjustable valves. The minimum magnetic flux density affecting the adjustment of the valve was determined. Results were compared with magnetic fields found in contemporary everyday life. In homogeneous magnetic fields the adjustment of one valve (Sophysa model SM8) was changed at 5 mT, whereas the second valve (Codman Hakim model CM) was not affected. In nonhomogeneous fields the SM8 valve was affected at 25 mT and the CM valve at 15 mT. Thus, these valves may be affected by headphones and telephone receivers. Surroundings such as the Japanese magnetic suspension railway and the lead cabin of electrical railway engines, in which critical levels of magnetic flux may be present, may also affect adjustable valves. The high-frequency fields of cellular phones, however, have no effect on these valves. Conclusions. Every surgeon who implants these valves and every patient who receives them should know the possible hazards. The valve selection should be adapted to the environment of the patient. Devices with critical levels of electromagnetic flux that are used in the homes of patients should be replaced by ones with lower magnetic fields. The future construction of these valves should be modified in such a way that their adjustment requires a higher magnetic flux density, so that the valves become less sensitive to unwanted effects from environmental magnetic fields.

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