Optimal Adaptive Magnetic Suspension Control of Rotary Impeller for Artificial Heart Pump

In centrifugal pumps for artificial hearts, a magnetic drive with lightly loaded journal bearing system is often used. In such a system, the rigidity of the bearing is small and the impeller usually rotates over the critical speed. In such cases, the rotordynamic fluid forces play an important role for shaft vibration. In the present study, the characteristics of the rotordynamic fluid forces on the impeller were examined. The rotordynamic fluid forces were measured in the cases with/without the whirling motion. It was found that the rotordynamic forces become destabilizing in a wide range of positive whirl. The effect of leakage flow was also examined.

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Construction of an Artificial Heart Pump Performance Test System

Cardiovascular Engineering An International Journal ◽

10.1007/s10558-006-9019-z ◽

2006 ◽

Vol 6 (4) ◽

pp. 151-158 ◽

Cited By ~ 18

Author(s):

Yingjie Liu ◽

Paul Allaire ◽

Yi Wu ◽

Houston Wood ◽

Don Olsen

Keyword(s):

Artificial Heart ◽

Performance Test ◽

Test System ◽

Pump Performance ◽

Heart Pump

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Design of Magnetic Flux Feedback Controller in Hybrid Suspension System

Mathematical Problems in Engineering ◽

10.1155/2013/712764 ◽

2013 ◽

Vol 2013 ◽

pp. 1-7 ◽

Cited By ~ 6

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.

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Bionic women and men: Heart failure and an artificial heart pump

Research Features ◽

10.26904/rf-125-7277 ◽

2019 ◽

pp. 72-77

Author(s):

Eric J. Stöhr ◽

Keyword(s):

Heart Failure ◽

Artificial Heart ◽

Heart Pump

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HEART PUMP AND OXYGENATOR

PEDIATRICS ◽

10.1542/peds.19.6.1124 ◽

1957 ◽

Vol 19 (6) ◽

pp. 1124-1128

Author(s):

W. T. Mustard

Keyword(s):

World War Ii ◽

Artificial Heart ◽

Heart Surgery ◽

Human Subjects ◽

Open Heart Surgery ◽

World War ◽

Heart Pump ◽

The World ◽

Cardiac Bypass ◽

Selection Of

THIS PAPER is a general review of the development of the artificial heart-lung to facilitate open-heart surgery. At the close of World War II many centers began investigating the possibility of total cardiac bypass. Oven the past decade, pump oxygenerators of various types have become popular and recent clinical successes throughout the world have given further impetus to the study of problems posed by the artificial heart-lung apparatus. The subject divides itself into three separate parts, the first two being concerned with the maintenance of life in an experimental animal during a total cardiac bypass. One must take all the blood from the animal and return it to the animal by means of a pump. Secondly, one must oxygenate the blood before returning it. The third part of the problem confronting the surgeon is the selection of cases and correction of defects in human subjects. The pumping mechanism must duplicate as nearly as possible the action of the chambers of the heart. Pumping action must be smooth so as to prevent hemolysis and to avoid turbulence with thrombosis. It is not difficult to construct a pump with which hemolysis can be kept to relatively negligible amounts. Most of the pumps in use throughout the world give an hemolysis of less than 50 mg of hemoglobin per 100 ml of blood, which is perfectly safe. Turbulence with thrombosis can be overcome by removing valves inside the stream and placing valves outside of, rather than within the stream of blood. Furthermore, heparinization of the blood lessens the tendency to thrombosis.

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