Measurements of Rotordynamic Forces on an Artificial Heart Pump Impeller

2007 ◽  
Vol 129 (11) ◽  
pp. 1422-1427 ◽  
Author(s):  
Takayuki Suzuki ◽  
Romain Prunières ◽  
Hironori Horiguchi ◽  
Tomonori Tsukiya ◽  
Yoshiyuki Taenaka ◽  
...  
Keyword(s):  
Artificial Heart ◽  
Journal Bearing ◽  
Centrifugal Pumps ◽  
Pump Impeller ◽  
Fluid Forces ◽  
Heart Pump ◽  
Wide Range ◽  
Artificial Hearts ◽  
Rotordynamic Forces ◽  
Magnetic Drive

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.

1301 Measurements of Rotordynamic Forces on Artificial Heart Pump Impeller in Whirling Motion

2006 ◽  
Vol 2006.81 (0) ◽  
pp. _13-1_
Author(s):  
Takayuki SUZUKI ◽  
Romain PRUNIERES ◽  
Hironori HORIGUCHI ◽  
Yoshinobu TSUJIMOTO ◽  
Tomonori TSUKIYA
Keyword(s):  
Artificial Heart ◽  
Pump Impeller ◽  
Whirling Motion ◽  
Heart Pump ◽  
Rotordynamic Forces

scholarly journals The Rotordynamic Fluid Forces on an Artificial Heart Pump Impeller in Whirling Motion

2007 ◽  
Vol 73 (725) ◽  
pp. 205-212 ◽  
Author(s):  
Takayuki SUZUKI ◽  
Romain PRUNIÈRES ◽  
Hironori HORIGUCHI ◽  
Tomonori TSUKIYA ◽  
Yoshiyuki TAENAKA ◽  
...  
Keyword(s):  
Artificial Heart ◽  
Pump Impeller ◽  
Fluid Forces ◽  
Whirling Motion ◽  
Heart Pump

scholarly journals A Numerical Analysis of Rotordynamic Fluid Forces on an Artificial Heart Pump Impeller in Whirling Motion

2008 ◽  
Vol 74 (738) ◽  
pp. 310-316 ◽  
Author(s):  
Takayuki SUZUKI ◽  
Koichi YONEZAWA ◽  
Hironori HORIGUCHI ◽  
Tomonori TSUKIYA ◽  
Yoshiyuki TAENAKA ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Artificial Heart ◽  
Pump Impeller ◽  
Fluid Forces ◽  
Whirling Motion ◽  
Heart Pump

scholarly journals The Rotordynamic Fluid Forces on a Shaft Support Part of Artificial Heart Pump Impeller in Whirling Motion(Fluids Engineering)

2009 ◽  
Vol 75 (752) ◽  
pp. 770-779
Author(s):  
Takayuki SUZUKI ◽  
Koichi YONEZAWA ◽  
Hironori HORIGUCHI ◽  
Tomonori TSUKIYA ◽  
Yoshiyuki TAENAKA ◽  
...  
Keyword(s):  
Artificial Heart ◽  
Pump Impeller ◽  
Fluid Forces ◽  
Whirling Motion ◽  
Heart Pump

scholarly journals Experimental Results for the Rotordynamic Characteristics of Leakage Flows in Centrifugal Pumps

1994 ◽  
Vol 116 (1) ◽  
pp. 110-115 ◽  
Author(s):  
A. Guinzburg ◽  
C. E. Brennen ◽  
A. J. Acosta ◽  
T. K. Caughey
Keyword(s):  
Flow Rate ◽  
Tangential Force ◽  
Fluid Structure Interaction ◽  
Centrifugal Pumps ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Fluid Forces ◽  
Leakage Flows ◽  
Clearance Face ◽  
Rotordynamic Forces

In recent years, increasing attention has been given to fluid-structure interaction problems in turbomachines. The present research focuses on just one such fluid-structure interaction problem, namely, the role played by fluid forces in determining the rotordynamic stability and characteristics of a centrifugal pump. The emphasis of this study is to investigate the contributions to the rotordynamic forces from the discharge-to-suction leakage flows between the front shroud of the rotating impeller and the stationary pump casing. An experiment was designed to measure the rotordynamic shroud forces due to simulated leakage flows for different parameters such as flow rate, shroud clearance, face-seal clearance and eccentricity. The data demonstrate substantial rotordynamic effects and a destabilizing tangential force for small positive whirl frequency ratios; this force decreased with increasing flow rate. The rotordynamic forces appear to be inversely proportional to the clearance and change significantly with the flow rate. Two sets of data taken at different eccentricities yielded quite similar nondimensional rotordynamic forces indicating that the experiments lie within the linear regime of eccentricity.

scholarly journals Some Unsteady Fluid Forces on Pump Impellers

1992 ◽  
Vol 114 (4) ◽  
pp. 632-637 ◽  
Author(s):  
R. S. Miskovish ◽  
C. E. Brennen
Keyword(s):  
Fluid Flow ◽  
Centrifugal Pump ◽  
Bending Moments ◽  
Pump Impeller ◽  
Spectral Analyses ◽  
Fluid Forces ◽  
Radial Forces ◽  
Unsteady Fluid ◽  
Rotordynamic Forces ◽  
Centrifugal Pump Impeller

Spectral analyses of all the forces and moments acting on a typical centrifugal pump impeller/volute combination are presented. These exhibit shaft frequencies, blade passing frequencies, and beat frequencies associated with a whirl motion imposed on the shaft in order to measure rotordynamic forces. Among other features the unsteady thrust was found to contain a surprisingly large blade passing harmonic. While previous studies have explored the magnitudes of the steady fluid-induced radial forces and the fluid-induced rotordynamic forces for this typical centrifugal pump impeller/volute combination, this paper presents information on the steady bending moments and rotordynamic moments due to the fluid flow. These imply certain axial locations for the lines of action of the radial and rotordynamic forces. Data on the lines of action are presented and allow inferences on the sources of the forces.

scholarly journals A Numerical Analysis of Rotordynamic Fluid Forces on an Artificial Heart Pump Shaft Support Part(Fluids Engineering)

2009 ◽  
Vol 75 (752) ◽  
pp. 780-786
Author(s):  
Takayuki SUZUKI ◽  
Bingwei SONG ◽  
Koichi YONEZAWA ◽  
Yoshinobu TSUJIMOTO ◽  
Tomonori TSUKIYA ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Artificial Heart ◽  
Fluid Forces ◽  
Heart Pump ◽  
Pump Shaft

Rotordynamic Forces Acting on Three-Bladed Inducer Under Super-Synchronous/Synchronous Rotating Cavitation

2008 ◽  
Author(s):  
Yoshiki Yoshida ◽  
Masato Eguchi ◽  
Taiichi Motomura ◽  
Masaharu Uchiumi ◽  
Hirotaka Kure ◽  
...  
Keyword(s):  
Cavity Length ◽  
Active Magnetic Bearings ◽  
Fluid Forces ◽  
Wide Range ◽  
Cavitation Instability ◽  
Cryogenic Flow ◽  
Shaft Vibration ◽  
Rotordynamic Forces ◽  
Relationship Of ◽  
The Relationship

Asymmetric cavitation, in which cavity lengths are unequal on each blade, is known as a source of cavitation induced shaft vibration in turbomachinery. To investigate the relationship of the uneven cavity length and rotordynamic force in a cavitating inducer with three blades, we conducted two experiments. In one, the growth of cavity unevenness at the inception of synchronous rotating cavitation in cryogenic flow was observed, and in the other, the rotordynamic fluid forces in water were examined by using a rotordynamic test stand with active magnetic bearings. Rotordynamic performances were obtained within a wide range of cavitation numbers and whirl/shaft speed ratios included super-synchronous/synchronous rotating cavitation. These experimental results indicate that the shaft vibration due to the rotating cavitation is one type of self-excited vibrations arising from the coupling of cavitation instability and rotordynamics.

Rotordynamic Forces Acting on Three-Bladed Inducer Under Supersynchronous/Synchronous Rotating Cavitation

2010 ◽  
Vol 132 (6) ◽  
Author(s):  
Yoshiki Yoshida ◽  
Masato Eguchi ◽  
Taiichi Motomura ◽  
Masaharu Uchiumi ◽  
Hirotaka Kure ◽  
...  
Keyword(s):  
Cavity Length ◽  
Active Magnetic Bearings ◽  
Fluid Forces ◽  
Wide Range ◽  
Cavitation Instability ◽  
Cryogenic Flow ◽  
Shaft Vibration ◽  
Rotordynamic Forces ◽  
Relationship Of ◽  
The Relationship

Asymmetric cavitation, in which cavity lengths are unequal on each blade, is known as a source of cavitation induced shaft vibration in turbomachinery. To investigate the relationship of the uneven cavity length and rotordynamic force in a cavitating inducer with three blades, we conducted two experiments. In one, the growth of cavity unevenness at the inception of synchronous rotating cavitation in cryogenic flow was observed, and in the other, the rotordynamic fluid forces in water were examined by using a rotordynamic test stand with active magnetic bearings. Rotordynamic performances were obtained within a wide range of cavitation numbers, and whirl/shaft speed ratios included supersynchronous/synchronous rotating cavitation. These experimental results indicate that the shaft vibration due to the rotating cavitation is one type of self-excited vibrations arising from the coupling of cavitation instability and rotordynamics.

Use of a Catecholamine Sensor in the Control of an Artificial Heart System

1997 ◽  
Vol 20 (1) ◽  
pp. 37-42 ◽  
Author(s):  
K. Mabuchi ◽  
T. Chinzei ◽  
Y. Abe ◽  
K. Imanishi ◽  
T. Isoyama ◽  
...  
Keyword(s):  
Control System ◽  
Plasma Proteins ◽  
Artificial Heart ◽  
Circulatory System ◽  
Reference Electrode ◽  
Mock Circulatory System ◽  
Real Time Measurement ◽  
Artificial Hearts ◽  
Set Up ◽  
Catecholamine Concentration

An electrochemical sensor system to allow real-time measurement and feedback of catecholamine concentrations was developed for use in the control of artificial hearts. Electrochemical analyses were carried out using a carbon fiber working electrode, an Ag-AgCI reference electrode, and a potentiostat. The operating parameters of the pneumatically-driven artificial heart system were altered in accordance with the algorithm for changes in the catecholamine concentration. The minimum detectable concentrations of both adrenaline and noradrenaline in a mock circulatory system using a phosphate-buffered solution were approximately 1-2 ng/ml (10-8 mol/L). An artificial heart control system utilizing this set-up performed satisfactorily without delay, although sensor sensitivity decreased when placed in goat plasma instead of a phosphate-buffered solution, due to the adsorption of various substances such as plasma proteins onto the electrodes. This study demonstrated the future feasibility of a feedback control system for artificial hearts using catecholamine concentrations.

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