Hydrodynamic response time of magnetorheological fluid in valve mode: an initial study

In this study, the response times of magnetorheological fluids and magnetorheological fluid valves are studied under various flow configurations. Two types of valving geometries, annular flow and radial flow, are considered in the magnetorheological fluid valve designs. The transient pressure responses of magnetorheological fluid valves are evaluated using a diaphragm pump with a constant volume flow rate. The performance of each magnetorheological valve is characterized using a voltage step input as well as a current step input while recording the activation electric voltage/current, magnetic flux density, and pressure drop as a function of time. The variation of the response time of the magnetorheological valves under constant volume flow rate is experimentally investigated. The Maxwell model with a time constant is employed to describe the field-induced pressure behavior of magnetorheological fluid under a steady flow. The results demonstrate that the pressure response times of the magnetorheological fluid and the magnetorheological valves depend on the designs of the electric parameters and the valve geometry. Magnetorheological valves with annular flow geometry have a slower falling response time compared to their rising response time. Magnetorheological valves with radial flow geometry demonstrate faster pressure response times both in rising and in falling states.

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Investigation of the response time of magnetorheological fluid dampers

10.1117/12.539643 ◽

2004 ◽

Cited By ~ 16

Author(s):

Jeong-Hoi Koo ◽

Fernando D. Goncalves ◽

Mehdi Ahmadian

Keyword(s):

Response Time ◽

Magnetorheological Fluid ◽

Fluid Dampers

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Research on Dynamic Response Time of Magnetorheological Fluid Dampers

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.278-280.44 ◽

2013 ◽

Vol 278-280 ◽

pp. 44-49

Author(s):

Jin Qiu Zhang ◽

Lei Zhang ◽

Jie Yue ◽

Yong Qiang Gao ◽

Zhi Zhao Peng

Keyword(s):

Dynamic Response ◽

Response Time ◽

Electrical Power ◽

Magnetorheological Fluid ◽

Electromagnetic Response ◽

Response Process ◽

Tracked Vehicle ◽

Structure Response ◽

Fluid Dampers ◽

Power Response

In this study, one type of magnetorheological fluid dampers (MRD) used in tracked vehicle is chosen as a research object. Firstly, the dynamic response process is analyzed and the dynamic response time of MRDs is defined. In this study, we consider that the dynamic response time of MRDs includes four components, i.e. the electrical power response time, the electromagnetic response time, the response time of magnetorheological fluid (MRF) and the structure response time. The electrical power response time is tested and the electromagnetic response process and the electromagnetic response time of the MRD are analyzed through the method 3D magnetic finite element analysis. Lastly, the response time of the MRD used in tracked vehicle in various working conditions is tested by MRD response time testing system. With the comparison between testing data and analysis of the electromagnetic response process, we can conclude that the structure response time and the electromagnetic response time occupy the largest proportions of the dynamic response time of the MRD and the feasible methods to shorten the response time is to increase rigidity of the MRD system and reduce the eddy effect.

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Initial study of environment-adaptive application placement optimization

10.31224/osf.io/vdn8z ◽

2021 ◽

Author(s):

Yoji Yamato

Keyword(s):

Response Time ◽

High Performance ◽

Initial Study ◽

Adaptive Software ◽

Placement Method ◽

Placement Optimization ◽

Application Placement ◽

The Cost ◽

Network Software

IEICE Technical Workshop on Network Software, BS-25-2.I have proposed environment adaptive software that automatically converts, resource settings, and deploys the code once written according to the deployment destination environment hardware, and operates it with high performance. I also have been working on automatic conversion of code to GPU and FPGA. In this paper, I initially examine an appropriate placement method that satisfies the user's requirements and reduces the cost, response time and so on of an application that has been automatically converted so that it can be placed on GPU or FPGA.

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THE RESPONSE TIME OF A ROTOR SYSTEM WITH A DISK-TYPE MAGNETORHEOLOGICAL FLUID DAMPER

Electrorheological Fluids and Magnetorheological Suspensions (ERMR 2004) ◽

10.1142/9789812702197_0086 ◽

2005 ◽

Author(s):

CHANGSHENG ZHU

Keyword(s):

Response Time ◽

Magnetorheological Fluid ◽

Rotor System ◽

Magnetorheological Fluid Damper ◽

Fluid Damper

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Experimental study of response time of magnetorheological fluid damper

10.1117/12.779889 ◽

2007 ◽

Cited By ~ 1

Author(s):

X. C. Guan ◽

P. F. Guo ◽

C. F. Bian ◽

J. P. Ou

Keyword(s):

Experimental Study ◽

Response Time ◽

Magnetorheological Fluid ◽

Magnetorheological Fluid Damper ◽

Fluid Damper

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THE RESPONSE TIME OF A ROTOR SYSTEM WITH A DISK-TYPE MAGNETORHEOLOGICAL FLUID DAMPER

International Journal of Modern Physics B ◽

10.1142/s0217979205030517 ◽

2005 ◽

Vol 19 (07n09) ◽

pp. 1506-1512 ◽

Cited By ~ 8

Author(s):

CHANGSHENG ZHU

Keyword(s):

Response Time ◽

Magnetic Particle ◽

Volume Fraction ◽

Particle Volume Fraction ◽

Magnetorheological Fluid ◽

Rotor System ◽

Rapid Response ◽

Particle Volume ◽

Magnetorheological Fluid Damper ◽

Fluid Damper

The response time of a rotor system supported upon a disk-type magnetorheological fluid damper operating on shear mode is measured experimentally. The effects of rotating speed, step current and magnetic particle volume fraction, on the response time are dealt with. It is shown that the dynamic response can be described by first 10% response time and rapid response time. Generally, the first 10% response time and the rapid response time are in order of less than 0.1 second and 0.1~0.4 second. The magnetic field strength, magnetic particle volume fraction and power supply have a great effect on the response time. The response time in dropping step current is several times longer than that in applying step current. There is a zero initial delay time at either applying or dropping the current, which is caused by the magnetizing or de-magnetizing process.

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