Research on Control Mechanism of Centrifuge Magnetorheological Active Vibration Reduction ![]()
Abstract: This paper uses the magnetorheological vibration damping mechanism to solve the difficult problem of centrifuge vibration damping due to nonlinear vibration. The dynamic model of the magnetorheological shock absorber was constructed through research. The magnetorheological shock absorber of the centrifuge was designed. The fuzzy control principle was used to actively control the magnetorheological shock absorber. Through computer simulation, satisfactory results were obtained. result.
Keywords: centrifuge; magnetic rheology; active vibration control mechanism. Centrifuge is a high-speed rotating mechanical equipment. In the production process, in order to improve the separation effect of the centrifuge, the separation speed is often improved by increasing the speed of the centrifuge . However, as the speed of the centrifuge increases, its vibration problem becomes more and more significant, which becomes one of the important reasons restricting the development of high-speed centrifuges.
In recent years, the emergence of magnetorheological shock absorbers has provided a new way out to solve this problem. The magnetorheological shock absorber can change the viscosity of the magnetorheological fluid (MRF) through the action of electric current, and adjust the damping force of the shock absorber. To achieve the purpose of vibration reduction. However, since the centrifuge vibration process is often nonlinear, the traditional control method is not ideal. This paper intends to use fuzzy control method to actively control the magnetorheological shock absorber, so as to achieve the purpose of optimal control of the centrifuge vibration damping.
1 Research on the mechanism of magnetorheological vibration damping Under the action of a magnetic field, a liquid with good fluidity can greatly increase the viscosity in a very short time (millisecond order), and a phenomenon that appears similar to a semi-solid or solid state is called magnetic Rheology. Generally, when no magnetic field is applied, the particles are randomly distributed as shown in Figure 1 (a); under the action of an external magnetic field, randomly distributed magnetized particles connect the particles end to end, forming a chain structure or a complex network structure as shown As shown in 1 (b), the rheological characteristics (state) of the magnetorheological fluid are changed.
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Magnetorheological vibration damping is to control the vibration of equipment by using the mechanism of the viscosity change agent of magnetorheological fluid to change the rigidity. As shown in Figure 2, under the action of the movable magnetic pole, the magnetorheological fluid usually controls the viscosity of the magnetorheological fluid by changing the current of the excitation coil, changes the damping force generated by it, and improves the damping effect.
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In the formula: —— Dynamic viscosity of magnetorheological fluid
Z—— the length of the polar plate
b—— the width of the polar plate
h ^ —— gap width of the polar plate
v — the relative velocity of the polar plates — the shear yield stress of the magnetorheological fluid when the magnetic field strength is H, ry = KHP, K and Lu are constants related to the magnetorheological fluid
Keywords: centrifuge; magnetic rheology; active vibration control mechanism. Centrifuge is a high-speed rotating mechanical equipment. In the production process, in order to improve the separation effect of the centrifuge, the separation speed is often improved by increasing the speed of the centrifuge . However, as the speed of the centrifuge increases, its vibration problem becomes more and more significant, which becomes one of the important reasons restricting the development of high-speed centrifuges.
In recent years, the emergence of magnetorheological shock absorbers has provided a new way out to solve this problem. The magnetorheological shock absorber can change the viscosity of the magnetorheological fluid (MRF) through the action of electric current, and adjust the damping force of the shock absorber. To achieve the purpose of vibration reduction. However, since the centrifuge vibration process is often nonlinear, the traditional control method is not ideal. This paper intends to use fuzzy control method to actively control the magnetorheological shock absorber, so as to achieve the purpose of optimal control of the centrifuge vibration damping.
1 Research on the mechanism of magnetorheological vibration damping Under the action of a magnetic field, a liquid with good fluidity can greatly increase the viscosity in a very short time (millisecond order), and a phenomenon that appears similar to a semi-solid or solid state is called magnetic Rheology. Generally, when no magnetic field is applied, the particles are randomly distributed as shown in Figure 1 (a); under the action of an external magnetic field, randomly distributed magnetized particles connect the particles end to end, forming a chain structure or a complex network structure as shown As shown in 1 (b), the rheological characteristics (state) of the magnetorheological fluid are changed.
Magnetorheological vibration damping is to control the vibration of equipment by using the mechanism of the viscosity change agent of magnetorheological fluid to change the rigidity. As shown in Figure 2, under the action of the movable magnetic pole, the magnetorheological fluid usually controls the viscosity of the magnetorheological fluid by changing the current of the excitation coil, changes the damping force generated by it, and improves the damping effect.
Z—— the length of the polar plate
b—— the width of the polar plate
h ^ —— gap width of the polar plate
v — the relative velocity of the polar plates — the shear yield stress of the magnetorheological fluid when the magnetic field strength is H, ry = KHP, K and Lu are constants related to the magnetorheological fluid
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