Vibration isolation system combining zero-power magnetic suspension with springs

Mizuno, Takeshi; Takasaki, Masaya; Kishita, Daisuke; Hirakawa, Keiichiro

doi:10.1016/j.conengprac.2006.06.001

Cited by 88 publications

(52 citation statements)

References 21 publications

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“…Frequency response of the vibration isolation system to direct disturbance magnet to produce negative stiffness as treated in Section 5 (Mizuno et al, 2003a). The other is to use a nonlinear spring to produce positive stiffness (Mizuno et al, 2003b). Figure 4.7 shows a frequency response of the system to direct disturbance.…”

Section: Single-axis Systemmentioning

confidence: 99%

Vibration Isolation System Using Negative Stiffness

Mizuno¹

2010

Vibration Control

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Section: Single-axis Systemmentioning

confidence: 99%

Vibration Isolation System Using Negative Stiffness

Mizuno¹

2010

Vibration Control

Self Cite

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“…The principle of realizing infinite stiffness and respective zero compliance (8) are explained in this section. The zero compliance means zero relative displacement of the isolation table with respect to the base.…”

Section: Concept Of Displacement Cancellationmentioning

confidence: 99%

“…To achieve the two necessary conditions of complete vibration isolation, the infinite stiffness and the low stiffness suspension in the control system simultaneously we proposed series combination of isolators and addition of middle mass between series connected isolators (6)(7) . For active negative stiffness we have proposed zero power magnetic suspension controlled system with relative displacement sensors instead of servo-type accelerometers (8)(9) . Zero power magnetic suspension control system has itself unique characteristic that it behaves as if it has negative stiffness, when an external force is applied to the suspended object.…”

Section: Introductionmentioning

confidence: 99%

Development of Three-Axis Active Vibration Isolator Using Displacement Cancellation Technique

Shahadat

Mizuno

Ishino

et al. 2011

JSDD

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A three-degree-of-freedom (3-DOF) active vibration isolation system using displacement cancellation control technique is developed. The displacement cancellation concept is presented and implemented in this research to obtain zero compliance of vibration isolation table against direct static force as well as to suppress the dynamic disturbances acting on the isolation table. In the displacement cancellation control technique, relative movements of the vibration free table are followed with I-PD control and movements of the middle mass respect to base are controlled with PD control. The corresponding controllers are designed in such way so that actuator can generate opposite force against disturbance to cancel the effect of displacement of the middle mass on the vibration isolation table, which finally leads zero compliance of the isolation table. Voice coil motors (VCMs) are used for getting linear actuating effect and corresponding displacements of the table are detected by eddy-current gap sensors. The experimental results showed that the developed system with displacement cancellation mode control has capability to maintain zero compliance against direct static force in the 3-DOF motions associated with horizontal translations and a vertical rotation. Moreover experiments have been conducted to measure the dynamic responses of the vibration isolation table to direct disturbance.

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“…A unique characteristic of the zero-power control system is that it behaves as if it has a negative stiffness; when an external force is applied to the floator in zero-power controlled systems, the floator moves to a new equilibrium position located in the direction opposite to the applied force. A novel vibration isolation system using this property is proposed which has high stiffness against direct disturbance (8), (9) .…”

Section: Introductionmentioning

confidence: 99%

Zero-Power Control of Parallel Magnetic Suspension Systems

Mizuno

Sakurada

Ishino

et al. 2011

JSDD

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This paper discusses the feasibility of zero-power control in parallel magnetic suspension systems. In parallel magnetic suspension systems, multiple floators are suspend with a single power amplifier. The zero-power control has been used in magnetic suspension systems with permanent magnets providing bias flux. This control realizes the steady states where the attractive force produced by the permanent magnets balances the weight of the suspended object and the electromagnet coil current converges to zero. This paper shows that parallel magnetic suspension systems incorporating zero-power control can assign the poles arbitrary if the original parallel suspension systems are controllable. The feasibility of the zero-power control in a parallel magnetic suspension is demonstrated experimentally.

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Vibration isolation system combining zero-power magnetic suspension with springs

Cited by 88 publications

References 21 publications

Vibration Isolation System Using Negative Stiffness

Vibration Isolation System Using Negative Stiffness

Development of Three-Axis Active Vibration Isolator Using Displacement Cancellation Technique

Zero-Power Control of Parallel Magnetic Suspension Systems

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