Design and experiments of an active isolator for satellite micro-vibration

Li, Weipeng; Zhou, Xubin; Zheng, Xinqian; Bai, Yang

doi:10.1016/j.cja.2014.10.012

Cited by 23 publications

(5 citation statements)

References 28 publications

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“…However, it still has limitations similar to those of passive isolation. Active vibration isolation technology [ 11 , 12 , 13 , 14 ] can overcome the shortcomings of passive and semi-active isolation by effectively suppressing low-frequency vibrations. However, active isolation primarily focuses on low-frequency suppression.…”

Section: Introductionmentioning

confidence: 99%

Design and Experimental Study of a Hybrid Micro-Vibration Isolation System Based on a Strain Sensor for High-Precision Space Payloads

Guo,

Zhou,

et al. 2024

Sensors

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Micro-vibrations significantly influence the imaging quality and pointing accuracy of high-precision space-borne payloads. To mitigate this issue, vibration isolation technology must be employed to reduce the transmission of micro-vibrations to payloads. In this paper, a novel active–passive hybrid isolation (APHI) system based on a strain sensor is proposed for high-precision space payloads, and corresponding theoretical and experimental studies are implemented. First, a theoretical analysis model of the APHI system is established using a two-degrees-of-freedom system, and an integral control method based on strain sensing is presented. Then, an electromagnetic damper, active piezoelectric actuator, and strain sensor are designed and manufactured. Finally, an APHI experimental system is implemented to validate the effectiveness of electromagnetic damping and strain-sensing active control. Additionally, the control effects of acceleration, displacement, and strain sensors are compared. The results demonstrate that strain sensors can achieve effective active damping control, and the control method based on strain sensors can effectively suppress the payload response while maintaining stability. Both displacement and strain sensors exhibit superior suppression effects compared with the acceleration sensor, with the strain sensor showing greater potential for practical engineering applications than the displacement sensor.

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Section: Introductionmentioning

confidence: 99%

Design and Experimental Study of a Hybrid Micro-Vibration Isolation System Based on a Strain Sensor for High-Precision Space Payloads

Guo,

Zhou,

et al. 2024

Sensors

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“…Active isolation platforms typically have controllers and actuators, making them more complex than passive ones. As a result, they are typically only used to isolate effective payloads [31,32]. For instance, the Tacsat2 satellite launched by the United States in 2006 featured an active and passive combined isolation device installed on its camera [33].…”

Section: Introductionmentioning

confidence: 99%

Flywheel Vibration Isolation of Satellite Structure by Applying Structural Plates with Elastic Boundary Instead of Restrained Boundary

Kong,

Li,

Zhou

et al. 2023

Applied Sciences

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Flywheels play a critical role as core components in satellite attitude control systems. However, their high-speed rotation inevitably generates vibrations that have a detrimental impact on the in-orbit imaging capabilities of high-precision remote sensing payloads. This study focuses on the passive vibration isolation design of satellite flywheels. The flywheel-mounted structural plate and flywheel vibration isolation platform are considered as a whole system (termed a plate-isolator system). In this system, the structural plate is treated as an elastomer. By simplifying the plate-isolator system as a 2-degree-of-freedom vibration system, it becomes evident that obtaining an ideal vibration isolation effect through the optimization of the flywheel vibration isolation platform (FVIP) alone is difficult. In order to enhance the passive vibration isolation effect for satellite flywheels, this study introduces the concept of an elastic boundary applied to the flywheel-mounted structural plate, thus treating the elastic boundary as a design factor. Consequently, the plate-isolator system can be simplified as a 3-stage vibration isolation system. The optimization of the elastic boundary condition of the structural plate is performed using the kinetic model of the simplified 3-stage system. The vibration isolation effect of the plate-isolator system with an elastic boundary is further confirmed through finite element simulation. The calculation results demonstrate that, after establishing a reasonable elastic boundary for the satellite structural plate, the overall vibration/force transmission rate of the plate-isolator system becomes similar to that of a single-degree-of-freedom dynamic system. Finally, the proposed concept is validated through kinetic response analysis of a cube satellite. The results reveal that the vibration amplitude of the satellite’s top and side structural plates can be effectively lowered if the elastic boundary condition is set for the flywheel-mounted bottom structural plate.

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“…At present, the methods for isolating microvibration are mainly active vibration isolation and passive vibration isolation. Passive vibration isolation, although simple in structure and strong in reliability, has achieved certain vibration isolation effects limited in the relative high-frequency range, hence powerless for microvibration environments with low-frequency and complex disturbance sources [2][3][4][5][6][7][8]. e low-frequency microvibration in the space has a great influence on the accuracy of high-resolution pointing, the use of precision payload, and the accuracy of scientific experimental results of space stations [9].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Modeling and Active Vibration Isolation of a Noncontact 6‐DOF Lorentz Platform Based on the Exponential Convergence Disturbance Observer

Zhou

Chen

Zhao

et al. 2021

Shock and Vibration

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In order to study the vibration isolation and positioning performance of the noncontact 6-DOF platform in the space microgravity environment, this paper presented a cosimulation model of a virtual prototype. Based on the model driven by biaxial noncontact Lorentz force actuators (NLFAs), an equivalent dynamic model has been established. In the meanwhile, the 6-DOF sliding mode robust controller with exponential convergence disturbance observer is developed. The mechanical system simulation model was designed using ADAMS, and the corresponding 6-DOF decoupling control system and disturbance observer programs were developed using MATLAB/Simulink. According to the mechatronics simulation results, the system can enable the floating platform to achieve micron-level posture positioning within 0.5 s. In vibration isolation simulation, the disturbance observer can predict the external disturbance input and compensate the control force more accurately so that the floating platform can effectively suppress low-frequency disturbance and step disturbance under the control of the sliding mode controller. And the displacement of the floating platform under the disturbance of 1–100 Hz frequency sweep is less than 1 μm.

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Design and experiments of an active isolator for satellite micro-vibration

Cited by 23 publications

References 28 publications

Design and Experimental Study of a Hybrid Micro-Vibration Isolation System Based on a Strain Sensor for High-Precision Space Payloads

Design and Experimental Study of a Hybrid Micro-Vibration Isolation System Based on a Strain Sensor for High-Precision Space Payloads

Flywheel Vibration Isolation of Satellite Structure by Applying Structural Plates with Elastic Boundary Instead of Restrained Boundary

Dynamic Modeling and Active Vibration Isolation of a Noncontact 6‐DOF Lorentz Platform Based on the Exponential Convergence Disturbance Observer

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