Hubble Space Telescope Pointing Performance Due to Micro-Dynamic Disturbances from the NICMOS Cryogenic Cooler

Clapp, Brian; Sills, Joel; Voorhees, C. R.

doi:10.2514/6.2002-1249

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…In order to get an ultra-high-resolution image, many disturbances that affect the performance of the sensitive payload need to be controlled on board. e most annoying disturbance that degrades the performance of payload is thermal deflection [1,2] of satellite structure and microvibration ejected by moving parts such as cryocooler [3][4][5], flywheel [6,7], and control moment gyroscope (CMG) [8]. As a matter of fact, CMGs are widely used in fast maneuver satellites because of their significant angular momentum.…”

Section: Introductionmentioning

confidence: 99%

Benefit of Relaxation‐Type Damping on the Performance of a Six‐Degree‐of‐Freedom Microvibration Isolation Device for Control Moment Gyroscope

Liu

Shao

Zhou

et al. 2021

Shock and Vibration

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In order to provide an ultraquiet environment for spacecraft payload, a six-degree-of-freedom microvibration isolation device for satellite control moment gyro (CMG) is proposed in this paper. The dynamic characteristics of the microvibration isolation device are analyzed theoretically and experimentally. The dynamic equations of the microvibration suppression device are established by using the Newton–Euler method. The dynamic responses are numerically solved and the frequency-domain characteristics of the microvibration isolation device under base excitation are analyzed. The analytical results are first verified numerically, and the two results are in good accordance. The experimental apparatus is built, and the vibration isolation performance is investigated. The acceleration transfer function is measured and the influence of the excitation amplitude on the vibration isolation performance is performed. It is shown that the amplification factor at the vicinity of the resonance frequency is within 10 dB, and the vibration isolation performance is significant at higher frequencies. The vibration attenuation performance at the main frequency of the CMG (100 Hz) is more than 30 dB. The microvibration suppression device can effectively suppress the microvibration generated by CMG during orbital operation.

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Section: Introductionmentioning

confidence: 99%

Benefit of Relaxation‐Type Damping on the Performance of a Six‐Degree‐of‐Freedom Microvibration Isolation Device for Control Moment Gyroscope

Liu

Shao

Zhou

et al. 2021

Shock and Vibration

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show abstract

“…Mission components are supported softly to avoid the resonant response (Belvin et al, 1995) (Clapp, et al, 2002) (Bronowicki, 2006). The disturbance sources are also supported softly to reduce the excitation force transmissibility (Oh, et al, 2013).…”

Section: -1) Base Isolationmentioning

confidence: 99%

Microvibration in spacecraft

Komatsu

Uchida

2014

Mechanical Engineering Reviews

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The limitation of technology to estimate the on-orbit microvibration of a spacecraft is shown in this review paper. At present, the mechanical engineering ability cannot meet the mission requirements and the configuration of the pre-flight ground tests is far from the on-orbit configuration from the microvibration point of view. It is also extremely difficult to correlate the mathematical dynamical model (Finite Element Model (FEM)) exactly to test data up to the mid-frequency range where microvibration can be problematic even if considerable manpower is committed to analyze the correlation. Accordingly, a safety factor of at least single digit range must be introduced as part of disturbance control management.

show abstract

Hubble Space Telescope Pointing Performance Due to Micro-Dynamic Disturbances from the NICMOS Cryogenic Cooler

Cited by 2 publications

References 2 publications

Benefit of Relaxation‐Type Damping on the Performance of a Six‐Degree‐of‐Freedom Microvibration Isolation Device for Control Moment Gyroscope

Benefit of Relaxation‐Type Damping on the Performance of a Six‐Degree‐of‐Freedom Microvibration Isolation Device for Control Moment Gyroscope

Microvibration in spacecraft

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