Uncertainty-based loads analysis for spacecraft

Calvi, Adriano; Klein, M.

doi:10.1016/b978-008044046-0.50546-7

Cited by 2 publications

(5 citation statements)

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“…where D(s) is the dynamic mass matrix [23], that is, the transfer matrix of the acceleration of the system and the external load D(s) can be expressed specifically as According to DMM, the disturbance load F b generated by the micro-vibration source in a blocked configuration is directly applied to the supporting structure [1,17]. In this case, F b causes the relative movement between the dynamic mass Dw of the micro-vibration source and the supporting structure, resulting in equal accelerations Ẍc at the coupled boundary, as shown in figure 1.…”

Section: Perception Of Dmm Based On Mechanical Impedance Theorymentioning

confidence: 99%

“…High-precision space missions place extremely high demands on the quiet on-orbit performance of spacecraft platforms [1]. However, there are numerous micro-vibration sources present on spacecraft, such as reaction wheels (RWs) used for attitude control, shutter mechanisms [2], cryocoolers, solar array drive mechanisms, etc [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, obtaining precise parameters through experimental means is challenging, making it difficult to effectively integrate with actual experimental measurement techniques. Subsequently, Elias et al [1,20,23] innovatively introduced the concept of dynamic mass into the analysis of coupled micro-vibration, providing a more convenient analytical framework for subsequent research. Unlike other sources, the dynamic mass of RWs varies with rotational speed due to the gyroscopic effect of their high-speed rotors, resulting in significant differences in coupled disturbance output characteristics compared to static conditions [24,25].…”

Section: Introductionmentioning

confidence: 99%

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Analytical method and experimental verification of coupled micro-vibration for spacecraft based on mechanical impedance theory

Chai,

Luo,

et al. 2024

Meas. Sci. Technol.

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Micro-vibrations bring up detrimental influence for spacecraft with extreme precision performance. Dynamic mass method (DMM) is a component level grounded micro-vibration measurement method, which is widely used in the analysis of coupled interplay between micro-vibration sources and spacecraft. However, this study reveals that all existing research involving DMM contains a fundamental error during its theoretical derivation. In light of this, the root cause of the error is investigated based on the mechanical impedance theory. Building upon this, a modified dynamic mass method (MDMM) is further proposed, and corresponding solution steps are also given, with emphasis on the treatment of gyroscopic effects of reaction wheels (RWs). To validate this analytical method, a grounded micro-vibration measurement system for RWs is designed and established. Micro-vibrations of a RW are measured under both the rigid-mounted and isolated conditions, respectively. Leveraging the physical parameters of the isolator, MDMM is applied to process the micro-vibration data measured under rigid-mounted condition, which predicts the transmitted data under isolated condition. The analytical data produced by MDMM agrees well with the measured results, which partially validates the feasibility and effectiveness of the proposed MDMM. This analytical method proposed in this work can serve as a theoretical tool for both measurement and analysis of the coupled micro-vibrations of sources and spacecraft.

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Section: Perception Of Dmm Based On Mechanical Impedance Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analytical method and experimental verification of coupled micro-vibration for spacecraft based on mechanical impedance theory

Chai,

Luo,

et al. 2024

Meas. Sci. Technol.

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“…), as well as shocks from its own pyrotechnics (spacecraft separation, solar array release and antenna deployment, etc.) [2][3][4][5]. It should be noted that the approaches to the rate making and adjustment of the on-boar equipment for shock inputs in Russia and abroad have significant differences.…”

Section: Research Questionmentioning

confidence: 99%

“…To date, the problems arising from the adjustment of on-board equipment for quasi-static and vibratory (both harmonic and random vibrations) loads have largely been solved [1][2][3][4][5][6]. One of the most complex types of mechanical loads on a spacecraft and on-board equipment where methodological problems remain are the increased intensity shock inputs.…”

Section: Research Questionmentioning

confidence: 99%

Rationing and shock testing on-board equipment of spacecrafts

Orlov

Матвеев

Rastorguev

2017

J. Phys.: Conf. Ser.

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Abstract. The article addresses the issues of valuation and testing of on-board equipment for high-intensity shocks, discusses the problems of various shock testing facilities use and compares approaches to the problem in our country and abroad. The decision to use the specific mechanical test facilities for the on-board equipment testing is taken by its developer based on the assessment of on-board equipment resistance to the impact (resulting from own experience and numerical modeling). IntroductionCurrently, both Russian and foreign spacecrafts are produced in accordance with unpressurized scheme. The power base of such spacecraft is cellular panels and composite materials structures. As a result, there are certain changes in the rigidity and damping properties of a spacecraft, the way in which the on-board equipment is attached and, consequently, the load on the spacecraft itself and the on-board equipment. At the same time, the existing normative documentation, which governs the loads on the on-board equipment and the adjustment methods, has remained virtually unchanged for more than 40 years [1].

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Uncertainty-based loads analysis for spacecraft

Cited by 2 publications

References 0 publications

Analytical method and experimental verification of coupled micro-vibration for spacecraft based on mechanical impedance theory

Analytical method and experimental verification of coupled micro-vibration for spacecraft based on mechanical impedance theory

Rationing and shock testing on-board equipment of spacecrafts

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