Vibro-acoustic response of spacecraft instrument subjected to diffuse sound field: Numerical simulations and experimental verification

Rarata, Zbigniew; Dacko, A.; Barciński, Tomasz; Polak, Szymon; Musiał, Jacek; Kubacki, Sławomir; Kowalski, Tomasz; Sikorski, Adam; Baran, Jędrzej

doi:10.1016/j.apacoust.2021.108338

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…The exact shape and size of used VHs, ribs location (which creates air pockets) and additional air-volume near filters can be estimated using design optimization techniques with acoustic numerical simulations. 12 It is important to point out that is that the SPL recorded near the filters is amplified by the A-DM structure with respect to control signal at frequencies below 60-100 Hz. This effect can be reduced only by big changes in the structure (e.g., closing the baffle and seal under baffle).…”

Section: Test Results Summarymentioning

confidence: 99%

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Design and acoustic tests of the ATHENA WFI filter wheel assembly development model towards TRL5

Polak

Musiał

Pietrzak

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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The filter wheel (FW) assembly (FWA), developed by the CBK Institute, is one of the critical subsystems of the wide field imager (WFI) instrument on board the Advanced Telescope for High Energy Astrophysics-mission of the ESA Cosmic Vision 2015-25 space science program (launch scheduled around 2035). The instrument has to collect soft x-rays with very high quantum efficiency, thus WFI requires extremely thin optical blocking filter (OBF). Due to its thickness (∼150 nm) and large area (∼170 mm × 170 mm) needed to achieve a 40 0 × 40 0 instrument field of view, the filter is extremely vulnerable to acoustic loads generated during Ariane 6 rocket launch. On the other side, FW mechanism has to provide high overall reliability, so it is more favourable to launch the instrument in atmospheric pressure (without vacuum enclosure for filter protection). Design efforts of the FW subsystem were focused on two issues: providing maximal possible sound pressure level suppression and smallest possible differential pressure across the OBF, which should prevent filters from damaging. We describe the design of a reconfigurable acoustic-demonstrator model (DM) of WFI FWA created for purposes of acoustic testing. Also, the acoustic test campaign is described: test methodology, test criteria, and results discussion and its implication on future FWA design. In general, tests conducted with the FWA DM showed that current design of WFI is feasible and the project can be continued without introducing a vacuum enclosure, which would significantly increase system complexity and mass.

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Section: Test Results Summarymentioning

confidence: 99%

“…The three last design variables should be all implemented in the next FWA design iterations. The exact shape and size of used VHs, ribs location (which creates air pockets) and additional air-volume near filters can be estimated using design optimization techniques with acoustic numerical simulations 12 …”

Section: Discussionmentioning

confidence: 99%

Design and acoustic tests of the ATHENA WFI filter wheel assembly development model towards TRL5

Polak

Musiał

Pietrzak

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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“…Numerical simulation with finite element (FE) modeling has demonstrated its remarkable efficiency in tackling dynamic problems of complex structures 37 , 38 . It offers substantial cost savings in the design phase as compared to laboratory testing.…”

Section: Introductionmentioning

confidence: 99%

Damping contribution of viscoelastic core on airborne sound insulation performance of finite constrained layer damping panels at low and middle frequencies

Wang,

Min

2023

Sci Rep

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The airborne sound insulation performance of finite sandwich panels is often significantly worsened by resonant transmission components in low and middle frequencies. In this paper, damping contribution of viscoelastic core on sound transmission loss (STL) of finite constrained layer damping (CLD) panels is studied in narrow frequency bands. A fully coupled layer-wise approach is used with a generalized high-order shear deformation hypothesis that accounts for all types of deformations in the core. The influence of several parameters is investigated extensively. Results show that the adverse impact of the first-three odd-odd order modes, namely (1,1), (3,1), and (1,3) modes, as well as some higher-order modes on STL cannot be disregarded. The constrained viscoelastic core plays a crucial role in enhancing, or even eliminating, dips of STL spectrum at resonant frequencies. Additionally, it can considerably counterbalance a relatively broadband reduction of STL caused by the inter-modal coupling in middle frequencies. The damping mechanism can be divided into two aspects: (i) the reduction of modal amplitude by vibration energy dissipation, and (ii) the change of bending modal shapes. CLD treatment is a concise and effective way to achieve stable sound insulation performance.

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The wide field imager for the NewAthena mission: preliminary design and verification

Antonelli,

Pietschner,

Strecker

et al. 2024

Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray

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The Wide Field Imager (WFI) is one of two focal plane instruments for NewAthena, ESA's next large X-ray observatory, planned for launch in 2037. It will study the growth mechanisms of supermassive black holes, the origin of their violent outflows and their impact on the evolution of their hosting galaxies, and the processes that lead to the assembly of luminous matter into the cosmic web [1]. WFI is a Si-based detector using DEPFET Active Pixel Sensor (APS) technology designed for sensitive wide-field imaging, spectroscopy, and high-count capability. The instrument's focal plane consists of a Large Detector Array (LDA) composed of four sensors with 512x512 pixels each and a smaller Fast Detector (FD) with 64x64 pixels, optimised for high-count rate applications.The WFI instrument had its System Requirements Review in 2022, after which the Athena mission underwent a designto-cost exercise to reduce the estimated Cost-at-Completion to restart the mission with a Delta Phase A-B from 2024. In the meantime, the WFI design has continued its development, including the verification of the most critical aspects to improve the maturity of the technologies used. This paper presents WFI's preliminary design based on its structural, thermal, and functional requirements. It includes the results of the numerical and experimental activities aiming at design verification and demonstration of technology readiness.

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Vibro-acoustic response of spacecraft instrument subjected to diffuse sound field: Numerical simulations and experimental verification

Cited by 3 publications

References 23 publications

Design and acoustic tests of the ATHENA WFI filter wheel assembly development model towards TRL5

Design and acoustic tests of the ATHENA WFI filter wheel assembly development model towards TRL5

Damping contribution of viscoelastic core on airborne sound insulation performance of finite constrained layer damping panels at low and middle frequencies

The wide field imager for the NewAthena mission: preliminary design and verification

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