Satellite Vibration Testing: Angle optimisation method to Reduce Overtesting

Knight, Charly; Remedia, Marcello; Aglietti, Guglielmo S.; Richardson, Guy

doi:10.1016/j.actaastro.2018.04.004

Cited by 8 publications

(4 citation statements)

References 14 publications

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“…In the years since its introduction, a large body of literature has been produced for this structure (Rohe et al, 2018). This thesis's proposed method is an impedance modification approach and builds upon a recent study that utilized one single-axis shaker table and one test, called the Angle Optimization method (Knight et al, 2018). This study proposed a method to test a component at an offset angle.…”

Section: One Of the Most Productive Branches Of Impedance Modificatio...mentioning

confidence: 99%

“…The angle optimization study showed that a single-axis vibration test of a satellite system was able to adequately match the maximum RMS values for the coupled system tests with only one test at an optimized offset angle (Knight et al, 2018). This thesis's proposed method builds upon the optimized offset angle approach by also dynamically optimizing the test fixture stiffness.…”

Section: One Of the Most Productive Branches Of Impedance Modificatio...mentioning

confidence: 99%

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Rapid, Approximate Multi-axis Vibration Testing

Cramer,

Harvey,

Zhang

2023

Conference Proceedings of the Society for Experimental Mechanics Series

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Thesis Prepared for the Degree of MASTER OF SCIENCE UNIVERSITY OF NORTH TEXAS May 2023 Cramer, Ethan Savoy. Rapid, Approximate Multi-Axis Vibration Testing. Master of Science (Mechanical and Energy Engineering), May 2023, 43 pp., 9 tables, 23 figures, 41 numbered references.Sequential single-axis vibration testing strategies often produce over-testing when qualifying system hardware. Multi-axis excitation techniques can simulate realistic service environments, but the hardware and testing strategies needed to do so tend to be costly and complex. Test engineers instead must execute sequential tests on singleaxis shaker tables to excite each degree of freedom, which the previous two decades of vibration testing literature have shown to cause extensive over-testing when considering cross-axis responses in assessing the severity of the applied test environments.Traditional assessments assume that the test article responds only in the axis of excitation, but often significant response occurs in the off-axes as well. This paper proposes a method to address the over-testing problem by approximating a simultaneous multi-axis test using readily-available, single-axis shaker tables. By optimizing the angle of excitation and the boundary condition through dynamic test fixture design, the test article can be tested using a Single-Input, Multiple-Output (SIMO) test in a way that approximates a Multiple-Input, Multiple-Output (MIMO) test. This paper shows the proposed method in simulation with a 2D finite element box assembly with removable component (BARC) model attached to springs with variable stiffness.The results include quantified test quality assessment metrics with comparison to standard sequential testing. The proposed method enables access to rapid, approximate, multi-axis testing using existing hardware, thereby reducing the overconservatism of sequential single-axis tests and requisite over-design of systems.

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Section: One Of the Most Productive Branches Of Impedance Modificatio...mentioning

confidence: 99%

Section: One Of the Most Productive Branches Of Impedance Modificatio...mentioning

confidence: 99%

Rapid, Approximate Multi-axis Vibration Testing

Cramer,

Harvey,

Zhang

2023

Conference Proceedings of the Society for Experimental Mechanics Series

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“…In many fields such as communication, navigation, environmental monitoring, geological exploration, surveying and mapping, satellites occupy an indispensable position [1][2][3]. However, satellites must withstand a complex vibration environment [4][5][6] transmitted from the satellite-rocket interface during the launch process, including low-frequency vibrations and high-frequency random vibrations. The highfrequency random vibrations are mainly generated by noise excitation.…”

Section: Introductionmentioning

confidence: 99%

Design, analysis and experimental investigation on the whole-spacecraft vibration isolation platform with magnetorheological dampers

Cheng

Xing²,

Chen

et al. 2019

Smart Mater. Struct.

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Satellites are subject to complex loads during launch, and harsh vibration environments often result in failures in launching satellites or damage to on-board instruments. A six-degree-offreedom conical vibration isolation platform with magnetorheological dampers has been proposed, which is highly integrated and used to partially replace the original connection device to improve the vibration environment. A mathematical model of the vibration isolation platform with rigid payload is established and natural frequencies are solved. On the other hand, a dynamic model of the vibration isolation system including the flexible satellite is established by using dynamic software, and modal analysis and vibration analysis are carried out. The first six natural frequencies of the system obtained by simulation are close to the results of the model solution. Finally, the test platform is built and the ground vibration tests are conducted, and a well-known semi-active control approach called Skyhook is implemented. The test results are in good agreement with the simulation results of the vibration analysis, and the designed vibration isolation system has much better vibration isolation performance than the original system.

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“…This necessitates research in the field of design and modeling of relevant elements, as well as the development of methods for their calculation. In the theory of vibration reliability, it is relevant to conduct bench mechanical tests of components and assemblies of newly created construc tion [1], transport [2], aviation [3] and space [4] equipment.…”

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confidence: 99%

Characteristics of elasticity, frequency, and stability of plate connecting assemblies for vibrating machines

Shpachuk,

Chuprynin,

Suprun

2024

Nauk. visn. nat. hirn. univ.

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Characteristics of elasticity, frequency, and stability of plate connecting assemblies for vibrating machines Print EmailUser Rating: / 0 PoorBest Category: Content №2 2024 Last Updated on 01 May 2024 Published on 30 November -0001 Hits: 4 SocButtons v1.4 Authors: V.P.Shpachuk*, orcid.org/0000-0002-1714-8648, O.M.Beketov National University of Urban Economy in Kharkiv, Kharkiv, Ukraine, e-mail: v.p.shpachuk@gmail.com O.O.Chuprynin, orcid.org/0000-0002-8757-559X, O.M.Beketov National University of Urban Economy in Kharkiv, Kharkiv, Ukraine, e-mail: sasha.chupr@gmail.com T.O.Suprun, orcid.org/0000-0002-9666-5909, O.M.Beketov National University of Urban Economy in Kharkiv, Kharkiv, Ukraine, e-mail: ms.suprun1989@gmail.com * Corresponding author e-mail: v.p.shpachuk@gmail.com повний текст / full article Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2024, (2): 082 - 087 https://doi.org/10.33271/nvngu/2024-2/082 Abstract: Purpose. To formalize the design of the elastic element of the connection unit of a multi-axis vibrating machine with a plate, in the form of internal cutouts and autonomous jumpers. To obtain the dependence of the stiffness of the plate elastic element in the direction of transmitted vibration on the modulus of elasticity of the plate material, the cross-sectional area of an individual lintel, its length, width, and thickness. To determine the limiting values of the forcing forces of the machine that satisfy the stability conditions of the jumpers of the plate package according to Euler. Methodology. When creating the configuration of an elastic element in the form of longitudinal bridges of an even number and modeling the stiffness characteristic of the joint, the methods of applied mechanics and the theory of material resistance were used. Findings. The basic results of the work include mathematical and physical modeling of the characteristics of elasticity, stability, and mutual influences in the working and combined directions in relation to the connection points of multi-coordinate vibration machines, which are implemented through flat multi-section plate elements. Taken together, this makes it possible to create energy-efficient vibration machines, to increase the accuracy of the program movement of their working body, which in turn increases: the productivity of mining equipment – in the extraction of minerals, and their reliability – in the case of mechanical tests. Originality. It consists of the fact that for the first time the dependence of the stiffness of the plate elastic element in the direction of transmitted vibration on the modulus of elasticity of the plate material, the cross-sectional area of an individual lintel, its length, width, and thickness were obtained. It is shown that the stiffness of the plate in the conjugate direction is directly proportional to the material’s modulus of elasticity, the width of the lintel, its thickness cubed, and is inversely proportional to the length of the lintel in the third degree. It is established that in order to ensure the stability conditions of the lintels of the plate package with respect to the limiting values of the forces of the vibration exciters of the machine, there is their directly proportional dependence on the number of plates in the package, the modulus of elasticity of the material, the width of the lintel and the thickness of the plate in the third degree, and is inversely proportional to the length of the jumper in the square. Practical value. For the first time, a structural mechanical model of an elastic element has been proposed, represented by a plate divided by internal straight slots into external and internal lintels identical in width and length. A real plate connection unit has been created, and its experimental stiffness characteristics depending on the number of plates in the package are given.

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Satellite Vibration Testing: Angle optimisation method to Reduce Overtesting

Cited by 8 publications

References 14 publications

Rapid, Approximate Multi-axis Vibration Testing

Rapid, Approximate Multi-axis Vibration Testing

Design, analysis and experimental investigation on the whole-spacecraft vibration isolation platform with magnetorheological dampers

Characteristics of elasticity, frequency, and stability of plate connecting assemblies for vibrating machines

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