<p>Spacecraft electronic equipment are subjected to very severe vibrational mechanical field during the launcher ascent lift-off phase. Within the first <InlineEquation ID="IEq1"> <EquationSource Format="TEX">$120-150$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>120</mn> <mo>-</mo> <mn>150</mn> </mrow> </math></EquationSource> </InlineEquation> s, all satellite assemblies and sub-assemblies face the <InlineEquation ID="IEq2"> <EquationSource Format="TEX">$95\%$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>95</mn> <mo>%</mo> </mrow> </math></EquationSource> </InlineEquation> of their entire mechanical life. The main aim of this paper is to focus on mechanical device for vibrations reduction in order to increase the electronic components dependability and to avoid the partial or total service interruption. In particular, passive tuned mass dampers have been studied and optimized to suppress unwanted dynamic response at circuitry level. The first part of the paper will introduce the topic including a general overview about the available solutions on the market. This section will be followed by a theoretical section where the main governing equations will be introduced and discussed to define the functioning principle. Basing on the understanding of the governing equations, a sensitivity analysis will be performed to identify the design parameters to be considered in a dedicated optimization process. The main goal is to define a set of practice rules to be used during the space equipment design to control, to reduce and, in some cases, to suppress the vibrational field that may affects the electrical, electronic and electro-mechanical parts reliability <i>(f.i.</i> crystal oscillators, relays, etc<InlineEquation ID="IEq3"> <EquationSource Format="TEX">$\dots$</EquationSource> <EquationSource Format="MATHML"><math> <mo>⋯</mo> </math></EquationSource> </InlineEquation>) by jeopardizing the hardware nominal functioning. In the second section, the so obtained set of design parameters will be used for a practice application. A simple sub-system will be introduced and an optimal tuned mass damper will be identified to reduce the dynamic response when subjected to a vibrating field. Relevant numerical simulations will be presented to identify and to properly size the passive device. The numerical simulation results will find confirmation in the latter section, the third one. In this conclusive paragraph, the experimental data about the optimal solution will be presented and discussed by giving evidence of the positive effect of the identified device with respect to electronics mechanical reliability.</p>

Space Circuitry Tunable Mass Damper Design Parameters Sensitivity Analysis

期刊论文
发表日期：

2025年8月18日

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Riccardo Monti,
M. Laurenzi,
M. Tozzi,
M. Salvadei,
W. D’Ambrogio,
J. Brunetti

摘要

Spacecraft electronic equipment are subjected to very severe vibrational mechanical field during the launcher ascent lift-off phase. Within the first $120-150$ $120 - 150$ s, all satellite assemblies and sub-assemblies face the $95\%$ $95 %$ of their entire mechanical life. The main aim of this paper is to focus on mechanical device for vibrations reduction in order to increase the electronic components dependability and to avoid the partial or total service interruption. In particular, passive tuned mass dampers have been studied and optimized to suppress unwanted dynamic response at circuitry level. The first part of the paper will introduce the topic including a general overview about the available solutions on the market. This section will be followed by a theoretical section where the main governing equations will be introduced and discussed to define the functioning principle. Basing on the understanding of the governing equations, a sensitivity analysis will be performed to identify the design parameters to be considered in a dedicated optimization process. The main goal is to define a set of practice rules to be used during the space equipment design to control, to reduce and, in some cases, to suppress the vibrational field that may affects the electrical, electronic and electro-mechanical parts reliability (f.i. crystal oscillators, relays, etc $\dots$ $\dots$ ) by jeopardizing the hardware nominal functioning. In the second section, the so obtained set of design parameters will be used for a practice application. A simple sub-system will be introduced and an optimal tuned mass damper will be identified to reduce the dynamic response when subjected to a vibrating field. Relevant numerical simulations will be presented to identify and to properly size the passive device. The numerical simulation results will find confirmation in the latter section, the third one. In this conclusive paragraph, the experimental data about the optimal solution will be presented and discussed by giving evidence of the positive effect of the identified device with respect to electronics mechanical reliability.