Frequency-Domain Response Prediction of a Launch Vehicle Coupled with New Payloads

Piao, Si-Yang; Zhang, Yahui

doi:10.2514/1.a35047

Cited by 3 publications

(2 citation statements)

References 1 publication

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“…acting on the interface DoFs. Without considering damping for the time being, the motion equation of service system of lightweight structure can be written in the following block form [34]…”

Section: Inherent Rigid-flex Coupling Relation Of Hsrsmentioning

confidence: 99%

Multidiscipline design optimization for large-scale complex nonlinear dynamic system based on weak coupling interfaces

Piao

et al. 2023

Preprint

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For hi-tech manufacturing industries, developing large-scale complex nonlinear dynamic system must be taken as one of basic works, formulating problems to be solved, steering system design to a more preferable direction, and making correct strategic decisions. By using effective tools of big data mining, Dynamic Design Methodology was proposed to establish technical platform of Multidiscipline Design Optimization such as High Speed Rolling Stock, including three key technologies: i) Analysis graph of full-vehicle stability properties and variation patterns, providing instructive guidance on optimal parameter configuration of self-adaptive improved design for higher speed bogies to reduce track force; ii) Improved transaction strategy of flexible body to MBS interface, making boundary loading treatments more subtle to implement weak coupling interface of aluminium alloy car body to equipment cabin under floor frame; iii) Seamless collaboration with weldline fatigue damage assessments, ensuring structure integrity via correct Modal Stress Recovery. Steel rail profession unilaterally initiated improved design of wheel-rail relationship, which is proved to be unfavourable to commercial applications for Chinese High Speed Rails. On first fluttering phenomenon of service car body, contrastive analyses of line tracking tests and rigid-flex coupling simulations show that internal lateral coupling resonance of such as traction converter has been one of main restrictive factors that determine cost effectiveness. Whilst self-adaptive improved solution is one of more favourable options. Comprehensive evaluations show that only under rational conditions of wheel-rail matching, i.e. 0.10 ≥ λeN > λemin and λemin= (0.03–0.06), can this low cast solution achieve three goals of low track conicity, optimal route planning and investment benefit maximization.

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Section: Inherent Rigid-flex Coupling Relation Of Hsrsmentioning

confidence: 99%

Multidiscipline design optimization for large-scale complex nonlinear dynamic system based on weak coupling interfaces

Piao

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The displacement x o = X o e jωt on the interface DoFs, the displacement x i = X i e jωt on the internal DoFs, and the excitation load f o = F o e jωt acting on the interface DoFs. Without considering damping for the time being, the motion equation of the service system of a lightweight structure can be written in the following block form [34]:…”

Section: Inherent Rigid-flex Coupling Relation Of Hsrsmentioning

confidence: 99%

Multidiscipline Design Optimization for Large-Scale Complex Nonlinear Dynamic System Based on Weak Coupling Interfaces

Piao

et al. 2023

Applied Sciences

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For high-tech manufacturing industries, developing large-scale complex nonlinear dynamic systems must be taken as one of the basic works, formulating problems to be solved, steering system design in a more preferable direction, and making correct strategic decisions. By using effective tools of big data mining, Dynamic Design Methodology was proposed to establish a technical platform for Multidiscipline Design Optimization such as High-Speed Rolling Stock, including three key technologies: analysis graph of full-vehicle stability properties and variation patterns, improved transaction strategy of flexible body to MBS interface, seamless collaboration with weldline fatigue damage assessments through correct Modal Stress Recovery. By applying the above methodology, a self-adaptive improved solution was formulated with optimal parameter configuration, which is one of the more favorable options for higher-speed bogies. While within a velocity (140–200) km/h at λe < 0.10, car body instability’s influence on ride comfort can be easily improved by using a semi-active vibration reduction technique between inter-vehicles through outer windshields. Comprehensive evaluations show that only under rational conditions of wheel-rail matching, i.e., 0.10 ≥ λeN > λemin and λemin = (0.03–0.06), can this low-cost solution achieve the three goals of low track conicity, optimal route planning, and investment benefit maximization. So, rail vehicle experts are necessary to collaborate and innovate intensively with passenger transportation and steel rail ones. Specifically, by adopting rail grinding treatment, occurrence probability is controlled at 85% and 5% for track conicity of (0.03–0.10) and (0.25–0.35). By optimizing routing planning, operating across dedicated lines of different speed grades can achieve self-cleaning of central hollow tread wear over time. According to the inherent rigid-flex coupling relationship, geometric nonlinearities of worn wheel-rail contact should be avoided as much as possible for HSR practices. Only under weak coupling interfaces in the floor frame can the structural integrity of an aluminum alloy car body be ensured.

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Research on Lateral Vibration and Load Sensitivity Reductions for Large‐Scale Complex Nonconservative Systems Using Rigid‐Flex Coupling Simulation Technique

Wang,

Xu,

Piao

et al. 2024

Shock and Vibration

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For large‐scale complex nonconservative systems such as high‐speed rolling stock, the rigid‐flex coupling simulation technique is one of the effective methods in reducing lateral vibration and dynamic load sensitivity. Since two uncertain influences of wheel spin dissipation are caused by wheelset yaw oscillations and alternative load path variation due to nonstatically determined systems or redundant components/constraints, preliminary achievements of self‐adaptive improved design make wheel–rail matching returns to rational conditions, managing and maintaining better data integrity of high‐speed wheel–rail contact. A supporting platform was then established for multidisciplinary collaborative design optimization to scientifically promote the design speed, including inherent rigid‐flex coupling relationship and integrity protection of nonconservative systems and associated individual structures. Combined with analysis results of long‐term tracking online testing conclusions from Chinese practices of high‐speed rails, relevant theoretical deductions find that the magnitude of quasistatic strain energy is one of the critical influencing factors in determining the dynamic interactions on coupling interfaces of interest. With this regard, two key technologies were further put forward, i.e., rational eigenstructure assignment based on modal modification responding technique and multiaxial weld fatigue damage assessment tool based on the correctness of modal stress recovery, both of which have been examined and verified in specific case investigations.

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Frequency-Domain Response Prediction of a Launch Vehicle Coupled with New Payloads

Cited by 3 publications

References 1 publication

Multidiscipline design optimization for large-scale complex nonlinear dynamic system based on weak coupling interfaces

Multidiscipline design optimization for large-scale complex nonlinear dynamic system based on weak coupling interfaces

Multidiscipline Design Optimization for Large-Scale Complex Nonlinear Dynamic System Based on Weak Coupling Interfaces

Research on Lateral Vibration and Load Sensitivity Reductions for Large‐Scale Complex Nonconservative Systems Using Rigid‐Flex Coupling Simulation Technique

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