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Structural dynamic fail-safe topology optimization design based on adaptive bubble method

Li, Shun Cai, Shouyu Wei, Hongtao Xu, Wentao Duan, Delu

School of Mechanics and Safety Engineering Zhengzhou University Zhengzhou 450001 China

关键词： adaptive bubble method (ABM) dynamic compliance fail-safe natural frequency topology optimization

摘要： Here, to overcome the deficiency of extreme sensitivity to local damages under Vibration load due to lack of redundant structures in dynamic topology optimization design results, combining the adaptive bubble method (ABM) and fail-safe design concept, a structural dynamic fail-safe topology optimization design framework was developed. Compared with traditional topology optimization methods of variable density method and level set method, the ABM could not only have advantages of fewer design variables, smooth and clear optimization result boundary and being directly imported into CAD Systems, but also effectively avoid local modal phenomena caused by weak elements in dynamic topology optimization. The concept of fail-safe design had already been introduced in static topology optimization design to avoid overall structural failure caused by local damages, but it had not been used to solve the more common Vibration failure problem in engineering. Here, the concept of fail-safe design was extended to dynamic topology optimization design by combining the ABM. Firstly, a universal hole-inducing criterion was adopted to realize structural dynamic topology optimization based on the ABM. Then, comprehensively considering various damage conditions, local structural damage was simulated by removing materials from different areas. Furthermore, Kreisselmeier-Steinhauser (KS) function was used to condense fundamental frequencies or dynamic compliances of structure under all damage conditions, which was taken as the optimization objective. Finally, the structural dynamic topology optimization model considering fail-safe was established to perform optimization design based on sensitivity analysis results. The effectiveness of this method in improving structural Vibration safety was verified with two representative examples. © 2025 Chinese Vibration Engineering Society. All rights reserved.

Metal meta-structure vibration reduction bracket design for ship pipelines in extreme high/low temperature environment

Wang, Ruiguo Yang, Deqing Liu, Xi'an

State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai 200240 ChinaYazhou Bay Institute of Deepsea Science and Technology Shanghai Jiao Tong University Sanya 572024 ChinaShanghai Suochen Information Technology Ltd. Shanghai 201204 China

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关键词： band gap Finite element analysis Pipeline support vibration control

摘要： Some pipelines in LNG and nuclear power ships work in ultra-low temperature or high temperature environments, and the existing rubber, plastic, and hydraulic vibration-damping brackets are difficult to function due to low-temperature brittleness, high-temperature softening, high-temperature aging, and freezing of hydraulic oil. Based on the theory of metamaterials to design a class of pipeline metal vibration damping bracket suitable for high and low temperature environment to solve this engineering problem. [Methods] The metamaterial vibration damping bracket contains specially designed star cell elements, low frequency and wide frequency band vibration damping performance through the anti-phase force self-generation effect and band gap characteristics, by adjusting the number of cell element ring sequence to adapt to different types of pipelines and load bearing performance, and its parent material is low temperature steel to adapt to the high and low temperature working environment. The energy band structure of the metamaterial cell element is calculated by the finite element method, and the load bearing performance and vibration isolation effect of the metamaterial bracket of different pipe diameters when mounted on the plate frame are compared and analyzed. [Results] According to the finite element calculation results, the total vibration level difference of different metal brackets for three pipe diameters in the frequency band below 250Hz is kept above 20dB. [Conclusions] The vibration damping bracket design example shows that this design bracket can realize the ultra-low frequency and wide band vibration suppression of ship pipeline while maintaining the bearing performance, which provides reference for the vibration damping design of ship under high and low temperature extreme environment. © 2025 Chinese Vibration Engineering Society. All rights reserved.

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