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冲击地压巷道液压支架恒阻吸能构件及其防冲性能研究

Study on constant-resistance energy-absorbing components of hydraulic support for rock burst roadway and their anti-impact performance

  • 摘要: 承载力存在较大的波动是薄壁折纹防冲吸能构件亟待解决的难点,针对承载力波动问题,分析现有折纹类型防冲吸能构件的共性问题及影响因素,设计了一种点阵式薄壁折纹防冲吸能构件并对其防冲性能开展优化研究。通过数值模拟方法研究了折纹结构特性、点阵单元体数量和壁厚等参数条件下承载力、应力分布和能量演化规律,分析构件防冲吸能特性。构建承载力波动系数优化目标函数,提出Matlab、Python和Abaqus之间相互协同计算的恒阻性能优化方法。结果表明:折纹结构特性对防冲吸能构件具有显著影响,随着折纹凹凸比增加,构件的承载力峰值、平均承载力减小,承载力波动系数先减小后增大。随着点阵单元体个数增大,防冲吸能构件的承载力峰值增大。点阵单元体更容易堆积造成大幅度的弯曲变形,承载力波动系数变大;构件的高度变小,让位位移行程变小,吸能量变小。防冲吸能构件的承载力和吸能量随壁厚的增加呈线性增加趋势。厚度增大,防冲吸能构件让位位移无明显变化,承载力呈缓慢上升趋势,波动系数变大。优化得出防冲吸能构件恒阻性能参数,在同一内径宽度下,随着防冲吸能构件的宽度增大,承载力峰值和承载力波动系数先减小后增大,平均承载力先减小后逐渐趋于平稳。

     

    Abstract: The significant fluctuation in bearing capacity remains a critical challenge to be addressed in thin-walled corrugated anti-impact energy-absorbing components. This study focuses on mitigating bearing capacity fluctuations by analyzing common issues and influencing factors in existing corrugated anti-impact energy-absorbing components. A lattice-type thin-walled corrugated anti-impact energy-absorbing component is designed, with optimization research conducted on its anti-impact performance.Through numerical simulation methods, this study investigates bearing capacity, stress distribution, and energy evolution patterns under parameters including corrugation structural characteristics, number of lattice unit cells, and wall thickness. An optimization objective function for the bearing capacity fluctuation coefficient is established, and a collaborative computational approach integrating MATLAB, Python, and Abaqus is proposed to optimize constant-resistance performance.The research results demonstrate:Corrugation structural characteristics significantly influence anti-impact performance. As the corrugation convexity-concavity ratio increases, both the peak bearing capacity and average bearing capacity decrease, while the bearing capacity fluctuation coefficient initially decreases and subsequently increases.Increasing the number of lattice unit cells elevates the peak bearing capacity. However, excessive unit cells promote stacking-induced large bending deformations, increasing the fluctuation coefficient. Reduced component height shortens the yield displacement stroke, diminishing energy absorption.Bearing capacity and energy absorption exhibit a linear increasing trend with wall thickness. Increased thickness negligibly affects yield displacement but gradually elevates bearing capacity, accompanied by a higher fluctuation coefficient.Optimized constant-resistance parameters reveal that under constant inner diameter width: increasing component width causes the peak bearing capacity and fluctuation coefficient to first decrease then increase, while the average bearing capacity initially decreases before gradually stabilizing.

     

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