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金属颗粒填充桩锤锤击模型的数值分析

, PP. 122-126

Keywords: 机械工程,桩锤,状态空间法,锤击力,金属颗粒,接触刚度

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Abstract:

?为分析填充金属颗粒对打桩锤锤击力的影响,考虑填充金属颗粒的作用,用集中质量块表示填充的金属颗粒,用弹簧模拟金属颗粒与锤体相碰处的接触刚度,用不同的集中质量块表示桩锤、砧座和桩帽,用并联的弹簧、阻尼器表示锤垫,用弹簧表示桩垫,用阻尼器表示桩,建立了平衡方程。结合状态空间法,采用量纲一化计算方法分析了各参数对锤击力的影响,并对金属颗粒填充桩锤与普通桩锤产生的锤击力进行了比较。结果表明:在锤体内填充弹性模量小的材料制成的细金属颗粒,使桩锤产生的锤击力有效作用时间更长,能量传递效率更高。

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