排序方式: 共有6条查询结果,搜索用时 5 毫秒
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针对金属薄板冲压成形过程中成形力在板料与模具之间传递的关系,提出一种不同类型网格之间的载荷映射计算方法.该方法通过映射单元的精确定位,在板料壳单元与模具实体的四面体单元之间建立了一种对应关系,构建板料单元节点上的成形力与模具网格之间载荷映射的关系模型,从而得到模具表面精确的载荷分布.实例研究将该方法应用于模具结构的优化... 相似文献
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The detection on tetracycline( TC) in drinking water poses an environmental issue since TC has been widely used to prevent animal disease and promote their growth. In addition,TC was difficult to remove or biodegrade,which posed a challenge to the conventional techniques. In this work,the batch experiments on TC adsorption in aqueous solution of hydrogel( HG) consisting of graphene oxide( GO) and TiO_2 nanotubes( TN) were successfully conducted. HG composite( HG-TN-GO) was prepared with TN and GO with self-assembly method during the oxidation-reduction reaction,and criogel( CG) with TN and GO was characterized by pH at point of zero charge( pH_(pzc)), transmission electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy( XPS). The adsorption capacity of HG-TN-GO on TC was evaluated by analyzing its isotherms. The maximum adsorption capacity reached 751. 3 mg/g. Besides,the adsorption isotherms were well fitted by the Langmuir model, with the theoretical maximum( q_m) of 797. 0 mg/g. The adsorption process was systematically studied by varying pH during the whole adsorption process. The adsorption occurred probably via π-π interaction and cation-π bonding between TC and the HG-TN-GO surface. The composite could be regenerated in 50% ethanol aqueous solution,without significant capacity loss. After 6 recycles,the decrease of adsorption capacity was less than 10%. 相似文献
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树脂吸附法处理1,2—重氮氧基萘—4—磺酸生产酸析母液废水的研究 总被引:10,自引:0,他引:10
研究了树脂吸附法处理1,2-重氮氧基萘-4-磺酸生产酸析母液废水,考察了树脂吸附脱附性能的影响因素,并确定了最佳工艺参数。结果表明,NDA-409树脂对1,2,4-酸氧体生产酸析母液废水的吸附脱附效果良好。原废水呈深黑色,其中1,2,4-酸氧体浓度为8000-9000mg/L,CODcr浓度为10000-11000mg/L左右,处理后的出水无色透明,1,2,4-酸氧体浓度约为85mg/L,氧体去除率达99%,CODcr浓度小于100mg/L,CODcr去除率达99%;采用组合脱附剂对树脂进行洗脱再生,1,2,4-酸氧体的脱附率能稳定在99%以上。经过12批次小试稳定性实验和四批次放大实验证明,NDA-409树脂对1,2,4-酸氧体的吸附-脱附性能稳定。该工艺简单,操作方便,技术先进,不仅能有效地处理废水,使其实现达标排放,而且能回收废水中宝贵的化工原料,实现环境效益、社会效益和经济效益的统一,是一项具有推广价值的废水治理技术。 相似文献
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柔性智能桁架结构振动的主动控制方法实验研究 总被引:1,自引:0,他引:1
在只获得加速度的情况下,针对空间柔性智能桁架结构,进行了主动控制方法时仿真实验。实验通过加速度传感器测量加速度,建立了有信号调理、模数转换和微机实时测控的实时计算机控制系统。通过扫频激励进行了实时控制实验,给出了控制前后节点30y方向的固有频率和阻尼比的变化情况及控制某一阶模态时被控模态响应曲线。验证了采用独立模态空间控制方法设计的空间柔性智能桁架结构振动主动控制规律的实用性。实验结果表明该控制使被控模态阻尼比增加,频响函数的幅值衰减减较大,有较明显的控制效果。 相似文献
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