为了提高水葫芦颗粒燃料的成型品质,该文对水葫芦颗粒燃料的致密成型工艺进行了试验研究,分析了加工压力、温度、原料含水率和粉碎粒度与水葫芦颗粒燃料的颗粒密度和径向抗压力的关系。单因素和多因素正交试验研究结果表明:影响水葫芦...为了提高水葫芦颗粒燃料的成型品质,该文对水葫芦颗粒燃料的致密成型工艺进行了试验研究,分析了加工压力、温度、原料含水率和粉碎粒度与水葫芦颗粒燃料的颗粒密度和径向抗压力的关系。单因素和多因素正交试验研究结果表明:影响水葫芦颗粒燃料的颗粒密度的主次工艺参数排序为:压力>粒度>温度>含水率;工艺参数温度、压力和粒度的对水葫芦颗粒燃料的径向抗压力的影响差别不大,而原料含水率的影响最小。水葫芦颗粒燃料的最佳工艺参数条件为:压力6 k N、温度100℃、含水率12%、粒度0.58 mm,在此最佳工艺参数条件下,水葫芦颗粒燃料的颗粒密度和径向抗压力可分别达到1 362.21 kg/m3和1.44 k N。研究结果为工业化生产高质量的水葫芦颗粒燃料提供理论依据。展开更多
Multi-objective optimization has been increasingly applied in engineering where optimal decisions need to be made in the presence of trade-offs between two or more objectives. Minimizing the volume of shrinkage porosi...Multi-objective optimization has been increasingly applied in engineering where optimal decisions need to be made in the presence of trade-offs between two or more objectives. Minimizing the volume of shrinkage porosity, while reducing the secondary dendritic arm spacing of a wheel casting during low-pressure die casting(LPDC) process, was taken as an example of such problem. A commercial simulation software Pro CASTTM was applied to simulate the filling and solidification processes. Additionally, a program for integrating the optimization algorithm with numerical simulation was developed based on SiPESC. By setting pouring temperature and filling pressure as design variables, shrinkage porosity and secondary dendritic arm spacing as objective variables, the multi-objective optimization of minimum volume of shrinkage porosity and secondary dendritic arm spacing was achieved. The optimal combination of AZ91 D wheel casting was: pouring temperature 689 °C and filling pressure 6.5 kPa. The predicted values decreased from 4.1% to 2.1% for shrinkage porosity, and 88.5 μm to 81.2 μm for the secondary dendritic arm spacing. The optimal results proved the feasibility of the developed program in multi-objective optimization.展开更多
文摘为了提高水葫芦颗粒燃料的成型品质,该文对水葫芦颗粒燃料的致密成型工艺进行了试验研究,分析了加工压力、温度、原料含水率和粉碎粒度与水葫芦颗粒燃料的颗粒密度和径向抗压力的关系。单因素和多因素正交试验研究结果表明:影响水葫芦颗粒燃料的颗粒密度的主次工艺参数排序为:压力>粒度>温度>含水率;工艺参数温度、压力和粒度的对水葫芦颗粒燃料的径向抗压力的影响差别不大,而原料含水率的影响最小。水葫芦颗粒燃料的最佳工艺参数条件为:压力6 k N、温度100℃、含水率12%、粒度0.58 mm,在此最佳工艺参数条件下,水葫芦颗粒燃料的颗粒密度和径向抗压力可分别达到1 362.21 kg/m3和1.44 k N。研究结果为工业化生产高质量的水葫芦颗粒燃料提供理论依据。
基金financially supported by the National Key Research and Development Program of China(Grant No.2016YFB0701204)
文摘Multi-objective optimization has been increasingly applied in engineering where optimal decisions need to be made in the presence of trade-offs between two or more objectives. Minimizing the volume of shrinkage porosity, while reducing the secondary dendritic arm spacing of a wheel casting during low-pressure die casting(LPDC) process, was taken as an example of such problem. A commercial simulation software Pro CASTTM was applied to simulate the filling and solidification processes. Additionally, a program for integrating the optimization algorithm with numerical simulation was developed based on SiPESC. By setting pouring temperature and filling pressure as design variables, shrinkage porosity and secondary dendritic arm spacing as objective variables, the multi-objective optimization of minimum volume of shrinkage porosity and secondary dendritic arm spacing was achieved. The optimal combination of AZ91 D wheel casting was: pouring temperature 689 °C and filling pressure 6.5 kPa. The predicted values decreased from 4.1% to 2.1% for shrinkage porosity, and 88.5 μm to 81.2 μm for the secondary dendritic arm spacing. The optimal results proved the feasibility of the developed program in multi-objective optimization.