微机控制型砂紧实率的数学模型

分析了影响型砂紧实率控制精度的因素 ,建立了型砂紧实率 -水分回归系数的动态模型 .为防止型砂水分不足或过量 ,将第一次加水量设定为总加水量的 80 % .第一次加水后 ,对型砂紧实率稳定值采用AR模型进行预测 ,以缩短型砂混制时间 .每次加水后 ,引入修正系数 ,以适应型砂组成的变化 .实验表明 ,该数学模型不仅使型砂水分含量在较短时间内达到最佳范围 ,同时可指示对型砂组成进行调整 ,能较好地符合实际情况

The Mathematical Model of Microcomputer Control Sand Compactibility

This paper analyzes the factors affecting the controlling precision of sand compactibility system and sets up the dynamic model of regression coefficient between sand compactibility and water content.To prevent the insufficiency or excess of sand water content,the amount of the first addition is set as 80% of the total water addition amount.After the first water addition,we adopt AR model to predict the stable value of sand compactibility to shorten the time mixing the sand.Each time we add water,the correction coefficient is introduced to adapt to the change in the composition of sand.The experiment shows that the mathematics model not only makes the water content in sand reach the best range within shorter time,but also directs how the sand composition should be adjusted,which can better conform to the actual situation.