摘要
为了实现对青黄贮裹包饲料有氧变质的风险预测,针对破损青黄贮裹包饲料内部温度变化问题,以青黄贮黑麦草及青黄贮苜蓿为对象展开了研究。设计了特定的贯入仪,在不引入空气的情况下将温度传感器植入裹包饲料内,实现了监测裹包内特定位置温度变化的可操作化。采用两种方案分别对黑麦草裹包饲料与苜蓿裹包饲料内特定位置的温度进行监测,发现在裹包破损后,距离裹包破损口越近的饲料发生温升越早;对裹包内上部与下部相对应的温度检测值进行配对t检验,试验结果表明,破损裹包内与破损口距离相等但分处在裹包上部与下部对称的两点温升过程具有显著差异;分别对不同干物质含量的青黄贮苜蓿与黑麦草裹包饲料温升曲线进行对比,干物质含量较高的青黄贮裹包饲料较干物质含量低的温升快。制定了裹包内温度场分布数据的获取方案,并实现了温度场的可视化。
The deterioration risk of bale silage is relatively high because of a high surface-area to volume ratio. Therefore, the damages of plastic covers of bales should receive particular attention since it may often occur during removing or transportation process. When bales are punctured, oxygen is allowed to permeate the silage and subsequently aerobic organisms flourish and metabolize the products of fermentation, and the temperature inside the bales will rise up again. So temperature is a key indicator when the material is noticed to be ＂heating＂ since while oxygen comes into contact with the silage. In order to forecast the risks of aerobic deterioration of silage, grass bale silage and alfalfa bale silage were selected as study objects. The method which used to embed temperature sensors into the bale to measure the temperature was proposed. The self-developed multi-sensor experimental system with a specific penetration shaft and cone （V-structure） was used. While the cone penetrated into bale, the thermalcouple sensor followed the cone into the bale. If the cone arrived at the place desired, the cone would extract but the thermal sensors would stay at the place. It can put the sensors into bale without introducing air followed. Two schemes measuring temperature changes in punctured bale were designed. The temperature of planned locations in bale was monitored. It was detected that the temperature of the silage which was closer from the damaged cover rose sooner. Paired t test was done between the corresponding values from the upper and the lower within bale silage. The test results showed that two temperature rising processes of upper and lower had a significant difference. By temperature curve comparison of the same silage materials with different dry matter contents, it was fbtmd that tile temperature rising of silage with higher dry matter was faster. Furthermore, to measure the temperature field inside bale, a specific penetrometer was designed. It was fixed on the platform of measurement and controll
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2015年第4期194-199,共6页
Transactions of the Chinese Society for Agricultural Machinery
基金
中德合作科研资助项目(GZ888)
中央高校基本科研业务费专项资金资助项目
