煤矿智能化是煤炭行业高质量发展的技术支撑,关键岗位的机器人替代是实现煤炭少人化、无人化的高效开采的发展趋势。即时定位与地图构建(Simultaneous Localization and Mapping,SLAM)是煤矿机器人自主移动与导航的关键技术之一。煤矿...煤矿智能化是煤炭行业高质量发展的技术支撑,关键岗位的机器人替代是实现煤炭少人化、无人化的高效开采的发展趋势。即时定位与地图构建(Simultaneous Localization and Mapping,SLAM)是煤矿机器人自主移动与导航的关键技术之一。煤矿井下为典型非结构化环境,空间狭长局促,结构复杂多变,照明情况不均匀,对煤矿井下SLAM提出了严峻挑战。总结了煤矿井下地图构建研究现状,针对LeGO-LOAM算法的回环检测仍存在的不足,利用SegMatch算法改进LeGO-LOAM的回环检测模块,且使用ICP算法进行全局图优化,提出了一种融合LeGO-LOAM和SegMatch的改进算法,阐述了该算法的原理和实现步骤;开展了煤矿井下模拟场景试验,对比分析改进前后SLAM算法的建图效果以及精度,试验结果表明改进算法构建的地图回环效果更好,估计轨迹更平滑、精确;结合导航需求研究了二维占据栅格地图的构建方法,试验验证了该方法所构建的栅格地图精度,结果表明有效滤除动态障碍物等离群噪点后的栅格地图具有0.01 m的建图精度,且所需存储空间较点云地图降低了3个数量级。研究成果有助于煤矿井下非结构环境下SLAM和煤矿机器人实时定位和自主移动。展开更多
In this paper, the Cauchy problem for the inelastic Boltzmann equation with external force is considered in the case of initial data with infinite energy. More precisely, under the assumptions on the bicharacteristic ...In this paper, the Cauchy problem for the inelastic Boltzmann equation with external force is considered in the case of initial data with infinite energy. More precisely, under the assumptions on the bicharacteristic generated by external force, we prove the global existence of solution for small initial data compared to the local Maxwellian exp（-p｜x - v｜^2）, which has infinite mass and energy.展开更多
文摘煤矿智能化是煤炭行业高质量发展的技术支撑,关键岗位的机器人替代是实现煤炭少人化、无人化的高效开采的发展趋势。即时定位与地图构建(Simultaneous Localization and Mapping,SLAM)是煤矿机器人自主移动与导航的关键技术之一。煤矿井下为典型非结构化环境,空间狭长局促,结构复杂多变,照明情况不均匀,对煤矿井下SLAM提出了严峻挑战。总结了煤矿井下地图构建研究现状,针对LeGO-LOAM算法的回环检测仍存在的不足,利用SegMatch算法改进LeGO-LOAM的回环检测模块,且使用ICP算法进行全局图优化,提出了一种融合LeGO-LOAM和SegMatch的改进算法,阐述了该算法的原理和实现步骤;开展了煤矿井下模拟场景试验,对比分析改进前后SLAM算法的建图效果以及精度,试验结果表明改进算法构建的地图回环效果更好,估计轨迹更平滑、精确;结合导航需求研究了二维占据栅格地图的构建方法,试验验证了该方法所构建的栅格地图精度,结果表明有效滤除动态障碍物等离群噪点后的栅格地图具有0.01 m的建图精度,且所需存储空间较点云地图降低了3个数量级。研究成果有助于煤矿井下非结构环境下SLAM和煤矿机器人实时定位和自主移动。
基金supported by the Fundamental Research Funds for the Central Universities(2012TS008)the National Natural Science Foundation of China (11026054)
文摘In this paper, the Cauchy problem for the inelastic Boltzmann equation with external force is considered in the case of initial data with infinite energy. More precisely, under the assumptions on the bicharacteristic generated by external force, we prove the global existence of solution for small initial data compared to the local Maxwellian exp（-p｜x - v｜^2）, which has infinite mass and energy.
