基于GRNN的船舶阻力预测

文章通过介绍广义回归神经网络(GRNN)的原理及其非线性拟合的能力,建立了基于GRNN的船舶阻力预测模型。本文将该模型运用到Taylor系列船舶剩余阻力预测中,得出预测结果。通过与实际阻力比较,得出预测阻力的相对误差在5%之内的百分比为93.98%,最后本文通过预测插值后的数据,得出相对误差在5%以内占85.38%。由此可以看出,GRNN预测船舶阻力有很高的精度和较强的泛化能力,为船舶阻力的预测提供了一种简便的预测方法。     

PERFORMANCE OF A KIND OF PERMANENT MAGNETIC SUCKERS USED IN WALL-CLIMBING ROBOTS

IntroductionWall- climbing robots with magnetic tracks arewidely used in the fields such as oil tank surfaceinspection,paints spraying shown in Fig.1 .Therobot attaches to the steel wall surface due to anumber of magnetic suckers on both tracks andis driven by the rear chain wheels. In order todecrease the robot's weight and improve its at-tractive ability on steel wall surface,the mag-netic suckers should be small in size,light inweight and powerful in attractive force.Theseare some of the i…     

RESEARCH ON THE DOF DISPOSITION AND MECHANISMS DESIGN OF HUMANOID ROBOT

IntroductionSome researchers[1～ 3] in Yugoslavia,Japan andAmerica have got many achievements in bipedrobot since the beginning of1 970 s.The bipedrobot can walk in static and dynamic gait and al-so can turn around and go up stairs.Recentlyhumanoid robot has become a hot researchingpoint[4,5 ] .Humanoid robot has body includinghead,neck,waist and hands.Biped robot is abasis of humanoid robot.Usually a humanoidrobot should have more than 2 0 DOF.All thetechnology problems in DOF planning,m…     

船员服务簿的现状和发展趋势

作者根据多年的船员管理经验，通过对现行船员服务簿存在问题的分析，提出更新船员服务簿的必要性和新证书的设计方案，以期加强船员证书的管理，保障船舶安全。     

便民河路透水混凝土慢道设计与施工方案

响应海绵城市建设号召,改善城市水环境,新建城市道路的绿道和人行道推荐采用透水铺装设计.透水性铺装能使雨水直接渗入地下,起到保护自然、维护生态平衡、缓解城市热岛效应的作用.透水铺装采用最多的是透水混凝土.透水混凝土的质量是透水路面建设成败的关键.