Motion characteristics of novel floating foundation for offshore wind turbine

A novel floating foundation to support the NREL offshore 5 MW wind turbine was designed conceptually by combining the characteristics of barge and Spar. The main focus was structural design and hydrodynamic modelling. Based on this novel floating foundation, the hydrodynamic performance was investigated in the frequency domain and time domain by using the wave analysis software HydroD and DeepC from Det Norske Veritas. The frequency domain analysis was conducted to investigate the effects of the incident wave angle and water depth. The time-domain analysis was carried out to evaluate the response of the floating foundation under a selected operational condition. The hydrodynamic performances of this floating foundation with respect to time series and response spectra were also investigated in this study.     

高职高专院校高等数学教学模式新探

分析高职高专院校在高等数学学科教学中存在的问题及解决的思路,探索新的教学模式,提出在高等数学的教学中尝试使用判例法教学,发挥多媒体信息技术的优势。     

高职高专《高等数学》教学方法浅谈

高等数学是各理工科高等院校的一门理论难、逻辑性强的基础课,一直以来是许多大学生感到惧怕的课程。针对高职高专院校的课时少、任务重的教学特点,本文探讨了如何改进高等数学的教学方法,提高教学质量的几种途径。     

基于旅游领域本体的语义排序研究

本文分析了如何利用领域本体来改善实例与文档的相关度,提出了语法相关度、语义相关度计算方法,还提出了将基于关键字与语义的排序算法相结合的观点.     

计算悬空管线固有频率的新方法

长输管线在石油工程中大量使用 .穿河段管线由于河水的冲刷变得悬空 ,如果管线附近的涡泻频率接近管线的固有频率 ,将引起悬空管线的共振 ,并且导致管线的破坏 .本文将悬空管线视为弹性基础上的半无限长梁 ,建立了悬空段管线和埋入土中管线的偏微分振动方程 ,提出了计算管线固有频率的迭代计算方法 ,实例计算结果同现场测试结果基本一致 .     

N维球体积新解

简洁证明了n维球体积与表面积之间的微分关系,证明了n维球体积与其半径n次幂的正比例关系,并结合简单的微元法推导出了n维球的体积公式。     

数学思想在高职高专教学中的可行性研究

数学是一门理论难、逻辑强、应用广的基础课。对于高职高专院校课时少、任务重的教学特点,数学的教学难度更大。本文对高职高专数学教学中融入数学思想进行了可行性研究。     

Vibration Control Induced by Ice of a Jacket Platform

Thevibrationinducedbyiceisanimportantfactorofdamageforjacketplatforms ,sotheiceloadshavebeenthecontrolloadforjacketplatformsintheBohaiBay[1] .Toreducedamageinducedbytheiceforce ,theloadsstandardofjacketplatformshasbeenimproved .Infact ,thestrengthofjacketplatformsagainststaticiceforceismeteasily .But,thesafetyproblemoftheplatformaf fectedbyboththebehaviorsofself excitedandcouplingissolvedbyothertechnologysolutions[2— 3] .Xuetalde signedasetofdevicesforreducingvibrationofthejacketplatforminth…     

浅释IPv6

本文主要介绍IPv6的地址格式、地址类型、地址配置,并阐述了IPv6提供的安全技术及IPv4到IPv6的过渡机制。     

单位脉冲函数δ(t)及其性质

本文给出了单位脉冲函数的定义及若干性质,并结合傅里叶变换给出了一些性质的应用,对工程技术中单位脉冲函数的应用具有指导意义.