中山站的雪     

崔洪宇 《中国测绘》2003,(5)

早晨睁开眼就见外面正在下雪,雪花随风飘舞,飞上房顶,飞上山冈,再被风吹下来,飘飘洒洒的,似乎上天也感觉到中山站的孤寂,派来飘飘的雪仙子给冬日中山站增添了一片亮色。今天的中山站又成了一个银装素裹的雪的世界。 走到外面的雪地里,雪花借着风  相似文献   

Adaptive Predictive Inverse Control of Offshore Jacket Platform Based on Rough Neural Network     

崔洪宇  赵德有  周平 《中国海洋工程》2009,23(2):185-198

The offshore jacket platform is a complex and time-varying nonlinear system,which can be excited of harmful vibration by external loads.It is difficult to obtain an ideal control performance for passive control methods or traditional active control methods based on accurate mathematic model.In this paper,an adaptive inverse control method is proposed on the basis of novel rough neural networks (RNN) to control the harmful vibration of the offshore jacket platform,and the offshore jacket platform model is established by dynamic stiffness matrix (DSM) method.Benefited from the nonlinear processing ability of the neural networks and data interpretation ability of the rough set theory,RNN is utilized to identify the predictive inverse model of the offshore jacket platform system.Then the identified model is used as the adaptive predictive inverse controller to control the harmful vibration caused by wave and wind loads,and to deal with the delay problem caused by signal transmission in the control process.The numerical results show that the constructed novel RNN has advantages such as clear structure,fast training speed and strong error-tolerance ability,and the proposed method based on RNN can effectively control the harmfid vibration of the offshore jacket platform.  相似文献