项目名称: 基于图像质量的不确定振动主动控制与模糊滤波器设计
项目编号: No.51275085
项目类型: 面上项目
立项/批准年度: 2013
项目学科: 机械、仪表工业
项目作者: 王永富
作者单位: 东北大学
项目金额: 80万元
中文摘要: 振动是一种复杂的、非线性的、具有不确定性的自然现象。振动在大多情况下是有害的,振动能产生附加动载荷从而降低系统性能,如何减小或消除振动对先进装备行业显得尤为重要。最近,振动主动控制技术正受到人们重视并被广泛应用于航空航天、仪器仪表、机械工程等领域。实际工程中,由于系统存在非线性动态、未建模动态、参数不确定性以及外部干扰等不确定因数,使得传统主动控制方法已不能满足精确控制要求。本项目为消除PET医疗装备中的不确定振动从而提高该设备的成像质量,在项目中提出了一种新的策略。也就是,基于图像质量的不确定振动主动控制与模糊滤波器设计。主要内容包括:1)PET设备中的不确定振动定性与定量分析;2)基于图像质量的不确定振动主动控制研究;3)不确定振动产生的图像噪声进一步后处理。通过本项目的实施,逐步建立起基于图像质量为目标的不确定振动主动控制及模糊滤波的理论体系,并将研究得出的理论应用于工程实际中。
中文关键词: 不确定振动;图像质量;主动控制;模糊滤波器;自适应
英文摘要: Vibration is a complex and nonlinear physical phenomenon with some uncertainties. Vibration is almost ubiquitous in real life. Sometimes vibration can be beneficial to us under special circumstances. Such as, vibration is utilized in nuclear magnetic resonance. However, generally, vibration generates additional dynamic loads to degrade the system performances. Thus, to improve the mechanical systems performance, it is necessary to reduce or eliminate vibration. Hence, it is meaningful to analysis the mechanism of vibration and offer effective control schemes for obtaining satisfactory performances. Recently, some active control schemes have been widely applied for precision instrumentation, aerospace, transportation systems and mechanical engineering. In practical vibration systems, traditional active control can't meet the demand of high precision control due to the existing of the nonlinear dynamics, unmodeled dynamics, parameter uncertainties and external disturbances. To eliminate the vibrations caused by some uncertainties and improve the image quality in PET medical device, this project proposes a new strategy, i.e, active control and fuzzy filter of uncertain vibration based on image quality. Main contents include: 1)Qualitative and quantitative analysis of uncertain vibration in PET device ;2)Active con
英文关键词: Uncertain vibration;Image quality;Active control;Fuzzy filter;Adaptive