Mill vibration is a common problem in rolling production,which directly affects the thickness accuracy of the strip and may even lead to strip fracture accidents in serious cases.The existing vibration prediction mode...Mill vibration is a common problem in rolling production,which directly affects the thickness accuracy of the strip and may even lead to strip fracture accidents in serious cases.The existing vibration prediction models do not consider the features contained in the data,resulting in limited improvement of model accuracy.To address these challenges,this paper proposes a multi-dimensional multi-modal cold rolling vibration time series prediction model(MDMMVPM)based on the deep fusion of multi-level networks.In the model,the long-term and short-term modal features of multi-dimensional data are considered,and the appropriate prediction algorithms are selected for different data features.Based on the established prediction model,the effects of tension and rolling force on mill vibration are analyzed.Taking the 5th stand of a cold mill in a steel mill as the research object,the innovative model is applied to predict the mill vibration for the first time.The experimental results show that the correlation coefficient(R^(2))of the model proposed in this paper is 92.5%,and the root-mean-square error(RMSE)is 0.0011,which significantly improves the modeling accuracy compared with the existing models.The proposed model is also suitable for the hot rolling process,which provides a new method for the prediction of strip rolling vibration.展开更多
惯容器是一种两端点加速度相关型控制元件,具有表观质量放大、耗能增效等特性,可更加高效、经济地进行结构振动控制,将惯容器表观质量增大的特性拓展到调谐减震装置中可实现轻量化振动控制。为研究高层结构上附加旋转惯质双调谐质量阻尼...惯容器是一种两端点加速度相关型控制元件,具有表观质量放大、耗能增效等特性,可更加高效、经济地进行结构振动控制,将惯容器表观质量增大的特性拓展到调谐减震装置中可实现轻量化振动控制。为研究高层结构上附加旋转惯质双调谐质量阻尼器(rotating inertia dual-tuned mass damper,RIDTMD)的轻量化振动控制效果,采用柔度法求逆的方法获得等效简化模型;通过结构模态分析、时程分析验证了等效模型的可靠性;建立附加RIDTMD多自由度结构的力学模型与运动方程;采取H_(2)优化和给定质量、阻尼参数的取值区间来确定RIDTMD的参数。在一个51层的框架核心筒结构上设计了RIDTMD,分析其在地震激励下的楼层位移、加速度和层间位移角等结构响应,频域与时程分析结果看,以调谐质量阻尼器(tuned mass damper,TMD)控制效果为目标的H_(2)优化设计可以使RIDTMD有着与TMD类似的振动控制效果,与无控结构相比,顶层峰值位移、均方根位移最大可分别降低18.0、32.9%,且RIDTMD的调谐质量比TMD减少30.0%。展开更多
基金Project(2023JH26-10100002)supported by the Liaoning Science and Technology Major Project,ChinaProjects(U21A20117,52074085)supported by the National Natural Science Foundation of China+1 种基金Project(2022JH2/101300008)supported by the Liaoning Applied Basic Research Program Project,ChinaProject(22567612H)supported by the Hebei Provincial Key Laboratory Performance Subsidy Project,China。
文摘Mill vibration is a common problem in rolling production,which directly affects the thickness accuracy of the strip and may even lead to strip fracture accidents in serious cases.The existing vibration prediction models do not consider the features contained in the data,resulting in limited improvement of model accuracy.To address these challenges,this paper proposes a multi-dimensional multi-modal cold rolling vibration time series prediction model(MDMMVPM)based on the deep fusion of multi-level networks.In the model,the long-term and short-term modal features of multi-dimensional data are considered,and the appropriate prediction algorithms are selected for different data features.Based on the established prediction model,the effects of tension and rolling force on mill vibration are analyzed.Taking the 5th stand of a cold mill in a steel mill as the research object,the innovative model is applied to predict the mill vibration for the first time.The experimental results show that the correlation coefficient(R^(2))of the model proposed in this paper is 92.5%,and the root-mean-square error(RMSE)is 0.0011,which significantly improves the modeling accuracy compared with the existing models.The proposed model is also suitable for the hot rolling process,which provides a new method for the prediction of strip rolling vibration.
文摘惯容器是一种两端点加速度相关型控制元件,具有表观质量放大、耗能增效等特性,可更加高效、经济地进行结构振动控制,将惯容器表观质量增大的特性拓展到调谐减震装置中可实现轻量化振动控制。为研究高层结构上附加旋转惯质双调谐质量阻尼器(rotating inertia dual-tuned mass damper,RIDTMD)的轻量化振动控制效果,采用柔度法求逆的方法获得等效简化模型;通过结构模态分析、时程分析验证了等效模型的可靠性;建立附加RIDTMD多自由度结构的力学模型与运动方程;采取H_(2)优化和给定质量、阻尼参数的取值区间来确定RIDTMD的参数。在一个51层的框架核心筒结构上设计了RIDTMD,分析其在地震激励下的楼层位移、加速度和层间位移角等结构响应,频域与时程分析结果看,以调谐质量阻尼器(tuned mass damper,TMD)控制效果为目标的H_(2)优化设计可以使RIDTMD有着与TMD类似的振动控制效果,与无控结构相比,顶层峰值位移、均方根位移最大可分别降低18.0、32.9%,且RIDTMD的调谐质量比TMD减少30.0%。
