多相旋流冲击振动动力学建模与突变分析方法  

Dynamic modeling and distortion analysis of shock vibration characterized by multi-phase vortex

作　　者：史纪林 李霖 谭大鹏[2] SHI Jilin;LI Lin;TAN Dapeng(Linyi City Highway Business Development Center-Junan County Center,Linyi 276000;College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310014)

机构地区：[1]临沂市公路事业发展中心莒南县中心,山东临沂276000 [2]浙江工业大学机械工程学院,浙江杭州310014

出　　处：《机械设计》2023年第8期95-104,共10页Journal of Machine Design

基　　金：浙江省自然科学基金项目(LQ23E050017);浙江省博士后科研项目择优资助项目(ZJ2022068)。

摘　　要：多相旋流在航空流控系统、化工匀浆搅拌、连铸过程浇注和核电冷却堆分离等工程领域广泛产生,其形成演变中多相耦合冲击振动动力学特性是具有高度非线性特征的复杂动力学问题。针对上述问题,文中提出了一种基于流固耦合的动力学模型和位移响应求解方法研究多相旋流冲击振动动力学行为。基于振动检测法原理,设计了多通道传感的旋流冲击振动观测平台,采用信号处理算法对流体冲击振动信号进行特征提取以判断旋流临界过渡状态,并提出一种基于小波的旋流非线性冲击振动突变识别方法。研究发现:旋流贯穿后高频段的振动幅值增大,小波变换dw4突变、高频能量结构的随机性脉冲分量和非线性阶跃等多重特征信息融合可用于多相流体耦合过渡状态的在线检测。Multi-phase vortex is widely used in the engineering fields such as aviation flow control system,chemical homogenate stirring,continuous casting process and separation of nuclear-power cooling reactor.The dynamic characteristics of multiphase coupling shock vibration during the evolving process are categorized into the complex dynamic problems with highly non-linear features.In this article,the fluid-solid coupling dynamic model and the displacement-response solution method are applied to explore the shock-vibration dynamic behaviors characterized by multi-phase vortex.The multi-channel sensing experimental platform is set up for shock vibration characterized by multi-phase vortex is set up based on the principle of vibration detection.The signal-processing algorithm is used for feature extraction of shock-vibration signals,so as to determine the vortex’s critical transition state,and the wavelet-based non-linear shock-vibration distortion recognition method is proposed.The results show that the vibration amplitude in high frequency band increases after the vortex penetration;dw4 distortion of wavelet transform,random pulse component of high-frequency energy structure and non-linear step can be used for online detection of the multi-phase fluid couplingin the transition state.

关 键 词：多相旋流 冲击振动 流固耦合 信号处理 

分 类 号：TB123[理学—工程力学]