针对铁路提速后大部分轻型墩桥梁横向车桥耦合振动幅值过大这一问题,提出采用多重调谐质量阻尼器MTMD(Multiple Tuned Mass Damper)对其进行控制。首先将被控桥墩简化为单自由度体系,建立了桥墩-MTMD系统力学模型和运动微分方程,全面系...针对铁路提速后大部分轻型墩桥梁横向车桥耦合振动幅值过大这一问题,提出采用多重调谐质量阻尼器MTMD(Multiple Tuned Mass Damper)对其进行控制。首先将被控桥墩简化为单自由度体系,建立了桥墩-MTMD系统力学模型和运动微分方程,全面系统地分析了MTMD各设计参数对动力放大系数的影响规律。经分析可知,MTMD的频带宽度、阻尼比、质量比、中心频率比和TMD的个数对结构振动控制有重要影响,应对其进行优化。在此基础上,以某特大桥的轻型墩为例设计MTMD,并对采用MTMD控制铁路轻型墩横向车桥耦合振动的效果进行了模拟分析,分析结果表明:MTMD能够有效地控制铁路轻型桥墩的横向振动,但减振效果与桥墩振动时程特征有关。展开更多
经典调谐质量减振系统往往需要较大的附加质量和相应的额外安装空间,为其实际使用带来不便。惯容系统是一种新型的高效振动控制装置,具有两端点惯性、表观质量增效和耗能增效等特性,其中表观质量增效特性可以实现轻量化结构振动控制。...经典调谐质量减振系统往往需要较大的附加质量和相应的额外安装空间,为其实际使用带来不便。惯容系统是一种新型的高效振动控制装置,具有两端点惯性、表观质量增效和耗能增效等特性,其中表观质量增效特性可以实现轻量化结构振动控制。该文聚焦具有轻量化控制特征的广义调谐质量惯容减振系统(Tuned mass inerter system,TMIS),陈述其基本原理与典型拓扑形式。考虑地震作用、风荷载与人致激励三种典型动力激励,提出适用于广义TMIS的基于性能需求的优化设计方法获得惯容系统的参数,在使结构满足性能目标的同时降低所需调谐质量的大小。通过与经典调谐质量减振系统进行对比,说明调谐质量惯容系统的轻量化减振控制优势,并通过典型案例及其动力响应分析加以验证。研究表明:TMIS是一种高效的结构振动控制装置,在多种典型灾害下均能有效实现结构减振控制的性能目标与减小调谐质量需求的轻量化目标,为结构振动控制问题的解决提供了便利的新选择。展开更多
As more and more composite materials are used in lightweight vehicle white bodies,self-pierce riveting(SPR)technology has attracted great attention.However,the existing riveting tools still have the disadvantages of l...As more and more composite materials are used in lightweight vehicle white bodies,self-pierce riveting(SPR)technology has attracted great attention.However,the existing riveting tools still have the disadvantages of low efficiency and flexibility.To improve these disadvantages and the riveting qualification rate,this paper improves the control scheme of the existing riveting tools,and proposes a novel controller design approach of the flexible servo riveting system based on the RBF network and SPR process.Firstly,this paper briefly introduces the working principle and SPR procedure of the servo riveting tool.Then a moving component force analysis is performed,which lays the foundation for the motion control.Secondly,the riveting quality inspection rules of traditional riveting tools are used for reference to plan the force-displacement curve autonomously.To control this process,the riveting force is fed back into the closed-loop control of the riveting tool and the riveting speed is computed based on the admittance control algorithm.Then,this paper adopts the permanent magnet synchronous motor(PMSM)as the power of riveting tool,and proposes an integral sliding mode control approach based on the improved reaching law and the radial basis function(RBF)network friction compensation for the PMSM speed control.Finally,the proposed control approach is simulated by Matlab,and is applied to the servo riveting system designed by our laboratory.The simulation and riveting results show the feasibility of the designed controller.展开更多
文摘针对铁路提速后大部分轻型墩桥梁横向车桥耦合振动幅值过大这一问题,提出采用多重调谐质量阻尼器MTMD(Multiple Tuned Mass Damper)对其进行控制。首先将被控桥墩简化为单自由度体系,建立了桥墩-MTMD系统力学模型和运动微分方程,全面系统地分析了MTMD各设计参数对动力放大系数的影响规律。经分析可知,MTMD的频带宽度、阻尼比、质量比、中心频率比和TMD的个数对结构振动控制有重要影响,应对其进行优化。在此基础上,以某特大桥的轻型墩为例设计MTMD,并对采用MTMD控制铁路轻型墩横向车桥耦合振动的效果进行了模拟分析,分析结果表明:MTMD能够有效地控制铁路轻型桥墩的横向振动,但减振效果与桥墩振动时程特征有关。
文摘经典调谐质量减振系统往往需要较大的附加质量和相应的额外安装空间,为其实际使用带来不便。惯容系统是一种新型的高效振动控制装置,具有两端点惯性、表观质量增效和耗能增效等特性,其中表观质量增效特性可以实现轻量化结构振动控制。该文聚焦具有轻量化控制特征的广义调谐质量惯容减振系统(Tuned mass inerter system,TMIS),陈述其基本原理与典型拓扑形式。考虑地震作用、风荷载与人致激励三种典型动力激励,提出适用于广义TMIS的基于性能需求的优化设计方法获得惯容系统的参数,在使结构满足性能目标的同时降低所需调谐质量的大小。通过与经典调谐质量减振系统进行对比,说明调谐质量惯容系统的轻量化减振控制优势,并通过典型案例及其动力响应分析加以验证。研究表明:TMIS是一种高效的结构振动控制装置,在多种典型灾害下均能有效实现结构减振控制的性能目标与减小调谐质量需求的轻量化目标,为结构振动控制问题的解决提供了便利的新选择。
基金The authors gratefully thank the research funding by the National Key Research and Development Plan of China(Grant No.2017YFB1303503)the research supported by the Key Research and Development Program of Shandong Province(Grant No.2019JZZY010441)+1 种基金the National Natural Science Foundation of China(Grant No.62103234)the project supported by the Natural Science Foundation of Shandong Province(Grant No.ZR2021QF027).
文摘As more and more composite materials are used in lightweight vehicle white bodies,self-pierce riveting(SPR)technology has attracted great attention.However,the existing riveting tools still have the disadvantages of low efficiency and flexibility.To improve these disadvantages and the riveting qualification rate,this paper improves the control scheme of the existing riveting tools,and proposes a novel controller design approach of the flexible servo riveting system based on the RBF network and SPR process.Firstly,this paper briefly introduces the working principle and SPR procedure of the servo riveting tool.Then a moving component force analysis is performed,which lays the foundation for the motion control.Secondly,the riveting quality inspection rules of traditional riveting tools are used for reference to plan the force-displacement curve autonomously.To control this process,the riveting force is fed back into the closed-loop control of the riveting tool and the riveting speed is computed based on the admittance control algorithm.Then,this paper adopts the permanent magnet synchronous motor(PMSM)as the power of riveting tool,and proposes an integral sliding mode control approach based on the improved reaching law and the radial basis function(RBF)network friction compensation for the PMSM speed control.Finally,the proposed control approach is simulated by Matlab,and is applied to the servo riveting system designed by our laboratory.The simulation and riveting results show the feasibility of the designed controller.
