摘要
多重调谐质量阻尼器(multiple tuned mass damper,简称MTMD)常被用于大跨楼板结构的竖向振动舒适度控制中。为改善目前工程中使用的MTMD对频率调谐敏感和难以调频的缺点,提出了一种自适应多重调谐质量阻尼器(adaptive-passive MTMD,简称AP-MTMD)减振系统。该系统中的每个自适应调谐质量阻尼器(tuned mass damper,简称TMD)均具有可变质量的构造,以及由加速度传感器、控制电路板和驱动装置组成的伺服控制系统。环境激励下,控制电路板采集置于主结构上加速度传感器的信号,通过基于小波变换(wavelet transformation,简称WT)的频率识别方法识别得主结构的主导自振频率,然后自发地启动驱动装置改变TMD的质量以调谐自身频率至所识别得到的主结构频率。以某大跨楼板结构为例进行分析,首先,通过现场实测修正有限元模型;其次,根据修正前的结构模型设计了一套自适应多重TMD系统,验证了其频率自适应调节的鲁棒性;最后,通过施加若干种人行荷载,对比了启动调节前后的MTMD系统对修正后模型的减振效果。结果表明,自适应多重TMD能够自发地调谐自身频率,提高对楼板结构人致振动的减振效果。
Multiple tuned mass damper(MTMD)are often used to control the vertical vibration of large-span floor structures.In order to improve their shortcoming of highly sensitive to frequency deviation and difficult to retune frequency,an adaptive-passive multiple TMD(AP-MTMD)system is proposed.Each adaptive-passive TMD in the system has a variable mass and a servo control system,which consists of an acceleration sensor,a control circuit board and a drive device.Under environmental excitation,the control circuit board collects the acceleration signal from the main structure through frequency identification method based on wavelet transformation(WT)to identify the structural first order frequency,and then starts the drive to change the quality of TMD to retune it to the primary structural frequency.A long-span floor structure is proposed as an example.By field measurement,the finite element model is updated,and then according to the original finite element model,an AP-MTMD system is designed,and the robustness of frequency adaptive adjustment is verified.Finally,by applying several pedestrian loads,vibration control effects of MTMD system before and after the adaptive adjustment on the updated model are compared.The results show that the AP-MTMD can automatically retune its frequency and improve the vibration control effect to the floor structure.
作者
王梁坤
施卫星
张全伍
周颖
WANG Liangkun;SHI Weixing;ZHANG Quanwu;ZHOU Ying(Department of Disaster Mitigation for Structures,Tongji University Shanghai,200092,China;Shanghai RB Vibration Science and Technology Co.,Ltd.Shanghai,200092,China)
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2020年第3期578-584,630,共8页
Journal of Vibration,Measurement & Diagnosis
基金
国家重点研发计划资助项目(2016YFC0701101)
国家自然科学基金资助项目(51678449)。
关键词
楼板结构
自适应多重调谐质量阻尼器
小波变换
现场实测
响应评估
floor structure
adaptive-passive multiple tuned mass damper
wavelet transformation
in-situ test
response
